Current Reversal Logic - ABB REL670 2.2 IEC Applications Manual

1MRK 506 369-UEN B
16.3.3.1
16.3.3.2
16.4
16.4.1
Line distance protection REL670 2.2 IEC
Application manual

Current reversal logic

The forward zone timer must be set longer than the tDelayRev set
value.
Set CurrRev to On to activate the function.
Set tDelayRev timer of the maximum reset time for the communication equipment
that gives the carrier receive (CRL) signal plus 30 ms. A minimum setting of 40 ms
is recommended, typical 60 ms.
A long tDelayRev setting increases security against unwanted tripping, but delays
the fault clearing time in case of a fault from one line that evolves to the other one.
The probability of this type of fault is small. Therefore set tDelayRev with a good
margin.
Set the pick-up delay tPickUpRev to <80% of the minimum sum of breaker operate
time + communication delay time, but with a minimum of 20 ms.
Weak-end infeed logic
Set WEI to Echo, to activate the weak-end infeed function with only echo function.
Set WEI to Echo&Trip to obtain echo with trip.
The tPickUpWEI is the on-time delay to activate the weak-end infeed function. Set
tPickUpWEI to 10 ms, a short delay is recommended to avoid that spurious carrier
received signals will activate WEI and cause unwanted carrier send (ECHO)
signals.
When single phase tripping is required, a detailed study of the
voltages during phase-to-phase and phase-to-earth faults should be
done, at different fault locations.
Current reversal and weak-end infeed logic for
phase segregated communication ZC1WPSCH
Identification
Function description
Current reversal and weak-end infeed
logic for phase segregated
communication
Scheme communication
IEC 61850 IEC 60617
identification identification
ZC1WPSCH
Section 16
M13856-6 v7
M13856-10 v8
SEMOD155635-1 v2
SEMOD156467-2 v2
ANSI/IEEE C37.2
device number
- 85
717