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14
14.1
88
Scheme communication logic for distance
protection functions (ZCOM)
Scheme communication logic for distance
protection functions (ZCOM)
Prepare the terminal for verification of settings as outlined in section "Preparing for
test" in this chapter.
Check the scheme logic during the secondary injection test of the impedance-measuring
zones and the high-speed complementary zones. For details see the ordering sheets for
each particular REx 5xx terminal.
Activating the different zones verifies that the ZCOM-CS signal is issued from the in-
tended zones. The ZCOM-CS signal from the independent tripping zone must have a
tSendMin minimum time.
Check the tripping function by activating the ZCOM-CR and ZCOM-CRG inputs with
the overreaching zone used to achieve the ZCOM-CACC signal.
It is sufficient to activate the zones with only one type of fault with the secondary in-
jection.
Testing permissive underreach
Procedure
1.
Activate 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 other zones operate according to their zone timer
and that the carrier send (ZCOM-CS) signal is obtained only
for the zone configured to give the actual signal.
6.
Deactivate the carrier receive (ZCOM-CR) signal of the termi-
nal.
7.
Check that the trip time complies with the zone timers and
that correct trip outputs, external signals, and indication are
obtained for the actual type of fault generated.
Chapter 10
Verifying settings by secondary
injection
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