420 kV并联电抗器开断过电压仿真分析

摘要

This paper analyzes the 420 kV shunt reactor breaking over-voltage.Three common protectors for limiting cut-off over-voltage are introduced.The ideal arc model introduced in the experiment,combined with Emtp simulation result,indicates that the shunt reactor breaking over-voltage is suppressed to a great extent when the parallel resistor and the arrester are added to the system,so that the breaking over-voltage can be limited to a value below the rated voltage of the line.The analysis result presents a valuable reference for stable operation of the extra-high voltage transmission line.%对420 kV电网开断并联电抗器产生的过电压情况进行分析，对三种常用限制截流过电压的保护装置进行介绍。实验引入理想的电弧模型，结合Emtp仿真结果，表明系统通过加入并联电阻和避雷器保护方式后，并联电抗器开断过电压得到明显抑制，可以将开断过电压限制在线路额定电压1倍以内。分析结果为超高压输电线路的稳定运行提供有价值的指导参考。