ABB REL670 2.2 IEC - Local Acceleration Logic ZCLCPSCH

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