Mitsubishi CAC1-A01D2 Relay Instruction Manual PDF

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Mitsubishi CAC1-A01D2 Relay Instruction Manual PDF

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Year 2012

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Summary of Content for Mitsubishi CAC1-A01D2 Relay Instruction Manual PDF

Page 1

1 JEP0-IL9432-F

Request Ensure that this Instruction Manual is delivered to

the end users and the maintenance manager.

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JEP0-IL9432 2

Safety section

This Safety section should be read before starting any work on the relay. Be sure to read the instruction manuals and other related documents prior to commencing any work on the relay in order to maintain them in a safe condition. Be sure to be familiar with the knowledge, safety information and all caution items of the product prior to use.

CAUTION Caution means that failure to un-observe safety information, incorrect use, or improper use may endanger personnel and equipment and cause personnel injury or physical damage.

Items as classified to the caution may become to occur more sever results according to the circumstance. Therefore, all items described in the safety section are important and to be respected without fail.

CAUTION

1. Items concerning transportation (1) Be sure the equipment to be kept in normal direction (2) Avoid the bumps, shock, and vibration, otherwise the product performance /life might be unfavorably

affected. 2. Items concerning storage

(1) Environment shall be as below, otherwise the product performance/life might be unfavorably affected. -Ambient temperature: -20+60 (with no condensation nor freezing) -Relative humidity: 30~80% average of a day -Altitude: Less than 2000m -Avoid applying unusual shock, vibration or leaning or magnetic field -Not expose to harmful smoke, gas, salty air, water, vapor, dust, powder, explosive material or wind, rain.

3. Items concerning mounting/wiring work (1) Mounting and wiring work should be done correctly.

Otherwise, damage, burning or erroneous operation might occur. (2) Screw terminal should be tightened securely.

Otherwise, damage and burning might occur. (3) Grounding should be done correctly in case it is required.

Otherwise, electric shock, damage, burning or erroneous operation might occur. (4) Wiring should be done without mistake especially observing the correct polarity. Otherwise, damage, burning or erroneous operation might occur. (5) Wiring should be done without mistake especially observing the phase ordering. Otherwise, damage, or erroneous operation might occur. (6) Auxiliary power source, measuring transformer and power source which have enough capacity for

correct operation of product should be used. Otherwise, an erroneous operation might occur.

(7) Be sure to restore the front cover, terminal cover, protection cover, etc to the original position, which have been removed during the mounting/ wiring work. Otherwise, electrical shock might occur at the time of checking.

(8) Connection should be done correctly using designated and right connectors. Otherwise, damage or burning might occur.

(9) Fully insert the sub unit into the case until you can hear a click while pressing the handles located on both sides of the sub unit front face. Otherwise, incomplete inserting the sub unit might only establish a poor contact with the terminals located on the back side of unit, which might cause erroneous operation or heating.

4. Concerning equipment operation and settings (1) Operational condition should be as below.

Otherwise, the product performance/life might be unfavorably affected. -Deviation of auxiliary power: within +10%~-15% of rated voltage -Deviation of frequency: within 5% of rated frequency -Ambient temperature: 0+40 (-10+50 is permissible during couples of hour per day, with no condensation nor freezing)

-Relative humidity: 30~80% average of a day -Altitude: Less than 2000m -Avoid to be exposed to unusual shock, vibration, leaning or magnetic field -Not expose to harmful smoke, gas, salty air, water, vapor, dust, powder, explosive material, wind or rain.

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(2) Qualified personnel may work on or operate this product, otherwise, the product performance/life might be unfavorably affected and/or burning or erroneous operation might occur.

(3) Be sure to read and understand the instruction manuals and other related documents prior to commencing operation and maintenance work on the product. Otherwise, electrical shock, injury, damage, or erroneous operation might occur.

(4) While energizing product, be sure not to remove any unit or parts without permissible one. Otherwise, damage, or erroneous operation might occur.

(5) While energizing product, be sure to make short circuit of current transformer secondary circuits before setting change or drawing out the sub unit. Otherwise, secondary circuit of live current transformer might be opened and damage or burning might occur due to the high level voltage.

(6) While energizing product, be sure to open trip lock terminal before setting change or drawing out the internal unit of product. Otherwise, erroneous operation might occur.

(7) Be sure to use the product within rated voltage and current. Otherwise, damage or mal-operation might be occurred.

(8) While energizing product, be sure not to clean up the product. Only wiping a stain on the front cover of product with a damp waste might be

allowable. (Be sure to wring hardly the water out of the waste.) 5. Items concerning maintenance and checking

(1) Be sure that only qualified personnel might work on or operate this product. Otherwise, electrical shock, injury, damage, or erroneous operation might occur.

(2) Be sure to read and understand the instruction manuals and other related documents prior to commencing operation and maintenance work on the product. Otherwise, electrical shock, injury, damage, or erroneous operation might occur.

(3) In case of replacing the parts, be sure to use the ones of same type, rating and specifications, etc. If impossible to use above parts, be sure to contact the sales office or distributor nearest you. Otherwise, damage or burning might occur.

(4) Testing shall be done with the following conditions. -Ambient temperature: 2010 -Relative humidity: Less than 90% -Magnetic field: Less than 80A/m -Atmospheric pressure: 86~106103 Pa -Installation angle: Normal direction2 -Deviation of frequency: within 1% of nominal frequency -Wave form(in case of AC): Distortion factor less than 2%

(Distortion factor=100%effective value of harmonics/effective value of fundamental) -Ripple (in case of DC): Ripple factor less than 3% (Ripple factor=100%(max-min)/average of DC) -Deviation of auxiliary power: within 2% of nominal voltage -Be sure not to inject the voltage or current beyond the overload immunity. Otherwise, damage or burning might occur. -Be careful not to touch the energized parts. Otherwise, the electric shock might occur. 6. Items concerning modification and/or repair work

Be sure to ask any modification and/ or repair work for product to the sales office or distributor nearest you.

Unless otherwise, any incidents occurred with modification or repair works (including software) done by any other entity than MITSUBIHI ELECTRIC CORPORATION shall be out of scope on warranty covered by MITSUBISHI ELECTRIC CORPORATION.

7. Items concerning disposal Particular regulations within the country of operation shall be applied to the disposal.

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- Introduction -

Thank for your purchasing MITSUBISHI ELECTRIC MELPRO TM D Series Digital Protection Relay.

Please read this manual carefully to be familiar with the functions and performances enough to use the

product properly.

It is necessary to forward end users this instruction manual.

For operation of the product, this manual should be used in conjunction with the following materials: Title of document Document No.

MELPRO D Series Protection Relay General Operation Manual JEP0-IL9416

When the protection relay is used together with a communication card, use the following documents too:

(For CC-Link) Title of document Document No.

MELPRO D Series Protection Relay CC-COM Communication Card (CC-Link) Operation Manual (General information) JEP0-IL9517

MELPRO D Series Protection Relay CC-COM Communication Card (CC-Link) Operation Manual (Model-specific information) JEP0-IL9418

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CONTENTS 1 Features.......................................................................................................................................................6

1.1 General description ......................................................................................................................6 1.2 Features .......................................................................................................................................6

2 Ratings and specifications ...........................................................................................................................8 2.1 General information ......................................................................................................................8 2.2 Protection element........................................................................................................................9 2.3 Measurement elements..............................................................................................................10

3 Characteristics ...........................................................................................................................................11 3.1 Protective elements ....................................................................................................................11 3.2 Common technical data..............................................................................................................14

4 Functions ...................................................................................................................................................15 4.1 Protection ...................................................................................................................................15 4.2 Setting.........................................................................................................................................20 4.3 Measurement..............................................................................................................................25 4.4 Self-diagnosis .............................................................................................................................26 4.5 Communication (option) .............................................................................................................28

5 Configuration..............................................................................................................................................30 5.1 Internal configuration..................................................................................................................30 5.2 External connection ....................................................................................................................33

6 Handling.....................................................................................................................................................41 6.1 Unpacking...................................................................................................................................41 6.2 Transportation and storage ........................................................................................................41 6.3 Appearance and how to pull sub unit out ...................................................................................41 6.4 How to use front control panel....................................................................................................46

7 Mounting ....................................................................................................................................................56 7.1 Mounting dimension ...................................................................................................................56 7.2 Standard operating environment ................................................................................................56

8 Test ............................................................................................................................................................57 8.1 Appearance inspection...............................................................................................................57 8.2 Characteristic test.......................................................................................................................58

9 Maintenance ..............................................................................................................................................61 9.1 Daily inspection ..........................................................................................................................61 9.2 Periodical inspection...................................................................................................................61

10 Ordering .....................................................................................................................................................62 11 Guarantee ..................................................................................................................................................62

11.1 Guarantee period........................................................................................................................62 11.2 Scope of guarantee ....................................................................................................................62 11.3 Exclusion of loss in opportunity and secondary loss from warranty liability...............................63 11.4 Applications of products .............................................................................................................63 11.5 Onerous repair term after discontinuation of product.................................................................64 11.6 Changes in product specification ...............................................................................................64 11.7 Scope of service .........................................................................................................................64

12 Improvement of protection function ...........................................................................................................64

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1 Features 1.1 General description

Mitsubishi Electric MELPRO-D Series is a digital protection relay product with a microprocessor for

protecting high/extra-high-voltage electric power system.

With its improved functions, including operation support using the advanced communication networks,

data saving at the power system faults and power system voltage/current measurement, this series of

protection relay will allow stable and effective control and monitoring of electric power systems as well as

provide high-reliable protection.

1.2 Features

(1) High-reliable protection

CAC1-A01D2 relay contains a 3-phase biased differential protection element and a 3-phase

differential overcurrent protection element. Just this one relay is enough to protect a transformer. In

addition, it also contains a 3-phase second-harmonic blocking element in order to avoid incorrect

operation caused by inrush current.

(2) Communication Network (With the addition of optional communication card)

- With an open field bus system, the relays can be used to build a high-speed, high-performance

network system. In addition, the relays multi-drop serial wiring reduces the amount of labor

required for communication wiring.

- Monitoring of measurement values, operation status, as well as setting changes, etc., can be

performed from a remote location.

- In consideration of future network system variations and compatibility with communication

networks, communication features are mounted in the relay using a replaceable card.

(3) Measurement & Recording Functions

- Real time monitor of relay input data

The relay can measure steady state relay input values, supporting energy management.

- Fault Data Monitor

When a fault occurs, the relay saves the past 5 effective input values, and waveform data and 2nd

harmonic component ratio to assist with fault analysis.

(4) Programmable Output Configuration

The operating output contacts (DO) can be set by combining the outputs of the protection relay

element using OR logic, thereby simplifying sequence design.

(5) High Accurate Digital Computation

The digital computation using high-speed sampling minimizes the effect of high harmonics, etc., and

results in highly accurate protection.

(6) Self-diagnosis

The relay continuously monitors electronic circuits from input to output so that it can detect internal

failure before that failure causes damage on the power system, thereby improving reliability.

(7) Easy Replacement

The dimensions of the panel cutout are the same as the prior MULTICAP series. Changing from an

existing relay type to this new type is easy.

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(8) Easy Maintenance

The relays are adopted as draw-out unit mechanisms with automatic CT shorting at drawing, thereby

making maintenance easy.

(9) Easy wiring check

It is possible to carry out forced operation of the output contacts individually. This will allow an easy

wiring check.

