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高压电器  2014 

环氧树脂绝缘浇注件局部放电滞后特性的探讨

, PP. 133-138

Keywords: 环氧树脂绝缘件,局部放电,滞后特性,界面

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Abstract:

在大量绝缘件的电性能测试过程中,发现某些结构的绝缘件的局放量会随放置时间的延长而出现增大的现象,暂且将这种现象称为局部放电的“滞后特性”。通过三维有限元仿真分析同时结合验证性试验,确认了造成绝缘件出现局部放电“滞后特性”的根本原因在于其中的绝缘支脚与环氧树脂材料间的界面会在绝缘件的放置或后续使用过程中由于膨胀系数不同导致界面出现裂纹或是微小气隙等所致。针对查找出的问题点,通过取消绝缘支脚以消除树脂材料内异种材料的埋入而有效避免界面问题和内部应力问题,并最终达到预期的改善效果。

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