Scheme Communication; Scheme Communication Logic For Distance Or Overcurrent Protection Zcpsch; Testing Permissive Underreaching - ABB rec670 Commissioning Manual

1MRK 511 360-UEN A
10.10
10.10.1
10.10.1.1
Bay control REC670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
Values of the logical signals are available on the local HMI under Main menu/Tests/
Function status/Control/Apparatus control/Interlocking. The Signal Monitoring
in PCM600 shows the same signals that are available on the local HMI.
The interlocking function consists of a bay-level part and a station-level part. The
interlocking is delivery specific and is realized by bay-to-bay communication over the
station bus. For that reason, test the function in a system, that is, either in a complete
delivery system as an acceptance test (FAT/SAT) or as parts of that system.

Scheme communication

Scheme communication logic for distance or overcurrent
protection ZCPSCH
Prepare the IED for verification of settings outlined in section
verify settings".
Check the scheme logic during the secondary injection test of the impedance or
overcurrent protection functions.
Activation of the different zones verifies that the CS signal is issued from the intended
zones. The CS signal from the independent tripping zone must have a tSendMin
minimum time.
Check the tripping function by activating the CR and CRG inputs with the
overreaching zone used to achieve the CACC signal.
It is sufficient to activate the zones with only one type of fault with the secondary
injection.

Testing permissive underreaching

1. Activate the receive (CR) 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
the actual type of fault generated.
5. Check that other zones operate according to their zone timers and that the send
(CS) signal is obtained only for the zone configured to generate the actual signal.
6. Deactivate the receive (CR) 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.
Section 10
"Preparing the IED to
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