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2 Ratings and specifications 2.1 General information

Type name CAC1-A01D2 Without direct communication port 302PMB 303PMB 326PMB 327PMB

Style With direct communication port 561PMB 562PMB 563PMB 564PMB

Biased differential element 3 2ndharmonic blocking element 3 Protection

Differential overcurrent element 3 Elements

Measurement Restraining current, Differential current, 2f harmonic component ratio Frequency 50 Hz 60 Hz 50 Hz 60 Hz

Phase current 5 A *20 1 A *20 Voltage Common use for 100 ~ 220VDC / 100 ~ 220VAC Ratings

Auxiliary power supply *21 Operative

range DC : 85 ~ 242 V (Range of 80 ~ 286VDC is allowable temporarily.) AC : 85 ~ 242 V (Range of 80 ~ 253VAC is allowable temporarily.)

RUN Indicate the result of self-diagnosis. The lamp is lit for normal conditions and off for abnormal.

Unit Indicate the unit symbol for measurements.

Item No., Item data Display measurement, status, setting and option data selected with an item number.

Display

Communication With a communication card installed: the lamp is lit for normal conditions, blinking during communication and off for abnormal. With a communication card not installed: the lamp is off.

Self-diagnosis Monitor the electronic circuit and internal power supply to output signal to the RUN LED and self-diagnosis output (ALARM).

For trip 2 make contacts: X4 and X5 (programmable output) For signaling 4 make contacts: X0 to X3 (programmable output) Configurations

For self-diagnosis output

1 break contact: Y (open for normal result of self-diagnosis with power on)

Make 110VDC, 15A, 0.5 s (L/R = 0 s) 220VDC, 10A, 0.5 s (L/R = 0 s)

Break 110VDC, 0.3A (L/R 40 ms) 220VDC, 0.15A (L/R 40 ms)

For trip

Carry 1.5 A , continuously Make and break 500 VA (cos= 0.4), 60W (L/R = 0.007 s) Max. current 5 A

Output contacts

Capacity

For signaling and self-diagnosis

output Max. voltage 380VAC, 125VDC Direct communication port Standard equipment (PC software for direct communication) : option

Communication Remote communication card Option for CC-Link

Phase current circuit 0.5 VA or less (with rated current)

Burden Auxiliary power supply circuit

100VDC : approx. 7W (approx. 9W including communication card) 100VAC : approx. 25VA (approx. 27VA including communication card) 220VDC : approx. 9W (approx. 11W including communication card) 220VAC : approx. 30VA (approx. 32VA including communication card)

Mass Net weight of relay unit : approx. 3.8 kg Including case : approx. 5.0 kg

Case/cover Size : D2 type *20 Permissible continuous current value is 8.7A(for 5A rating) and 1.7A (for 1A rating). *21 When an uninterruptible AC power source is not provided in your system for the auxiliary supply voltage, use the

type B-T1 backup power supply or commercially available uninterruptible power supply (UPS). Type B-T1 back up power supply unit can be applied for DASH series protection relay with 100V200V auxiliary power supply voltage rating only. In addition, the power supply duration of the type B-T1 back up power supply is confirmed about 2 seconds in combination with one MELPRO-D series relay. Therefore, in the case that the required power supply duration after power source loss exceeds 2 seconds, please use a suitable commercial uninterruptible power supply. When the power supply back up for the control power supply of a circuit breaker is required, it is necessary to prepare the backup power supply different from the type B-T1 back up power supply.

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2.2 Protection element Without direct communication port 302PMB 303PMB 326PMB 327PMB Style With direct communication port 561PMB 562PMB 563PMB 564PMB

Matching tap 1 IT1(IT)

2.2 ~ 12.5A (0.1A step)

0.44 ~ 2.5A (0.02A step)

Matching tap 2 IT2(IT)

2.212.5A (0.1A step)

0.44 ~ 2.5A (0.02A step)

Operation current IT(LOCK203040%) Bias

(=Differential current/Restraining

current)

203040-%

Biased differential protection

DIF test *22 oFF(When running)-on(When testing)

2nd harmonic blocking

2nd harmonic blocking ratio

2nd harmonic component (If2)/ fundamental component (If1)=10~25%

(5% step)

Settings

Differential overcurrent Operation current IT(5~12) (1 step)

Forced operation Forced operation is available for any trip or signaling contacts individually.

Operation indication When the relay operates, the operation indicator LED (red) will come on. And when 2nd harmonic wave is found out, the detection LED (yellow) comes on.

*22 When DIF test is set on, the single phase relay test can be carried out with the differential current monitor blocked.

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2.3 Measurement elements Without direct communication port 302PMB 303PMB 326PMB 327PMB Style With direct communication port 561PMB 562PMB 563PMB 564PMB

Measurement Effective current in stationary state [multiplying factor against IT] Range * 0~9999[%] Real time Update Approx. 200ms Measurement Max. effective current [multiplying factor against IT] Max.

records Range * 0~9999[%] Measurement Effective current when tripping [multiplying factor against IT]

Restraining current

Fault records Range * 0~9999[%]

Measurement Effective current at stationary state [multiplying factor against IT] Range * 0~9999[%] Real time Update Approx. 200ms Measurement Max. effective current [multiplying factor against IT] Max.

records Range * 0~9999[%] Measurement Effective current when tripping [multiplying factor against IT]

Differential current

Fault records Range * 0~9999[%]

Measurement If2/ If1 at stationary state

Range * 0~9999[%] Real time Update Approx. 200ms Measurement If2/ If1 when tripping

Display

2f component

ratio Fault records Range * 0~9999[%]

* The form of display depends on value range as shown in the tables below. When displaying value exceeds the maximum of the range, display will be blinked with the maximum value.

Display range Display form Display range Display form Display range Display form Display range Display form 0~9[%] [%] 10~99[%] [%] 100~999[%] [%] 1000~9999[%] [%]

*When a communication card is connected, wave form data in the case of the power system fault can be monitored. (See the section 4 Function).

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3 Characteristics

Common conditions

(1) Rated frequency:1%

(2) Aux. supply voltage : Rated voltage 2% (3) Ambient temperature: 20C10C

The conditions shown on the left should be applied unless otherwise specified.

3.1 Protective elements Items Conditions Guaranteed performance

Biased differential element Iop=ITOperation current (%) Operation value Differential overcurrent

element Iop=ITDifferential overcurrent Within 5% of Iop

Biased differential element Iop=ITOperation current (%) Reset value Differential overcurrent

element Iop=

ITDifferential overcurrent

Operation value95%or more

Biased differential element 0[A] Iop300% 50ms or less Operation time Differential overcurrent

element 0[A] Iop300% 40ms or less

Biased differential element Iop300% 0[A] Reset time Differential overcurrent

element Iop300% 0[A] Within 20025ms

Biased differential characteristics

Matching tap IT1 = IT2 = IT At minimum matching tap setting I2 = IT 200%

| I1 I2 | I1 or I2*

Bias=

(* Whichever is greater)

I1 I2

When = 20% setting = 15%25%

When = 30% setting = 25%35%

When = 40% setting = 35%45%

Both lead and lag operation phase angle between I1 and I2 are shown below: Nominal bias ratio

20 [%] 168.55

30 [%] 162.75

Phase characteristics

At minimum matching tap setting | I1 | = | I2 |

=IT 200

Internal fault side

Through fault side 40 [%] 156.95

At minimum matching tap setting IDC = IT 80% *Refer to the 8.2.2 characteristic test circuit

Setting value : 10% IAC = 254330% () Setting value : 15% IAC = 137188% () Setting value : 20% IAC = 81119% () Setting value : 25% IAC = 4777% () :Range to be possible

to block

2nd harmonic blocking characteristics

In case of 2nd harmonic current superposing method If1=IT300%

2nd restraining ratio: Setting value10%

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Items Conditions Guaranteed performance Operation value

Reset value

(1)Rated frequency (2) Rated deviation range of Aux,

supply voltage

5% or less of operation/resent value at rating aux, voltage.

Operation time

Reset time

(1)Rated frequency (2)Rated deviation range of Aux,

supply voltage

5% ms or less at rating aux, voltage.

Biased differential characteristics

(1)Rated frequency (2)Rated deviation range of Aux,

supply voltage (3)At minimum matching tap and

I2I1200%

In response to the at rating aux, voltage, When = 20%

= 15%25 When = 30%

= 25%35 When = 40%

= 35%45

Auxiliary supply voltage deviation

characteristic

Phase characteristics

(1)Rated frequency (2)Rated deviation range of Aux,

supply voltage (3)I1=I2= IT200%

5% or less of phase angle at rating aux, voltage.

Operation value

Reset value

(1)Rated aux, voltage (2)Frequency deviation 5% of rated frequency

5% or less of the value at the rated frequency

Operation time

Reset time

(1) Rated aux, voltage (2)Frequency deviation

5% of rated frequency

5 on less of at the rated frequency

Biased differential characteristics

(1)Rated aux, supply voltage (2)At minimum matching tap and

I2IT200% (3)Frequency deviation5% of rated

frequency

5 on less of at the rated frequency

Frequency characteristics

Phase characteristics

(1)Rated aux, supply voltage (2)I1=I2= IT200% (3)Frequency deviation5% of rated

frequency

5% or less of phase angle at the rated frequency.

2020 5% or less of the value at 20

Operation value Reset value

(1)Rated frequency (2)Rated aux supply

voltage 2030 10% or less of the value at 20

2020 Operation time

Reset time

(1)Rated frequency (2)Rated aux supply

voltage 2030

5 ms or less of the value at 20

2020 5 or less of the value at 20

Biased differential characteristics

(1)Rated frequency (2)Rated aux supply

voltage (3)I2IT200%

2030 10 or less of the value at 20

5 or less of the value at 20

Temperature characteristics

Phase characteristics

(1)Rated aux, supply voltage (2)I1=I2= IT200% (3)Frequency deviation5% of rated

frequency 10 or less of the value at 20

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Items Conditions Guaranteed performance

Relative humidity characteristics

Temperature 40 Relative humidity 95RH

no condensed Testing duration 4 days

Operation value 5% or less of the value at normal condition Operation time 10% or less of the value at normal condition Phase angle 5or less of the value at normal condition

*31 Mitsubishi electric corporation adopt the scheme that maximum current is applied for restrain current. Therefore, biased differential characteristics is calculated such as the differential current divided by the

maximum current. On the other hand, biased differential characteristics calculated by outflow current base scheme is

described in the following table. Differential currentRestrain currentoutflow current

Ratio Inflow Flow-out

Differential current

Ratio

(Adopted scheme by Mitsubishi electric corporation.) (outflow current base scheme)

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3.2 Common technical data ITEM DESCRIPTION CONDITION STANDARD

Ambient operating temperature

-10C to +55C IEC60255-6

Ambient storage and transport temperature

-25C to +70C IEC60255-6 Environment

Damp heat +40C, 95%RH, 4 days IEC60068-2-3 VT 1.15Vn, 3h Thermal

withstand CT 40In, 1s

Circuit of 60V or below 500VAC, 1min.

Circuit of more than 60V and 500v or below

2000VAC 1min.

1) Between each circuit and the exposed conductive parts, the terminals of each independent circuit being connected together

2) Between independent circuits, the terminals of each independent circuit being connected together

Dielectric test

Open contact 1000VAC, 1min. Between open contact poles

IEC60255-5

Impulse voltage test 5kV, 1.2s/50s

1) Between each circuit and the exposed conductive parts, the terminals of each independent circuit being connected together

2) Between independent circuits, the terminals of each independent circuit being connected together

IEC60255-5

Common mode 2.5kV peak, 1MHz with 200 source impedance for 2s

Between independent circuits, and between independent circuit and earth

High-frequency disturbance test

Differential mode 1.0kV peak, 1MHz with 200 source impedance for 2s

Across terminals of the same circuit

IEC60255-22-1 class 3

8kV Contact discharge Electrostatic discharge test

15kV Air discharge IEC60255-22-2 Class 4

Radiated electromagnetic field disturbance test

68 to 87Mhz 146 to 174MHz 420 to 470MHz

IEC60255-22-3 class 3

Fast transient disturbance test 2.0kV, 5ns/50ns, 1min IEC60255-22-4

Vibration test Refer to class 1 IEC60255-21-1 Class 1

Shock response Refer to class 2 IEC60255-21-2 Class 2

Shock withstand Refer to class 1 IEC60255-21-2 Class 1

Bump Refer to class 1 IEC60255-21-2 Class 1

Enclosure protection IP51 IEC60529

Vn: Rated voltage, In: Rated current

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4 Functions 4.1 Protection

4.1.1 Protection elements

Fig. 4.1 shows internal function block diagram of Biased differential element and differential overcurrent

element.

