Woodward highprotec MRI4, User Manual

Page: 514 / 727

Protective Elements
In general, the autoreclosure function is only active (will be initiated) when all of the following conditions are met:
Autoreclosure function is enabled (In AR General Setting: Function =active)
The breaker (CB) is configured within the “AR/General Settings“.
Autoreclosure is not blocked by the blocking inputs (ExBlo1/2).
1 Standby
The autoreclosure is in this state when the following conditions are met:
The breaker is in the open position.
The autoreclose function is not initiated from any initiate (start) functions.
No external or internal AR blocking signals are present.
No autoreclose shot operation is possible if the autoreclose function is within Standby
state.
2
t-manual close block
Suppose that the breaker is open and the AR state is in Standby state. Then the breaker is closed manually. The
event “CB Pos On” starts a Manual-Close-Blocking timer and results in a state transition from »S
TANDBY
« to a transit
state - »
T
-B
LO AFTER
CB
MAN
ON«. The autoreclosure function changes into the »R
EADY
« state only as the Manual-
Close-Blocking timer elapses and the breaker is closed. By means of the manual close blocking timer a faulty
starting of the autoreclose function in case of a Switch-OnTo-Fault condition is prevented.
3 Ready
An activated autoreclose function is considered to be in »R
EADY
« state when all of the following conditions are true:
The breaker is in closed position.
The Manual-Close-Block-timer elapses after a breaker manual/remote close operation.
514 MRI4 DOK-HB-MRI4-2E