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학술저널
저자정보
저널정보
한국전기전자재료학회 전기전자재료학회논문지 전기전자재료학회논문지 제16권 제9호
발행연도
2003.1
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The suspension insulators are subjected to harsh environments in service for a long time. The long-term reliability of the insulators is required for both mechanical and electrical performances. This study described some basic performance tests and accelerated ageing test by cool-heat cycling methods and thermal mechanical performance test methods on alumina porcelain insulators (new and aged) used for transmission line in KOREA. There was no fail in electrical and mechanical performance tests such as a high voltage strength, a flashover voltage, an impact strength, et al. in all samples. But in the case of accelerating ageing tests which have above 90℃ temperature gradient, fracture phenomena was happened by a thermal shock in the aged sample(sample A) with low alumina porcelain body. It was indicated that sample A was more severely aged than other samples. According to results of HRB test and microstructural analysis, it was reasoned that insulator bodies with the matrix reinforced with alumina crystalline phase have advantages over the suppression of crack advance. And cool-heat aging and mechanical thermal ageing tests shows that a temperature gradient is more effective to accelerating than a cycling number.

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