AN INVESTIGATION INTO BREAKER RECLOSURE STRATEGY FOR ADAPTIVE SINGLE POLE AUTORECLOSING

The effectiveness of single pole autoreclosure (SPAR) in maintaining p ower system stability is largely determined by the speed with which se condary are extinction, and hence autoreclosure, can be achieved. Some recent work in adaptive autoreclosure has introduced the strong possi bility of bringing some measure of adjusting dead times by accurately identifying are extinction times. However, although the secondary are extinction time provides a good indication of when to reclose, reclosu re of the circuit breakers immediately following are extinction will n ormally result in a restrike of the fault. This is because a further f inite time is required to allow the fault are path to deionise fully, so that the transmission line may withstand the full system voltage on reenergisation. The with identifying the concerned additional delay p eriod (after secondary are extinction), so that in conjunction with ad aptive autoreclosure techniques, the optimal reclosure time can be det ermined.