10.11.2 Phase segregated scheme communication logic for distance
or overcurrent protection ZC1PPSCH
Prepare the IED for verification of settings outlined in section "Preparing the IED to
verify settings".
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.
10.11.2.1 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.
10.11.2.2 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.
4. Check that correct trip outputs, external signals, and indication are obtained for
the all actual types of fault generated.
5. Check that the other zones operate according to their zone timer and that the send
(CSLx) signal is obtained only for the zones and phases that are configured to
give the actual signal. Also the zone connected to CSLx underreach is giving
CSLx in this mode.
6. Deactivate the IED receive (CRLx) signal.
1MRK 506 355-UEN A Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC 213
Commissioning manual
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