Analysis of partial discharge signals in 420 kv gas insulated substation
Analysis of partial discharge signals in 420 kv gas insulated substation
复制标题
420kV气体绝缘变电站局部放电信号分析
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. S. Kumar
中科院分区：
文献类型：
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作者：
T. Prabakaran;S. Usa;A. S. Kumar
气体绝缘变电站（GIS）的可靠性已经被证明了四十多年，但也有一些故障的报道。一些故障是由于GIS舱内存在金属和非金属颗粒造成的。GIS在生产、维修、安装过程中产生的缺陷，以及由于部件老化而产生的缺陷。颗粒会引起场的不均匀性，从而降低击穿强度。在GIS中进行局部放电测量是评估GIS绝缘状况的成熟技术。因此，为了正确评估故障，有必要对局部放电（PD）模式有一个很好的理解。本文利用电学和超高频方法确定了不同缺陷的局部放电模式。由于绝缘失效通常是从PD活度开始的，本文采用电气和超高频方法研究了不同类型缺陷SF6气体中PD特性的差异。为了建立局部放电和施加电压对不同缺陷的相关性，进行了一系列的试验。实验结果表明，在考虑局部放电特性的基础上，可以实现对缺陷的正确识别。
Gas insulated substation (GIS) reliability has been proven for more than forty years, yet some failures has been reported. Some of the failures are due to the presence of metallic and non metallic particles inside the GIS compartment. The defect can be generated in GIS during production, maintenance, installation and due to ageing of the component. The particle can give rise to field nonuniformities, which can reduce the breakdown strength. Proven technique to assess GIS insulation condition is partial discharge measurement in GIS. Hence for proper assessment of the failure it is necessary to have a good understanding of the partial discharge (PD) patterns. This paper identifies PD patterns for different defect using electrical and UHF method. As insulation failure usually starts with PD activity, this paper investigates the differences in PD characteristics in SF6 gas with different types of defects using electrical and UHF method. A series of tests has been done to establish a correlation between partial discharge as well as the applied voltage for different defects. Experimental results show that correct identification of defects can be achieved based on considered PD characteristics.