086371-502 ABB PLC NEW AND ORIGINAL
The master reclosure function sends an active ‘DelFlwr’ signal to the 086371-502 I/P of the follower to delay its ‘Close CB’ command to the follower CB until the master reclosure function issues the ‘Close CB’ command, which is followed by a wait time of 300 ms as a precaution to allow time for a successful reclosure. If the reclosure is unsuccessful, the output remains high until the signal ‘Def.Trip’ is activated (the ‘DelayFlwr’ signal resets and ‘Blk to Flwr’ signal is generated).Should this signal reset before the end of the follower dead time,the close command to the follower CB is issued at the end of the dead time.
086371-502 ABB PLC NEW AND ORIGINAL
086371-502 ABB PLC NEW AND ORIGINAL
Observe the following in connection with a duplex scheme:
For the 086371-502 to operate correctly, the corresponding CB signals must be connected to the ‘CB open’ and ‘CB2 open’ inputs for the duplex logic (setting to ‘off’ disables the duplex logic). Follow the procedure below, if separate ‘CB ready’ and ‘CB open’ signals are not available from the circuit-breakers:
Connect the two circuit-breaker signalling contacts ‘CB ready’ (air-pressure or spring charging) and ‘CB closed’ in series. For this, ‘t Close’ must be set longer than the maximum spring charging time to suppress the definitive trip signal in the case of a successful reclosure.
Assign the combined signals to the corresponding ‘CB ready’ inputs.
Assign the same signals but inverted to the corresponding ‘CB open’ inputs.
086371-502 ABB PLC NEW AND ORIGINAL
086371-502 ABB PLC NEW AND ORIGINAL
Maximum fault duration for a reclosure attempt ‘t Oper’
If 086371-502 has persisted for some time, the probability of a successful reclosure reduces. The likelihood of the power system becoming unstable is also greater for an unsuccessful auto-reclosure attempt following a fault which has persisted for a long period. It is for these reasons that the time after the inception of a fault during which reclosure can be initiated is limited. The fault duration is set using parameter ‘t Oper’.The timer for the fault duration is started by the pick-up signal from the protection function (Start). Faults resulting in tripping after ‘t Oper’ are locked out (‘Def. Trip’) and reclosure does not take place.Should the fault duration time expire before the protection trips,auto-reclosure is blocked and the reclaim time is started.
086371-502 ABB PLC NEW AND ORIGINAL
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