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EDCS 8150 INSTRUCTION MANUAL v2 30 130724

EDCS-8000 Series of Power System Integrated
Automatic Device

EDCS-8150 STATION TRANSFORMER PROTECTION
AND MONITORING DEVICE

INSTRUCTION MANUAL
V2.30

Chongqing New Century Electrical Co., Ltd



VERSION ANNOUNCEMENT
Copyright: Chongqing New Century Electrical Co., Ltd
This instruction is applicable to the protection program of the following version:
EDCS-81502 Station transformer protection and monitoring device V2.**.
EDCS-81503 Station transformer protection and monitoring device V2.**.
UPDATING RECORD OF INSTRUCTION’S VERSION
NO.


Instruction Version

Updating abstract

Updating date

1
2
3
4
5
6
7
8
9
10



The instruction and production may have a little change, please check the practical
production and the instruction’s version.



Technical support: Tel:(023)68694458



The second version prints in 10, 2010.



More information please access http://www.cqnec.com.cn
HU

Fax:(023)68626689

U



IMPORTANT INSTRUCT
Thank you for purchased production made by Chongqing New
Century Electrical Co., Ltd. For safe, correct and effective usage of
these devices, please read the important information below.
 Please read the instruction carefully, and adjust, test or manipulate
under the instruction’s prescript.
 To protect the device, do not insert or withdraw the module, touch
Chip and element when the power on.
 Please use dependable, high accuracy test instrument and
equipment for test and measure to device.
 Accident analysis need to original records, the device version
information, and field fault process description
 If there is any abnormal or need repaired, please make contact with
us.


CONTENTS
PART ONE TECHNICAL INSTRUCTION ..................................................................................... 1
1

SUMMARIZE ........................................................................................................................ 1

1.1

APPLICATION ...................................................................................................................... 1

1.2

CHARACTERISTIC .............................................................................................................. 1

1.3

FUNCTION DEPLOYMENT ................................................................................................. 1

2

TECHNICAL PARAMETERS ................................................................................................ 3

2.1

ENVIROMENTAL PARAMETER .......................................................................................... 3

2.2

RATED PARAMETERS ........................................................................................................ 3

2.3

PERFORMANCE INDEX ..................................................................................................... 3

2.4

COMMUNICATION INTERFACE ......................................................................................... 5

2.5

INSULATION PERFORMACE.............................................................................................. 5

2.6

ELECTROMAGNETIC COMPATIBILITY CHARACTERISTICS .......................................... 6

2.7

MECHANICAL PROPERTIES .............................................................................................. 6

3

EDCS-81502 STATION TRANSFORMER PROTECTION AND MONITORING DEVICE... 7

3.1

FUNCTION PRINCIPLE ....................................................................................................... 7

3.2

DEVICE SETTING.............................................................................................................. 17

3.3

DEVICE HARDWARE ........................................................................................................ 27

4

EDCS-81503 STATION TRANSFORMER PROTECTION AND MONITORING DEVICE. 42

4.1

FUNCTION PRINCIPLE ..................................................................................................... 42

4.2

DEVICE SETTING.............................................................................................................. 73

4.3

DEVICE HARDWARE ...................................................................................................... 739

PART TWO INSTRUCTION FOR USE ......................................................................................... 85
1

OPERATION INSTRUCTION ............................................................................................. 85

1.1

THE KEYS .......................................................................................................................... 85

1.2

THE MENU ......................................................................................................................... 85

2

DEVICE OPERATIONS ...................................................................................................... 90

2.1

NORMAL OPERATIONAL MODE STATUS........................................................................ 90

2.2

ABNORMAL INFORMATION PROCESSING .................................................................... 91

3

INSTALLATION INSTRUCTIONS ...................................................................................... 93

3.1

BOX OPENING CHECK ..................................................................................................... 93

3.2

INSTALLATION NOTICE .................................................................................................... 93

4

CIRCUIT DEBUG SYLLABUS............................................................................................ 94

4.1

TEST NOTICE .................................................................................................................... 94

4.2

ACCIDENT ANALYSIS NOTICE ........................................................................................ 94

4.3

AC LOOP CHECK .............................................................................................................. 95

4.4

INPUT CONTACT CHECK ................................................................................................. 95
I


4.5

OUTPUT CONTACT CHECK ............................................................................................. 95

4.6

DEVICE UNIT TEST ........................................................................................................... 95

5

PRINT ACTION REPORT................................................................................................. 995

6

TRANSPORTATION AND STORAGE .............................................................................. 995

7

APPENDIX ........................................................................................................................ 100

7.1

CHASSIS STRUCTURE .................................................................................................. 100

7.2

COMMUNICATION CONNECTION ................................................................................. 102

7.3

DEVICE CONFIGURATION TABLE AND ORDERING INSTRUCTION .......................... 105

7.4

PROTECTION VALUE SETTING FORM ......................................................................... 106

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EDCS-8150 Station transformer protection & monitoring device
instruction manual

PART ONE TECHNICAL INSTRUCTION
1 SUMMARIZE
0B

1.1 APPLICATION
10B

EDCS-8150 Station Transformer Protection and Monitoring System, which is used for3~
35kV voltage class low current earthed system or low resistance earthed station transformer or
earthed transformer protection and control system series, can be installed by screen, also by local
at switch cabinet.

