7sa522 Functions En

Productmanager Distance Protection

Michael Claus

EV S V 13 Nürnberg H

Phone: +49 911 433 8261

Fax: +49 911 433 8301

Email: [email protected]

SIPROTEC 4

7SA522

Distance Protection

for Transmission Lines

Distance protection Info - 3EV S V13/ Claus/ 21.08.00

7SA522Distance Protection for Transmission Lines


4-line back-lit display Measured values Fault data

Proven numeric keypad secure entry of numbers easy password entry

Turning ON/OFF of functions

Control of switchgear (plant)

14 LED´s for user assignment and slotto insert legend text

Navigation Keys convenient menu

operation

9-poleservice interface standard cable DIGSI 4

Width of housing

1/2 of 19" or 1full 19“ rack

SIPROTEC 7SA522 Front design

4 freely assignable function keys with slot for legend text


Width of housing1/2 of 19" or full 19"

4 Voltage Transformers (VT)

4 Current Transformers (CT)option with Ienormal or Iesensitive

Binary inputs 8 (16*, 24*)Output contacts 16 (24*,32*)

(*in full 19“ rack housing)

Time synchronizationGPS with IRIG-B and DCF-77

System interfaceelectric or fibre optic IEC60870-5-103 or Profibus

FMS (approx. 12/00)in future DNP3.0, MODBUS

and Profibus DP Service interfaceelectrical or fibre optic (FO)DIGSI 4 via Modem

Remote relay interface (plan)electric or fibre optic (FO)for protection signalling

Open to new techniques (methods)

electric or fibre optic (FO)process or 2nd remote relay

interface

SIPROTEC 7SA522 Terminals and Communication Interfaces


7SA522Connection Diagram: Basic Version

Front Port

System/Scada

Service PortDIGSI, Modem

IRIG-B A

B

C

Remote RelayInterface #1

D

Remote RelayInterface #2

E

Version Width No. ofBinaryInputs

No. ofOutputRelays

Basic ½ x 19“ 8 16Medium 1/1 x 19“ 16 24Maximum 1/1 x 19“ 24 32

OptionalSensitivity:• normal• high (5mA)

Connection:• Ven• Vsync• Vx

Live status contactNC or NO with Jumper

=

=(~)

IL1

IL2

IL3

I4

VL1

VL2

VL3

V4

Q1

Q3

Q5

Q7

Q2

Q4

Q6

Q8

SerialInterfaces

K1+

-K2

K3

K4

K5K6K7K8K9K10K11K12K13K14K15K16

R1R2R3R4R5R6R7R8R9R10R11R12BO 15

BO 14

BO 13

Fast BO1

Fast BO2Fast BO3Fast BO4

Fast BO5

Fast BO6

Fast BO7

BO8BO9BO10BO11

BO12

K17K18J1J2J3

J4J5J6

J7J8J9J10J11

BI 1

BI 2

BI 3

BI 4

BI 5

BI 6

BI 7

BI 8J12

R15

R16

R17

R18

R13

R14


52

7SA522Single Line Diagram

21

Distance

21N

6868T

PowerSwing

FL

FaultLocator

85-21

PilotDist.

Weakinfeed

27WI

Teleprotection schemescan use one channel ortwo redundant channels to the remote end

50N51N

GndO/C

67N

DirectionalGround

85-67N

PilotGnd

50HS

Switchonto-Flt. O/C

50BF

Bkr.fail.

59

Over-voltage

25

Synchro-check

79

Auto-reclosure

74TC

Trip Circuitsupervision

86

Lockout

Local/Tele Ctrl.CommandsCB Indications

5051

Over-current

50N-251N-2

50STUB

STUB O/C

Operat.values

Super-vision

Serial CommunicationInterfaces

CFC Logic

!


ANSI-No.

