彬长矿业口木线35 kV线路雷电过电压仿真分析

Simulation analysis of lightning overvoltage on 35 kV line of Binchang mining koumu line

35 kV口木线是保障彬长矿区安全有序生产的重要供电线路,虽全线架设有避雷线,但由于地处山区,杆塔所处地势较高且线路绝缘水平较低,雷击事故频发。由于现有的防雷措施已不能满足需求,在ATP-EMTP中搭建35 kV口木线的仿真模型,计算该线路不同雷击情况下的雷电过电压;分析在线路易击杆塔装设线路避雷器对雷电过电压的抑制效果。结果表明,加装线路避雷器可以有效提高线路耐雷水平,减小线路及两端变压器的雷电过电压,计算结果为口木线防雷改造提供了依据。

35 kV koumu line is an important power supply line to ensure the safety and orderly production of Binchang mining area.The whole line is installed with lightning protection lines,but it is located in mountainous areas,the tower is in a high terrain and the insulation level of the line is low,lightning accidents occur frequently.Since the existing lightning protection measures can no longer meet the requirements,a simulation model of 35 kV koumu line in ATP-EMTP is built and the lightning overvoltage under different lighting conditions is calculated.The suppression effect of installing line arrester on lightning overvoltage is analyzed.The results show that installing line arrester can effectively improve the lightning resistance level of the line and reduce the lightning overvoltage of the line and the transformers at both ends,thus providing a basis for the lightning protection reconstruction of koumu line.