1.2 CHARACTERISTIC
1B

1)

Powerful function, hardware platform, versatility

2)

Full configuration design, powerful programmable function

3)

Advanced technology, patented de vice structure

4)

Run stably and reliably, high anti-interference ability

5)

Friendly interface, event recorded fully, operate safely

6)

Convenient and flexible communication network way

1.3 FUNCTION DEPLOYMENT
12B

TYPE
NAME
IEEE code
50,67,27,59,47
50,67,27,59,47
50,67,27,59,47
51

50N1T

50N2T

50N3T

46T1

46T2

Protection
function
Over-current Ⅰ
stage protection
Over-current II
stage protection
Over-current III
stage protection
Inverse time limit
over-current
protection
Zero-sequence
over-current Ⅰ
stage protection
Zero-sequence
over-current
II
stage protection
Zero-sequence
over-current III
stage protection
negative-sequen
ce over-current

stage
protection
negative-sequen
ce over-current II
stage protection

EDCS-81502

EDCS-81503

Station Transformer Protection and
Control System

Station Transformer
Protection and Control
System
















1


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Positive-sequen
ce inverse time
limit protection
Low-voltage
27
protection
Zero-sequence
59N
over
voltage
protection
Non-electrical
50T
quantity
protection
51
Overload alarm
Backup
79R
auto-switch-in
Residual current
67N
earthed-line
selection
Measure and control function
51

EDCS-8150 Station transformer protection & monitoring device
instruction manual















Self-diagnosis





Control circuit disconnection monitor





Fault wave recorded



Event recorded





Remote and local operation





Telemetering, telecommunication





Remote control





Independent operational circuit





Binary input(standard/expanded)

9/19

9/19

Binary output(standard/expanded)

5/12

5/12

Hardware configuration

Communication interface
Chassis structure
Voltage transformer connection mode

2

CAN(485)/Ethernet

CAN(485)/Ethernet

5U 19"/3 or 6U 19"/3

6U 19"/3

YY

YY


NEW CENTURY RELAYS

2

EDCS-8150 Station transformer protection & monitoring device
instruction manual

TECHNICAL PARAMETERS
1B

2.1 ENVIROMENTAL PARAMETER
13B

Operation Temperature: 0~40℃
Limited Temperature: -10~55℃
Storage and Transport: -25~70℃

2.2 RATED PARAMETERS
14B

DC power: 220V or 110V (please indicate when ordering);
Allowable deviation: -20%~+20%;
AC voltage: 100 / 3 V (Rated phase voltage Un);
AC current: 5A or 1A (Rated phase current In, please indicate when ordering);
Rated frequency: 50Hz
Overload capacity:
Current loop: 2 times of rated current, continuous working
10 times of rated current, Allow 10 seconds
40 times of rated current, Allow 1 second
Voltage loop: 1.5 times of rated voltage, continuous working
Power dissipation:
Current loop: Not more than 0.5 VA /Phase (when Rated value is 5A)
Not more than 0.5 VA /Phase (when Rated value is 1A)
Voltage loop: Not more than 0.5 VA /Phase (when Rated value is 100V)
Not more than 0.5 VA /Phase (when Rated value is 100/ 3 V)
DC loop: Normal, not more than 10 W
Trip, not more than 15 W

2.3 PERFORMANCE INDEX
15B

2.3.1

OVER-CURRENT PROTECTION
39B

Current value range:

0.20In~10.00In (In TA 2nd rated current, the same below)

Current value error:

≤±3% or ±0.03A

Time value range:

0.00s~100.00s

Time value error:

≤±1% or ±35ms

2.3.2

ZERO-SEQUENCE OVER-CURRENT PROTECTION
40B

Current value range:

0.10A~100.00A

Current value error:

≤±3% or ±0.03A

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Time value range:

0.00s~100.00s

Time value error:

≤±1% or ±35ms

2.3.3

NEGATIVE-SEQUENCE OVER-CURRENT PROTECTION
41B

Current value range:

0.10A~100.00A

Current value error:

≤±3% or ±0.03A

Time value range:

0.00s~100.00s

Time value error:

≤±1% or ±35ms

2.3.4

POSITIVE-SEQUENCE INVERSE TIME LIMIT PROTECTION
42B

Reference value range:

0.10A~15.00A

Reference value error:

≤±3% or ±0.03A

Time constant value range:

0.00s~100.00s

Time constant value error:

