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Mitsubishi Electric MDG A4V R, MDG A4V RD Manual PDF
Summary of Content for Mitsubishi Electric MDG A4V R, MDG A4V RD Manual PDF
1 JEP0-IL9559
Request
Ensure that this Instruction Manual is delivered to
the end users and the maintenance manager.
2 JEP0-IL9559
Safety precautions Before installation, operation, maintenance, and inspection, please be sure to read this instruction manual and all other attached documents thoroughly in order to work safely with the equipment. Please ensure that you fully understand the equipment, safety information, and precautions that need to be taken before working with the equipment. Safety precautions are classified as Caution.
Caution The case where a dangerous situation can arise and there is the possibility that moderate or minor injuries can occur, or property damage can take place if the equipment is handled incorrectly.
Furthermore, even with items described as Caution, there is the possibility of serious consequences depending on the situation. All of the described contents are important. Therefore, be sure to comply with them.
Caution
1. Installation and Wiring work
Caution
Ensure that the equipment is mounted and connected correctly. Otherwise, there are risks of failure, burning, or
maloperation.
Securely tighten the terminal connection screws. Otherwise, there are risks of failure and burning.
For tightening torque of screws, refer to the following Table.
Material Nominal
dia. Standard value of
torque Allowable range Place of use
Steel M3.5 1.10Nm
11.2kgfcm
0.9321.27Nm
9.512.9kgfcm Terminal block
Steel M4 1.65Nm
16.8kgfcm
1.391.89Nm
14.219.3kgfcm
Drawer fixing screw of unit-drawer type (RD type)
Steel M6 5.49Nm
56kgfcm
4.716.37Nm
4865kgfcm Fixing screw for mounting
Steel M10 26.5Nm
270kgfcm
22.630.4Nm
230310kgfcm MPD-3C bottom screw
Brass M4 0.961Nm
9.8kgfcm
0.8241.11Nm
8.411.3kgfcm
MZT primary terminal (k, ) MPD-3T terminal
The equipment must be correctly grounded using the designated grounding terminals where they exist. Failure to do so
may lead to the risk of electric shock, equipment failure, malfunction or failure to operate.
Ensure that the equipment is connected correctly in accordance with the details (e.g.: polarity or phase sequence) shown
on the connection terminals. Otherwise, there is the risk of failure, burning, malfunction, or maloperation.
All power supplies and transformers to the equipment must be of suitable capacity and rated load to avoid the risk of
malfunction and maloperation.
Be sure to return all terminal covers, protection covers to their original positions once any work is complete. If they remain
uncovered there is a risk of electrical shock.
The appropriate connectors must be used to ensure compatibility with the connector terminals to avoid the risks of failure
or fire.
When inserting subunit into the case, please ensure that there is no gap between front side of the subunit and the case.
In addition, tighten lower screw surely. If the subunit is inserted inadequately, there are risks of malfunction or generation of heat.
2. Operating and Setting
The equipment must be used within the following range limits. Otherwise, there is a risk of reducing the performance and life of the product.
Variation range of auxiliary power supply voltage Within 15 to +10% of the rated voltage
Frequency variation Within 5% of the rated frequency
Ambient temperature 20 to +60
(under the state where dew condensation or freezing does not occur)
Relative humidity 30 to 80% on daily average
Altitude 2000m or lower
The state where abnormal vibration, shock, inclination, magnetic field() are not applied
The state where it is not exposed to harmful smoke/gas, saline gas, water droplet or vapor, excessive dust or fine powder,
explosive gas or fine powder, wind & rain
() If there is a large amount of current on main circuit surrounding the relay, the operation indicator may be magnetized and
turned from black to orange color. In that case, please shield back of the relay by iron plate.
3 JEP0-IL9559
Caution
The equipment must only be operated and handled by qualified personnel. Otherwise, there are risks of electric shock,
injury, failure, malfunction, and maloperation.
Handling and maintenance of the equipment must only be carried out after gaining a thorough understanding of the
instruction manual. Otherwise, there is the risk of electric shock, injury, failure, malfunction, or maloperation.
While energized, do not remove any components other than those which have been designated. Otherwise, there is a risk
of failure, malfunction, or maloperation.
While energized, do not draw out the internal unit (subunit). Otherwise, there is a risk of electric shock, injury, failure,
malfunction, or maloperation.
When changing the setting value during the energized state, ensure that all trip circuits are locked in order not to operate.
