溪洛渡电站550kV GIS铁磁谐振抗谐措施仿真分析

摘要

以溪洛渡电厂550kVGIS(气体绝缘金属封闭开关设备)PT(电压互感器)谐振事件为例,采用Simplorer Simulation仿真软件建立仿真模型,对溪洛渡550kV GIS更换串内PT并且加装抗谐振线圈,接入阻尼电阻,产生大的功率损耗足够消除谐振中的能量,通过抗谐装置前后的运行工况进行仿真计算表明,可以消除电压互感器中的铁磁谐振;再加以合理运行方式,在操作断路器前后,尽量缩短断路器两侧隔离开关处于合闸状态的时间,效果更好.%The ferroresonance phenomenon observed in the potential transformer (PT) in the 550 kV gas insulated switchgear (GIS) in Xiluodu Hydropower Station is analyzed with the Simplorer Simulation software.Ferroresonance suppressing measures are proposed, including the replacement of the PT, installation of the anti-resonance coil, and connection of the damping resistor, which will generate sufficient power losses to eliminate the resonance energy.Simulation results show that the ferroresonance in the PT is eliminated effectively with these measures.In addition, it is suggested that the closing state of the isolation switches on both sides of the circuit breaker should be as short as possible before and after the operation of the circuit breaker.