≤±1% or ±35ms

2.3.5

LOW VOLTAGE PROTECTION
43B

Voltage value range:

2.00V~70.00V

Voltage value error:

≤±3% or ±0.1V

Time value range:

0.00s~100.00s

Time value error:

≤±1% or ±35ms

2.3.6

ZERO-SEQUENCE OVER-VOLTAGE PROTECTION
4B

Voltage value range:

2.00V~160.00V

Voltage value error:

≤±3% or ±0.1V

Time value range:

0.00s~100.00s

Time value error:

≤±1% or ±35ms

2.3.7

NON ELECTRICITY PROTECTION
45B

Time value range:

0.00s~100.00s

Time value error:

≤±1% or ±35ms

2.3.8

4

EDCS-8150 Station transformer protection & monitoring device
instruction manual

BACKUP AUTO-SWITCH-IN FUNCTION
46B

With voltage value range:

50.00V~250.00V

Losing voltage value range:

20.00V~250.00V

Voltage value range:

≤±3%

Time value range:

≤±1% or ±45ms


NEW CENTURY RELAYS

2.3.9

EDCS-8150 Station transformer protection & monitoring device
instruction manual

OUTPUT CONTACT CAPACITY
47B

Signal contact capacity:
Allowable long-term utilize current: 5A
Sever current: 0.3A (DC220V, V/R 1ms). With no current to maintain
Protection output delay node capacity:
Allowable long-term utilize current: 5A
Sever current: 0.3A (DC220V, V/R 1ms).With no current to maintain

2.4 COMMUNICATION INTERFACE
16B

It is configured with 3 communication ports: CAN, RS-485, and Ethernet. Communication
protocol can choose DL/T667-1999(IEC60870-5-103), XSJ-7000DH or Modbus, and its
communication rate can be set. One of the ports is used for GPS alignment time.

2.5 INSULATION PERFORMACE
17B

2.5.1

INSULATION RESISTANCE
48B

In normal atmosphere environment, insulation resistances between energized and
non-energized sections as well as between those circuits with no electric connections are no less
than 100 tested by a mega ohmmeter at 500V open-circuit voltage.
2.5.2

DIELECTRIC STRENGTH
49B

In normal testing ambient atmosphere, the device is robust enough to withstand an AC
voltage-endurance test at 2kV, 50Hz(rated insulation voltage>63V), 0.5kV, 50Hz(rated insulation
voltage≤63V)and lasting for 1min, yet without breakdown or flashover phenomenon. In the course
of trial, when a test loop is powered on the others are connected to ground with equal potential.
2.5.3

IMPULSE VOLTAGE
50B

In normal atmosphere environment, insulation resistances between energized and
non-energized sections as well as between those circuits with no electric connections, the device
is able to withstand a short-time inrush voltage test with 1.2/50μs standard lightning surge, for the
circuit of which voltage is less than 60 V the test voltage is 1kV, and for that more than 60 V the
test voltage is 5kV.
2.5.4

MOISTURE-HEAT RESISTANT
51B

Device can endure highest test temperature: +40, test time: two cycles (48 H); the insulation
of each regulated part are no less than 1.5  measured by a mega ohmmeter at 500V
open-circuit voltage, and can withstand 75% voltage of the dielectric strength test, without
breakdown or flashover phenomenon.

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EDCS-8150 Station transformer protection & monitoring device
instruction manual

2.6 ELECTROMAGNETIC COMPATIBILITY CHARACTERISTICS
18B

Oscillating wave anti-interference: under the protocol of GB/T 14598.13(IEC 60255-22-1).
The harsh classification: III stage.
Electrostatic Discharge Disturbance Test: in line with the protocol of GB/T 14598.14(IEC
60255-22-2). The harsh classification: IV stage.
RF electromagnetic field radiation anti-interference: in line with the protocol of GB/T
14598.9(IEC 60255-22-3). The harsh classification: III stage.
Fast Transient Interference and Pulse Group Interference Test: in line with the protocol of
GB/T 14598.10(IEC 60255-22-4). The harsh classification: A stage.
Surge Immunity Test: in line with r the protocol of GB/T 14598.18(IEC 60255-22-5). The
harsh classification: IV stage.
Radiofrequency field inductive conduction disturbance: in line with the protocol of GB/T
14598.17(IEC 60255-22-6). The harsh classification: III stage.
Power current interference: in line with the protocol of GB/T 14598.19(IEC 60255-22-7). The
harsh classification: A stage.
Conducted emission limit value: in line with the protocol of GB/T 14598.16.
Radiated emission limit value: in line with the protocol of GB/T 14598.16.

2.7 MECHANICAL PROPERTIES
19B

Vibration: Device can endure vibration durability and response test of the harsh
classification stage I ruled in GB/T 11287.
Impact: Device can endure impact durability and response test of the harsh classification
stage I ruled in GB/T 14537.
Crash: Device can endure crash test of the harsh classification stage 1 ruled in GB/T 14537.

