Abstract

Silicon rubber composite insulator is favoured by power system because of its excellent anti-pollution flashover performance. Among them, the core rod is an important structural component to bear the mechanical load of composite insulator. In recent years, there have been many brittle fracture faults of composite insulators in China, which directly affect the reliability of transmission lines. The composite insulator is usually accompanied by abnormal heating during the aging process. As an effective live detection method, infrared temperature measurement can find the defects of composite insulator in time and reduce the occurrence of string breaking accidents. In this paper, the infrared general measurement results of composite insulators in operation of 220kV transmission line are analysed to verify the effectiveness of infrared detection and accumulate field experience. The results show that infrared general measurement can effectively detect abnormal heating composite insulators, and its detection results can correctly reflect the operation state of composite insulators, timely find the internal defects of composite insulators, and effectively improve the operation and maintenance efficiency. With the increase of service life, the number of abnormal heating of insula-tors gradually increases, showing a good linear relationship.

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