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基于阻容网络的高压避雷器干扰电流分析

, PP. 101-106

Keywords: 金属氧化物避雷器,阻性电流,有限元法,相间干扰,阻容网络

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Abstract:

针对高压金属氧化物避雷器全电流测量存在的相间干扰问题,提出了避雷器的阻容网络模型,实现了避雷器阻性电流的准确计算。对高压避雷器进行精细化的三维建模,应用有限元法计算不考虑相间干扰和考虑相间干扰时避雷器各部分间的自电容和互电容、电阻片本体的电容。在EMTP-ATP中建立相应的避雷器阻容网络电路仿真模型,通过仿真计算得到避雷器的全电流、阻性电流和相角差。对某500kV变电站中500kV避雷器的全电流、相角差进行了仿真计算和测量,证实了该方法的正确性和有效性。利用阻容网络的方法可以有效滤除避雷器的相间干扰。与其他一些测量方法相比,该方法简单、通用,为在线监测金属氧化物避雷器和减小相间干扰提供了方便可靠的方法。

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