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
16.5.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Local acceleration logic ZCLCPSCH - -
16.5.2 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.
16.5.3 Setting guidelines
The parameters for the local acceleration logic functions are set via the local HMI or
PCM600.
Set ZoneExtension to Enabled when the first trip from selected overreaching zone shall be
instantaneous and the definitive trip after autoreclosure a normal time-delayed trip.
Set LossOfLoad to Enabled when the acceleration shall be controlled by loss-of-load in
healthy phase(s).
Section 16 1MRK 506 369-UUS -
Scheme communication
768 Line distance protection REL670 2.2 ANSI
Application manual
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