雷电流入侵时串补保护工作情况研究

Probe into the Operation of Series Compensator Protection under Lighting Attack

串联补偿装置一般装设在500 kV变电站的进线侧,超高压输电线路容易遭受雷击,雷电流沿输电线路传播,对电气设备造成过电压损害。在EMTP电磁仿真程序中搭建输电线路及杆塔模型、串补装置模型、500 kV变电站模型,模拟雷电流经输电线路进入变电站,研究雷电流在串补装置上产生的过电压情况,并根据仿真波形分析串补保护装置的工作情况。得出串补装置的误动作原因在于装置本身的定值错误,或保护判据的逻辑错误,对实际运行的电力系统串补保护装置工作情况分析具有一定的借鉴意义。

The installation of series compensator is always at the entrance of transmission line and EHV lines are easily attacked by lighting. The lighting current spreads along transmission line which can cause great damage on electrical equipment. The article uses EMTP program to make models of the transmission line, towers, series compensator and 500 kV substation, simulating the level of overvoltage on the series compensator when lighting current spreads along the line. The article analyzes the operation of series compensator protection and gives the result that the reason of wrong action of series compensator protection is the wrong parameter of itself and the wrong logie of the protection. The process and result of simulation have some value to the analysis of actions of the series compensator protection in actual power system.