In this relay, a differential element with bias blocking, a 2nd harmonic blocking element (2f blocking

element) and a differential overcurrent element are provided for each phase protection of 2-winding

transformer. Fig. 4.2 shows the biased differential characteristic. The relay output is blocked by the

operation of the 2nd harmonic blocking element which is designed to detect the exciting inrush current

generated at energizing the transformer. The internal or external fault can be distinguished by differential

element with bias. And the internal heavy fault can be protected quickly by differential overcurrent element

with instantaneous operation characteristic.

I2A Biased differential

characteristic

Level distinguish

87-A operating signal

Effective value

Matching tap

2f Matching tap

Max. value

2f blocking element

Level distinguish 2f-Block-A operating signal

Effective value

Biased differential

element Effective

value

Effective value

Matching tap

Minimum operation value

Level distinguish

87H-A

operating signal

Differential overcurrent

element Level distinguishI1A

Biased differential

element

Id/I>-A

Id>-A

2fB-A

Figure 4.1 Biased differential elementDifferential overcurrent element Internal function diagram

(Only one phase expressed)

(1) Matching tap

The CT ratio and CT connection are designed to compensate the current difference between HV side and

LV side as a consequence of the transformer ratio and winding connection so that current of HV side and LV

side are become to almost same value.

To obtain perfectly same current value of HV side and LV side, matching tap installed in the relay can be

applied.

The matching tap should be set according to that the current value calculated by the rated transformer operation currentrated input current of relay/setting of matching tap will be quite closer value of rated input

current of relay.

(2) Biased differential

To detect the internal faults of transformer, current differential scheme can be applied in principle.

However, CT error in the condition of large current has to be considered in the actual application.

Then, biased differential scheme in which internal faults will be detected by the ratio between differential

current and maximum current in circuit, is applied.

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The definition of biased differential in the relay is as follows. Biased differential = Differential current/Restraining current100%

Differential current: HV side currentLV side current

(The above equation is based on that generally the HV current is inflow and

the LV current is outflow in the normal condition of transformer.)

Restraining current: | HV current | or | LV current | whichever is greater.

The following is the actual calculation executed in the relay. (I1In/IT1I2In/IT2)

(I1In/IT1 or I2In/IT2 whichever is greater) 100

Minimum operating value (I1In/IT1I2In/IT2)In(Setting value of operation current/100)

For example, minimum operating value at HV side Iop can be derived with I2=0 as below. I1In/(In/IT1)(setting of operation current/100) I1IT1(setting of operation current/100)

(3) At the time of internal fault

At the time of internal fault, the differential current IDIF overcomes the restraining current IRES, so that the

biased differential element operates with high-speed. Moreover, at the time of an internal fault with heavy

fault current, the differential overcurrent element can operate instantaneously.

=40% 30%

20%

I2 IDF

IRES

IDIF

IMIN-OP

5 4 3 2 1 0

Multiples of tap value current IT

Operating zone

No operating zone

current : Rated In e)tting valung tap (Se : Matchi, II

urrentecondary c : CT s, II )ting value40% ) (Set20%, 30%, : Bias (

g value) ) (Settin current I tap valuef matching30%, 40% ont ( 20%, ting curre : OperaI

) I I

, I I I

rent of ILarger curcurrent ( ng Restraini :I

) I I

I I I

Icurrent ( fferential : DiI

T2T1

TMin. op

n 2

n 1RES

n 2

n 1DIF

Figure 4.2 Biased differential characteristic

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(4) At the time of external fault

At the time of external fault, the relay does not operate, because no differential current is produced if

Ct error is negligible. Moreover, even if CT saturation may arise due to a heavy external fault, the

relay does not make any unwanted operation owing to the ratio differential characteristics.

(5) At the time of exciting inrush

In the exciting inrush current, a large quantity of 2nd harmonic component is included but in the

internal fault current it is not so much included as shown on the below table. This difference is utilized

and 2nd harmonic blocking principle is adopted for this relay so that unwanted operation due to the

transformer inrush is prevented. Once the 2nd harmonic component is detected at the operation

status of the biased differential element, the operation indication LED (yellow) comes on.

When 2nd harmonic component includes more than the setting value of 2nd blocking ratio, it operates

and prevents the operation of biased differential element. So the unwanted operation caused by

exciting inrush current can be prevented. There are two methods to lock the biased differential

element by the operation of the 2nd harmonic blocking element; one is the All Phase OR Lock method

(Once inrush is detected in any phase, all phases will be locked) and the other is the Segregated

Phase Lock method (only the detected phase is locked). The two methods are switched automatically

according to the following conditions:

a. The biased differential element is operating

b. The load terminal current* is nearly equal to 0

* I, or I2 whichever smaller

Only in the case when above two conditions are met, the All Phase OR Lock method is adopted.

Otherwise, the Segregated Phase Lock method is adopted. So it is possible to prevent the unwanted

operation caused by exciting inrush current when power is switched on.

Trip command

Biased differential element

C phase

2nd harmonic bloking

Load terminal current Is0

A phase

And gate

OR gate 2nd harmonic bloking

Biased differential element

Load terminal current Is0

Differential overcurrent element

Load terminal current Is0

Biased differential element

B phase

2nd harmonic bloking

Differential overcurrent element

And gate

2f segregated phase Lock

2f all phase OR Lock

And gate

OR gate

And gate

OR gate

2f all phase OR Lock

Figure4.3 Load terminal current Is1/2setting value of biased differential element

Page 18

JEP0-IL9432 18

Harmonic component ratio to fundamental component (%) Exciting inrush current Internal fault current

1st cycle 2nd cycle 8th cycle No CT saturation CTsaturation DC component 58 58 58 38 0 Fundamental component 100 100 100 100 100

2nd harmonic component 62 63 65 9 4

3rd harmonic component 25 28 30 4 32

4th harmonic component 4 5 7 7 9

5th harmonic component 2 3 3 4 2

Page 19

JEP0-IL9432 19

4.1.2 General functions

(1) Operation indication

When operating signals come out for the biased differential element and differential overcurrent

element, the corresponding operation indicator LED will come on instantaneously.

For the 2nd harmonic blocking element, when the 2nd harmonic component ratio of input current

becomes more than the operation setting, the corresponding operation indicator LED will blink.

The operation indicator LED has been set to self-hold in the factory. This setting can be freely

changed to auto reset.

With the self-hold setting, data of the latest operation indication will be stored in the internal memory

even if the auxiliary power supply runs down.

The data stored will be cleared when the indicator reset switch is pressed.

Up to latest five phenomena can be stored and displayed as a history record. (Older data than the

latest five phenomena will automatically be cleared). Item No. History Sequence of recording

311 1st phenomena 312 2nd phenomena 313 3rd phenomena 314 4th phenomena 315 5th phenomena

Latest fault record data

Oldest fault record data

(2) Output contacts

The signaling outputs X0 to X3 and trip outputs X4 and X5 are all programmable type.

The factory default setting of the arrangement of these outputs is as shown in the internal function

block diagram of Figure 5.2. This setting can be freely changed by specifying outputs of the internal

elements based on the OR logic.

All the output contacts have been set to auto reset in the factory. Any of them can be changed to

self-hold.

I >>

I >

I >>

I > Signaling

(4 circuits)

Trip (2 circuits)

Set output logic as desired by using

OR logic.

Figure 4.4 Schematic image of Programmable Outputs (example: COC4-A01D1)

(3) Forced operation

It is possible to carry out forced operation of any of the signaling outputs X0 to X3 and trip outputs X4

and X5 independently. Forced operation is useful for checking the wiring.

When forced operation is carried out, the corresponding LED lamps will come on to show the current

status of the programmable outputs. Checking the lamp status will be useful not only for the wiring

check but also to check the programmable outputs arrangement.

Page 20

JEP0-IL9432 20

4.2 Setting

87T

1000/5A CT

300/5A CT

Example of transformer circuit for setting calculation

In order to set the relay correctly, please carry out the setting calculation as shown below and set the relay

according to the calculation results.

4.2.1 Setting of CT ratio matching tap

(1) Required data for calculation

a. Rated capacity of the protected transformer

b. Rated voltage of transformer (High voltage side: VH, Low voltage side: VL)

c. Transformation ratio of CT

d. Exciting characteristic of CT (It is not always required)

e. One way conductor resistance of CT secondary (Including CT winding resistance) (RL: value at

25C) f. Connecting method of CT secondary

(2) Meanings of various symbols

a. IP = CT primary current at rated output of transformer

b. IS = CT secondary current at rated output of transformer

c. IR = Relay input current at rated output of transformer

IRH: High voltage side, IRL: Low voltage side

d. ITH = IT1 = CT matching tap value (High voltage side)

ITL = IT2= CT matching tap value (Low voltage side)

f. ZT = CT secondary total burden

(3) Calculation method

a. Selection method of CT ratio

Select the CT ratio according to the following concepts.

- CT secondary current at the transformer rated capacity is less than 2 times rated current of relay

(In).

-To keep the sensitivity, CT secondary current is more than 2.2A (when In = 5A) or more

than0.44A (when In = 1A)

(Because minimum matching tap is 2.2A and 0.44A.)

Page 21

JEP0-IL9432 21

b. Calculation of mismatch ratio

% mismatch = 100 [(IRH/IRL)-(ITH/ITL)]/S

In this equation, S shows the smaller value of IRH/IRL and ITH/ITL.

In the case of transformer with tap changer, perform the setting basing on the rated value at the

midpoint of the tap changer. Then, the mismatch of tap changer must be added into the above

mismatch.

Thus, select the appropriate CT matching tap so that the calculated mismatch ratio is not more

than 15%.

c. Examination of CT operation characteristics

For the calculation of CT error, it is required to obtain a total burden including CT winding

resistance. Total burden ZT can be determined by the following equation.

ZT = CT secondary resistance + relay burden

= 1.13 RL + relay burden (In the case of -CT)

In the case of -CT, ZT becomes 3 times of the above value. And the above coefficient 1.13 is

used to add the increased resistance of RL due to the temperature rise during the fault continuity.

The CT ratio error (% for secondary current) at the external fault is calculated by the CT exciting

current presumed from the CT exciting characteristic using the total burden voltage calculated by

the total burden and the fault current,

It is the proper condition that the sum of The CT ratio error and the mismatch ratio (%) does not

exceed the bias setting value of the relay (20%, 30%, 40%) throughout the external fault

condition,

(4) Calculation example

Data

Transformer rating

High voltage side: 7500kVA 22kV

Low voltage side: 7500kVA 6.6kV

Calculation

Calculate according to the following procedure.

High voltage side Low voltage side

a. IP A 196.8= 3kV 22

kVA 7500 A 656.1

3kV 6.6 kVA 7500

Page 22

JEP0-IL9432 22

b. Set the CT ratio 60=A5300 200=A51000

c. IR A 5.68=3 60

A 8.196 =IRH A 3.28=

200 A 1.656

=IRL

d. IT A 68.5=I=I RHTH A 28.3=I=I RLTL

The relay will be set at the nearest value to the above calculation results based on the setting

step.