Otherwise, there is a risk of malfunction.
Use in rated range. Otherwise, there is a risk of malfunction.
3. Maintenance and Inspection
We recommend that any tests or inspections are carried out under the following conditions, as well as any additional conditions described in the instruction manual.
Ambient temperature 2010
Relative humidity 90% or less
External magnetic field 80A/m or less
Atmospheric pressure 86106103 Pa
Mounting angle Regular direction 2
Frequency Rated frequency 1%
Waveform (in the case of AC) Distortion factor: 2% or less
Effective value of higher harmonics only
Distortion factor 100(%)
Effective value of fundamental wave
AC component (in the case of DC) Ripple factor: 3% or less
Max. value Min. value
Ripple factor 100(%)
Average value of DC
Auxiliary power supply voltage Rated voltage 2%
Caution
The equipment must only be operated and handled by qualified personnel. Otherwise, there are risks of electric shock,
injury, failure, malfunction, and maloperation.
Handling and maintenance of the equipment must only be carried out after gaining a thorough understanding of the
instruction manual. Otherwise, there is the risk of electric shock, injury, failure, malfunction, or maloperation.
When replacing the equipment, use a product of same model, rating, and specifications. Otherwise, there is the risk of
failure or fire.. If any other product is to be used, the manufacturer must be consulted.
Do not exceed the overload capacity for voltage and current. Otherwise,equipment failure or fire could occur.
Do not touch any live parts, such as terminals, etc. Otherwise, there is a risk of electric shock.
Do not clean the equipment while energised. When the cover needs to be cleaned, make use of a damp cloth.
4. Transportation
Transport the equipment in the correct orientation.
Do not apply excessive shock and/or vibration as this could affect the performance and life of the product.
5. Storage
The storage environment shall comply with the following conditions. Otherwise, there is a risk of reducing the performance and life of the product.
Ambient temperature 20 to +60
(under the state where dew condensation or freezing does not occur)
Relative humidity 30 to 80% on daily average
Altitude 2000m or lower
The equipment must not be exposed to abnormal vibration, shock, inclination, or magnetic fields.
The equipment must not be exposed to harmful smoke/gas, saline gas, water droplets or vapor, excessive dust or fine
powder, explosive gas or fine powder, wind & rain.
6. Repair and Modification
When carrying out repair and/or modification, please consult with the manufacturer in advance. We will not take any
responsibility for any repair and/or modification (including software) which has been carried out without prior consent.
7. Disposal
Disposal must take place in accordance with the applicable legislation
4 JEP0-IL9559
Guarantee 1. Guarantee period
The guarantee period of this product should be one year after delivery, unless otherwise specified by both
parties.
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.
(1) 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.
(2) When the faults or defects are resulted from the reason concerning without our products.
(3) When the faults or defects are resulted from the modification or repair carried out by any other entity than
MITSUBISHI ELECTRIC CORPORATION.
(4) When the faults or defects are resulted from a phenomenon which cannot be predicted with the science
and technology put into practical use at the time of purchase or contract
(5) 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.
(6) In case of that the faults or defects are resulted from un-proper application being out of instruction of
MITSUBISHI ELECTRIC CORPORATION.
(7) 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.
3. Exclusion of loss in opportunity and secondary loss from warranty liability
Regardless of whether in guarantee period or not, 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.
4. Applications of products
(1) The user is requested to confirm the standards, the regulations and the restrictions which should be applied,
in case of utilizing this product 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.
(2) This product has 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 manual 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.
(3) In using this 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 based on the importance of facility, is recommended.
(4) The application examples given in this manual are reference only and you are requested to confirm function
and precaution for equipment and apparatus and then, use our products.
(5) 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 incorrect application of our products would
not be resulted.
5 JEP0-IL9559
5. Onerous repair term after discontinuation of product
(1) MITSUBISHI ELECTRIC CORPORATION shall accept onerous product repairs for 7 years after production
is discontinued. (However, the product which was made over 15 years is recommended to replace.)
(2) Product supply (including repair parts) is not available after production is discontinued.
6. Changes in product specification
The specification given in the catalogue, manuals or technical documents are subject to change without prior
notice. 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.
6 JEP0-IL9559
MDG-A4 Series Directional Earth Fault Relay [Standard: JIS C 4609 (1990)]
Features
1. Directional earth fault relay for EVT correspondence.
2. Wide setting range and fine setting steps enable
flexible protection coordination.
