Abstract
In electric power system, relay protection system can powerfully safeguard secure and stable operation of the first circuit equipment; it’s an important task to ensure reliable operation of protection system. Research on reliability of it now arises much attention at home and abroad. The paper carries out detailed research survey on reliability of relay protection system, which contains AC input circuit, digital relay protection equipment and operation output circuit. In general it also contains automatic equipment and telecommunication network etc. It belongs to repairable system; state-space method and fault-tree method are main analysis methods. Each protection has its own principle and structure, the modeling of which is different. The paper discusses the reliability modeling and index system of protection system from three aspects, whose failure models are hardware and software construction, main protection and backup protection construction and construction with relation to operation mode of power system. With the vigorous development of DG in smart grid, the prospects of reliability evaluation of wide area adaptive protection system are presented.
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