11.11.3 Current reversal and Weak-end infeed logic for distance
protection 3-phase ZCRWPSCH
M14947-2 v7
Prepare the IED for verification of settings outlined in Section "Preparing the IED
to verify settings".
Values of the logical signals for ZCR
WPSCH are available on the local HMI under
Main menu/Tests/Function status / Scheme communication / ZCRWPSCH(85) /
ZCRWPSCH:1.
The Signal Monitoring in PCM600 shows signals that are available on the Local
HMI.
The current reversal logic and the weak-end infeed functions are tested during the
secondary-injection test of the impedance or overcurrent protection zones together
with the scheme communication logic for the distance protection function
ZCPSCH.
11.11.3.1 Current reversal logic
M14947-8 v3
It is possible to check the delay of the CS send signal with tDelayRev by changing
from a reverse to a forward fault.
By continuously activating the CR input and changing from a reverse to a forward
fault, the delay tDelayRev can be checked.
Checking of current reversal
M14947-13 v9
The reverse zone timer must not operate before the forward zone
fault is applied. The user might need to block the reverse zone timer
setting during testing of current reversal.
The forward zone timer must be set longer than the tDelayRev set
value.
1. Set the healthy condition to an impedance at 50% of the reach of the reverse
zone connected to IR
V
.
2. Activate the receive (CRL) signal.
3. After the start condition is obtained for reverse zone, apply a fault at 50% of
the reach of the forward zone connected to WEIBLK2.
4. Check that correct trip outputs and external signals are obtained for the type
of fault generated. The operation time should be about the tDelayRev setting
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 241
Commissioning manual
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