| The operation and reliability of total power systems are mostly characterized by distribution system reliability .Research and application of distribution system reliability can effectively assure the quality of power supply ,modernize electric power industry , increase the economic benefit and society benefit ,direct the construction and reconstruction of distribution .The distribution system has a direct connection to customers ,naturally distribution system can make most influence on customers . So the evaluation of distribution system reliability and improving system reliability is most significant.Base on the comprehensive reading of references about distribution system reliability ,the paper compares several reliability evaluation methods and presents a method using Failure-Model-and-Effect Analysis (FMEA) associated with equivalent principle to assess the reliability of complicated distribution system .At the same time ,the paper chooses main feeder F4 among RBTS Bus6 and its three branch feeder F5,F6 and F7 as studying system , and verifies the effective ness of method.This paper presents a general method of reliability economic evaluation in distribution system which based on Semi-Markov process and aimed at the uncertainty of failure duration distribution .It gives a reliability assessment model for element longevity , preventive maintenance and repair time submitting to a random distribution; It introduces customer interruption damage function and gives a calculation method of interruption cost in imperfect maintenance ;Finally ,it offers a simple system to testify its correctness and validity ,reveals that it is compatible with the Homogenous Markov and Weibull Markov model , and could subtly reflect the effect of repair time on reliability cost indices . |
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