A 7.5=I=I TH1T A 3.3=I=I TL2T

Note

When the calculated IT1 or IT2 are outside the CT matching setting range (2.212.5A), calculate the

setting value again after changing the relay rated current (In) to a value which is possible to set.

For instance, if a calculation result IRH was less than 2.2A (for example IRH=2A), it becomes

impossible to set the relay.

In this case, the calculation should be done again like the following.

Let

A 2.2=ITH

Then

A 3.63= A 2 A 2.2

A 3.3=ITL

The relay will be set at the nearest value to the above calculation results based on the setting step.

A 2.2=I=I TH1T A 6.3=I=I TL2T

e. Calculation of

mismatch ratio

( ) ( ) % 0.58=

1.72 1.72-1.73

= S

II-II =ratio Mismatch

72.1= 3.3 7.5

= I I

73.1= 28.3 68.5

= I I

TLTHRLRH

Page 23

JEP0-IL9432 23

4.2.2 Setting of minimum operation value Minop

(1) Required data for calculation

a. Transformer tap changing error

b. CT error at normal condition (Ratio error, phase angle error)

c. Relay operation value error

d. Mismatch error

(2) Calculation example Data

a. Transformer tap changing error

Max.10%

b. CT error at normal condition (in case of class 1.0)

Ratio error2One degree phase angle error2 (0.01)2SIN(1)2

0.02

2% c. Relay operation value error

Operation value 10%

d. Mismatch error

0.58%

Calculation Sum of the above error (a to d) is the differential error at normal condition (% to CT matching tap value).

more) or times 2~1.5 :allowance of standard The (

(times) 1.93= 15.58%

30% =allowance the y,Accordingl

15.58%= 30%=op Min. Assume,

op.Min1.0+12.58%= %58.0+op.Min1.0+%2+%0.10=

Page 24

JEP0-IL9432 24

4.2.3 Setting of bias ratio

Data

a. Transformer tap changing error 10% at external fault (in the case of transformer with tap changer)

b. CT error Max. 10% at external fault

c. Relay bias ratio error Bias ratio 5%

d. Mismatch error 0.58%

Calculation

Sum of the above error (a to d) is the differential error at external fault (% to through fault current).

4.2.4 Setting of differential overcurrent element

It is recommended to set the differential overcurrent element with a value more than the exciting

inrush current.

IT Setting value of operation current of differential overcurrent element > Exciting inrush current

more)or times2~1.5 :allowance of standard The (

(times) 1.56 25.58%

40%allowamce they,Accordingl

40% Assume, 25.58%

0.58%%510%10%

= =

+++=

Page 25

JEP0-IL9432 25

4.3 Measurement

Currents input to the relay are measured and converted into freely set CT primary currents, then indicated

on the display.

(1) Real time measurement

The effective current (Restraining current and differential current) inputting into the relay under steady

state is displayed for each phase.

Please confirm there is no differential current larger than the assumption.

(2) Max. record

The maximum effective current is recorded and stored for each phase.

The max. record will be all cleared when aux. power supply OFF or max. record reset operation is

made.

(3) Fault record

In the event of system fault, the effective current, 2nd harmonic component ratio and waveform data

that have been measured at the time when one of the protection elements operates to issue an

output signal are stored. Data of up to five phenomena can be stored and displayed for each phase.

With aux. power supply OFF, only the wave form data will be cleared and the effective current data

will remain. With fault record reset operation, however, both of the data items will be all cleared.

(Records older than the 5th phenomenon will automatically be cleared.) Item No. History Sequence of recording

211 1st phenomena 212 2nd phenomena 213 3rd phenomena 214 4th phenomena 215 5th phenomena

Latest fault record data

Oldest fault record data

The following fault waveform data can be collected if a communication card is installed:

The peak value of waveform data is n derived from CT secondary current with matching tap conversion. Item Specification

Data sampling cycle Fixed to the electric angle of 30 of rated frequency Data storing capacity (for a phenomenon)

224 cycles of rated frequency (Data point: 224360/30 = 2688 points)

Permissible setting range 224 cycles before trip ~ 224 cycles after trip

Collected data The range for data collection can be set by cycle within the data storing capacity in the permissible set range.

224 cycles after trip224 cycles before trip

Collected data Up to 224 cycles

Data sampling cycle

Trip occurs!

Output contact ON

OFF

Permissible set range

Figure 4.5 Recording concept of fault waveform

Page 26

JEP0-IL9432 26

4.4 Self-diagnosis

The self-diagnosis function monitors the electronic circuit and built-in power source continuously. If an

abnormal condition occurs, the protection elements will be locked for operation. Also, the RUN LED lamp

will go off and self-diagnosis output contact (break contact) will be closed.

(1) Checking the defect code at failure detection

When a failure is detected, the defect code will be recorded. This defect code can be checked

through self-diagnosis (ALARM) status indication .

(2) Resetting self-diagnosis output

If a failure is detected, the failure status may be reset by turning off/on the power.

In this case, be sure to lock the trip circuit on the external wiring of the relay before resetting.

(If the failure persists, an erroneous output may be caused.)

(3) Clearing the defect code

The defect code data stored at failure detection can not be cleared only by carrying out the power

on/off procedure in the item (2) above. All the defect code numbers that have been detected since

the previous self-diagnosis reset (RESET ALARM) operation was made are accumulated in the

memory.

To clear the record data, carry out self-diagnosis reset (RESET ALARM)operation.

(4) Differential current check (Defect code 0017)

The followings are the explanation of the differential current check.

This check item monitors the differential current calculated inside of the relay and issue the alarm

when the differential current is more than 80% of minimum operating value (Inoperating current

setting (20%~40%) and such condition is continued more than 20 seconds.

The differential current check monitoring is effective to prevent the relay from miss operation due to

the defects of parts caused by aging.

Therefore, differential current alarm will be issued with the following cases.

In case of one side current injection test, defect code 0017 will be issued when injection period is

more than 20 seconds.

To prevent such a detection, setting item [DIF test] should be set as [ON[ position during the test.

DIF test LED(yellow) will come on when DIF test set as [ON] and please pay attention that never

forget to change the DIF test setting from [ON] to [OFF] after completion of the test and confirm

the LED coming off.

Occurrence of differential current due to miss setting of matching taps.

Occurrence of differential current due to wrong connection of cables located outside of relay.

Page 27

JEP0-IL9432 27

Table 4.1 Output for protection relay failures

Output Display Status Detected items

RUN Defect code

ALARM (break

contact)

Operation output lock

Normal - On Open Not locked Power circuit

failure - Locked

CPU stop -

No display

45 ROM check 0001 RAM check 0002 A/D accuracy check 0003 A/I check 0004 A/D check 0005 SRAM check 0006 D/O status check 0008 D/O operation check 0009 Analog filter check 0010 A/I double check 0011 D/I check *41 0012 E2PROM check 0013 Computing function check 0014 WDT check 0015 Data transfer check *42 0016 Differential current check *43

Off

0017

Closed

Locked

Communication card check *44 0028 Communication card channel No. switch setting error *44 0029 Communication card baud rate switch setting error *44 0030 Communication card channel No. switch change error *44 0031

Monitor error

Communication card baud rate switch change error *44

0032

Open Not locked

*41 Monitored only in the models with built-in D/I function. *42 Monitored only in the models with D2 unit. *43 Monitored only the biased differential relay. *44 Monitored only when communication card is installed inside the relay. *45 No necessary to lock the output as any output would not be possible during CPU stop.

Page 28

JEP0-IL9432 28

4.5 Communication (option) Figure 4.6 shows an example of network system configuration.

For more information on the communication facilities, see the materials shown in the introduction (page 2).

Figure 4.6 Example of communication network system configuration

Central Control System

The network system enables the central control system to fully access to the protection relays, and achieve remote monitoring of the measurement values, operational status etc as well as remote operation such as change of settings. Thereby efficient operation and maintenance are realized.

- CC-Link RTU

Remote Operation and Monitoring

By connecting PC with relay via the RS232C port located on the relay panel, local operation and monitoring are enabled as same as the remote operation and monitoring. Thereby the maintenance work at site is strongly supported.

RS232C

Local Operation and Monitoring for Site Maintenance

- Measurement value - Relay settings - Relay operation status - Fault Record - Monitoring status - Time

- Measurement setting - Relay setting - Time Adjustment

Remote Operation Remote Monitoring

Local Operation Local Monitoring

Page 29

JEP0-IL9432 29

By connecting PC with relay via the direct communication port (as standard equipment located on the relay front

panel, local operation and monitoring are enabled as same as the remote operation and monitoring.

Please note that optional HMI software for PC is needed for local operation and monitoring.

Using the communication facilitates, it is possible to perform Remote Monitoring and Remote Operation with

the various useful functions shown in Table 4.2.

Table 4.2 Outline of functions enabled by communication network

Direction of communication Item Description

Setting Read the settings stored in the protection relay. Measurement Read the measurements stored in the protection relay. Max. value Read the max. values stored in the protection relay. Fault record Read the measurements at the time of trip. Self- diagnosis (ALARM) Read the result of self-diagnosis. Operation element Read the elements that operated at the time of trip. Operation time Read the time at the time of trip. Current time Read the internal time of the communication card.

Remote Monitoring

RTU Protection relay

Wave form record Read the wave form at the time of trip. Setting Change the setting of the protection relay. Indicator reset Reset the LED lamp that came on at the time of trip. Self-diagnosis reset (RESET ALARM)

Clear the result of self-diagnosis

Fault record reset Clear the fault record, operation elements and operation time data.

Max. record reset Clear the max. records. Forced operation Carry out forced operation of output contact.

Remote Operation

RTU Protection

relay Time Set time of communicate card.

Page 30

JEP0-IL9432 30

5 Configuration 5.1 Internal configuration

(1) I/O and CPU circuits

Fig. 5.1 shows the internal block diagram of the model CAC1-A01D2.

Current input is converted into AC signals at the electronic circuit level via the auxiliary transformer

and filter circuits. These signals are retained as a form of DC signal in the sample hold circuit on each

channel sharing a same time. The multiplexer selects a channel to take the signal and send it to an

A/D converter. The signals are converted to digital signals sequentially in the converter to be sent to

the CPU.

The setting circuit is used to input setting data into the CPU.

These inputs will be used to carry out the functions shown in Fig. 5.2 Internal function block diagram,

then issue output signals to the display and output relay.

(2) Self-diagnosis circuit

When the self-diagnosis function detects that the electronic and power circuits are normal, the output

relay will be energized to open the self-diagnosis output contact (break contact).

The self-diagnosis output contact (break contact) will be closed when a failure occurs in the circuits

above or when the built-in power fuse burns.

Page 31

3 1

J E P 0 - I L 9 4 3 2

M P

Setting switches

A/D

C P

Numerical display

A-phase biased diff. ind. A-17

IA1

A-18

S/H Filter

For trip X5

2f blocking (A,B,C phase) X3

C-phase biased diff./diff. O.CX2

B-phase biased diff./diff. O.CX1

A-phase biased diff./diff. O.CX0

Communication indicator

Unit indicator

Trip operation indicator

C-phase 2f blocking ind.

C-phase diff. overcurrent

C-phase biased diff. ind.

B-phase 2f blocking ind.

B-phase diff. overcurrent

B-phase biased diff. ind.

A-phase 2f blocking ind.