3. Reset method of output contacts can be switchable
between auto-reset and self-hold.
4. The fault value record function is installed.
5. Good operability and visibility design is adopted.
The numerical display turns on for 3 seconds when the
setting value is changed, which enables to check
setting values easily.
6. Panel cutout is the same as previous MELPRO-A series
and E series.
Ratings and Specifications
Type name MDG-A4V-R MDG-A4V-RD
Style No. 105PGA 520PGA
Ratings
Zero-sequence current 0.2A (MZT type ZCT primary)
Zero-sequence voltage 110V/190V (switchable by input terminals)
Frequency 50/60Hz (switchable)
Auxiliary power supply AC110V (Range: 90120V)
Settings
I0 Operation value 0.1(*)-0.2-0.4-0.6-0.8-1.0A (ZCT primary value)
V0 Operation value LOCK(*)-2-2.5-3-4-5-6-7-7.5-8-910%
(Ratio to V0 voltage on single-phase perfect fault: 100%=110V/190V)
Operating time Instantaneous(*)-0.2-0.3-0.4-0.5-0.6-0.7-0.8-0.9-1.0s
Using
condi
tion
Frequency 50Hz(SW1-ON) - 60Hz(*)(SW1-OFF)
Output contact Self-hold(SW2-ON) Auto-reset(*)(SW2-OFF)
Display
Self-monitoring The "RUN" indicator (green-color) is lighted in normal condition.
Operation indicator The indicator turns from black into orange color when the protection element
is put into operation. (Manual resetting type)
Numerical display
Indication item Range
V0 measurement 1.012.0%
I0 measurement 0.050.09A, 0.11.5A
Phase measurement 0359(V0 standard, I0 lag display)
V0, I0 Pickup U.-I.
V0 setting Lo.(1),2.010%
I0 setting 0.11.0A
Operating time setting In.(2),0.21.0s
Frequency setting 50,60Hz
Output contact setting Ho.,FU.
Fault record of V0 2.040.0%
Fault record of I0 0.11.5A
Fault record of phase 0359(V0 standard, I0 lag display)
Clear fault record O.K.
TEST (Forced operation) F.O.
1 "Lo." means LOCK setting (the protection element is locked).
2 "In." is the display for instantaneous setting.
Test button
(Forced operation)
By turning the indicator select switch to "TEST" and pushing "TEST" button
for 2 seconds or more, output contact can be forced to operate (except for
the case of LOCK setting).
Power
consumption
V0 circuit 0.1VA at rated voltage
Power supply Normal3.0VA Operating4.0VA
Case
(Munsell color)
Unit-fixed type
(Fig. 7-9)
(0.6B7.6/0.2)
Unit-drawer type
(Fig. 7-10)
(0.6B7.6/0.2)
Mass Approx. 0.6kg Approx. 0.7kg
(*) shows factory setting.
Note) It is necessary to combine MZT type ZCT and commercially available EVT (compliance with JEC-1201) with MDG-A4V
relay.
Don't combine other transformers with this relay.
7 JEP0-IL9559
Characteristics (MDG-A4V type relay MZT type ZCT combination) Item Characteristics
Standard use conditions
Ambient temperature: 20 to +60 (Under the state where dew condensation or freezing does not occur)
Relative humidity: 30 to 80% on daily average
Altitude: 2000m or lower
The state where abnormal vibration, shock, and inclination are not applied.
The state where it is not exposed to harmful gas, excessive dust, and water droplet or vapor.
