Deterioration of metal oxide surge arrester element caused by internal partial discharges under polluted conditions

[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials Pub Date : 1991-07-08 DOI:10.1109/ICPADM.1991.172111

K. Izumi, H. Honma, J. Tanaka

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引用次数: 4

Abstract

In order to clarify the influence of internal partial discharges on metal oxide surge arrester elements (ZnO varistors) caused under polluted conditions, tests simulating internal partial discharges were made. In the simulation tests, internal partial discharges occurred between the ZnO varistor side surface and the needle in both air and nitrogen atmospheres. It was found that the deterioration of the ZnO varistor occurs in an air atmosphere. Some aspects in the deterioration of ZnO varistors were elucidated from measurements of the V-I characteristics, analysis of the gas generated, observations by scanning electron microscope, and thermally stimulated current spectra. It is shown that the deterioration of a ZnO varistor under partial discharge conditions in air may be caused by both the erosion of the side surface of the ZnO varistor and the action of some generated gases. This deterioration may be accelerated under service conditions.<>

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金属氧化物避雷器元件在污染条件下因内部局部放电而劣化

为了弄清污染条件下内部局部放电对金属氧化物避雷器元件(氧化锌压敏电阻)的影响，进行了模拟内部局部放电的试验。在模拟试验中，在空气和氮气气氛中，ZnO压敏电阻侧表面与针之间都发生了内部局部放电。结果表明，ZnO压敏电阻在空气环境中发生劣化。从V-I特性测量、产生气体分析、扫描电镜观察和热激电流谱分析等方面阐述了氧化锌压敏电阻老化的一些方面。结果表明，在空气中局部放电条件下，氧化锌压敏电阻的劣化可能是由氧化锌压敏电阻侧表面的侵蚀和产生的一些气体的作用引起的。在使用条件下，这种恶化可能会加速。

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[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials

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