Auto-Reclose Function - ABB REF 610 Technical Reference Manual

REF 610
4.1.4.8.
28
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)
Light reference level
(automatically adjusted)
Light sensor 1
Light reference level
(automatically adjusted)
Light sensor 2
Fig. 4.1.4.7.-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 REF 610 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. Disable 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. Disable will also interrupt
any ongoing shot.
SGB1..5/9
SGF4/6
1MRS 755535
SGF3/6
Arc Trip
0
25ms
Light Signal Output
SGF3/7