Operation value characteristics
I0 Setting: Zero-sequence voltage V0 = 2%, Operating time T = Instantaneous Input: V0 = 150% of setting value
Criteria: Within 10% of each setting current at the maximum sensitivity angle
V0
Setting: Zero-sequence current I0 = 0.1A, Operating time T = Instantaneous Input: I0 = 150% of setting value
Criteria: Within 10% of each setting voltage at the maximum sensitivity angle
V0 setting (%) 2 2.5 3 4 5 6 7 7.5 8 9 10
190V terminal input (V) 3.8 4.75 5.7 7.6 9.5 11.4 13.3 14.25 15.2 17.1 19
110V terminal input (V) 2.2 2.75 3.3 4.4 5.5 6.6 7.7 8.25 8.8 9.9 11
Reset value characteristics
90% or more of operating value (Both I0 and V0)
Phase characteristics
Setting: Zero-sequence current I0 = 0.1A, Zero-sequence voltage V0 = 2%, Operating time T = Instantaneous Input: I0 = 1000% of setting value, V0 = 150% of setting value
I0 operating area (V0 standard):
Phase setting Max. sensitivity angle
45
Lag 4510
Lead 13510
0.2 0.4 0.6 0.8 1.0A
90 90
180
0
35
55
125
145
VO
Max. sensitivity angle 45
Lead Lag
Operation
area
Non-operation
area
Operating time characteristics
Input: V0 = 0 150% of setting value, I0 = 0 130% and 400% of setting value
(at the maximum sensitivity angle)
Current
Time setting
Ratio to the setting current
130% 400%
Instantaneous 50100ms 50100ms
0.2s 0.10.3s 0.10.2s
0.3s or more 20% of setting time 10% of setting time
Resetting time characteristics
Input: V0 = 150% of setting value 0, I0 = 130% and 400% of setting value 0
Criteria: 250ms50ms
Overshoot time characteristics
Setting: Zero-sequence current I0 = 0.1A, Zero-sequence voltage V0 = 2%, Operating time T = 0.2s Input: I0 = 400% of setting value, V0 = 150% of setting value (at the maximum sensitivity angle)
Applied time: 0.05s
Criteria: The relay shall not operate.
Variation characteristics of auxiliary power supply voltage
Input: Auxiliary power supply = AC90VAC120V
Criteria: Within 10% of I0 and V0 operation values at rated voltage
Temperature characteristics
Ambient temperature: -20, +60
Criteria:
Operation values of I0 and V0: Within 20% of operation values at 20
Operating time: Within 20% of operating time at 20
Phase characteristics: Within 15of operating phase at 20
8 JEP0-IL9559
Vibration
Frequency (Hz)
Peak-to-peak amplitude mm (Acceleration m/s2)
Vibration
time (s)
Setting: Minimum operation value and minimum operating time
Input: Rated auxiliary power supply I0 and V0 = 0
Criteria: No malfunction and no
abnormal indication
Forward/
backward Right/left Up/down
10 5 (10) 2.5 (5) 30
16.7 0.4 (2) 600
Shock Maximum acceleration: 300m/s2
Direction: 3 directions in forward/backward, right/left, and up/down
Criteria: No abnormality when applying two shocks in each direction
Insulation resistance
Test circuit: Between all circuits and earth (E terminal), between separate circuits (except for I0-V0
circuits), and between the poles of contacts
Criteria: More than 10M by DC500V megger.
(Note) The test is held under the condition that relative humidity is less than 80%.
Withstand voltage Between all circuits and earth (E terminal): AC2000V, for 1 minute
Between separate circuits (except for I0-V0 circuits): AC2000V, for 1 minute
Between the poles of contacts (a11-a12, a21-a22): AC1000V for 1 minute
Lightning impulse withstand voltage
Apply standard waveform (1.2/50 s) to positive/negative pole for 3 times respectively.
Between ZCT primary and earth: 60kV
Between all circuits of the relay and earth (E terminal): 4.5kV
Between EVT/ZCT secondary and control circuit: 4.5kV
Between contact terminal and power supply terminal: 3.0kV
Between terminals of power supply: 3.0kV
Noise-proof
Apply damped oscillatory wave prescribed in JIS C 4609 for 2 seconds.
Between EVT/ZCT secondary and earth (E terminal)
Between power supply terminal and earth (E terminal)
Between terminals of power supply
Between contact terminal and earth (E terminal)
Setting: Minimum operation value and minimum operating time
Input: Rated auxiliary power supply, I0 and V0 = 0
Criteria: No malfunction
Radio disturbance
Intermittently irradiate radio waves to the front panel of the relay with a transceiver of 150MHz or 400MHz
band (5W output) from a distance of 0.5m.
Setting: Minimum operation value and minimum operating time
Input: Rated auxiliary power supply, I0 and V0 = 0
Criteria: No malfunction
Contact capacity
Making
(Closing)
DC110V 15A (L/R=0ms)
DC220V 10A (L/R=0ms)
AC110V 10A (cos=0.1)
Breaking
(Opening)
DC110V 0.3A (L/R=7ms)
AC110V 5A (cos=0.1)
AC220V 1A (cos=0.1)
Note) For details, refer to JIS C 4609 (1990).