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3

EDCS-81502 Station transformer protection & monitoring device
instruction manual

EDCS-81502 STATION TRANSFORMER PROTECTION AND
MONITORING DEVICE

3.1 FUNCTION PRINCIPLE
20B

3.1.1

OVERCURRENT PROTECTION
52B

The protection response to interphase short-circuit fault, and the device set three stages of
overcurrent protection which has separately current and time setting and control command.
Overcurrent I-Stage Protection and Overcurrent II-Stage Protection are definite time limited
current protection; Overcurrent III-Stage Protection can be selected by means of control
command to be definite time or inverse time. The action time of inverse-time overcurrent
protection is inversely proportional to the size of fault current in the protected lines, i.e. the larger
the fault current, the shorter the action time, vice versa. Inverse time characteristics follow the
protocol of IEC255-4.
3.1.1.1 OVERCURRENT I-STAGE PROTECTION LOGIC
Overcurrent elements, operation criteria are:
Max(Ia,Ib,Ic)> I1zd
Where: Ia, Ib, Ic: three-phase protection current;

I1zd: overcurrent setting.

3.1.1.2 OVERCURRENT II-STAGE PROTECTION LOGIC
The protection logic is the same as Overcurrent I-Stage Protection.
3.1.1.3 OVERCURRENT Ⅲ-STAGE PROTECTION LOGIC
1) Definite Time Overcurrent Ⅲ-Stage:
The protection logic is the same as Overcurrent I-Stage Protection.
2) Inverse Time Overcurrent Ⅲ-Stage:
When the setting of “overcurrent Ⅲ-stage inverse time characteristics” is “1”, it is “Normal
Inverse”; when the setting is “2”, it is “Very Inverse”; when the setting is “3”, it is “Extremely
Inverse”. The values of inverse type refer to the following table.
Constant values of α and β are determined as the following table:
α

β

Normal Inverse(tp: 0.05s~100.00 s)

0.02

0.14

Very Inverse(tp: 0.05s~80.00 s)

1.0

13.5

Extremely Inverse(tp: 0.05s~14.00 s)

2.0

80.0

Inverse Types

t 



 tp



 I 


 Ip 

1

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EDCS-81502 Station transformer protection & monitoring device
instruction manual

Where: I: fault current, current comes from phase A, phase B and phase C;
tp: time factor, time comes from Overcurrent Ⅲ-Stage settings: 0.05s~1s;
Ip: current reference settings, current comes from Overcurrent Ⅲ-Stage settings;
t: operation time.
3.1.1.4 OVERCURRENT PROTECTION LOGIC DIAGRAM
Ia>I1zd

≥1

Ib>I1zd

&

T1

OC stage I act

&

T2

OC stage II act

Ic>I1zd
OC I soft presser pickup

Ia>I2zd

≥1

Ib>I2zd
Ic>I2zd
OC II soft presser pickup

Ia>I3zd

≥1

Ib>I3zd

&

Ic>I3zd

FSX
FSX

T3

OC stage III act

IDMT

OC inverse time act

OC III soft presser pickup

3.1.2

NEUTRAL OVERCURRENT PROTECTION

The protection is the reaction of single-phase ground fault, and the device set three stages
of neutral overcurrent protection which independently has current setting, time setting and
control command. Overcurrent I-Stage, II-Stage and III-Stage jointly output protect tripping
output; overcurrent I-Stage not only output protects tripping output, but also output divides LV
side bus connection; Overcurrent II-Stage not only output protects tripping output, but also
output divides LV side inlet.
Neutral Overcurrent III-Stage can be selected by means of soft presser to be tripping or
alarming.
3.1.2.1 NEUTRAL OVERCURRENT I-STAGE LOGIC
The protection includes the following components:
Neutral Overcurrent Element, the operation criteria is:
I0 > I01zd
Where: I0: Neutral current, current comes from neutral TA of transformer;
I01zd: Neutral overcurrent I-stage setting.
3.1.2.2 NEUTRAL OVERCURRENT Ⅱ-STAGE LOGIC
The protection logic is the same as Neutral Overcurrent I-Stage Protection

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EDCS-81502 Station transformer protection & monitoring device
instruction manual

3.1.2.3 NEUTRAL OVERCURRENT Ⅲ-STAGE LOGIC
1) Definite Time Neutral overcurrent Ⅲ-Stage:
The protection logic is the same as Neutral Overcurrent I-Stage Protection.
2) Inverse Time Neutral overcurrent Ⅲ-Stage:
When the setting of “Neutral Overcurrent inverse time characteristics” is “1”, the inverse type
is normal inverse; when the setting is “2”, the inverse type is very inverse; when the setting is “3”,
the inverse type is extremely inverse. The values of each type refer to the following table:
The confirmed constant values of α and β are as the following table:
α

β

Normal Inverse(tp: 0.05s~100.00 s)

