ABB REL 505-C1 2.3 Series - Testing Permissive Overreach; Testing Blocking Scheme

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Scheme communication logic for distance
protection functions (ZCOM)
Chapter 10
Verifying settings by secondary
injection
14.2 Testing permissive overreach
Procedure
1. Activate the carrier receive (ZCOM-CR) signal of the terminal.
2. Supply the relay with healthy conditions for at least two sec-
onds.
3. Apply a fault condition within the permissive zone.
4. Check that correct trip outputs, external signals, and indica-
tion are obtained for the actual type of fault generated.
5. Check that the other zones operate according to their zone
timer and that the carrier send (ZCOM-CS) signal is obtained
only for the zones that are configured to give the actual sig-
nal.
6. Deactivate the carrier receive (ZCOM-CR) signal of the termi-
nal.
7. Supply the relay with healthy conditions for at least two sec-
onds.
8. Apply a fault condition within the permissive zone.
9. Check that trip time complies with the zone timers and that
correct trip outputs, external signals, and indication are ob-
tained for the actual type of fault generated.
14.3 Testing blocking scheme
Procedure
1. Deactivate the carrier receive (ZCOM-CR) signal of the termi-
nal.
2. Supply the relay with healthy conditions for at least two sec-
onds.
3. Apply a fault condition within the forward directed zone used
for scheme communication tripping.
4. Check that correct trip outputs and external signals are ob-
tained for the type of fault generated and that the operate time
complies with the tCoord timer (plus relay-measuring time).
5. Check that the other zones operate according to their zone
times and that a carrier send (ZCOM-CS) signal is only ob-
tained for the reverse zone.
6. Activate the carrier receive (ZCOM-CR) signal of the terminal.
7. Apply a fault condition in the forward directed zone used for
scheme communication tripping.