Power circuit monitor

A-01 AC/DC DC/DC Power source

Auxiliary power supply

A-03

X5 B-19

B-20

X4 B-17

B-18 Trip

Programmable output

B-11

B-12

B-13

B-14

Biased diff. /diff. O.C

A-phase

Biased diff. /diff. O.C

B-phase

Biased diff. /diff. O.C

C-phase

2f blocking A,B,C phase

Signaling

Self-diagnosis output Y

Self-diagnosis output B-05

B-06

Serial communication bus

DAB-01

DBB-02

DGB-03

SLDB-04E A-02

RUN indicator

Self-diagnosis (Excluding comm. card)

Communication card

Self-diagnosis (only comm. card)

Reception circuit

Transmission circuit

A-19

IB1

A-20

S/H Filter

A-21

IC1

A-22

S/H Filter

A-11

IA2

A-12

S/H Filter

A-13

IB2

A-14

S/H Filter

A-15

IC2

A-16

S/H Filter

P rim

ar y

w in

di ng

s S

ec on

da ry

w in

di ng

A-phase diff. overcurrent

X B-07

B-08

X1 B-09

B-10

Figure 5.1 Internal block diagram of Type CAC1-A01D2 relay

Page 32

3 2

J E P 0 - I L 9 4 3 2

A-phase biased diff. ind.

B-phase 2f blocking ind.

A-phase 2f blocking ind.

Power circuit monitor

Self-diagnosis (Excluding comm.card)

A-01

A-03

A-phase diff. overcurrent

B-phase biased diff. ind.

C-phase diff. overcurrent

B-phase diff. overcurrent

C-phase biased diff. ind.

Trip operation indicator

B-phase biased diff./diff. O.CX1

A-phase biased diff./diff. O.CX0

C-phase biased diff./diff. O.CX2

2f blocking (A,B,C phase) X3

For trip X4

Self-diagnosis output Y

B-05

B-06

X5 B-19

B-20

X4 B-17

B-18

X3 B-13

B-14

X2 B-11

B-12

X1 B-09

B-10

X0 B-07

B-08

A-17

IA1

A-18

DAB-01

DBB-02

DGB-03

SLDB-04E A-02

RUN indicator

Communication indicator

A-13

IB2

A-14

A-19

IB1

A-20

A-21

IC1

A-22 A-11

IA2

A-12

A-15

IC2

A-16

S ec

on da

ry w

in di

ng s

Pr im

ar y

w in

di ng

Biased differential

A-phase

B-phase

C-phase

C-phase 2f blocking ind. Biased differential

Differential overcurrent

2f blocking ratio

Differential overcurrent

Biased differential

Auxiliary power supply

AC/DC DC/DC Power source

Programmable output X5

Communication card

Self-diagnosis(only comm. card)

Reception circuit

Transmission circuit Serial communication bus

Programmable output

Trip

Signaling

Biased diff. /diff. O.C

A-phase

Biased diff. /diff. O.C

B-phase

Biased diff. /diff. O.C

C-phase

2f blocking A,B,C phase

Self-diagnosis output 2f blocking ratio

Differential overcurrent

Figure 5.2 Internal function block diagram of type CAC1-A01D2

Page 33

JEP0-IL9432 33

5.2 External connection

(1) Connection diagram

Figures 5.4 to 5.7 show examples of input circuit (AC circuit) connection, Figure 5.8 shows an

example of control circuit (DC circuit) connection and Figure 5.9 shows the terminal arrangement.

In the terminals, M3.5 screws should be used and wires of 2 mm2 or less are recommended using.

(2) Precautions for wiring work

a. Important facilities should be provided with the redundant system such as the fail-safe system, the

dual system or the 2 out of 3 system to improve reliability of the facilities.

b. Effects of external surge

Some type of surge with a certain condition may inversely affect the relay. If so, take it into account

to install MF type surge absorbers made by Mitsubishi Electric .

c. Guarantee of AC auxiliary power supply against power interruption

The AC auxiliary supply of the relay is not guaranteed against power interruption. When you do not

have an uninterruptible AC power source, use the type B-T1 backup power supply manufactured by

Mitsubishi Electric or uninterruptible power source (UPS) that is commercially available.

d. Inrush current of auxiliary supply

Since inrush current may flow in the relay when the auxiliary power supply is turned on as shown in

the figure below, make consideration of this point when selecting the breaker for auxiliary power

supply circuit.

Input voltage Inrush current Ip

110V Approx. 20ADC 220V Approx. 55A 100V Approx. 25A

AC 220V Approx. 65A

Figure 5.3 Inrush current of auxiliary power supply

e. Trip circuit

Only the contacts X4 and X5 can be used for the trip circuit. Please keep in mind that the contacts X0

to X3 cannot be used for the trip circuit. (If used, the contact may burn).

Connect the pallet contact (52a) of the circuit breaker to the trip circuit.

f. Self-diagnosis output circuit

The self-diagnosis output contact is so configured that the auxiliary relay can be energized (break

contact) with normal result of monitoring, in order to be able to continue monitoring even if the

built-in power fuse burns. Therefore, connect the timer to the external wiring. (See Fig. 5.8 DC

circuit connection diagram).

g. Earth circuit

Be sure to earth the earth terminal located on the back of the relay according to the Class D earth

wiring method.

Inrush current

Approx. 2ms

Inputting

Input voltage

Input current

Page 34

JEP0-IL9432 34

Self-diagnosis output

Trip

DA DB

SLD

B-06

B-05

B-07

B-08

B-09

B-10

B-11

B-12

B-13

B-14

B-17

B-18

B-19

B-20

B-01

B-02

B-03

B-04 A-02 option

Auxiliary power Supply

A-01

A-03

A-17

A-18

A-19

A-20

A B C Y

Programmable output

Signaling

Biased differential Differentia overcurrent A phase

A-21

A-22

B A

A-11

A-12

A-13

A-14

A-15

A-16

(ED)(ED)

(ED)

CT1

CT2

Transfotmer - (Dd0)

IA IB IC 2f blocking (ABC phase)

Biased differential Differentia overcurrent A phase or B phase or C phase

IA IB IC

Dd0

IA IB IC

C HV side

LV side C om

m . c

ar d

Biased differential Differentia overcurrent B phase

Biased differential Differentia overcurrent C phase

Serial communication bus Dont input the withstand voltage for test

CT secondary circuit should be connected so as HV side current to be inflow to the Ry terminal of HV side and LV side current to be out flow from the Ry terminal of LVside with keeping same phase angle between bothside, when flow through current is placed.

Figure 5.4 External connection diagram (AC circuit) for CAC1-A01D2 relay

[Example 1]

Page 35

JEP0-IL9432 35

A B C

B C

A-17 A-18 A-19 A-20 A-21 A-22

A-11 A-12 A-13 A-14 A-15 A-16

IA2 IB2 IC2

IA1 IB1 IC1

IA IB IC

IA-B IB-C IC-A

CAC1-A01D2 Yd11

IA IB IC

IA-B IB-C IC-A

HV side

LV side

Figure 5.5 External connection diagram (AC circuit) for CAC1-A01D2 relay

[Example 2]

Page 36

JEP0-IL9432 36

A B C

B C

A-17 A-18 A-19 A-20 A-21 A-22

A-11 A-12 A-13 A-14 A-15 A-16

IA2 IB2 IC2

IA1 IB1 IC1

IA IB IC

IA-C IB-A IC-B

CAC1-A01D2 Yd1

IA IB IC

IA-C IB-A IC-B

HV side

LV side

Figure 5.6 External connection diagram (AC circuit) for CAC1-A01D2 relay

[Example 3]

Page 37

JEP0-IL9432 37

A B C

B C

C A-17 A-18 A-19 A-20 A-21 A-22

A-11 A-12 A-13 A-14 A-15 A-16

IA2 IB2 IC2

IA1 IB1 IC1

IA IB IC

IA-C IB-A IC-B

IC-B IB-AIA-C

CAC1-A01D2

Dy11

IA IB IC

IA-C IB-A IC-B IC

IA HV side

LV side

Figure 5.7 External connection diagram (AC circuit) for CAC1-A01D2 relay

[Example 4]

Page 38

JEP0-IL9432 38

A B C

B C

A-17 A-18 A-19 A-20 A-21 A-22

A-11 A-12 A-13 A-14 A-15 A-16

IA2 IB2 IC2

IA1 IB1 IC1

IA IB IC

IA-B IB-C IC-A

IC-A IB-CIA-B

CAC1-A01D2

Dy1

IA IB IC

IA-B IB-C IC-A

HV side

LV side

Figure 5.8 External connection diagram (AC circuit) for CAC1-A01D2 relay

[Example 5]

Page 39

3 9

J E P 0 - I L 9 4 3 2

Self-diagnosis output

SLD

B-02

B-03

B-04

Serial communication bus

E A-02

+ Auxiliary power supply

A-01

A-03

Programmable output

Signaling

B-T1 type back up power supply

UPS()

52a

100VDC ~ 220VDC 100VAC ~ 220VAC()

To master station (when communication card installed)

Note 1) The self-diagnosis output contact is so configured as below mentioned that alarm can be issued even after the built-in power fuse burns. This type of auxiliary relay circuit configured such that relay will be energized (break contact opened) when normal result of self-diagnosis is received. Therefore, the break contact is closed when the power is applied and will be opened after about 50ms. If the auxiliary power supply of the relay and the self-diagnosis output contact shares a same power source, the break contact will be closed temporarily after the auxiliary power supply is turned on. In the case where the phenomenon stated in the above would conflict with your system requirement, it is recommended that the self-diagnosis output contact should be connected via the time-delayed timer as shown in the left of the figure.

Note 2) Regarding to the type B-T1 back up power supply or commercially available uninterruptible power supply (UPS), refer to the note *21 in the section 2.1 General information.

Trip

B-06

B-05

B-07

B-08

B-09

B-10

B-11

B-12 B-13

B-14

B-17

B-18 B-19

B-20

B-01

Earth fault instantaneous

I >>

Phase fault time-delayed

Earth fault time-delayed

I > Phase fault

instantaneous I>>

To control system (alarm and other signals)

Time-delayed operation contact

(make contact Approx. 1s)

() Refer to the page 33, 5.2 External connection (2) Precautions for wiring work c. Guarantee of AC auxiliary power supply against power interruption.

Figure 5.9 Auxiliary power supply circuit connection example of type CAC1-A01D2 relay

Page 40

JEP0-IL9432 40

Auxiliary

power supply +

Earth circuit

62-M3.5 screws

Figure 5.10 Rear view of type CAC1-A01D2 relay

Page 41

JEP0-IL9432 41

6 Handling 6.1 Unpacking

Usually this relay is packed in a D2 case for transportation. However, it may occur that only the sub unit is

transported independently for the convenience at repair. In such a case, fully brush off the dust, dirt, etc.

adhered to the sub unit after completion of unpacking, and further visually check that the parts mounted

on the front panel or built in the sub unit are not damaged.

6.2 Transportation and storage

To carry the equipment within the place of use, handle it carefully so that the parts installed on the front

panel of the sub unit or built-in parts cannot be deformed or broken.

6.3 Appearance and how to pull sub unit out

The relay is so constructed that the sub unit can be drawn out, in order to facilitate inspection or test. It is

possible to pull the sub unit out without disconnecting the external wiring.

Note that the sub unit should not be drawn out with the line hot. Before drawing out, be sure to take the

following actions.

- Lock the tripping circuit including breakers.

- Stop the main circuit.

- Shorten and isolate the CT circuit.

- Open the auxiliary power supply circuit.

Bear in mind that careless opening of circuits may result in opening the other control circuits too to impair

the protective function. Be sure to only shut off the concerned circuit.

The CT circuit is provided with an automatic short circuit mechanism. In case that you have pulled the sub

unit out without isolating the CT circuit by mistake, the automatic short circuit mechanism will work to

prevent the CT secondary circuit from opening.

Lock levers

Case

Sub unit

Cover

Draw-out handles

Communication card

Cover operating buttons Draw-out auxiliary levers

Temporary stopper

Option

Figure 6.1 Outside view of type CAC1-A01D2 relay

Page 42

JEP0-IL9432 42

6.3.1 How to draw sub unit out

(1) Removing the cover

Hold the lock levers, which are located at both sides of the cover, on their front sections. Take off the cover straight toward you while pushing the levers inwards.