17.10.97en513all7

21, 21N

FL

85-21

SIPROTEC 7SA522 Scope of functions (1)

Distance Protection quadrilateral and/or MHO characteristic

full scheme measurement with sophisticated loop selection

three phase and single phase tripping

five independent zones and one controlled overreach zone

all zones can be set forward/reverse/non-directional

with/without parallel line compensation

special filtering for CVT transients

special algorithm for detection and compensation of CT saturation

Fault Locator with/without parallel line compensation

Universal teleprotection interface (PUTT, POTT, Blocking, Unblocking, DTT...)


17.10.97en513all8

50N, 51N, 67N

85-67N

WI

68

ANSI-No.


High resistance earth fault protection for earthed systems

directional and/or non-directional

4 stages

definite-time and/or inverse-time characteristic

high sensitivity (3 mA secondary)

backup protection running in parallel to the distance protection

Teleprotection interface for earth fault protection (Directional comparison, Blocking, Unblocking)

Weak infeed protection(Echo and Trip)

Power swing blocking/out-of-step tripping


ANSI-No.

50, 5150N-2, 51N-2

59

50HS

50-STUB

79

25

50BF


Overcurrent protection DMTL/IDMTL as parallel or emergency function

Overvoltage protection

Fast tripping with switch-onto-fault condition

STUB Bus Overcurrent protection

Single and three pole multishot automatic reclosure

Synchro-check

Circuit-breaker failure protection



Trip Circuit Supervision

Lock Out

Oscillographic Fault Recording

Voltage Phase Sequence

Interfaces Time synchronization (IRIG-B, DCF77)

User interface#1 (on the front for DIGSI 4)

User-(Service-)interface #2 (on the rear, DIGSI 4/Modem)

System interface (IEC60870-5-103/Profibus FMS*/others)

Remote relay interfaces #1 (planned for teleprotection)

Remote relay interfaces #2 (planned for teleprotection)

ANSI-No.

74TC

86

FR

47

* available in Version 4.2 approx. 1. Q/01


SIPROTEC 7SA522 Quadrilateral Zone Characteristic

X

R

forwards

forwards

reverse

reverse

LoadLoad

Z1

Z2

Z4

Z3

Z1B

Z5

Line


SIPROTEC 7SA522 MHO Zone Characteristic

X

R

Z1

Z2

Z4

Z1B

Z5Line

Z3 (if revers)

Load Load


MHO characteristic Effect of polarization

Example: 2 phase fault B-C

Symbols:

ZR zone setting

V BC measured fault voltage

I B, I C measured fault currents

k pol polarization factor (0.15%)

a > 90° and b < 90°--> internal fault

b

aWithout memorypolarization

With memorypolarization

Re( V )

V Pol

V BC

Z R x ( I B - I C)

Im( V )

delta V = Z R x (I B - I C) - V BC

kpol x (V BC, memory - V BC)


SIR=1 (A-G)

0

5

10

15

20

25

30

35

40

45

50

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100

% of zone setting

trip

pin

g t

ime (

ms)

EPAC 3000 Doku

SEL321 Doku

7SA522 gemessen

EPAC31/35

7SA522 - Trip time curves at SIR = 1


7SA522 - Parallel-line compensation: connection and setting

Q1

Q3

Q5

Q7

Q2

Q4

Q6

Q8

IL1(A)

IL2(B)

IL3(C)

L1 (A)L2 (B)L3 (C)

52 Circuit breaker

Line

Busbar

52 Circuit breaker

Parallel line

I4


7SA522 - Fault locator


7SA522 - Teleprotection Schemes

Configuration


Z1 Z1B

L1-E

L2-E

A B1 1

2 2

Z1Z1B

A1 trips single-phase in L1 with a phase-segregated L1-receive-signal Maximum of Selectivity

Note: 3 binary channels for both directions are requested or (in preparation) one serial link

7SA522 - Phase segregated Teleprotection


7SA522 - Teleprotection with three-terminal lines

Software provides teleprotection of three-terminal lines without additional logic


17.10.97en513ase2

7SA522 - Echo and Tripping in case of no-infeed or weak-infeedConfiguration

Settings

Note: The echo signal must be marshalled in addition to the send signal on the transmission signal contact

Matrix

The receive signal is derived from :

and

Phase segregated weak-infeed tripping

*Three-terminal schemes are supported as well

!


