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不同场强下金属化聚丙烯膜电容器泄漏特性

, PP. 274-280

Keywords: 电容器,金属化聚丙烯膜,泄漏,绝缘电阻,Poole-Frenkel效应

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Abstract:

金属化聚丙烯膜电容器(MPPFC)是脉冲功率电源系统中的常用储能单元,应用于高场强的MPPFC电压降落现象显著。介质泄漏是降低储能效率的重要因素,绝缘电阻提供了泄漏的路径。本文以MPPFC为对象,通过测量其的绝缘电阻来研究的泄漏特性。测试结果表明MPPFC的等效绝缘电阻对场强极其敏感,随着场强增加,等效绝缘电阻急剧减小。结晶度显著影响薄膜的等效绝缘电阻。结合Poole-Frenkel效应的等效绝缘电阻计算结果表明,影响等效绝缘电阻的关键参数是电场强度、电导率和Poole-Frenkel效应系数,本文等效绝缘电阻计算值与测试结果吻合。

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