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Establishment of Evaluation Method of Electrical Insulating Characteristics of External Interface and Discussion of Its Application to Field

外部接口电绝缘特性评价方法的建立及现场应用探讨

基本信息

批准号：
13650340
负责人：
MIZUNO Yukio
金额：
$ 2.18万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Electrical insulation characteristics of external interface between silicone rubber and air were studied, which was a typical interface of polymer insulators. Main results obtained are as follows.1. Behavior of water droplet on silicone rubber. A series of experiments were carried out under ac voltage application by using an optical system and a high-speed camera. The effect of water droplet vibration on electrical insulation capability was also investigated.(1) Water droplet became to vibrate more severely with increasing applied voltage. After it was extended in the direction of applied electric field, flashover occurred finally through the droplet.(2) Vibration frequency of an uncharged water droplet was double the frequency of the applied voltage. On the contrary, in the case of an artificially charged droplet, it was the same with that of the applied voltage.(3) The vibration had three mechanical resonance frequencies for each size of the water droplet in the range of the present study. Three modes of resonance were visually observed.(4) It was confirmed that flashover voltage was decreased as 65% as that at non-resonance when a water droplet vibrated severely at the mechanical resonance frequency.2. Measurement of leakage current flowing on silicone rubber surface under contaminated and wet conditions :(1) A measuring system was constructed and operation was confirmed. The system enabled measurement of conductive, dry-band arc and partial discharge components of leakage current separately and simultaneously.(2) Results of the accelerated salt fog tests showed that cumulative charge of leakage current was large in the order of conductive, dry-band arc and partial discharge components.(3) Specifications of salt fog test for silicone rubber sheet, which was able to be prepared more easily compared with rod-shaped silicone rubber, werer established by paying attention to the shapes of silicone rubber and electrodes.

研究了硅橡胶与空气外界面这一典型的聚合物绝缘子界面的电绝缘特性。取得的主要结果如下：1.研究成果。水滴在硅橡胶上的行为。在交流电压作用下，利用光学系统和高速摄像机进行了一系列实验。研究了水滴振动对电绝缘性能的影响。(1)随着外加电压的增加，水滴的振动变得更加剧烈。向外加电场方向延伸后，液滴最终发生闪络。(2)不带电水滴的振动频率是外加电压频率的两倍。相反，在人工充电的情况下，与施加电压的情况相同。(3)在本研究范围内，每种尺寸的水滴的振动有三个机械共振频率。从视觉上观察到了三种共振模式。(4)证实了当水滴在机械共振频率处剧烈振动时，闪络电压比非共振时降低了65%。污染和潮湿条件下硅橡胶表面泄漏电流的测量：(1)搭建了测量系统，确定了操作条件。该系统实现了泄漏电流的传导分量、干带弧分量和局部放电分量的同时测量。(2)加速盐雾试验结果表明，泄漏电流的累积电荷按导电分量、干带弧分量和局部放电分量的顺序较大。(3)通过注意硅橡胶和电极的形状，制定了比棒状硅橡胶更容易制备的硅橡胶片材盐雾试验规范。