单回配电线路每隔2杆安装避雷器直击雷保护特性研究

Research on Direct Lightning Protection Characteristics of Lightning Arrester Installed Every Two Poles in Single Circuit Distribution Lines

研究配电线路每隔2杆安装避雷器配置工况下的直击雷保护特性,发现距离避雷器安装杆最远的雷击点耐雷水平最低为2.6 kA,越是远离避雷器安装杆,线路耐雷水平越低,相较于常规线路耐雷水平1.7 kA有所提高,但提高效果极小。随着雷电流幅度的增大,闪络杆的范围逐渐扩大,同时存在隔杆闪络的现象;两相邻非避雷器安装杆出线处过电压波形变化相似,有一定的传播时间差,幅值在两边避雷器安装杆控制的电位幅值间震荡。

The direct lightning protection characteristics of distribution lines with lightning arresters installed every two poles are studied.It is found that the lightning withstand level of lightning point farthest from the lightning arrester installation pole is 2.6 kA.The farther away from the lightning arrester installation pole,the lower the lightning withstand level of the line.Compared with the conventional line,the lightning withstand level of 1.7 kA is improved,but the effect is very small.With the increase of lightning current amplitude,the range of flashover pole is gradually expanded,and the phenomenon of flashover of spacer rod exists at the same time.The results show that the over-voltage waveform of the two adjacent non arrester installation poles is similar,and there is a certain propagation time difference,and the amplitude oscillates between the potential amplitudes controlled by the arrester mounting poles on both sides.