ABB Relion 670 Series Commissioning Manual page 231

1MRK 506 371-UUS E
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 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
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
1. Check the blocking of the echo with the injection of a CRL signal >40ms after a reverse fault
is applied.
2. Measure the duration of the echoed CS signal by applying a CRL receive signal.
3. Check the trip functions and the voltage level for trip by reducing a phase voltage and
applying a CRL receive signal.
Testing conditions
Only one type of fault is sufficient, with the current reversal and weak-end infeed logic for distance
protection function ZCRWPSCH (85). Apply three faults (one in each phase). For phase A-G fault,
set these parameters:
Table 40: Phase A-G parameter values
Phase
A
B
C
If wanted, change all settings cyclically for other faults (BG andCG).
The setting parameter
Line distance protection REL670
Commissioning manual
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
I (Amps) Phase-angle
(Deg)
0 0
0 240
0 120
WEI is set to Echo & Trip .
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Testing functionality by secondary injection
tDelayRev set value.
tDelayRev setting longer than the carrier
V (Volts) Phase-angle
(Deg)
Set less than 0
UPN<PU27PN
69.3 240
69.3 120
Section 11
M14947-13 v9
M14947-37 v2
M14947-39 v5
M14947-52 v7
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