| Electric power enterprises are dense enterprises of equipment n technology ^ financing ,they has characteristic of producing n providh^ distribution at one time.In order to ensure continuous power supply and satisfy the need of country economy, electric power equipment reliability and security must be improved. That is the ultimate objective of power plant equipment manage.High voltage circuit-breakers are the most broadly applied high voltage electric devices in power systems. The status of breakers directly influences power system'stability and reliability.Soit is of great significance toenhance the maintaining of circuit-breakers and to convert from planning maintenance to condition based maintenance.In accordance with the current condition of maintenance in our country, 1 the necessity of exerting the condition based maintenance to H.V.Breaker is discussed. Through the analysis and study of the condition based maintenance theory,the dissertation demonstrates the theoretic foundation on which the judgement standard of the contacts wear due to the accumulated breaking current and corresponding breaking times is based. Its main functions include: supervising the electrical endurance of contacts, judging the contacts wear according to the breaking current,and putting forward appropriate suggestion of maintenance.the system carries out the statistics and analysis of breakers operation reliability.Some topics are highlighted:the sign and judgment of breaker condition and electrical, the sample and calculation precision on the condition of the large-scale change of breaking current,the judgement of breaking time and breaking type, communication and data transmission among units, and anti-interference in substation environment.The choice of the subject comes from practical requirement.The application of the system will provide basis for maintenance of H.V.circuit-breaker.There is great significance to enhance breakers'operation reliability and to save maintenance cost.
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