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Test Switches

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Principles of system protection technology

Test Switches

Trainer: Hermann Paetzold

PTD PA16

Phone: +49-911/433-8321

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Commissioning test

Functional check (every two years, without tools)

-Comparing measured values (current, voltage)

- Trip test- Reading the event buffer- Verifying the protective fault message

Protection test ( about every five years )- Testing a measuring point (current, voltage)- Testing all used BIs and BOs- Interface testing

Testing Protective Relays

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Enables easy, reliable, and quick test with currents andvoltages to verify correct A/D and calculation.

Interrupts the TRIP and CLOSE commands to the circuit

breaker

Visual- and electrical indication of test position

Pre-assembled connection to the portable test set

Design and connection matches all digital protection devices

Protection Test via Test Switch

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The right test switch for application to every protection device

Feeder protection with starpoint inside the test switch

Feeder protection with open star point in the test switch

Test switch for transformer differential protection

Test switch design with additional contacts and functions

Test Switch Versions

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Prfung der EingangsmegrenTesting the Measured Input Values

Test switch

1

2

3

Betrieb

Test

Prfschalter

X2Schutzrelais

X2

4

- S1

L1

L2

L3 Operation

Protect. relay

Test switch

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Prfschalter mit aufgelstem Sternpunkt im Strommekreis (Betrieb)

Test Switch with Open Starpoint in the Current MeasuringCircuit (Operation)

1

2

3

Betrieb

Test

Prfschalter

X2 Schutzrelais

4

- S2

L1

L2

L3

L1

L2

L3

N

Zu weiteren

Schutzgerten

Test switch

Operation

Protect. relay

To other protect. relays

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Prfschalter mit aufgelstem Sternpunkt im Strommekreis (Test)

1

2

3

Betrieb

Test

Prfschalter

X2Schutzrelais

4

- S2

L1

L2

L3

L1

L2

L3

N

Zu weiterenSchutzgerten

Protect. relay

Test switch

Operation

To other prot. relays

Test Switch with Open Starpoint in the Current MeasuringCircuit (Test)

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Unterbrechung AUS / EIN bei Prfung mit PrfschalterInterruption of TRIP / CLOSE During Test via Test Switch

Protective relayTrip Trip Trip

Operation

Circuit breakertrip

CB CloseTestindication

indication

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The TIRP command contact remains closed - the CB closingcircuit remains open until reset

It is used to:

- output the TRIP command continuously- disable the CLOSE command

Only upon acknowledgement is the latched command reset.

Latching takes place:- in the SW of the protection device ( SIPROTEC 4)- via separated lock-out relays which are mechanically linked.

Reset: electrically or hand reset

Lock-Out Function

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Lock Out RelaisLOCK-OUT RELAY

Kontakte dargestellt

bei Stellung Reset

L+

LS

EIN

Schutz

AUS

Reset

R S

L-

LS

AUS

1 L+

Reset

LS

EIN

LockOutRelais

Close

CloseTrip

ProtectionTrip

Lock-outrelay

Close

Contacts shown atreset position

CB

CB CB

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The trip circuit is monitored as to:- Presence of the control voltage- Interruption in the wiring- Interruption in the trip coil of the CB

Supervision takes place:- in the protection device via BI ( advantage of self-monitoringand oscillographic record with time stamp)

- with separated special monitoring relays

The trip-circuit supervision is possible for phase-selectivetripping and / or three-phase tripping

Trip-circuit Supervision

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Auslsekreisberwachung im Schutzgert mit zwei Binreingngen

~2 mA

Trip-circuit Supervision in the Protection Device with Two Binary Inputs

AUS

Schutz

StU

L+

BE1

BE2

HIKO1 HIKO2

LSS

L-

LS

EIN

Meldung

SIPROTEC

AUSSchutz

StU

L+

BE1

BE2

HIKO1 HIKO2

LSS

L-

LS

AUS

Meldung

SIPROTEC

BI1 BI1

BI2 BI2

CB CB

TripClose

Aux.

Cont.1Aux.

Cont.1

Aux.

Cont.2Aux.

Cont.2

indication indication

TRIP

protectionTRIPprotection

CBTCCBTC

VCTRL

VCTRL

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Trip-circuit Supervision in the Protection Device with One Binary Inp

~2 mA

AUS

Schutz

StUL+

BE1

HIKO1 HIKO2

LSS

L-

LS

EIN

Meldung

SIPROTEC

R

EIN AUS

AUS

Schutz

StU

L+

BE1

HIKO1 HIKO2

LSS

L-

LS

AUS

Meldung

SIPROTEC

REIN AUS

VCTRLVCTRL

BI1 BI1protection protectionTRIP TRIP

indication indication

Trip Trip

Trip

CB CB

Close

CBTC CBTC

Close Close

Aux.

Cont.1

Aux.

Cont.1

Aux.

Cont.2

Aux.

Cont.2

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AuslsekreisberwachungTrip-circuit Supervision

AUSSchutz

L+

HiKo1

L-

LS

EIN

Meldung

HiKo2Aux.Cont.1

Aux.Cont.2

indication

TRIP

protection

CB

Close