35kV系统雷电过电压在线计算的研究

Online Calculation for Lightning Overvoltage of 35kV Power System

大型厂矿企业的动力系统普遍采用35 kV及以下的电压等级、中性点非直接接地方式,运行过程中容易出现过电压。尤其是在矿山开采地区架设的输电线路,由于雷电有可能击在裸露的架空线上,对设备以及输变电元件的绝缘造成不同程度的威胁和损害。本文采用贝杰龙法对某铜矿动力厂35 kV输电系统的雷电过电压进行在线计算,在发生雷电过电压时,对主要节点处的过电压进行判断,并给出相应的防范建议。

Many large industrial mining enterprises commonly used power system of 35 kV voltage and below grade,and non-direct grounded neutral point.During operation,over-voltage prones to occur.Especially in the mining areas where the transmission line is set up,because lightning may strike the bare overhead line,the insulation of equipment and power transmission components face different levels of threat and damage.This article uses the model of Bergeron to do an online calculation of lightning overvoltage for a 35 kV power system of a copper mine.In the event of lightning over-voltage,over-voltage judgments on the primary nodes are carried out,and the corresponding preventive recommendations are given.