The LFAA auto-reclose relay provides facilities for
single or two-shot reclosures of one or two circuit
breakers following their tripping for a fault on an
overhead line. The reclosures can be selected to
be either high speed single-phase, or high speed
or delayed three-phase.
When three-phase reclosure is desired the
equipment will convert any single or two-phase
LFZR111
Provides single phase or three
phase tripping with selectable DEF
protection. It can use shared or
independent signalling channels.
tripping into three-phase tripping before initiating
the reclosure. For schemes with two circuit
breakers the reclosure of the second circuit
breaker can be either simultaneous with the first
circuit breaker or it can be sequential. In the latter
case the reclosure of the second circuit breaker
must naturally be a delayed three phase
reclosure.
ONE BREAKER SCHEMES ( LFAA 101)
> Single shot scheme:
ï ¿ ½ single phase auto-reclose
ï ¿ ½ single phase or three phase ï ¿ ½ auto reclose, depending on type of fault
ï ¿ ½ three phase auto-reclose for all types of fault
> Two shot scheme:
Any of the above cycles for the first shot, followed by delayed three- phase
auto-reclose if protection re- operates during the reclaim time after the first
reclose
TWO BREAKER SCHEMES ( LFAA 102)
> Combinations of single and three phase auto-reclose as above
> Circuit breakers can be closed simultaneously or sequentially on the first shot |
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