Woodward highprotec MRI4, User Manual

Page: 518 / 727

Protective Elements
11 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.
The autoreclose function is not initiated from any initiate (start) functions.
No external or internal AR blocking signals are present.
12
Run
This is the first subordinate state after the autoreclosure process goes from »R
EADY
« into »R
UN
« state triggered
from the first AR initiate event. During the »R
UNNING
« state, the auto reclosure element supervises the trip signal of
the initiate function while a preset fault timer is timing. The autoreclosure element transfers to the »W
AITING
B
KR
O
PEN
« state by receiving the trip signal if the fault timer does NOT time out and there are no other blocking and
lockout conditions.
13 Waiting Bkr Open
While in the »W
AITING
B
KR
O
PEN
« state, the autoreclosure supervises if the breaker is really tripped (open) after
receiving the trip flag of the initiate protection function within a preset breaker supervision time (200ms). If this is the
case, the autoreclosure starts the programmed dead timer and goes to the dead timing state »
t-dead«.
14 t-dead
While in the dead timing state »
t-dead«, the preset dead timer for current AR shot is timing and cannot be
interrupted unless there are any blocking or lockout conditions coming.
After dead timer elapses, the autoreclosure issues the breaker reclosing command and goes into the next state:
»R
ECLOSING
«, only if the following conditions are met:
The breaker is in open position,
The breaker is ready for next reclosing operation (if the CB Ready logic input is used)
No pickup from current (assigned) AR initiate function(s)
518 MRI4 DOK-HB-MRI4-2E