9 JEP0-IL9559
Structure
Fig. 7-1 Structure of MDG-A4 series (front view)
Internal connection diagram
X0
Continuous monitoring
Power circuit monitoring
Operation indicator
RUN indicator
X0
Output contact
X1
Z1+
I0
Z2
Output contact
Directional
assessment
I0
Level assessment
P1
P2
Auxiliary power supply
a 190V
V0
f+
a 110V
Power supply
V0
Level assessment
X1
a11
a12
a21
a22
E
RD-type has shorting bar in I0 circuit.
Output
contact
Output
contact
Fig. 7-2 Internal connection diagram
Numerical display LED Following item is displayed by
indicator select switch
setting.
V0, I0, and phase measurement
V0, I0 pickup
Setting value
Fault record
Clear fault record
Forced operation (test)
RUN indicated LED (Green) It shows the result of self-
monitoring. It lights up in
normal condition.
Indicator select switch The numerical display shows
according to this selection
switch. Don't leave this
switch with halfway state.
Setting switches for operation value and time Set the setting values. The
black part is equal to maximum
value, but the numerical
display is turned off.
Don't leave the switches with
halfway state.
Setting switches for using condition Don't use any tool with a sharp
point when the switches are set.
(It may cause damage to the switch
lever.) SW1 Frequency
ON 50Hz OFF 60Hz
SW2 Output contact
ON Self-hold (Ho.) OFF Auto-reset (FU.)
Factory settings are set to a
default of OFF.
Operation indicator The indicator turns from black into
orange color when the protection element
is put into operation.
Operation indicator reset lever Move this lever up and down, then the operation
indicator resets.
(Note) Don't pull the lever strongly.
Test button By turning the indicator select
switch to "TEST" and pushing
"TEST" button for 2 seconds or
more, output contact can be
forced to operate (except for
the case of LOCK setting).
CPU reset button While this button is pressed,
the relay function is locked
and the RUN indicated LED is
turned off. In addition, the
output contact is reset from
self-hold state.
10 JEP0-IL9559
Operating Description
1. Protection function
The power supply can be derived from VT secondary.
Set using condition switches according to your
using condition (frequency and output contact).
Zero-sequence voltage input is supplied from
secondary output of commercially available EVT
(compliance with JEC-1201).
Zero-sequence current input is supplied from
secondary output of MZT type ZCT combined with the
relay.
If both zero-sequence current and zero-sequence
voltage is greater than or equal to the setting
value, and if the phase difference between them
is within the operating area, the operation timer
starts. The relay actuates the output contact and
operation indicator after a preset time of the
operation timer.
After the relay operation, if zero-sequence
current or zero-sequence voltage falls below the
setting value, or if the phase difference between
them is out of the operating area, the output
contact will be in the state set by the using
condition setting switch (auto-reset or self-hold).
The operation indicator keeps the operation status
(orange color). To reset the indicator, move the
reset lever up and down.
2. RUN display (Self-monitoring function)
This relay monitors control voltage, electric
circuit, and program data at all time. The RUN LED
(green) lights up in the normal condition.
In the abnormal condition, the RUN LED goes out and
the error message is displayed on the
numerical display LED, with the output contact
locked.
3. Numerical display function
By switching the position of the indicator select
switch, following items can be displayed on the
numerical display LED.
V0 voltage measurement
The display shows the value of zero-sequence
voltage. The display range is from 1.0% to 12.0%.
(If input voltage is less than 1.0%, the display
goes out. If input voltage is more than 12.0%, the
error message .. is displayed.)
Here, "100%" denotes complete single-phase fault,
that is, the rated input voltage of the relay
(110V/190V).
This function makes it possible to measure the
residual V0 voltage in sound condition.
I0 current measurement
The display shows the value of zero-sequence
current. The display range is from 0.05A to 1.5A.
(If input current is less than 0.05A, the display
goes out. If input current is more than 1.5A, the
error message .. is displayed.)
Phase measurement
The display shows the phase of zero-sequence
current relative to the zero-sequence voltage.
The display range is 0to 359(lag).
V0, I0 pickup
When input zero-sequence voltage and zero-sequence
current exceeds setting value, . . is
displayed.
(V0 pickup: . , I0 pickup: .)
When the indicator select switch is set to "PICKUP",
is displayed.
This function can be used for operation value tests.
Setting value
It displays the setting condition of the relay
including V0 value, I0 value, and operating time
setting.
Frequency setting
It displays the setting condition of frequency in
accordance with the setting switch of SW1.
Output contact setting
It displays the setting condition of output contact
in accordance with the setting switch of SW2.
