配电线路感应雷过电压计算  

Calculation of the Lightning Induced Voltages on Power Distribution Line

作　　者：李琳[1] 齐秀君[1] 

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206

出　　处：《高电压技术》2011年第5期1093-1099,共7页High Voltage Engineering

基　　金：河北省自然科学基金(E2005000561)~~

摘　　要：为了提高配电线路的安全可靠性并对线路防雷设计提供有价值的参考依据,基于调整的传输线模型,计算了雷电回击电流产生的空间电磁场,借助Cooray-Rubinstein公式计算了在考虑大地土壤损耗的前提下的水平电场分量。用Agrawal场线耦合模型和时域有限差分(FDTD)法对10 kV配电线路由于附近雷击引起的线上感应电压进行了计算,其中在传输线阻抗计算中考虑了大地电导率。通过与文献计算结果对比,验证了计算方法的有效性。针对一条实际架空配电线路,分别计算了三角形布线和列式布线两种线路结构的感应雷过电压,分析了地面损耗以及其他导线的存在对线路感应雷过电压幅值和波形的影响。结果表明该理论与计算方法可以用于实际的配电线路防雷设计。In order to improve the safety and reliability of distribution lines and to provide valuable reference for lightning protection design,the electromagnetic field generated by the lightning return stroke was calculated based on the adjusted transmission line model.The horizontal electric field was calculated by using the Cooray-Rubinstein formula and in consideration of earth soil loss.Meanwhile,the coupling model proposed by Agrawal and finite-difference time-domain（FDTD） method were used to calculate the Lightning induced voltages on 10 kV three-phases overhead power distribution lines due to the nearby lightning,which considered the ground conductivity in computation of the impedance of transmission line.The numerical method was verified by comparing with a reference.For an actual 10 kV distribution line,the lightning induced voltages on two kinds of line structure which were triangular wiring and aligned wiring were calculated,respectively,and the influences of ground loss and existence of other wires on the peak value and waveform of the induced voltage at line termination were analyzed.The result shows that the theory and calculation method can be used in lightning protection designs.

关 键 词：多导体传输线 回击 感应雷过电压 Agrawal耦合模型 土壤阻抗 时域有限差分(FDTD)法 

分 类 号：TM862[电气工程—高电压与绝缘技术]