7SA522High Resistance Earth Fault Protection (1)

Earth (zero sequence) current protection, 4 stages 3 definite-time stages 1 inverse-time stage: IEC, logarithmic inverse or ANSI characteristic

this stage can also be used as a 4th definite-time stage Directional determination with 3V0 and/or Ipol of an earthed power

transformer Directional determination with V2 and I2 (negative sequence) Sensitive 3I0-measurement with a dynamic from 0.005 A to 100 x In Elimination of higher harmonics with special digital filters Inrush-stabilisation with I0/100Hz Teleprotection: Directional comparison, Blocking or Unblocking Operation with weak infeed trip and echo Instantaneous trip after switch-onto-fault


7SA522 High Resistance Earth Fault Protection (2)

3I0

T

T3I0>>

3I0>

T3I0>

T3I0>>>

3I0>> 3I0>>>

Definite-time characteristic



Inverse-time characteristic: IEC

3I0/Ip

T

Tp =1

b 200 a

Reset: b = 1.045 x 3I0/IP

Pickup: a = 1.1 x 3I0/IP



IEC-characteristic:

normal inverse: Tp

IpI

st *

1

14.002.0

very inverse: Tp

IpIst *1

5.13

extremly inverse: Tp

IpI

st *

1

802

long time inverse: Tp

IpIst *1

120

ANSI-characteristic:

DB

IpI

Ast

N*

1

Inverseshort inverse very inverselong inverse extremly inversemoderately inverse definite inverse

Logarithmic-inverse characteristic:

PI

IPITPITst

03

03ln*03max03 for t>T3I0Pmin, otherwise: t[s]=T3I0Pmin



Earth faultdirection

=

EF IE> Echo

3I0>>>EF>>> Trip

P

EFp Trip

Inrush-stabilisation

T(3I0/IN)

T

Tele-protection

T

SOTF

= &

&

3I0>>> Def. Time Stage

Inverse Time Stage

&

&

P

>EF>>> block

Direc. 3I0>>>

P Direc. 3I0p

>EFp block

P 3I0p

EF Fault Det.

>EF Trip rel.

3I0>> Def. Time Stage

3I0> Def. Time Stage

= Input signal(binary input)

P = Parameter = Output Signal(alarm, command)

P3146 AddTdelay



0 5 10 15 20 25 30 350

1

2

3

4

5

6

7

8

9

10t

3I0 / 3I0p

Example: t = 5.8 - 1.35 ln(3I0 / 3I0p)

T3I0pmax (P3145)

T3I0p (P3144)

3I0p(P3140)

T3I0min(P3141)

3I0p Startpoint(P3154)

Tripping characteristic Logarithmic Inverse



-160

-150

-140

-130

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

dB

0 1 2 3 4 5 6 7 8 9 10 11

f/fn

Filter characteristic for stages 3I0>>> and 3I0>>



Filter characteristic for stages 3I0> and Inverse time stage

-170

-160

-150

-140

-130

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10dB

0 1 2 3 4 5 6 7 8 9 10 11f/fn


7SA522 - STUB protection for 11/2-circuit breaker arrangement Busbar A

fee

de

r 1

fee

de

r 2

stub fault

IA

IB

Ik = IA+IB line isolator 1

line isolator 2

CB(A)

CB(C)

CB(B)

Busbar B

Release of STUB-stage with open line isolator:


Operating system monitoring Auxiliary voltage failure

Measured value detection

Buffer battery

Hardware–Watchdog

Software–Watchdog

Working memory

Program memory

Parameter memory

Sampling frequency

1/5 A–setting

Calibration data

Earth current transformer sensitive/normal

Modules (I/O Boards)

7SA522 - Monitoring

Plausibility monitoring Current sum

Current symmetry

Open conductor

Fuse Failure 1- / 2-pole failures

3-pole failures

Voltage sum

Voltage symmetry

Voltage phase rotation

!

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