(2) Drawing the sub unit

Please from under to upper direction turn round the draw-out auxiliary levers located on both sides of the front of the sub unit until the levers touch the metallic parts located on both sides of draw-out handles completely. (Rotated angle is approx. 120) Note) Be careful not to put your fingers into the

space between drawing-out auxiliary levers and the case.

With the draw-out auxiliary levers touching the metallic parts, exert your strength to turn round the levers continuously, the sub unit will be drawn out a little from the case. Then be careful not to let the draw-out auxiliary levers fall down and to make the draw-out auxiliary levers into a locked status by the with-holders located on the both sides upper the auxiliary levers please. (Rotated angle is from approx. 120to 180) Note) Be careful not to put your fingers into the

space between drawing-out auxiliary levers and the case.

Page 43

JEP0-IL9432 43

Grip the draw-out handles (located at both sides of the front of the sub unit), and pull the sub unit towards you until about a half portion of the sub unit is pulled out of the case. Note) Be careful not to pull out the sub unit too

much in order to prevent the sub unit falling.

When about a half portion of the sub unit is pulled out of the case, just stop the drawing motion. Then, hold the top and bottom of the sub unit to pull it out completely, in order to prevent the unit from falling. Note) Be careful not to touch the printed circuit

board and parts inside the sub unit.

Page 44

JEP0-IL9432 44

6.3.2 Housing the sub unit

(1) Housing the sub unit

Hold the sub unit on the top and bottom to push the unit into the case approx. a half of the unit. Note) - Be careful not to touch the PCB and parts inside

the sub unit. - The sub unit is so constructed that it can not be

housed in the case upside down.

Under holding the auxiliary levers locked status by the with-holder (not to let the draw-out auxiliary levers fall down), Insert the sub unit into the case until the auxiliary levers touch the metallic parts while pressing the handles located on both sides of the front of the sub unit.

More fully insert the sub unit into the case until the auxiliary levers fall down automatically and catch the metal holes inside with its hooks. (Rotating angle is from 180 to approx. 45) Note) If the auxiliary levers are not available to

complement the wanted operation automatically, operate the auxiliary levers and make it achieve the above status please.

At this time be also careful that do not injure your fingers.

Page 45

JEP0-IL9432 45

Exert your strength to press the lower parts of the auxiliary levers to fully insert the sub unit into the case until you hear a click. (Rotated angle is from 45 to approx. 0) Note) Please note that inserting the sub-unit

incompletely may only establish a poor contact of the terminals located on the back of the unit, which may cause operational failure or heating.

(2) Attaching the cover

Fit the cover straight to the case. Hold the cover frame to fully push the lock levers, located both side of the cover, to case side until it is clicked and locked. Note) After setting the cover, check if the buttons

can be smoothly pressed from over the cover.

Page 46

JEP0-IL9432 46

6.4 How to use front control panel

6.4.1 Front control panel layout

C -P HA

B -P HA

5 D

o w

n s

w it c h

6 In

di ca

tio n/

In d. E

nd s

w itc

7 O

pe ra

ti on

in di

ca to

r R es

ST YL

AU X.

JE J2

95 15

H0 1

BI AS

ED D

IF FE

RE NT

IA L R

EL AY

OP ER

AT IO

N IN

DI CA

TO R

TR IP

SE T.E

ND SE T

SE LE

CA NC

SE TT

ING

IT EM

D AT

YE AR

-D

SE RI

RA TIN

C A

C 1-

A 01

D 2

EN D

IN D.

DO W

A -P HA

A CO MM

RU N

DI F-

TE ST

Id >

-C

2f B-

C 2f

B- B

2f B-

Id >

-B

Id >

-A

RE SE

Id/ I>

-C

TR IP

Id/ I>

-A

Id/ I>

-B

1 S

e tt

in g/

C an

c e l sw

it c h

8 I te

m N

o . in

di c at

o r

L E D

14 S

et ti ng

/C an

ce l i

nd ic

at or

3 S et

ti ng

e nd

/T ri p

sw it ch

15 S

et ti ng

e nd

/T ri p

in di

ca to

1 6 O

pe ra

ti o n i n d ic

at o rs

2 S

e le

c t/

S e t

sw it c h

S- 23

IT EM

N o.

M E

LP R

1 2 U

n it L

E D

1 3 P

h as

e L

E D

9 I te

m d

at a

L E D

10 R U N L E D

11 C o m m u n i c a t i o n L E D

ST AT

AL AR

OP .-E

LE ME

ME AS

UR EM

EN T

I R ES

(M AX

.-R EC

) I D

IF (R

EA L.-

TIM E)

2f / 1

f (R EA

L-T IM

I R ES

(R EA

L-T IM

I D IF

(M AX

.-R EC

I R ES

(F AU

LT -R

EC .)

I D IF

(F AU

LT -R

EC .)

2f / 1f

(FA UL

T-R EC

CT -M

AC TC

H.- PR

I.(A )

CT -M

AC TC

H.- SE

C.( A)

CU RR

EN T(

MU L.)

SE TT

IN G

Id / I

[D IF

]

CU RR

EN T(

% )

BI AS

(% )

DI F-

TE ST

2fB

LO CK

[2f B]

2fB

R AT

E( %

) Id

> [H

OC ]

CT - P

OL AR

ITY CH

EC K

PA SS

WO RD

ON / O

RE SE

T F AU

LT R

EC .

OP TIO

RE SE

T A LA

TE ST

LE D

FO RC

ED OP

ER AT

ION

CO NT

AC T X

5 O P.

CO NT

AC T X

0 O P.

CO NT

. X 0

X5 AR

OP .IN

D. -H

OL D

(R EF

.M AN

UA L)

RE SE

T M AX

. - R EC

EF .M

AN UA

Tu rn

o n

th e

se tti

of th

e ite

m N

o. 51

5 in

th e

te st

in g

17 D

ir ec

t co

m m

un ic

at io

n po

Figure 6.2 Front view of type CAC1-A01D2 relay

Page 47

JEP0-IL9432 47

Table 6.1 Front control panel guide

No. Designation Symbol Description 1 Setting / Cancel

SETTING/CANCEL

Pressing this switch will start the procedure for setting, forced operation or option. When this switch is pressed again instead of the SET.END/TRIP switch, data that has been programmed

will be all cleared to terminate the selected procedure. The SETTING/CANCEL indicator LED is lit during the procedure.

2 Select / Set

SELECT/SET

This switch is used to select an item number and to program item data during setting, forced operation or option procedure. When data is programmed to be ready for replacing the currently used setting, the SET.END/TRIP LED will blink.

3 Setting End / Trip

SET. END/TRIP

When the SET.END/TRIP switch is pressed with its LED blinking during setting, forced operation or option procedure, the currently enabled setting will be replaced by data given by programming. The new setting will be thus enabled.

4 UP select UP

5 DOWN select DOWN

These switches are used for selecting data elements. Pressing these switches for a while will allow fast forwarding. With the cover operating buttons, you can use the switches without removing the cover.

6 Indication / Indication End

IND./IND.END

Pressing this switch will start or end the display of settings and measurements. With the cover operating button, you can use the switch without removing the cover.

O pe

ra tio

na l k

ey s

w itc

he s

Reset

RESET

Pressing this switch will reset output contacts after the relay operated and extinguish the operation indicator LEDs. With the cover operating button, you can use the switch without removing the cover.

8 Item No. Green -

A number allocated to the selected setting, forced operation or option item is indicated here.

9 Item Data Red

Data that corresponds to the item number selected is displayed here. For the indication of individual letters, see the Table6.2 manual specifically prepared for each model.

10 RUN Green -

Indicate the result of the automatic self-check. The lamp will be lit for normal results while off for abnormal.

11 Communication Green

Indicate the operational status of the communication card. - With a communication card installed: the lamp will be lit

for normal conditions, blinking during communication and off for abnormal conditions.

- With a communication card not installed: the lamp will be off.

12 Unit Yellow - Indicate the unit used for the item data. 13 Phase Yellow - Indicate the phase that corresponds to the item data. 14 Setting / Cancel Yellow

- This lamp will be lit during setting, forced operation or option procedure.

15 Setting End / Trip Yellow -

This lamp will blink when new data is programmed to be ready for replacing the currently enabled setting.

In di

ca to

r L E

D s

Operation / Detection / Test

Red Yellow Yellow

Indicate the operation elements and phases. (Trip, Id/I>, Id>) Indicate the detection elements and phases. (2fB) Indicate the test mode when setting.(DIF TEST)

17 Direct communication port

[current editions] - By connecting PC installed dedicated HMI software with relay, local operation and monitoring are enabled.

Page 48

JEP0-IL9432 48

Table 6.2 Letter representation of item data indicator LEDs

Item Designation Letters

Display in item data box

On ON

Off OFF

Yes YES

No NO

Operation lock LOCK

Page 49

JEP0-IL9432 49

6.4.2 Operational procedure For more information about the operational procedure shown below, see the MELPRO-D Series General

Operation Manual (JEP0-IL9416). 6.4.2.1 Relay without RS232C communication I/F

Table 6.3 Operational procedure

Item Corresponding section of general operation manual

No. Designation Description Indication mode

Setting/forced operation/option

mode

010 Restraining current (Real time value) Measure and display effective input value of restraining current at real time. A-1

011 Restraining current (Max. records) Display the max. effective restraining current. A-2

020 Differential current (Real time value) Measure and display effective input value of differential current at real time. A-1

021 Differential current (Max. records) Display the max. effective differential current. A-2

030 2f / 1f (Real time) Measure and display effective input value of 2f component ratio at real time. A-1

211 1st phenomena (Restraining current) 212 2nd phenomena (Restraining current) 213 3rd phenomena (Restraining current) 214 4th phenomena (Restraining current)

215 5th phenomena (Restraining current)

Record and display effective value of restraining current for the latest 5 phenomena of relay trip caused by system fault. The 1st phenomena is the latest trip and the 5th is the oldest one.

221 1st phenomena (Differential current) 222 2nd phenomena (Differential current) 223 3rd phenomena (Differential current) 224 4th phenomena (Differential current) 225 5th phenomena (Differential current)

Record and display effective value of differential current for the latest 5 phenomena of relay trip caused by system fault. The 1st phenomena is the latest trip and the 5th is the oldest one.

231 1st phenomena (2f / 1f) 232 2nd phenomena (2f / 1f) 233 3rd phenomena (2f / 1f) 234 4th phenomena (2f / 1f) 235

M ea

su re

m en

Fa ul

t r ec

or d

5th phenomena (2f / 1f)

Record and display effective value of 2f component ratio for the latest 5 phenomena of relay trip caused by system fault. The 1st phenomena is the latest trip and the 5th is the oldest one.

A-3

311 1st phenomena 312 2nd phenomena 313 3rd phenomena 314 4th phenomena 315 O

pe ra

tio n

el em

en ts

5th phenomena

Record and display the status of the operation indicator LEDs for up to five latest phenomena of relay trip caused by system fault. The 1st phenomena is the latest trip and the 5th is the oldest one.

A-4

400

S ta

tu s

Self-diagnosis (ALARM) Keep in record and display defect codes in the case where an abnormal condition is detected by the self-diagnosis.

A-6

511 Matching tap primary [A] 512 Matching tap secondary [A] 513 Operation current [%] 514 Bias [%] 515

Biased differential elements

DIF test

521 2f blocking 2f blocking rate [%]

531

S et

tin gs

P ha

se fa

ul t

Differential overcurrent

Operation current [Multiplier]

Set and display settings. A-7 B-1

700 Contact X0 operation 710 Contact X1 operation 720 Contact X2 operation 730 Contact X3 operation 740 Contact X4 operation 750

Fo rc

op er

at io

Contact X5 operation

Carry out forced operation of output contacts individually . The setting of programmable outputs can be checked through the operation indicator LEDs.

