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14.2
14.3
Scheme communication logic for distance
protection functions (ZCOM)
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.
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.
Chapter 10
Verifying settings by secondary
injection
89
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