Current Reversal And Weak-End Infeed Logic For Distance Protection 3-Phase Zcrwpsch; Current Reversal Logic; Weak End Infeed Logic - ABB Relion 670 Series Commissioning Manual

1MRK 504 165-UEN E
11.11.3 Current reversal and Weak-end infeed logic for distance
protection 3-phase ZCRWPSCH
Prepare the IED for verification of settings as outlined in section
section
Values of the logical signals for ZCRWPSCH 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

It is possible to check the delay of the CS send signal with
reverse to a forward fault.
By continuously activating the CR input and changing from a reverse to a forward fault, the
tDelayRev can be checked.
delay
Checking of current reversal
1. Set the healthy condition to an impedance at 50% of the reach of the reverse zone
connected to IRV.
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
carrier accelerated trip (TRIP) recorded for the permissive overreach scheme
communication.
5. Restore the forward and reverse zone timer to its original setting.
11.11.3.2

Weak end infeed logic

Weak-end infeed logic at permissive overreach schemes
Transformer protection RET670
Commissioning manual
"Preparing for test" in this chapter.
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
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Testing functionality by secondary injection
"Requirements"
tDelayRev by changing from a
tDelayRev set value.
tDelayRev setting longer than the
Section 11
M14947-2 v7
and
M14947-8 v3
M14947-13 v9
M14947-37 v2
M14947-39 v5
231