ABB Relion 650 Series REL650, Commissioning Manual

Page: 135 / 176

Values of the logical signals for ZCRWPSCH (85) are available on the local HMI
under
Main menu/Tests/Function status/Scheme communication/ZCRWPSCH(85)/
1:ZCRWPSCH . The Signal Monitoring in PCM600 shows the same 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 (85).
6.9.2.1 Current reversal logic
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
The reverse zone timer must not operate before the forward zone fault
is applied. The user might need to increase the reverse zone timer
setting during testing of current reversal.
The forward zone timer must be set longer than the tDelayRev setting.
1. Activate the receive (CRL) signal.
2. Set the healthy condition to an impedance at 50% of the reach of the reverse zone
connected to IRVL.
3. After the pickup 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 longer than the carrier
accelerated trip (TRIP) previously recorded for permissive scheme communication.
5. Restore the forward and reverse zone timer to its original setting.
6.9.2.2 Weak-end infeed logic at permissive schemes
1MRK 506 331-UUS A
Section 6
Testing functionality
127
Commissioning Manual