Local Acceleration Logic Zclcpsch - ABB REC670 Applications Manual

Section 15
Scheme communication
15.3
15.3.1
15.3.2
15.3.3
444
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.

Local acceleration logic ZCLCPSCH

Identification
Function description
Local acceleration logic
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.
Setting guidelines
The parameters for the local acceleration logic functions are set via the local HMI
or PCM600.
Set ZoneExtension to On 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 On when the acceleration shall be controlled by loss-of-load in
healthy 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 127.
IEC 61850 IEC 60617
identification identification
ZCLCPSCH -
1MRK 511 401-UEN A
SEMOD52894-1 v4
M14860-1 v4
ANSI/IEEE C37.2
device number
-
M13821-3 v3
M13854-4 v3
Bay control REC670 2.2 IEC
Application manual