D21_D31_differential.pdf

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Protection

and control

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HV/MV Substation

Sepam 2000 D21 - D31

Differential protection

c transformer

c generator-transformer unit

c auto-transformer

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Presentation

Contents

page

presentation

2

protection

5

metering

7

disturbance recording

8

control and monitoring

9

implementation

13

functional and connection schemes

14

connection of logical inputs/outputs

23

communication

25

characteristics

26

installation

27

ordering information

28

The Sepam 2000 D21 and D31 differential protections

are designed to protect a zone which includes

a transformer, an auto-transformer or a

generator-transformer unit, of a HV/MV substation.

Type D21 for two-ended zones,

Type D31 for three-ended zones.

Advantages

c Complete protection against internal transformer faults,

c

Restricted earth fault protection included,

c Simple implementation due to the use of neural networks,

v Simplified sizing of current sensors,

v Few settings,

v No matching transformers required,

c

Measurement:

v Currents and phase shifts,

v Residual currents,

v Differential and through currents,

v Memorization of differential and through current at the time of the fault,

c Test position,

c Disturbance recording,

c

High level of electromagnetic compatibility (EMC) makes it possible to use digital

technology in electrical substations, without the need for any particular

precautions,

c

Sepam 2000's continuous self-testing sets the device in a predetermined

fail-safe position when failures occur, preventing random operation,

c

Terminal blocks which may be individually disconnected while energized

to facilitate maintenance,

c The optional communication functions can be used for remote setting, remote

metering, remote annunciation and remote control via a two-wire link with a

supervisor for centralized management,

c

ISO 9001 certified design and manufacturing processes.

Sepam 2000 D21-D31.

Differential protection Sepam 2000 D21 - D31

2

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Functions

protection

ANSI code

Sepam type

D21

D31

biased differential

87T

c

c

restricted earth fault (winding 2)

64 REF

c

c

restricted earth fault (winding 3)

64 REF

c

metering

phase currents I (winding 1)

c

c

phase currents I’ (winding 2)

c

c

phase currents I” (winding 3)

c

phase shift between I and I’

c

c

phase shift between I and I”

c

residual current Io

c

c

residual current Io’

c

c

residual current Io”

c

differential currents: Id1, Id2, Id3

c

c

through currents: It1, It2, It3

c

c

tripping currents differential: trip Id1, trip Id2, trip Id3

c

c

through: trip It1, trip It2, trip It3

c

c

disturbance recording

c

c

control and monitoring

ANSI code

latching/acknowledgment

86

c

c

annunciation

30

c

c

breaker failure activation

c

c

circuit breaker closing order locking

c

c

detection of plugged connector (DPC)

c

c

fault trip counter

c

c

Sepam 2000 model

S36

CR

CC

number of ESTOR boards

2

3

Differential protection Sepam 2000 D21 - D31

3

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Presentation (cont'd)

Definitions

The terms winding 1, winding 2 and winding 3 are used like that :

c winding 1 refers to the circuit that has the highest voltage Un;

the corresponding currents are connected to connectors 2A and 2B,

c winding 2 refers to the circuit that has voltage Un' less than or equal to Un;

the corresponding currents are connected to connectors 3A and 3B,

c winding 3 refers to the circuit that has voltage Un' less than or equal to Un' for

Sepam D31;

the corresponding currents are connected to connectors 4A and 4B.

By extension, this definition also applies to an auto-transformer for which 2

windings are partially combined but which have different voltage levels.

U, I

winding 1

U, I

winding 1

U', I'

winding 2

U', I'

winding 2

U'', I''

winding 3

U'', I''

winding 3

example : U=132 kV, U'= 33 kV, U''= 11 kV

example : U=20 kV, U'= 15 kV, U''= 6 kV

The zone protected by Sepam 2000 D21 is the zone between the current sensors

connected to connectors 2A and 2B, at one end, and the sensors connected to

connectors 3A and 3B at the other end.

The zone protected by Sepam 2000 D31 is the zone between the current sensors

connected to connectors 2A and 2B, the sensors connected to connectors 3A and

3B and the sensors connected to connectors 4A and 4B.

