On-line monitoring and troubleshooting of high voltage circuit breaker Zhao Jingqian Adiviser:Liu Dong Shanghai Jiao Tong University,Shanghai 200240,China) Abstract:Aiming at the requirement of on-line monitoring of high-voltage circuit breakers,the processing methods of signal acquisition,signal processing and fault classification are discussed.Combined with the development trend of substation automation,the on-line monitoring system model based on IEC850 is also involved in this article,which makes the project more practical. Key word;high voltage circuit breaker,On-line monitoring;fault classification;substation automation.On-line monitoring and troubleshooting of high voltage circuit breaker Zhao Jingqian Adiviser:Liu Dong （ Shanghai Jiao Tong University，Shanghai 200240，China） Abstract：Aiming at the requirement of on - line monitoring of high - voltage circuit breakers, the processing methods of signal acquisition, signal processing and fault classification are discussed. Combined with the development trend of substation automation, the on - line monitoring system model based on IEC850 is also involved in this article, which makes the project more practical. Key word：high voltage circuit breaker; On-line monitoring; fault classification; substation automation