Auto-Reclose Function; Block Diagram Of The Arc Protection - ABB REF610 Technical Reference Manual

REF610 REF610
5.1.4.8.
38
Feeder Protection Relay
Technical Reference Manual - ANSI Version
The warning signal generated in case of continuous light on the light
sensor inputs can be routed to SO2 by setting switch SGF1/8 to 1.
Arc50P (setting)
-
Ip (max. measured
+
phase current)
Arc50N (setting)
-
I0 (measured)
+
Remote Light Signal
(binary input)
SGB1..5/9
Light reference level
(automatically adjusted)
-
Light sensor 1
+
Light reference level
(automatically adjusted)
-
Light sensor 2
+
Fig. 5.1.4.7.-1

Block diagram of the arc protection

Auto-reclose function

The vast majority of MV overhead line faults are transient and automatically cleared
by momentarily de-energizing the line. De-energizing of the fault location for a
selected time period is implemented through automatic reclosing, during which
most faults can be cleared.
At a permanent fault, auto-reclosing is followed by definite tripping. A permanent
fault must be located and cleared before the fault location can be re-energized.
The auto-reclose (AR) function of REF610 can be used with any circuit breaker
suitable for auto-reclosing. The AR function provides three programmable auto-
reclose shots and can thus be set to perform one to three successive auto-reclosures
of desired type and duration, one high-speed and one delayed, for instance.
The AR function can be initiated by pickup and trip signals from certain overcurrent
and ground-fault protection elements. Consequently, tripping of the arc protection
element, for instance, does not initiate the AR function. Initiation is also possible
from an external device via a digital input.
The AR function can be disabled (AR Disable) by trip signals from certain
protection elements or via a digital input. Disabled is advantageous with tripping
faults as this type of fault cannot be cleared during an auto-reclose sequence.
Tripping faults are detected by the CBFAIL, for instance. Disabled will also
interrupt any ongoing shot.
SGF3/6
0
25 ms
Light Signal Output
SGF4/6
SGF3/7
1MRS755535
Arc Trip
A060583