0.02

0.14

Very Inverse(tp: 0.05s~80.00 s)

1.0

13.5

Extremely Inverse(tp: 0.05s~14.00 s)

2.0

80.0

Inverse Types

t 



 tp



 I 


 Ip 

1

Where: I: fault current, current comes neutral TA;
tp: time factor, time comes from neutral overcurrent III-stage settings: 0.05s~1s;
Ip: current reference settings, current comes from neutral overcurrent III-stage settings;
t: operation time.
3.1.2.4 NEUTRAL OVERCURRENT PROTECTION LOGIC DIAGRAM
I0>I01zd

&

T01

Neutral I-stage act

&

T02

Neutral II-stage act

T03

Neutral I-stage alarm

Neutral OC I-stage soft presser pickup

I0>I02zd
Neutral OC II-stage soft presser pickup

I0>I03zd
Neutral OC I-stage alarm soft presser pickup

I0>I03zd
Neutral OC III-stage soft presser pickup

3.1.3

&

FSX
FSX

&

FSX
FSX

IDMT
T03

IDMT

Neutral inverse time alarm
Neutral III-stage act
Neutral inverse time act

NEGATIVE SEQUENCE OVERCURRENT PROTECTION

The protection is the reaction of single-phase ground fault, and the device set two stages of
negative sequence overcurrent protection which independently has current setting, time setting
and control command. As the calculation method of negative sequence current is related with

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EDCS-81502 Station transformer protection & monitoring device
instruction manual

the configuration mode of current transformer, 2-phase protection CT in auxiliary setting menu
should be set as “1” with regard to only A-phase and C-phase current transformer is equipped.
3.1.3.1 NEGATIVE SEQUENCE OVERCURRENT STAGE I LOGIC
The protection includes the following components:
Negative Sequence Overcurrent Element, the operation criteria is:
I2 > I2zd1
Where: I2: negative sequence current, I2zd1: negative sequence stageⅠsetting.
3.1.3.2 NEGATIVE SEQUENCE OVERCURRENT STAGE II LOGIC
The protection logic is the same as Negative Sequence Overcurrent I-Stage Protection.
3.1.3.3 NEGATIVE SEQUENCE OVERCURRENT PROTECTION LOGIC DIAGRAM
I2>I1zd1

&

T1zd1

NS OC I-stage act

&

T2zd2

NS OC Ii-stage act

NS OC I-stage soft presser pickup

I2>I2zd2
NS OC II-stage soft presser pickup

3.1.4

POSITIVE SEQUENCE INVERSE TIME PROTECTION

As the calculation method of positive sequence current is related with the configuration
mode of current transformer, 2-phase protection CT in auxiliary setting menu should be set as
“1” with regard to only A-phase and C-phase current transformer is equipped.
3.1.4.1 POSITIVE SEQUENCE INVERSE TIME PROTECTION LOGIC
The operation criteria is:
I1 > Izx
Where: I1: positive sequence current, Izx: positive sequence inverse setting.
When the setting of “Positive Sequence inverse time characteristics” is “1”, the inverse type
is normal inverse; when the setting is “2”, the inverse type is very inverse; when the setting is “3”,
the inverse type is extremely inverse. The values of each type refer to the following table.
The confirmed constant values of α and β are as the following table:
α

β

Normal Inverse(tp: 0.05s~100.00 s)

0.02

0.14

Very Inverse(tp: 0.05s~80.00 s)

1.0

13.5

Extremely Inverse(tp: 0.05s~14.00 s)

2.0

80.0

Inverse Types

t 



 tp



 I 


 Ip 

1

Where: I: fault current, current comes positive sequence current;
tp: time factor, time comes from positive sequence inverse time: 0.05s~1s;

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EDCS-81502 Station transformer protection & monitoring device
instruction manual

Ip: current reference settings, current comes from positive sequence inverse time
settings;
t: operation time.
3.1.4.2 POSITIVE SEQUENCE INVERSE TIME PROTECTION LOGIC DIAGRAM

I1>Izx
IDMT

&

PS inverse time limit soft presser pickup

PS inverse time limit act

PS inverse time limit ctrl command pickup

3.1.5

LOW VOLTAGE PROTECTION

3.1.5.1 LOW VOLTAGE PROTECTION LOGIC
The operation criteria is:
Max(Uab、Ubc、Uca) < Udy
Where: Uab, Ubc, Uca: bus voltage, Udy: voltage-loss setting.
3.1.5.2 LOW VOLTAGE PROTECTION LOGIC DIAGRAM
LV hard presser pickup
LV soft presser pickup