C-1

800 Contact X0 810 Contact X1 820 Contact X2 830 Contact X3 840

O pt

io n

Contact arrangement

Contact X4

Configure programmable output. Also, set and display self-hold/reset setting of programmable outputs. For the guide for setting, see the section 6.4.2.3 (1) below.

A-7 D-1

Page 50

JEP0-IL9432 50

850 Contact X5

860 Operation indicator LED hold Set and display self-hold/auto reset setting of the operation indicator LEDs. For the guide for setting, see the section 6.4.2.3 (2) below.

A-7 D-2

901 Reset Max. record Clear the data of the max. records. 902 Reset fault record Clear the data of the fault records. 903 Self-diagnosis reset (REST ALARM) Clear data of the self-diagnosis records.

D-4

904 Test LED lamp Carry out forced illumination of all the LED lamps on the front of the relay unit. D-5

905

O pt

io n

Check CT polarity Check the polarity of connected CT when connecting.

D-8

6.4.2.2 Relay with RS232C communication I/F

Item Corresponding section of general operation manual

No. Designation Description Indication mode

Setting / forced operation /

option mode

As the same as Table 6.3 described in item 6.4.2.1 about the No. 010860.

901 Relay password enable/disable option Set relay password enable or disable for setting. A-7 D-9

902 Max. record reset Clear data of the max. record. 903 Fault record reset Clear data of the fault record. 904 Self-diagnosis reset (RESET ALARM) Clear data of the self- diagnosis record.

D-4

905 LED lamp test Carry out forced illumination of all the LED lamps on the front of the relay unit. D-5

906

O pt

io n

Check CT polarity Check the polarity of connected CT when connecting.

D-8

Page 51

JEP0-IL9432 51

6.4.2.3 Guide for option function (1) Specifying contact arrangement data of output contacts

The table below shows the setting guide table. See the section D-1 of the general operation manual for the detailed procedure.

Input Digit No. Setting item

0 1 0 Self hold / auto reset upon reset Reset Hold 1 Biased differential A-phase(Note 2) Off On 2 Biased differential B-phase(Note 2) Off On 3 Biased differential C-phase(Note 2) Off On 4 Differential overcurrent A-phase Off On 5 Differential overcurrent B-phase Off On 6 Differential overcurrent C-phase Off On 7 2nd harmonic blocking A-phase(Note 1) Off On 8 2nd harmonic blocking B-phase(Note 1) Off On 9 2nd harmonic blocking C-phase(Note 1) Off On

10 Not used 11 Not used 12 Not used 13 Not used 14 Not used 15

O R

e le

m en

t c om

bi na

tio n

Not used

00000 0

Same as left

Contact arrangement data 0

Conversion from binary number to hexadecimal

Binary Hexadecimal Binary Hexadecimal Binary Hexadecimal 0 0 0 0 0 0 1 1 0 6 1 1 0 0 C

0 0 0 1 1 0 1 1 1 7 1 1 0 1 D

0 0 1 0 2 1 0 0 0 8 1 1 1 0 E

0 0 1 1 3 1 0 0 1 9 1 1 1 1 F

0 1 0 0 4 1 0 1 0 A

0 1 0 1 5 1 0 1 1 B

Same as left

When the product is shipped from the factory, contact arrangement data are set as follows.

Contact Item number

Contact arrangement data Setting of the element

X0 800 0012 Biased differential/Differential overcurrent A-phase X1 810 0024 Biased differential/Differential overcurrent B-phase X2 820 0048 Biased differential/Differential overcurrent C-phase X3 830 0380 2nd harmonic blocking A,B,C-phase X4 840 007E Biased differential/Differential overcurrent A,B,C-phase X5 850 007E Biased differential/Differential overcurrent A,B,C-phase

*The Self hold/auto reset setting are Reset (auto reset) for all contacts. (Note 1) If the 2nd harmonic blocking elements (the digit number 7 to 9) are set to ON for a contact arrangement, the contact will make when the 2nd harmonic blocking element operate. Therefore, set to OFF for the trip contact. (Note 2) Biased differential element for each phase has the 2nd harmonic blocking function. (Output of biased differential element for each phase is blocked by the 2nd harmonic blocking element operation signal.

Page 52

JEP0-IL9432 52

(2) Specifying operation indicator LED hold data The table below shows the setting guide table. See the section D-2 in the general operation

manual for the detailed procedure.

Input Digit

No. Setting item 0 1

0 Trip Reset Hold 1 Biased differential A-phase Reset Hold 2 Biased differential B-phase Reset Hold 3 Biased differential C-phase Reset Hold 4 Differential overcurrent A-phase Reset Hold 5 Differential overcurrent B-phase Reset Hold 6 Differential overcurrent C-phase Reset Hold 7 Not used 8 Not used 9 Not used 10 Not used 11 Not used 12 Not used 13 Not used 14 Not used 15 Not used

00000 0 0

Same as left

Operation indicator LED hold data 0

Conversion from binary number to hexadecimal

Binary Hexadecimal Binary Hexadecimal Binary Hexadecimal 0 0 0 0 0 0 1 1 0 6 1 1 0 0 C

0 0 0 1 1 0 1 1 1 7 1 1 0 1 D

0 0 1 0 2 1 0 0 0 8 1 1 1 0 E

0 0 1 1 3 1 0 0 1 9 1 1 1 1 F

0 1 0 0 4 1 0 1 0 A

0 1 0 1 5 1 0 1 1 B

Same as left

When the product is shipped from the factory, all LEDs are set to self-hold.

Item number Operation indicator LED hold data

860 007F

Page 53

JEP0-IL9432 53

(3) CT polarity check

This relay has a function that it can detect out the incorrect connection (polarity error or

phase-sequence error) of CT connected with the primary winding and secondary winding of

transformer. Be careful that it cannot detect out correctly if no current is flowing.(more than current

0.12A on the CT secondary side (relay input) is needed to detect correctly)

As the result of detection, if the code 0000 is displayed, it means that all of connection of CT is

correct. Otherwise it means that the connection of CT is incorrect.

The following table 6.4 shows the indicated codes (one instance) when carrying out CT polarity

check. You can reference it even for the other codes when you inform this function.

Please refer to the item 8 ofGeneral operation manualin which the detailed operation is

described.

Page 54

JEP0-IL9432 54

Table 6.4 Codes of CT polarity check (one instance)

Primary side Secondary side

A-phase B-phase C-phase A-phase B-phase C-phase Codes

0000

Polarity 0001

Polarity 0020

Polarity 0400

Polarity 0001

Polarity 0020

Polarity 0400

Phase Phase 0082

Phase Phase 1040

Phase Phase 0804

Phase Phase 0044

Phase Phase 0880

Phase Phase 1002

Phase/Polarity Phase 0090

Phase Phase/Polarity 0102

Phase Phase Polarity 0482

Polarity Phase Phase 1041

Phase/Polarity Phase 1200

Phase Phase/Polarity 2040

Phase/Polarity Phase 0808

Phase Polarity Phase 0824

Phase Phase/Polarity 4004

Phase/Polarity Phase 0048

Phase Phase/Polarity 0204

Phase Phase Polarity 0444

Polarity Phase Phase 0881

Phase/Polarity Phase 0900

Phase Phase/Polarity 4080

Phase/Polarity Phase 1010

Phase Polarity Phase 1022

Phase Phase/Polarity 2002

* The meanings of symbols in this table is shown below.

Polarity: CT polarity is incorrect.

Phase : The phase sequence is incorrect.

: No abnormality

Page 55

JEP0-IL9432 55

How to read and understand the CT polarity check codes

Output Digit No.

Error 0 1

0 Polarity error Correct Error

1 Phase sequence error (A-B[Prim.],A-C[Sec.]) Correct Error

2 Phase sequence error (A-B[Sec.],A-C[Prim.]) Correct Error

3 PhasePolarity error (A-B[Sec.],A-C[Prim.]) Correct Error

A - p h a s e

PhasePolarity error (A-B[Prim.],A-C[Sec.]) Correct Error

5 Polarity error Correct Error

6 Phase sequence error (A-B[Prim.],B-C[Sec.]) Correct Error

7 Phase sequence error (A-B[Sec.],B-C[Prim.]) Correct Error

8 PhasePolarity error (A-B[Sec.],B-C[Prim.]) Correct Error

B - p h a s e

PhasePolarity error (A-B[Prim.],B-C[Sec.]) Correct Error

10 Polarity error Correct Error

11 Phase sequence error (A-C[Prim.],B-C[Sec.]) Correct Error

12 Phase sequence error (A-C[Sec.],B-C[Prim.]) Correct Error

13 PhasePolarity error (A-C[Sec.],B-C[Prim.]) Correct Error

C - p h a s e

PhasePolarity error (A-C[Prim.],B-C[Sec.]) Correct Error

15 Not used 0

Binary Hexadecimal

0 0 0 0 0

0 0 0 1 1

0 0 1 0 2

0 0 1 1 3

0 1 0 0 4

0 1 0 1 5

Binary Hexadecimal

0 1 1 0 6

0 1 1 1 7

1 0 0 0 8

1 0 0 1 9

1 0 1 0 A

1 0 1 1 B

Binary Hexadecimal

1 1 0 0 C

1 1 0 1 D

1 1 1 0 E

1 1 1 1 F

Conversion from binary to hexadecimal

Same as left Same as left Same as left

Indication data of CT polarity

For instance, converse the displayed code from hexadecimal to binary, If (Digit No.=0) = 1, A-phase polarity (CT primary or secondary) is error. If (Digit No.=1) = 1, the phase sequence of A and B is error. (CT primary side) or the phase sequence of A and C is error (CT secondary side). If (Digit No.=3) = 1, the A-phase polarity of CT primary and secondary is error.

or the phase sequence of A and B is error (CT secondary side) or the phase sequence of A and C is error (CT primary side).

Page 56

JEP0-IL9432 56

7 Mounting 7.1 Mounting dimension

Mount the case to the panel according to Fig. 7.1 Mounting dimension.

Figure 7.1 Outside dimension /drilling drawing (D2 Case)

7.2 Standard operating environment

Install the relay in the environment described in section 3.3 Common technical data. In addition, the

following conditions should be kept:

- Abnormal vibration, shock, inclination or magnetic field should be avoided.

- Harmful smoke or gas, salt gas, excessive humidity, water drop or vapor, excessive dust or

fine powder, rain and wind should be avoided.

251

20 5

18 4

203

(18)

(185)

4-M5 screws(for mounting) M3.5 screw(for terminals)

19 4

15 0

4- 6 holes 214

230

Dimension in mm

Page 57

JEP0-IL9432 57

8 Test The relay has been fully tested prior to shipment. However, it is recommended to carry out a test again by

referring to the following test guide before use.

8.1 Appearance inspection

Check the relay for appearance according to the following procedure: Objects Check points Coil/conductor (1) Discoloring and burning due to overheat.

(2) Abnormal conditions including loosened screws. Printed card (1) Discoloring of the printed card due to overheated parts.

(2) Contact between the printed card and connector Unit Mechanism (1) Deformation

(2) Operation of the operating key switches. (3) Damage of the draw-out lever of the sub unit. (4) Discoloring and deformation of the name plate on the front panel. (5) Damage of the terminal section.

Case/cover (1) Damage of the cover. (2) Stain of the cover. (3) Clouding of the cover. (4) Damage of the lock lever of the cover. (5) Damage of the operating buttons of the cover. (6) Operation of the operating buttons of the cover. (7) Damage of the terminal section.

