GE D90 Plus Instruction Manual page 356

CONTROL ELEMENTS
Breaker block
Reset after reclosure
346
A reclose command to a breaker is inhibited if it receives a user-defined block input or if it
is out-of-service. A logic circuit also is provided that inhibits a breaker reclose if that
breaker was open in advance of a reclose initiate input to the recloser. This logic circuit
resets when the breaker is closed.
Figure 289: Autoreclose breaker block logic
For single-breaker reclosing on a transient fault, the reset timer is started when a reclose
output signal is sent to close the breaker. If the reclosure sequence is successful (there is no
initiating signal and the breaker is closed) the reset timer times out, returning the scheme
to the reset state with the shot counter set to 0 and ready for a new reclose cycle.
In two-breaker schemes, if one breaker is in the out-of-service state and the other is closed
at the end of the reset time, the scheme is also reset. If at the end of the reset time at least
one breaker, which is not in the out-of-service state, is open the scheme is sent to lockout.
The reset timer is stopped if the reclosure sequence is not successful: an initiating signal
present or the scheme is in lockout state. The reset timer is also stopped if the breaker is
closed manually or the scheme is otherwise reset from lockout.
Figure 290: Autoreclose reset logic
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION