Woodward highprotec MRI4, User Manual

Page: 522 / 727

Protective Elements
Auto Reclosing States during manual breaker closing
Protection Trip while Manual Close Blocking time is Timing
What happens if while the timer manual close block time is timing down the protective device gets a trip signal?
While the timer manual close block time is timing, any trip during this time period trips the breaker. The manual
close block timer doesn´t care about that and timing further until it times out.
After it times out, the AR-module looks at the breaker status again, and sees that the breaker is open. The AR goes
to the »STANDBY« state, no autoreclose is possible (Note: The AR doesn´t go to »LOCKOUT« state!)
522 MRI4 DOK-HB-MRI4-2E
Protection Trip
AR - Module states
t
0
1
t-Blo after CB man ON
Circuit Breaker Manual Close
t
0
1
CB Pos
t
0
1
t-Blo after CB man ON
Standby
Pos OFF
Pos ON
Standby
Circuit Breaker Manual Close
AR - Module states
t
0
1
t-Blo after CB man ON
t
0
1
t-Blo after CB man ON
Pos OFF
Pos ON
Standby Ready
CB Pos