&

Uab<Udy

&

Ubc<Udy

&

Uca<Udy

Tdy

LV act

Open pos. is 0
TV fuse fail is 0

3.1.6

RESIDUAL OVERVOLTAGE PROTECTION

The device is configured with a residual overvoltage protection, which can select tripping or
alarming through soft presser.
3.1.6.1 RESIDUAL OVERVOLTAGE PROTECTION LOGIC
The operation criteria are:
3U0 > U0y
Where: 3U0: calculated zero sequence voltage, U0y: residual overvoltage setting.
3.1.6.2 RESIDUAL OVERVOLTAGE PROTECTION LOGIC DIAGRAM

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3U0>U0y
Open pos. is 0

EDCS-81502 Station transformer protection & monitoring device
instruction manual

&

&

T0y

Residual overvoltage act

&

&

T0y

Residual overvoltage alarm

Residual overvoltage soft presser pickup

3U0>U0y
Open pos. is 0
Residual overvoltage alarm soft presser pickup

3.1.7

NON-ELECTRICITY PROTECTION

The device is configured with three non-electricity protection, which can select tripping or
alarming through soft presser.
3.1.7.1 NON-ELECTRICITY 1 LOGIC
1)

When the soft presser control command of “non-electricity 1” is “1”, proceed the following
identification.
When non-electricity 1 digital is 1, start non-electricity 1 protection delay Tfdl. If the criteria

are met during delay, maintain this delay; if the criteria are not met, return and if delay to the
setting Tfdl, non-electricity 1 take action.
2)

When the soft presser control command of “non-electricity 1” is “0”, proceed the following
identification.
When non-electricity 1 digital is 1, start non-electricity 1 protection delay Tfdl. If the criteria

are met during delay, maintain this delay; if the criteria are not met, return and if delay to the
setting Tfdl, non-electricity 1 alarm.
Where: Tfdl, Tfd2, Tfd3: non-electricity time;
3.1.7.2 NON-ELECTRICITY 2 LOGIC
The protection logic is the same as non-electricity 1 Protection.
3.1.7.3 NON-ELECTRICITY 3 LOGIC
The protection logic is the same as non-electricity 1 Protection.
3.1.7.4 NON-ELECTRICITY PROTECTION LOGIC DIAGRAM
Non-elec 1 input: 1

&

Tfdl

Non-elec 1 act

&

Tfdl

Non-elec 1 alarm

&

Tfd2

Non-elec 2 act

&

Tfd2

Non-elec 2 alarm

Non-elec 1 soft presser pickup

Non-elec 2 input: 1

Non-elec 2 soft presser pickup

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EDCS-81502 Station transformer protection & monitoring device
instruction manual

Non-elec 3 input: 1

&

Tfd3

Non-elec 3 act

&

Tfd3

Non-elec 3 alarm

Non-elec 3 soft presser pickup

3.1.8

OVERLOAD PROTECTION

3.1.8.1 OVERLOAD PROTECTION LOGIC
Overload element monitors the three phases load current. When maximum phase current
exceeds the settings and the duration time is more than the delay time, overload alarms. The
operation criteria are:
Max(Ia, Ib, Ic) > Igfh
Where: Ia, Ib, Ic: three-phase protection current;
Igfh: overload current settings.
3.1.8.2 OVERLOAD PROTECTION LOGIC DIAGRAM
Max(Ia、Ib、Ic)>Igfh

&

Tgfh

Overload alarm

Overload soft presser pickup

3.1.9

RESIDUAL CURRENT EARTHED-LINE SELECTION ALARM

This protection is configured with the fundamental components of zero sequence direction
protection, which provides the basis for the earthed-line selection.
3.1.9.1 RESIDUAL CURRENT EARTHED-LINE SELECTION ALARM LOGIC
1) When used for ungrounded system, the control command of “zero sequence direction” is “0”,
Operation criteria is:
I0H > I0jd
3U0 > U0y
0°< Arg (3U0/I0H) < 180°,3U0 leads I0H :0°~180°
t > 10s
The relationship of four above is “and”:
Where: I0H: HV side direct detecting neutral current;
I0jd: residual current earthed-line selection settings;
3U0: calculated residual voltage;
U0y: residual overvoltage settings, the same as residual overvoltage alarm.
2) When used for peterson coil grounding system, the control command of “zero sequence
direction” is “1”. Angle range: 90°< Arg(3U0/I0) <

270°。Considering the error of I0H, the

equation has a small angle (about 6°) treatment. Operation criteria is:
I0H > I0jd
3U0 > U0y

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instruction manual

84°< Arg(3U0/I0) < 264°, 3U0 leads I0:84°~264°
t > 10s
The relationship of above four is “and”.
3.1.9.2 RESIDUAL CURRENT EARTHED-LINE SELECTION ALARM LOGIC DIAGRAM
I0H>I0jd
3U0>U0y
0°< Arg(3U0/I0)< 180°

