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金属化膜电容器自愈理论及规律研究

, PP. 218-223

Keywords: 金属化膜电容器,自愈能量,自愈概率,自愈持续时间,自愈面积,寿命

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Abstract:

主要研究金属化膜电容器的自愈特性及影响自愈过程的关键因素。研究表明,降低自愈放电过程中的自愈能量,是提高金属化膜电容器工作寿命和可靠性的有效途径。通过分析金属化膜自愈的物理过程,采用电测量法对影响自愈过程的各种参数及其相关性规律进行研究。对方阻R>30Ω/□的金属化膜,在场强200V/μm时开始出现击穿并发生自愈,在600V/μm附近时击穿概率达到80%,电容器在高场强下工作可靠性降低。自愈面积与自愈持续时间随着自愈能量的增加而增加,自愈能量与电压的二次方成正比、与方阻的二次方成反比,采用高方阻金属化膜可有效降低电容量损失,提高电容器寿命。层间压强增大,自愈能量减小,自愈面积和自愈持续时间减小,在这种情况下,电弧易熄灭,降低了电容量损失,提高了电容器工作可靠性。

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