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气体绝缘变电站母线结构参数对外壳暂态过电压影响分析

, PP. 239-246

Keywords: 外壳暂态过电压,分离元法,传输线理论,幅频特性

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Abstract:

母线结构参数和等效模型的确定是分析气体绝缘变电站（GIS）母线系统外壳暂态电压（TEV）的基础。应用分离元法（PSEC）确定分箱式母线系统阻抗参数,根据传输线理论得到单相GIS母线系统集中参数简化计算模型。同时,采用数学解析方法分析了GIS外壳暂态过电压影响因素。并对不同母线结构下TEV进行仿真,得到其电压波形及幅频特性曲线,验证了简化模型的可行性。在此基础上,讨论电弧电阻、断路器断口电容、末节母线长度、接地线波阻抗及数量等结构参数对TEV峰值的影响。仿真结果表明,TEV是由多个频率分量组成的电压波,其峰值与母线末端电压基本成比例关系,电弧电阻可以延迟TEV出现的时间,降低断路器断口电容与接地线波阻抗,增加末节母线长度和接地线数量能降低TEV峰值。

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