&


Zero sequence directional ctrl command: 1

84°< Arg(3U0/I0)< 264°

&

10s

Earthed line select alarm

&

TV fuse fail
Earthed line select alarm soft presser input

3.1.10 TV FUSE FAILURE
TV monitoring is used to detect one-phase fuse failure, two-phase fuse failure or
three-phase voltage-loss failure of TV circuit. The device will report “TV fuse failure” and trig LED
indicator if one of the two following operating criteria is met。
1)If Positive sequence voltage U1<30V and protection current Max(Ia, Ib, Ic)>0.06In, judge the
failure as TV fuse failure after a delay time of 10s.
2) If Negative sequence voltage U2>8V, judge the failure as TV fuse failure after a delay time
of 10s.
3.1.11 TA DISCONNECTION
TA disconnection protection is used for detecting the abnormal state of TA circuit. If Max (Ia,
Ic) >4*Min (Ia, Ic) and Max(Ia, Ic)>0.3In, the device will report “TV fuse failure”, alarm signal would
issued and the LED indicator would be lit after 10s delay.
3.1.12 TWJ ABNORMAL ALARM
TWJ abnormal alarm is used for detecting the correctness of the position signal of the
breaker’s normally closed contact. “TWJ abnormal alarm” would be reported and LED indicator
would be trigged, if one of the two operation criteria is met.
1)

If Max(Ia, Ib, Ic)>0.06In, and auxiliary setting “digital input 1 is TWJ” is set as 0, digital input
“TWJ” is 1, it will alarm after a delay time of 10s.

2)

If Max(Ia, Ib, Ic)>0.06In, and auxiliary setting “digital input 1 is TWJ” is set as 1, digital input
“input 1” is 1, it will alarm after a delay time of 10s.

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3.1.13 CONTROL CIRCUIT DISCONNECTION ALARM
Judge the integrity of the control circuit, according to the contact position of relay HWJ and
relay TWJ. If the contact position of HWJ and TWJ detected both are 0 or 1, the unit report
“control circuit disconnection alarm” and trig LED indicator after a delay time of 10s to confirm.
Control circuit disconnection detection can be picked-up/dropped-out by control command
3.1.14 SPRING DISCHARGED ALARM
If digital input“spring discharged” is 1, the unit report “spring discharged” and trig LED
indicator and alarm signal after a delay time to confirm. The delay time is settable.
3.1.15 REMOTE CONTROL
1)

Remote/local switch
Switch on the device and upper computer is available. If remote control mode is selected,

the unit would block operation and prompt “remote state block” when tripping/closing operation is
conducted locally. R/L respectively appearing at the first line of main heading page stands for
remote/local separately.
2)

Tripping operation
To breaker, it required detecting remote/local mode and it is unnecessary to detect the

position of breaker. Output pulse width is 1s
3)

Closing operation
To breaker, it required detecting remote/local mode and protection operation output. Closing

operation is unavailable before protection operation output is removed and it is in no need to
detect the position of breaker. Output Pulse width is 1s.
4) Remote control LV side tripping/remote control LV side closing operation
To LV side breaker, it required detecting remote/local mode, and it is in no need to detect
other position. Output pulse width is determined as the corresponding setting in auxiliary settings.
It will provide the function only if there is IO module.
5) Remote control tripping 1/remote control closing 1 operation
To other switches such as electric isolator, it required detecting remote/local mode, and it is
in no need to detect other position. Output pulse width is determined as the corresponding
setting in auxiliary settings. The field engineering personnel will open the function only if it is
needed.
3.1.16 OTHER PRINCIPLES
With the function of disturbance recorder, the device at most records 15 analogs and 32
digital information. The 1-24 bit of digital information word is output signal (bit 1-5 is
corresponding to output 1-5 of CPU presser, bit 6-12 is corresponding to output 6-12 of IO
presser, specific definition is decided by engineering design; Bit 13-24 is reserved, which does
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instruction manual

not use in this device); 25-32 bit of digital information word is digital input signal, corresponding
to the front 8 input signal of CPU presser. There are two type of triggering mode of disturbance
recording:
1)

Command triggering

2)

Protection action triggering
The main memory of SCM only memorized the directly sampling data of recording data

without any processing, and the processing of recording signal is completed in background
computer.
The device also records the events of operation, status input displacement, setting
modifying and alarm and the records can up to 300, no loss even power off.

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EDCS-81502 Station transformer protection & monitoring device
instruction manual

3.2 DEVICE SETTING
20B

The protection function of device is designed according to maximum configuration and the
following protection setting is typical configuration. Users can choose on/off through the protection
control command and soft presser according to the protection configuration. Protection
parameters have 8 groups of switchable Setting ranges. Other parameters have only one group of
setting range.
3.2.1

SYSTEM SETTING LISTING
STEP
LENGTH
OF
SETTING

NO.