The setting is self-hold, the display shows
..
The setting is auto-reset, the display shows
..
4. Fault record function
Display of fault records
When a fault occurs, the relay outputs the
operating signal, and at the same time the input
values of zero-sequence voltage, zero-sequence
current and phase are recorded. When the indicator
select switch is set to the position of each fault
record, the records are displayed starting from
the latest record to the oldest one at
approximately 2 second intervals. The relay can
save the newest five phenomena.
The records are saved in the non-volatile memory,
therefore the records can be read again after
shutting the power off.
Note that the fault record may not be saved if the
auxiliary power supply is turned off soon after
the relay operation.
Clearing of fault records
Set indicator select switch to "CLEAR FAULT REC."
and hold for 5s or more, then .. is displayed
and all of the fault record are cleared.
5. Display function of setting change
When a setting is changed, the setting value after
changing is displayed for approx. 3s preferentially.
11 JEP0-IL9559
External connection diagram (Example)
Application value of EG-5 type
current limiting resistance.
System voltage V0 EG-5
Rating style No.
6.6KV 3.3KV
190V 191PHA 25 50
110V 192PHA 8 16
1. This figure shows the connection of V0 = 190V.
2. For MDG-A4V-RD type relay, please connect terminals between Z2 and f+ with 2mm2 cable when sub-unit of the relay is drew out.
3. Don't connect the "" terminal of MZT type ZCT to ground.
Connect line.
Fig. 7-3 External connection diagram
AC110V
Z1+
Z2
P1 P2
E
f+ a110V a190V ED
MDG-A4V
AC110V
Z1+
Z2
P1 P2
E
ED
MDG-A4V
AC110V
Z1+
Z2
P1 P2
E
ED
MDG-A4V
AC110V
P1 P2
E
ED
MVG-A4V
EA
E
EA
O
a b c f
U V W
EG-5
ED
Earthed voltage transformer
(EVT)
ZCT
MZT
CB
ZCT
MZT
CB
ZCT
MZT
CB
f+ a110V a190V f+ a110V a190V f+ a110V a190V
12 JEP0-IL9559
Operation value settings and using condition settings
1. Operation value settings
The operation value settings should be set with due
consideration given to various conditions of the systems,
such as residual voltage and current, and protection
coordination.
In regard to V0 setting, set it more than V0 measured value
in order to avoid unwanted operation.
2. Using condition settings
For all using condition setting switches, factory settings
are set to a default of OFF.
(1) Frequency (SW1):
50Hz = ON, 60Hz = OFF
(2) Output contact (SW2):
Self-hold = ON, Auto-reset = OFF
Precautions for design and installation
Connection
(1) Test terminals of ZCT: The test terminals of ZCT (kt
and t) are used only for the operation test and
keep them open after the test. (Do not short the
test terminals.)
(2) Wiring material: Since the MDG-A4V relay is a high
sensitivity digital type relay, it is necessary to
suppress surge and noise from the main circuit and
other lines.
Therefore, use 2-core shielded cables with a
diameter of 0.75mm2 or more to connect to the Z1-Z2
terminals of the relay (ZCT circuit), and connect
the shield to E terminal of the relay or D-class
grounding. The cable burden shall be 5 or less for
both ways. (In the case of 0.75mm2, one way is about
100 meters.)
(3) Secondary wiring of ZCT: The secondary terminal (k,
), and the test terminal (kt, t) are double nuts.
The wiring is connected between the nuts. When
connecting, do not loosen the inner side (ZCT side)
nut.
(4) Polarity: Polarity is very important to this relay.
Please pay attention to polarity for connecting from
ZCT and ZVT, and grounding point is also important.
(5) Shield grounding of power cable: When an electric
power cable is used at the primary side of ZCT, pay
attention to the shield grounding as shown in
JEAC8011 regulations.
(6) Handling of power cable: Please handle with care not
to damage the outer sheath of ZCT primary cable.
The bending radius should be more than 10 times the
conductor outer diameter. Please locate the three-
phase cable symmetrically in the ZCT through hole.
(7) Grounding of EVT: Please connect the "O" terminal
and "E" terminal of EVT to A-class grounding.
(8) Grounding of MDG-A4V relay: Because the Z2 terminal
and f+ terminal are internally short-circuited,
ground only one point of the V0 circuit.
(9) Connection to ZCT: Only one ZCT can be connected to
one MDG-A4V relay. If two or more ZCTs are connected
in parallel, correct detection may not be possible.
