ABB REL670 2.2 IEC, Applications Manual

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Set tDelayRev timer at the maximum reset time for the communication equipment
that gives the carrier receive (CRLx) 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 delay
the fault clearing in case of a fault developing from one line to involve 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 OperationWEI to Echo , to activate the weak-end infeed function with only
echo function.
Set OperationWEI to Echo&Trip to obtain echo with trip.
Set tPickUpWEI to 10 ms , a short delay is recommended to avoid that spurious
carrier received signals will activate WEI and cause unwanted communications.
Set the voltage criterion UPP< and UPE< for the weak-end trip to 70 % of the
system base voltage UBase . The setting should be below the minimum operate
voltage of the system but above the voltage that occurs for fault on the protected
line. The phase-to-phase elements must be verified to not operate for phase to earth
faults.
When single phase tripping is required a detailed study of the
voltages at phase-to-phase respectively phase-to-earth faults, at
different fault locations, is normally required.
16.5 Local acceleration logic ZCLCPSCH
SEMOD52894-1 v4
16.5.1 Identification
M14860-1 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Local acceleration logic ZCLCPSCH - -
16.5.2 Application
M13821-3 v4
The local acceleration logic (ZCLCPSCH) is used in applications where a
conventional teleprotection scheme is not available (no communication channel),
but where the user still requires fast clearance for faults on the whole line.
Section 16
1MRK 506 369-UEN B
Scheme communication
720 Line distance protection REL670 2.2 IEC
Application manual