110~500 kV复合绝缘子的雷电闪络特性

为研究复合绝缘子的雷电冲击闪络特性，在110 kV、220 kV和500 kV电压等级下对复合绝缘子进行了大量的试验。利用Matlab分析试验数据，得到了不同电压等级绝缘子50%雷电冲击电压与干弧距离的关系曲线，拟合出了110~500 kV绝缘子50%雷电冲击电压与干弧距离的关系表达式，通过逐步提高冲击电压的峰值研究并绘制出了110 kV绝缘子的伏秒特性曲线，为复合绝缘子的选型提供了参考。

Lightning Impulse Flashover Characteristic of Composite Rod Insulators With Rated Voltage From 110 kV to 500kV

To research the lightning impulse flashover characteristic of composite insulators, a lot of tests for composite insulators are performed under voltage grades of 110 kV, 220 kV and 500 kV respectively. Analyzing test data by Matlab, the relation curves of 50% lightning impulse voltage to dry-arc distance for insulators with different rated voltages are obtained; the relational expressions of 50% lightning impulse voltage to dry-arc distance for insulators with rated voltage from 110 kV to 500 kV are fitted. By means of lifting the peak value of impulse voltage, the voltage-time curve of insulator with rated voltage 110 kV is researched and plotted, the obtained results are available for reference in the selection of composite insulators.