500kV多雷区核电厂变电站雷电过电压仿真计算分析

Simulation and Analysis on 500kV Nuclear Substation Lightning Over-Voltage in Thunderstorm Area

雷电作为十大自然灾害之一,严重影响着电站的安全稳定运行,尤其是对于多雷区新投运的核电厂超高压变电站,有必要进行雷电侵入下设备节点过电压水平分析和绝缘校核。采用ATP-EMTP软件建立了500 kV多雷区核电厂变电站的仿真模型,仿真计算了雷电波不同侵入方式、不同雷击点和变电站不同运行方式下站内关键设备上产生的雷电过电压,并进行了雷电冲击绝缘校核。结果表明:近区雷击时,雷击2号杆塔为最严重状态;在单变压器单母线单出线方式或单变压器单出线方式运行时,运行方式对变电站各设备过电压影响较小;在现有防护下,各关键设备能够耐受50年一遇的雷电冲击,并具有充足的保护裕度。

As one of the ten natural disasters,lightning seriously affects the safety and stability of nuclear power stations.For the new substation,it is necessary to check the insulation in lightning.The simulation model of the nuclear substation is established by using ATP-EMTP.And the lightning over-voltage under different lightning intrusion,different lightning point and different operation mode is calculated.In addition,insulation check is made under lightning.The simulation result shows that:the lightning strikes 2 No.tower is most serious in near lightning strokes;there is little influence made by operation mode under single transformer single bus single output mode;and the equipment can withstand the required lightning and have sufficient protection margin under the existing protection.