General parameters

Status menu

heading

name

command

selection

frequency

Fn

data+, data-

50Hz or 60Hz

phase CT ratio

In, In', In'' (1)

numeric keys

10A to 6250A

windings 1, 2 and 3 (1)

Io sensor

type of

data+, data-

CT + CSH30

windings 1, 2 and 3 (1)

measurement

Ino, Ino', Ino'' (1)

numeric keys

1A to 6250A

numerical index

index'

numeric keys

0 to 11 (2)

of vector group

index'' (1)

(versus winding 1)

power

S (3)

numeric keys

1MVA to 999MVA

rated voltage

Un, Un', Un''

numeric keys

220V to 800kV

remote reading

function,

parameters

unit

rated frequency

D5h

Fn

Hz

phase CT

D0h, D9h, DAh (1)

rated current In, In', In'' (1) A

windings 1, 2 and 3 (1)

Io sensor

D2h, DBh, DFh (1)

type of measurement

index (4)

windings 1, 2 and 3 (1)

Ino, Ino', Ino'' (1)

A

transformer

DEh

numerical index

of vector groups

(versus winding 1)

power

MVA

voltage (winding 1)

V

voltage (winding 2)

V

voltage (winding 3)

V

(1) : for Sepam 2000 D31.

(2) : whatever the star or delta connections of the windings.

(3) : for two-winding transformer, S is the rated power,

for a three-winding transformer, S is the power of the most powerfull winding.

(4) : meaning of the index

2

: TC + CSH30,

other value

: not used.

Differential protection Sepam 2000 D21 - D31

4

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Protection

This protection adjusts the current phase and module of each winding according to

the parameterized transformer connection. It then compares the adjusted currents,

phase by phase. It is activated if the difference in currents Id for at least one phase

is greater than the operation set point.

The set point is defined by the operation characteristic below.

Protection stability with respect to external faults is also ensured by the biased

characteristic and by the 2 nd and 5 th harmonics neural network restraint which

analyzes the percentage as well as the differential and through currents.

This restraint prevents unwanted tripping when:

c the transformer is switched on,

c an asymmetrical fault occurs outside the zone, causing saturation of the current

transformers,

c the transformer is supplied by excessive voltage (overfluxing).

Differential protection

ANSI code 87 T

function number F601

I1

I1'

87T

I1'

Schematic diagram

I1

I1"

phase 1

87T

It

Id/It > (Id/It %)

I1

I1'

I1"(1)

F601/1

Id

Id > 0,3 Ib

phase 1

tripping

&

Percentage operation characteristics

Id(H2)

I2

I2'

I2"(1)

Id(H5)

F601/4

³ 1

Id/Ib

Id / It = 50 %

phase 2

phase 2

tripping

4

F601/2

tripping

I3

I3'

I3"(1)

phase 3

phase 3

tripping

3

F601/3

F601/6

K861

test mode

Id / It = 15 %

2

setting zone

(1) Sepam 2000 D31.

1

no tripping

0,3

It/Ib

Setting range and characteristics

bias characteristic Id/It

setting

0

2

4

6

8

10

Ib = transformer rated current.

Calculated as: Ib =

S

15% to 50%

e Un

resolution

1%

accuracy (1)

1%

% pick-up

(86

±

10)%

Sepam 2000 D21 :

–>

–>

time characteristics

operating time

Id = I adjusted - I' adjusted

= differential current

< 35 ms

recovery time

< 35 ms

–>

–>

outputs available for control logic

phase 1 tripping

It = max ( I adjusted , I' adjusted )

F601/1

= through current

phase 2 tripping

F601/2

phase 3 tripping

F601/3

phase 1, 2 or 3 tripping

F601/4

Sepam 2000 D31 :

test mode

F601/6

–>

–>

–>

Id = I adjusted - I' adjusted - I" adjusted

= differential current

remote reading, remote setting

function n °

60h

–>

–>

–>

parameter

setting Id/It

unit : %

It = max ( I adjusted , I' adjusted , I" adjusted )

(1) : in reference conditions (IEC 60255-13).

= through current

Differential protection Sepam 2000 D21 - D31

5

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Plik z chomika:

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