Local Acceleration Logic Zclcpsch; Identification; Application; Setting Guidelines - ABB Relion REC670 Applications Manual

Section 14
Scheme communication
tPickUpWEI to 10 ms, a short delay is recommended to avoid that spurious carrier received
Set
signals will activate WEI and cause unwanted carrier send (ECHO) signals.
Set the voltage criterion
voltage
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.
14.3

Local acceleration logic ZCLCPSCH

14.3.1

Identification

Function description
Local acceleration logic
14.3.2

Application

The local acceleration logic (ZCLCPSCH) is used in those applications where conventional
teleprotection scheme is not available (no communication channel), but the user still require
fast clearance for faults on the whole line.
This logic enables fast fault clearing during certain conditions, but naturally, it can not fully
replace a teleprotection scheme.
The logic can be controlled either by the autorecloser (zone extension) or by the loss-of-load
current (loss-of-load acceleration).
The loss-of-load acceleration gives selected overreach zone permission to operate
instantaneously after check of the different current criteria. It can not operate for three-phase
faults.
14.3.3

Setting guidelines

The parameters for the local acceleration logic functions are set via the local HMI or PCM600.
ZoneExtension to On when the first trip from selected overreaching zone shall be
Set
instantaneous and the definitive trip after autoreclosure a normal time-delayed trip.
LossOfLoad to On when the acceleration shall be controlled by loss-of-load in healthy
Set
phase(s).
LoadCurr must be set below the current that will flow on the healthy phase when one or two of
the other phases are faulty and the breaker has opened at remote end (three-phase). Calculate
the setting according to equation 130.
350
UPP< and UPN< for the weak-end trip to 70% of the system base
UBase . The setting should be below the minimum operate voltage of the system but
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.
IEC 61850 IEC 60617
identification identification
ZCLCPSCH -
1MRK 511 358-UEN A
SEMOD52894-1 v4
ANSI/IEEE C37.2
device number
-
Application manual
M14860-1 v4
M13821-3 v3
M13854-4 v3