66kV直挂交换虚拟电路投切过电压仿真研究

Simulation Research on 66 kV Vertical SVC Switching Overvoltage

66kV直挂型交换虚拟电路已经在很多变电站得到应用。针对近几年使用过程中多次发生了66kV直挂型交换虚拟电路相控电抗器树桩击穿故障,参照东鞍山220kV变电站的直挂66kV交换虚拟电路系统搭建模型,利用PSCAD仿真交换虚拟电路装置投切过程,研究分析出在某些工况下相控电抗器两端出现了较大的投切过电压,可加速相控电抗器匝间绝缘层的老化,是相控电抗器损坏的原因之一。

66 kV vertical SVC has been already put into operation in several transformer substations. In view of tree discharge or breakdown failure frequently happening in the phase-controlled reactor in the 66 kV vertical SVC, PSCAD software is used to conduct a simulation research on 66 kV vertical SVC system installed on Donganshan 220 kV transformer substation. It is concluded that SVC switching overvohage might happen at both ends of phase-controlled reactor, which might accelerate insulation aging and damage of phase-controlled reactor.