Phase Segregated Scheme Communication Logic For Distance Or Overcurrent Protection Zpcpsch; Function Revision History; Testing Permissive Underreaching; Testing Permissive Overreaching - Hitachi RET670 Commissioning Manual

Section 11
Testing functionality by secondary injection
11.12.2 Phase segregated scheme communication logic for distance or
overcurrent protection ZPCPSCH
Prepare the IED for verification of settings outlined in Section
Check the scheme logic during the secondary injection test of the impedance protection functions.
Activating of the different zones and phases verifies that the CSLx signal are issued from the
intended zones. The CSLx signal from the independent tripping zone must have a tSendMin
minimum time.
Check the tripping function by activating the CRLx inputs with the overreaching zone used to achieve
the CACCLx signals.
It is sufficient to activate the zones with all types of fault with the secondary injection.
11.12.2.1

Function revision history

Document
revision
A
B
C
D
E
F
G
H
J
11.12.2.2

Testing permissive underreaching

1. Activate the receive (CRLx) signal in the IED.
2. Apply healthy normal load conditions to the IED for at least two seconds.
3. Apply a fault condition within the permissive zone.
4. Check that correct trip outputs, external signals, and indications are obtained for all the actual
types of fault generated.
5. Check that other zones operate according to their zone timers and that the send (CSLx) signal
is obtained only for the zone and phase configured to generate the actual signal.
6. Deactivate the receive (CRLx) signal in the IED.
7. Check that the trip time complies with the zone timers and that correct trip outputs, external
signals, and indications are obtained for the actual type of fault generated.
11.12.2.3

Testing permissive overreaching

1. Activate the receive (CRLx) signal in the IED.
2. Apply healthy normal load conditions to the IED for at least two seconds.
3. Apply a fault condition within the permissive zone.
252
Product History
revision
2.2.1 -
2.2.1 -
2.2.2 -
2.2.3 -
2.2.3 -
2.2.4 -
2.2.4 -
2.2.4 -
2.2.5 Added separate DOs for teleprotection permissive (TxPrm & RxPrm1), blocking (TxBlk &
RxBlk1) and direct trip (TxTr & RxTr1) transmit and receive signals in accordance with
61850 Ed 2.0.
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