Others Invasion of foreign matters including dust and iron chips.

Page 58

JEP0-IL9432 58

8.2 Characteristic test

8.2.1 Precautions in testing

(1) Standard test conditions

Ensure the following test conditions whenever possible:

Note that carrying out a test under an environment that significantly differs from the following

conditions may produce a incorrect result.

- Ambient temperature : 20C10C

- Rated frequency : 5%

- Waveform (AC) : 2% (distortion ratio)

- Auxiliary power supply voltage : rated voltage 2%

(2) Characteristic control point

See the section 3 Characteristics.

The characteristic control point refers to the characteristic of a relay unit only. Note that, when a

characteristic test is carried out on a relay system connected with external equipment such as CT

and ZCT, the result obtained would be a combined characteristic added with the fluctuation of the

external equipment.

For special control in terms of a specific control point (for instance, using the operation setting), first

carry out a test at Characteristic control point at the time when the relay is received or put in service

to determine the acceptance/rejection. Thereafter, perform another test at each control point, so that

the data obtained can be used for future reference.

(3) Changing setting

Change the setting according to the section 6 Handling.

Please pay attention that the setting item of DIF test (515) should be set ON when you carry out

characteristic test. Because this relay has continuously monitoring function of differential current, so

that the monitoring abnormality (0017) will occur when current applied on. The DIF test LED (yellow)

will become on when setting. And do not forget to set the DIF test (515) OFF after finishing the

characteristic test.

(4) Operation judgment

Determine the operation currents and time and other values of the relay unit basically by turning on

and off the corresponding output relay contact of each element.

(5) Determination of 2-terminal biased differential characteristic

As the determination condition, let the outflow current (I2) be tap value (IT) 200%, and let the inflow

current (I1) raise slowly from tap value (IT) 200%, determine the operation value. Please calculate

the bias based on the determined operation value according to the following formula.

[ ]% 100 I

I-I =

(6) Determination of differential overcurrent element operation value

When you want to determine the differential overcurrent operation value, please set the operation

setting of differential element LOCK so that the relay will not response to the differential current.

And do not forget to set the setting value with original one after finishing the determination.

Page 59

JEP0-IL9432 59

(7) The calculation method of current value in case of the matching tap IT1 setting and IT2setting is

different.

As described in the item 3 [Characteristics], the testing condition is IT1=IT2 and the matching tap

setting is minimum value.

However, in case of IT1 and IT2 is not equal, please calculate the current as following manner.

( Please refer to item 4.1(2) biased differential about calculation of current inside of the relay.)

The biased differential = differential current/ restraining current

| I 1 I n /IT1 I 2 I n /I T2 | I 1 I n /IT1 | or |I 2 I n /I T2 whichever is greater

In: Rated current, : Setting value of the biased differential

In case of I1>I2, the value of I2 for testing should be 200% of matching tap T1 which is the fixed value.

| I1In/IT1I2In/IT2

| I1In/IT1| According to the above equation, I1=I2IT1/IT21/(1-)

The criteria for evaluation for the testing results as below should be based on 2 cases in which value

of is changed to (5%) and (5%).

In case of = 20%

Lower limit of criteria

I1=I2IT1/IT2(1 /(1-0.15))=2.353IT1

Upper limit of criteria

I1=I2IT1/IT2(1 /(10.25))=2.667IT1

M at

ch in

g ta

D iff

er en

tia l

R es

tra in

in g M

at ch

in g

ta p

Page 60

JEP0-IL9432 60

8.2.2 Characteristic test

(1) Test circuit

Connect the external wiring referring to the AC input circuit diagram shown below:

a. Biased differential characteristic

A-17

Voltage

The example of A-phase

CAC1-A01D2

Phase Terminals of primary windings

Terminals of secondary windings

A-phase A-17~A-18 A-11~A-12 B-phase A-19~A-20 A-13~A-14 C-phase A-21~A-22 A-15~A-16

A-18

A-11

A-12

AC moving-iron current meter

Class 0.5

A ~

b. Phase characteristic

A-17 Voltage

CAC1-A01D2

A-18

The example of A-phase

A-11

A-12

Phase meter

Voltage

AC moving-iron current meter

Class 0.5 A ~

A ~

A ~ ~

c. 2nd harmonic blocking characteristic

A-17

Voltage

CAC1-A01D2

A-18

IAC

IDC

DC moving-coil current meter

Class 0.5

Example of A-phase

A ~

IAC: SIN wave current IDC: Half wave rectifier current

(%) 100 I

2 +I 2

I 3 2

= I I

DCAC

Page 61

JEP0-IL9432 61

(2) Test items and characteristic control point

a. Forced operation test

See Front control panel operational procedure in the section 6 Handling.

b. Operation value test

See the item Operation and reset values in the section 3 Characteristics.

c. Operation time test

See the item Operation time in the section 3 Characteristics.

d. Reset time test

See the item Reset time in the section 3 Characteristics.

9 Maintenance 9.1 Daily inspection

Take every opportunity to carry out the following inspection:

- Check that the cover is not damaged and is attached properly.

- Check that no dust or iron chips have invaded into the unit.

- Check that the cover is not clouded notably.

- Check that abnormal noise is not generated.

- Check that the RUN LED lamp is lit.

9.2 Periodical inspection

It is recommended to carry out periodic inspections to check the relay for proper function.

For periodical inspections, perform the appearance inspection and characteristic test in accordance with

the section 8 Test.

Page 62

JEP0-IL9432 62

10 Ordering The product and specification shown in this manual may subject to changes (including specification

change and production suspend) without notice. It is advisory to inquire the nearest Mitsubishi Electric s

branch or sales office, if required, to confirm that the latest information is given in the manual, prior to

placing an order.

Notify the following items when placing an order. Item Example of orderRemarks

Model CAC1-A01D2For more information, see the section 2 Rating and specification.

Frequency 50 HzSelect 50Hz or 60Hz. Rating Phase current: 5AFor more information, see the section

2 Rating and specification.

Communication card

One of the followings can be selected: a. CC-Link communication card (Manual No.:

JEP0-IL9517, JEP0-IL9418) b. No communication card

Only purchasing a communication card separately will allow customer to add the communication facilities. If customer does not need the communication facilitates at the time of introducing the system, just purchase the relay unit without communication card. Customer can add the communication facilities whenever he/she needs to introduce them. This will help decrease the initial cost and upgrade the system in stages.

Direct communication application

PC-DISW HMI software

By connecting PC with relay via the direct communication port (as standard equipment located on the relay front panel, local operation and monitoring are enabled as same as the remote operation and monitoring.

11 Guarantee 11.1 Guarantee period

The guarantee period of this product should be one year after delivery, unless otherwise specified by

both parties.

11.2 Scope of guarantee

When any fault or defect is detected during the period of guarantee and such fault or defect is proved to

be caused apparently at the responsibility of MITSUBISHI ELECTRIC CORPORATION, the defective

unit concerned will be repaired or replaced with substitute with free of charge.

However, the fee for our engineer dispatching to site has to be covered by the user.

Also, site retesting or trial operation caused along with replacing the defect units should be out of scope

of our responsibilities.

It is to be acknowledged that the following faults and defects should be out of this guarantee.

When the faults or defects are resulted from the use of the equipment at the range exceeding the

condition/environment requirements stated in the catalogue and manual.

Page 63

JEP0-IL9432 63

When the faults or defects are resulted from the reason concerning without our products.

When the faults or defects are resulted from the modification or repair carried out by any other entity

than MITSUBISHI ELECTRIC CORPORATION.

When the faults or defects are resulted from a phenomenon which can not be predicted with the

science and technology put into practical use at the time of purchase or contract

In case of integrating our products into your equipment, when damages can be hedged by the proper

function or structure in the possession of your equipment which should be completed according to the

concept of the de fact standard of industry.

In case of that the faults or defects are resulted from un-proper application being out of instruction of

MITSUBISHI ELECTRIC CORPORATION.

In case that the faults or defects are resulted from force majeure such a fire or abnormal voltage and

as an act of God such as natural calamity or disaster.

11.3 Exclusion of loss in opportunity and secondary loss from warranty liability

Regardless of the gratis warranty term, MITSUBISHI ELECTRIC CORPORATION shall not be liable for

compensation of damages caused by any cause found not be the responsibility of MITSUBISHI

ELECTRIC CORPORATION, loss in opportunity, lost profits incurred to the user by failures of

MITSUBISHI ELECTRIC CORPORATION products, special damages and secondary damages whether

foreseeable or not, compensation for accidents, and compensation for damages to products other than

MITSUBISHI ELECTRIC CORPORATION products and other tasks

11.4 Applications of products

The user is requested to confirm the standards, the regulations and the restrictions which should be

applied, in case of utilizing products described in this catalogue and another one in combination.

Also, the user is requested to confirm the suitability of our products to your applied system or

equipment or apparatus by yourself.

MITSUBISHI ELECTRIC CORPORATION shall not be liable for any suitability of our products to your

utilization.

This MITSUBISHI ELECTRIC CORPORATION products described in the catalogue have been

designed and manufactured for application in general industries, etc. Thus, application in which the life

or an asset could be affected by special application such as medical system for life-sustaining, in

nuclear power plants, power plants, aerospace, transportation devices(automobile, train, ship,

etc )shall be excluded from the application. In addition to above, application in which the life or an

asset could be affected by potentially chemical contamination or electrical interference and also in

which the circumstances and condition are not mentioned in this catalogue shall be excluded from the

application.

Note even if the user wants to use for these applications with users responsibility, the user to be

requested to approve the specification of MITSUBISHI ELECTRIC CORPORATION products and to

contact to the technical section of MITSUBISHI ELECTRIC CORPORATION prior to such applications.

If the user applies MITSUBISHI ELECTRIC CORPORATION products to such applications without any

contact to our technical section, MITSUBISHI ELECTRIC CORPORATION shall not be liable for any

items and not be insured, independently from mentioned in this clause.

Page 64

JEP0-IL9432 64

In using MITSUBISHI ELECTRIC CORPORATION product, the working conditions shall be that the

application will not lead to a major accident even if any problem or fault occur, and that backup or

duplicate system built in externally which should be decided depend on the importance of facility, is

recommended.

The application examples given in this catalogue are reference only and you are requested to confirm

function and precaution for equipment and apparatus and then, use our products

The user is requested to understand and to respect completely all warning and caution items so that

unexpected damages of the user or the third party arising out of un-correct application of our products

would not be resulted.

11.5 Onerous repair term after discontinuation of product

MITSUBISHI ELECTRIC CORPORATION shall accept onerous product repairs for 7(seven) years

after production of the product is discontinued. (However, please consider the replacement of products

after 15 years have been passed from ex-work of products.)

Product supply (including repair parts) is not available after production is discontinued.

11.6 Changes in product specification

The specification given in the catalogue, manuals or technical documents are subject to change without

prior to notice.

11.7 Scope of service

The technical service fee such as engineer dispatching fee is excluded in the price of our products.

Please contact to our agents if you have such a requirement.

12 Improvement of protection function Any parts and materials applied to the protection relay have limited life time which will bring the

degradation to the relay.

The degree of degradation will be variable and depend on the purpose, period in use, applied

circumstance and unevenness on the performance of each part.

MITSUBISHI ELECTRIC CORPORATION design the relay so as to realize that the recommended

replaced duration is more them 15 years.

However, there may be some possibilities to occur some defects before reaching 15 years due to above

mentioned the degree of degradation of parts and materials being depended on the condition in use.

To prevent unwanted operation or no operation of relay due to above reasons, it is recommended to apply

the relay with self-diagnosis function and/or multiplexing relay system such as dual or duplex scheme.

Page 65

Revised in Nov. 2012

HEAD OFFICE 7-3 MA

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