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The development of the way of measuring the leakage current to evaluate the deterioration of the insulation material in the snowy cold region

雪寒地区漏电流测量评估绝缘材料劣化程度的方法研究

基本信息

批准号：
13650324
负责人：
HASEGAWA Seiichi
金额：
$ 1.15万
依托单位：
AKITA NATIONAL COLLEGE 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

This research was done for the purpose of evaluating the deterioration of the polymeric insulation material used under snowy cold condition by the measurement of leakage current. Leakage current magnitude in wet and contaminated condition is one of significant indicators to assess electrical performances of outdoor insulators during operation.. However, because conductive current and discharge current flow alternately and intermittently on the surface of the polymeric insulator, therefore these magnitudes change seriously. So it is difficult to evaluate the deterioration of the insulator only by that level. It seems that apart from the leakage current magnitudes, the shape of the waveform, namely high frequency components, also can provide useful information the state of the polymeric insulator surface. In this research we employ IEC587 test for measuring leakage current. Tests have been carried out under -20〜+25℃ in a laboratory chamber.Early stage of this test, polymer surfaces resist being wetted and allow extremely low leakage current. At this time minute glow discharges are scattered on the surface of the material. With the test duration, the polymer surfaces gradually transfer to wet and allow leakage current to develop. As for this discharge, polymeric insulation material does final tracking deterioration. Leakage current has high frequency components at this time. This harmonic component shows that failure of the polymeric insulation material will happen soon.When silicon rubber suffers the damage of the discharge, the type of the failure is not tracking breakdown, and becomes erosion. Not only erosion makes it lose the insulation function of the silicon rubber but also its structure is destroyed. When leakage current is interrupted once, erosion will appear on the silicon rubber.

本研究的目的是通过泄漏电流的测量来评估冰雪条件下使用的聚合物绝缘材料的劣化程度。潮湿污秽条件下的泄漏电流大小是评估户外绝缘子运行过程中电气性能的重要指标之一。然而，由于导电电流和放电电流在聚合物绝缘子表面交替和间歇流动，因此这些大小变化很大。因此，仅以该水平来评价绝缘子的劣化程度是困难的。看来，除了泄漏电流的大小，波形的形状，即高频分量，也可以提供关于聚合物绝缘子表面状态的有用信息。在本研究中，我们使用IEC587测试来测量泄漏电流。在实验室室内进行了-20~+25℃的测试。在测试的早期阶段，聚合物表面耐湿，允许极低的泄漏电流。此时，微小的辉光放电散布在材料的表面。随着测试时间的延长，聚合物表面逐渐变为湿的，并允许产生泄漏电流。对于这种放电，聚合物绝缘材料做了最后的跟踪劣化。此时泄漏电流具有高频分量。这种谐波分量表明聚合物绝缘材料很快就会发生破坏，当硅橡胶受到放电的破坏时，破坏的类型不是跟踪型击穿，而是侵蚀。腐蚀不仅使其失去硅橡胶的绝缘功能，而且其结构也被破坏。当漏电流被切断一次时，硅橡胶就会发生腐蚀。