NAME OF SETTING

SETTING
RANGE

1

Control command 1

0000-FFFF

-

2

Control command 2

0000-FFFF

-

3

Protection TA 1

0~8000A

1A

4

Protection TA 2

1/5A

1A

5

Metering TA 1

0~8000A

1A

6

Metering TA 2

1/5A

1A

7

Neutral TA1

0~4000A

1A

8

Neutral TA2

1/5A

1A

9

Bus TV 1

0.0~110.0kV

0.1kV

10

Bus TV 2

0~120V

-

NOTE

NOTE:
System parameter is relavent to protection operation, so please set the system parameters
according to the actual situation.
3.2.2

NO.

PROTECTION SETTING
USE
RANGE

NAME OF
SETTING

STEP
SETTING
LENGTH
SETTING RANGE
SYMBOL
OF
SETTING

Control
command 1
Control
command 2
Control
command 3

1
2
3

0000-FFFF

-

0000-FFFF

-

0000-FFFF

-

Over
current
4

I-stage
protectio
n use

NOTE

The device and the
Overcurrent
stage I set

backstage is configured
I1zd

0.10In~20.00In

0.01 A

according to actual values,
rather than multiple mode,
which is to explain the

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effective range when protect
TA 2 is 1A/5A. The same
below.
Over current

5

6

stage I time
Over

Over current

current

stage Ⅱ set

T1

0.00s~100.00s

0.01 s

I2zd

0.10In~20.00In

0.01 A

T2

0.00s~100.00s

0.01 s

I3zd

0.10In~20.00In

0.01 A

T3

0.00s~100.00s

0.01 s

I01zd

0.02A~20.00A

0.01 A

T01

0.00s~100.00s

0.01 s

I02zd

0.02A~20.00A

0.01 A

T02

0.00s~100.00s

0.01 s

I03zd

0.02A~20.00A

0.01 A

T03

0.00s~100.00s

0.01 s

Ⅱ-stage
7

protectio
n use

8

Over current
stage Ⅱ time

Over

Over current

current

stage Ⅲ set

Ⅲ-stage
9

protectio
n use

10

11

12

13

14

15
16

Over Current
Stage Ⅲ time

Neutral

Neutral stage I

stage I

set

protectio

Neutral stage I

n use

time

Neutral

Neutral stage

stage Ⅱ

Ⅱ set

protectio

Neutral stage

n use

Ⅱ time

Neutral

Neutral stage

stage Ⅲ

Ⅲ set

protectio

Neutral stage

n use

Ⅲ time

NS OC

NS stage I set

I2zd1

0.10In~20.00In

0.01 A

NS stage I time

T2zd1

0.00s~100.00s

0.01 s

I2zd2

0.10In~20.00In

0.01 A

T2zd2

0.00s~100.00s

0.01 s

Stage-I
17

protectio
n use

18

19
20

NS OC

NS stage Ⅱ

Stage-Ⅱ

set

protectio

NS stageⅡ

n use

time

PS IT

PS IT setting

Izx

0.10In~4.00In

0.01 A

PS IT time

Tzx

0.00s~100.00s

0.01 s

LV setting

Udy

2.00V~70.00V

0.01 V

LV time

Tdy

0.00s~100.00s

0.01 s

Residual

U0y

2.00V~160.00V

0.01 V

protect
21
22

use
LV
protect

23
24

18

use
Residual

shared with residual current


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EDCS-81502 Station transformer protection & monitoring device
instruction manual

Over

overcurrent

voltage

setting
Residual

25

overcurrent time

earthed-line selection alarm

T0y

0.00s~100.00s

0.01 s

Tfd1

0.00s~100.00s

0.01 s

Non-elelc
26

1 protect

Non-elec 1 time

use
OC
Stage-Ⅲ
27

inverse
curve

Inverse OC
characteristic

1: normal inverse
FXST

1~3

1

2: very inverse
3: extremely inverse

selection
PS
28

inverse

PS Inverse OC

curve

characteristic

1: normal inverse
ZXFX

1~3

1

2: very inverse
3: extremely inverse

selection
Neutral
OC stage

29

inverse
curve

Neutral Inverse
OC

1: normal inverse
LXFX

1~3

1

characteristic

2: very inverse
3: extremely inverse

selection
30

Overload

Over load set

Igfh

0.10In~20.00In

0.01 A

Over load time

Tgfh

0.00s~100.00s

0.01 s

Non-elec 2 time

Tfd2

0.00s~100.00s

0.01 s

Non-elec 3 time

Tfd3

0.00s~100.00s

0.01 s

I0jd

0.20A~0.80A

0.01 A

protect
31

use
Non-elec

32

2 protect
use
Non-elec

33

3 protect
use
Residual
current

34

earthed-li

Grounding

ne

selection setting

selection
alarm
If no special description, ‘1’ means the corresponding function pickup, ’0’ means the corresponding function
dropout.
0: OC Ⅲ=definite time
OC Ⅲ Inverse
FSX
0/1
1
1
Control
1: OC Ⅲ=inverse time
comma
TV fuse fail
TVDX
0/1
1
nd 1
2
TV fuse fail on/off
detect

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