摘要
基于一次人工触发闪电,对架空配电线路上氧化锌避雷器(surge protective device,SPD)的接地线电流特征进行了分析。在分析时发现,近距离闪电发生时,架空线路耦合产生过电压引起的SPD接地线电流峰值达到-961.0 A,平均10%~90%上升时间为17.5μs,平均半峰值时间为68.1μs,与实验室标准测试波形有较大的差异。另外,仅由于雷电电磁脉冲产生感应过电压的冲击,SPD是不容易被损坏的。经相关性分析发现,回击引起SPD接地线电流参数与触发闪电10%~90%上升时间对应陡度有密切的关系,SPD接地线电流峰值、半峰值时间、中和电量以及单位电阻能量都与其有较好的线性相关,拟合优度R2分别为0.83、0.83、0.90及0.94。
The waveform characteristics of grounding current of SPD for overhead distribution lines is investigated based on an artificial-triggered lightning. It is found that when lightning occurs at close range, the SPD grounding wire current resulted from overhead coupling over voltage reaches peak value of 961.0 A, average rise time of 10% to 90% of 17.5 p^s, and average half peak width of 68.1 p.s. The testing results are much different from standard laboratory test. In addition, SPD is not easily damaged by induced electromagnetic pulse due to lightning over-voltage shock. Correlation analysis finds that parameters of SPD grounding wire current are closely related to the steepness of 10% to 90% rise time of artificial-triggered lightning current. SPD grounding line current peak, half peak width, amount of charge neutralized, as well as energy of per unit resistance have good linear correlation with the steepness of 10% to 90% rise time of artificial-triggered lightning current. The linear correlation coefficients are 0.83, 0.83, 0.90 and 0.94.
出处
《中国电力》
CSCD
北大核心
2016年第5期49-52,140,共5页
Electric Power
基金
广东省气象局面上资助项目(2014B12)
国家重点基础研究发展计划(973计划)资助项目(2014CB441405)~~
关键词
SPD
人工触发闪电
回击电流
配电线路
接地线电流
SPD
artificial-triggered lightning
return stroke current
distribution line
grounding line current