Caution on withstand voltage test
(1) After the relay is mounted into the panel, when the
test is performed between the high-voltage circuit
and the earth/the low-voltage circuit, be sure to
check that the secondary side of VT and ZCT are
grounded.
(2) When the test is performed between the low-voltage
circuit and the earth, be sure to disconnect the
secondary side of VT and ZCT from the earth.
13 JEP0-IL9559
Handling precautions
1. Panel mounting
Be sure to connect the "E" terminal of the relay to D-
class grounding.
The relay of unit-drawer type (RD type) can be drawn
out from the case.
2. Use and operation
About the setting switches for using condition, factory
settings are set to a default of OFF. So it is necessary
to set the switches according to the conditions.
Please refrain from changing the setting value during
operation, since unwanted operation may occur. However,
if the setting change is unavoidable, please press the
CPU reset button in order to lock the relay function.
Don't leave rotary switches with halfway (indefinite)
state.
The RUN LED lights up in the normal condition when the
rated auxiliary power supply is input. If it still turns
off when the auxiliary power supply voltage exceeds 85V,
please contact our local agent and branch office since
the relay may fail.
A relay test is carried out sufficiently before shipment,
but at the following cases, it is recommended the test
should be carried out again.
a. When the products are delivered and unpacked
b. At the time of starting operation of equipment
c. At the time of periodic inspection (Usually once a
year)
1. At the time of testing
The input waveform should be a sine wave with little
distortion.
During the test, set the position of the indicator
select switch to "V0 MEASURE", "I0 MEASURE", "PHASE
MEASURE", or "PICKUP". Set the other setting switches
according to the test conditions of the operating
characteristic control point.
If user-defined control point is specified (e.g.
accuracy of relay characteristic is controlled at
service conditions), execute the test at the
manufacturer-defined characteristic control point
before in-service operation and then check accuracy of
the relay. After that, execute the test at the user-
defined control point, and use this data as a later
reference.
Perform the test in combination with ZCT (MZT type).
Otherwise, direct input to the relay may cause burning
out.
2. Withstand voltage test
a. Apply 2000V AC (commercial frequency) between all
circuits and earth (E terminal) for one minute, and
make sure that there is no problem.
Voltage applied terminals
b. Apply 2000V AC (commercial frequency) between separate
circuits for one minute, and make sure that there is
no problem.
Voltage applied terminals
Note) Never apply a test voltage between following circuit:
Test
P1 P2
a11 a21 a22 a12
P1 P2
E
Z2 a21 a22 P2
a11 a12 Z1 P1 a
110V
f+
a 190V
a11 a21 a22 a12
a11 a21 a22 a12
P1 P2
Z1 Z2
Z1 Z2
a 110V
a 190V f+
a 110V
a 190V f+
Z1 Z2 a
110V a
190V f+
14 JEP0-IL9559
3. Operation characteristics test [MDG+ZCT combination]
In the field test, please apply I0 current from the primary side of ZCT (or test terminal: kt, t).
On the other hand, please apply V0 voltage to the input terminal of the relay directly.
The example of test circuit is shown in Fig. 7-4.
When this test is carried out, be sure that the main circuit is turned OFF.
When the rated power supply voltage is applied, the RUN display LED (green) lights up. This indicates that the relay
works properly.
By turning the indicator select switch to "TEST" and pushing "TEST" button for 2 seconds or more, output contact
can be forced to operate (except for the case of LOCK setting).
4. Operation characteristic control point
Perform the test periodically according to the following test conditions and criteria.
Test item Test condition
Criteria I0 setting V0 setting Time setting Input
I0 operation
value Each setting Minimum Instantaneous
V0 = Setting150%
at the max.
sensitivity angle
10% of setting
value
V0 operation
value Minimum Each setting Instantaneous
I0 = Setting150%
at the max.
sensitivity angle
10% of setting
value
Phase
characteristics Minimum Minimum Instantaneous
V0 = Setting150%
I0 = Setting1000%
Lag: 3555
Lead: 125145
Operating time
characteristics Minimum Minimum
Instantaneous V0 = Setting150%
I0 = Setting130%
Applied at the same
time at the max.
sensitivity angle
50100ms
0.2s 0.10.3s
0.3s or more 20% of setting
time
Tripping coil
52a
A
0~1000 20
R2 R1
V
AC100
/110V
To
To
0~50V
Voltage regulator
P1 P2 P1, P2 terminal of MDG relay
SW
ZCT
MZT K
L
CB
kt
k
t
W V U AC100V
or
DC100V
MDG-A4V
O
a f
Earthed Voltage Transformer
(EVT)
P1
P2
AC100/110V
a12 a11
Z1
Z2
+
+
a 190V f
Disconnect
Note) This figure shows the connection of
V0 = 190V.
