Instruction manual –AQ F210 Feeder Protection IED
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1.
Earth fault is found in the protected line which causes directional earth fault protection
I0Dir> to start and calculate the operating time for the trip.
2.
I0Dir> trips and gives open command to the breaker open coil. Autoreclosing REQ2 is
initiated and AR running, AR2 Requested and Shot1 Running signals are activated.
3.
Circuit breaker is opened and I0Dir> Trip signal is released and simultaneously REQ2
signal for autorecloser is released. Recloser starts to calculate the Shot1 Dead Time for
closing the breaker.
4.
Dead Time for Shot1 is exceeded and autorecloser sends close request for the Object
breaker, the close conditions are met and the breaker close command is sent to breaker
close coil.
5.
Circuit Breaker is closed towards the fault which was not cleared by the Shot1 given
non-energized time and I0Dir> stage picks up and starts to calculate operating time for
trip. Close command is drop off after the breaker closed indication is received and the
autorecloser starts to calculate Reclaim time.
6.
I0Dir> trips and gives REQ2 request for autorecloser, autorecloser is calculating
Reclaim Time for Shot1 and while during this time new request is received recloser will
jump to next available Shot for this request. Shot2 is next which is allowed for REQ2
input and Shot2 Running signal is set to active and Shot1 Running is drop off.
7.
Circuit breaker is opened and I0Dir> Trip signal is released and simultaneously REQ2
signal for autorecloser is released. Recloser starts to calculate the Shot2 Dead Time for
closing the breaker.
8.
Dead Time for Shot2 is exceeded and autorecloser sends close request for the Object
breaker, the close conditions are met and the breaker close command is sent to breaker
close coil.
9.
Circuit breaker is closed and since fault cleared by the Shot2 given non-energized time
no pick-ups are detected Close command is drop off after the breaker closed indication
is received and the autorecloser starts to calculate Reclaim time for Shot2.
10.
Reclaim Time for Shot2 is exceeded and the reclosing cycle is ended. AR running,
Shot2 Running and REQ2 Running signals are reset and Reclaim Time for the
Autorecloser application starts. Difference in between of the autoreclosing and shot
specific reclaim times is that if fault is returning in shot specific reclaim time autorecloser
jumps to next shot. If a fault return after successful cycle and Autoreclosing reclaim time
is running recloser will go directly to final trip state and lock-out state. This behavior can
be controlled with settings. Both of these reclaim times can be set to 0 when they are
not needed. Autoreclosing will skip all timers set to 0.
11.
Autoreclosing Reclaim Time is exceeded and Autorecloser is set to Ready state waiting
for next request.