光伏电站间歇性弧光接地过电压分析及防治措施

Analysis and Prevention of Intermittent Arc Grounding Overvoltage in Photovoltaic Power Station

某大型并网光伏电站汇集线路采用35 kV线路,中性点采用小电流接地方式,线路中大量使用电力电缆,其电容电流较大,易发生间歇性弧光接地过电压,造成设备绝缘损坏。文章通过理论计算和实际分析,采取有针对性的改进措施,抑制间歇性电弧的形成,减少过电压引起的设备故障。

One large-scale grid-connected photovoltaic power plant adopted 35 kV line as its collection line,while the neutral point applied small current grounding method,and a large number of power cables are used in the route,which lead to relatively large capacitance current. And photovoltaic power station is prone to occur intermittent arc grounding overvoltage,resulting in equipment damage. This essay describes the theoretical calculation and practical analysis,and raise targeted improvement measures to suppress the formation of intermittent arc and to reduce the equipment damage caused by overvoltage.