In the case of V0 = 110V, change the
connection from to . a
190V a
110V
Phase meter
From
From
Fig. 7-4 Example of test circuit
15 JEP0-IL9559
Terminal layout
9 9 9 9 9 9
14
P1 a
190V a11 a12Z1 a
110V
P2 a21 a22Z2f+ E
MDG-A4V-R/RD
Do not connect to the "" terminals, or the relay may not operate properly.
Fig. 7-5 Terminal layout
Drawing out and housing operation of subunit (Unit-drawer type)
For unit-drawer type (RD type), it is possible to draw
out the subunit from the case without removing external
wiring, which makes easier to carry out inspection and
testing.
When drawing out and housing, be careful not to touch the
electrical circuit (e.g. substrate, capacitor, and
transformer) and be sure to hold the drawer handle or the
frame part when transporting. (Touching the electrical
circuit may cause electric shock or damage to the
circuit.)
Before the subunit is to be drawn out, ensure that the
following items are checked in order not to carry out the
work in hot-line condition.
Lock of the tripping circuit
Turning off the main circuit
Disconnect CT/VT circuit
Turning off the auxiliary power supply
The CT circuit is equipped with an automatic short circuit
piece so that the CT secondary circuit won't be opened
even if the relay subunit is drawn out without
disconnecting the CT circuit.
Fig. 7-6 Structures of unit-drawer type (RD type)
Connector of case
Drawer handle
(Back side)
Connector of subunit
(Back side)
Subunit
Cover (Transparent)
Drawer fixing
screw
16 JEP0-IL9559
1. Procedure of drawing out
Drawer fixing screw
Open the cover and remove the
drawer fixing screw.
Close the cover and pull out the
subunit with your finger hooked
on the drawer handle on both
sides.
Support the frame of subunit and
pull out.
2. Procedure of housing
Drawer fixing screw
Support the frame of subunit and
place the subunit in the case
along the rails.
Insert the subunit into the case
horizontally.
Open the cover and tighten the
drawer fixing screw.
Cover
Cover
17 JEP0-IL9559
Handling of the cover
1. Opening and closing
Please open the cover by placing your fingertip on the convex part in the right side of the cover
as shown in Fig. 7-7.
Fig. 7-7
2. How to replace the cover
Removing the cover
Open the cover, and lightly push up the upper side of the cover from the inner surface.
Then, remove from the protrusion of the body.
Installing the cover
As shown in Fig. 7-8, mount the holes on the upper side
of the cover to the protrusion of the body.
Then, press down lightly on the lower side of the cover
and mount to the protrusion of the body
in the same way as above.
When replacing the cover during operation, be careful not to touch the switches.
Fig. 7-8
Enlarged view of the upper side
Cover
Body
18 JEP0-IL9559
External dimensions and Panel cut-out
152
1 6 7
3
8 3 . 5
8 3 . 5
14-M3.5 screw
32
1 3 8
136
104
13
2-M6 screw
124
1 2 4
140142
2-7 hole Minimum pitch 180
M i n i m u m p i t c h
1 8 0
Fig. 7-9 MDG-A4V-R (Unit: mm)
152
1 6 7
3
8 3 . 5
8 3 . 5
14-M3.5 screw
32
1 3 8
136
104
2-M6 screw
4 6
11
36
124
1 2 4
140142
2-7 hole Minimum pitch 182
M i n i m u m p i t c h
1 8 0
Fig. 7-10 MDG-A4V-RD (Unit: mm)
Improvement on the reliability of protection function
Any parts and materials applied to the protection relay have limited lifetime which will bring the degradation to
the relay. The degree of degradation will be variable depending on the purpose, aging, usage environment, and
unevenness on the performance of each part.
Our company designs its products so that the recommended renewal period is 15 years or more.
However, there may be some possibilities to occur any failures before reaching 15 years due to above reasons.
To prevent unwanted operation or no operation of relay, it is recommended to apply the relay with self-diagnosis
function and/or multiplexing relay system such as dual or duplex scheme.
Same as the center of panel cut-out
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