架空线路弧垂和绑扎线对雷电传播影响的研究

摘要

The lightning over-voltage propagation characteristics due to the wire sag and binding wire is studied,the refraction and reflection phenomenon is analyzed through the lightning wave propagates from spectrum analysis and circuit wave impedance,ATP-EMTP software is used to simulate.The results show that if the wave front time is shorter,the energy of high frequency spectrum and its refraction coefficient is larger under the common action of wire sag and binding wire,the amplitude of refraction voltage increases with the decrease of wave front time.The lightning over-voltage amplitude increases due to the catadioptric will significantly reduce the lightning withstand level of insulated wire and will lead the breakdown of insulation wire and insulator.%对雷电过电压在导线弧垂和绑扎线影响下的传播特性进行了研究,从频谱分析和线路波阻抗的角度入手分析了雷电波在传播时的折反射现象,并利用EMTP电磁暂态仿真软件进行仿真.结果表明:波前时间越短的雷电波的高频频谱能量越高,折射系数也越大;在弧垂与绑扎线的共同作用之下,折射电压幅值增大的程度随着波前时间的减小而增大;雷电过电压因折反射致使幅值增大会显著地降低线路的耐雷水平,导致绝缘导线及绝缘子易发生击穿.