Reliability Prediction of a Distribution Protection Scheme Using Markov Model

Miscoordination between the protective equipment leads to the system blackouts and weaken its reliability. In a low voltage distribution system, the cooperation between fuse and circuit breakers forms the protection of distribution feeders. During a temporary fault, the fuse melts and the system suffers from unnecessary blackouts. In this paper, the replacement of fuse by a lateral circuit breaker in a low voltage distribution system is proposed. The effectiveness of the proposed scheme is evaluated by analyzing the reliability using Markov Model. The result shows that replacing the fuse with a lateral circuit breaker having auto re-closer improves the reliability of the system for transient faults.