A Noncommunication Adaptive Single-Pole Autoreclosure Scheme Based on the ACUSUM Algorithm

In this paper, a new noncommunication-based adaptive single-pole autoreclosure (ASPAR) scheme is proposed, by which the extinction of secondary arc can be detected rapidly, in 4 ms. The proposed algorithm applies the adaptive cumulative sum method (ACUSUM) to a local bus voltage signal in order to reveal the occurrence of three successive events during a fault, that is, fault inception, circuit breaker (CB) opening (primary arc extinction), and secondary arc extinction; while detection of the last event can lead to CB reclosing. According to the fact that the two first events result in abrupt decreases in local voltage amplitude and the third one imposes an abrupt increase, this sequence of changes in voltage amplitude distinguishes temporary faults. To evaluate the robustness of the proposed scheme against transient faults, the results of investigations on different conditions, including fault location, amount of load, power-flow direction, and short-circuit levels of local and remote buses are presented; where, in all cases, the highest reliability has been achieved.