| Summary: | 博士 === 國立臺灣科技大學 === 電機工程系 === 102 === The circuit breaker (CB) is one of the most important equipment in power systems. CB serves as both control and protection equipment and its operating condition is critical to the stability and reliability of power systems. CB must operate reliably to protect power systems as well as to perform tasks such as normal interruption, load disconnection and fault clearing. Circuit breaker maintenance management has become an important topic nowadays as the number of CBs increase with economic growth.
Integrating intelligent electronic devices (IEDs) with intelligent approach to assess reliability-centered maintenance (RCM) of CB is proposed in this paper. A CB condition monitoring system using IEDs has been established in this work. IEDs from different manufacturers in a power substation are linked to the CB condition monitoring system which is built in a remote mainframe through an interconnected network to collect information such as the CB maintenance parameters. Fuzzy set theory (FST), analytical hierarchy process (AHP) and evidential reasoning (ER) are applied to assess the conditions of existing substation CBs by processing their preventive test data, IED monitoring data, operation data and maintenance data. In addition, major influence factors of the substation CBs are collected and processed using an expert investigation method to calculate the weights of the importance factors and to perform importance assessment of CBs. Finally, RCM decisions are made based on the results of CB condition assessment and importance assessment. The data and analysis results may provide valuable information for the maintenance personnel and the management department personnel to schedule CB maintenance planes.
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