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高压电器  2015 

极不均匀场中正直流电晕放电紫外特性的研究

, PP. 8-17

Keywords: 紫外特性,光子计数,极不均匀电场,电晕放电,电晕电流

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Abstract:

高压输电线路缺陷故障早期往往伴随着电晕放电,应用紫外成像仪检测线路缺陷中的电晕放电现象越来越广泛,为了对放电强弱进行评估,需对紫外光子计数进行定量分析。笔者通过棒―板电极中正直流电晕放电进行了电晕电流单位时间脉冲个数、电晕电流及紫外光子计数的测量。实验结果表明,正直流电晕放电存在3个阶段,在距离放电点相同距离、相同增益时第1个阶段中电晕电流单位时间脉冲个数与试验电压近似呈线性关系,紫外光子计数与试验电压及电晕电流单位时间脉冲个数均近似呈二次关系;第2个阶段衰减较快,没有统一规律;第3个阶段中紫外光子计数与试验电压呈指数关系(N=a×ebx),其中a的取值随着棒―板距离的增加而减小,与电极结构及电晕起始电压有关,b的取值在两种电极结构中均在0.2~0.3之间。

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