A Configuration Schema of Centralized Reclosing and Its Reliability Analysis

Automatic reclosing has been widely used in power systems because it can shorten power outage time and reduce the frequency of line outage, and thereby improving power supply reliability and operation stability in the case of transient fault. However, the existing automatic reclosing schemes are distributed according to the circuit breaker layout. And the experience in operation field shows that the scheme has some problems such as complex wiring, reclosing cooperation difficulties of multiple circuit breakers, and low correct operation rate. Therefore, a centralized reclosing configuration scheme based on multi-bays information of substation is proposed in this paper, which can realize the automatic reclosing function of multi-bays in a reclosing device. This configuration scheme has the advantages of simplified field wiring and being easy to realize the cooperation of multi-bays reclosing. Based on the fault tree analysis (FTA), the reliability model including sampling link, reclosing function module, closing link, and communication network of centralized reclosing has been built in this paper. Finally, those reliability models are analyzed by the sequential Monte Carlo algorithm and then the reliability indicators such as mean time between failures (MTBF) and component probability importance (CPI) can be obtained. The simulation results of reliability indicators show that the dual configuration schema of centralized reclosing is feasible and it has higher reliability compared with the traditional distributed configuration and single centralized configuration.