Weak-End Infeed Logic - ABB REL650 Applications Manual

1MRK 506 334-UUS A
12.3.3.2
12.4
12.4.1
12.4.2
Application manual
tPickUpRev: Sets the pick-up delay tPickUpRev to <80% of the breaker operate time, but
with a minimum of 20 ms.

Weak-end infeed logic

WEI: Set WEI to Echo, to activate the weak-end infeed function with only echo function.
To activate echo with trip set WEI to Echo & Trip.
tPickUpWEI: Set tPickUpWEI = 10 ms, a short delay is recommended to avoid that
spurious carrier received signals will activate WEI and cause unwanted signals.
PU27PP and PU27PN: Set the voltage criterion PU27PP and PU27PN for the weak-end
trip to 70% of the system base voltage VBase. 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-ground
faults.
Local acceleration logic ZCLCPLAL
Identification
Function description
Local acceleration logic
Application
The local acceleration logic (ZCLCPLAL) 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.
Scheme communication
IEC 61850 IEC 60617
identification identification
ZCLCPLAL -
Section 12
ANSI/IEEE C37.2
device number
-
405