变电站直流系统安全隐患的排查和处理

Investigation and Treatment of Security Risks in Substation DC System

遂宁500 kV变电站投运前两段220 V直流系统母线电压一直处于波动状态,直接影响到遂宁变电站的投运,通过现场排查发现导致直流系统母线电压循环波动原因:6台直流母线绝缘监测装置轮值分时工作循环投入和退出平衡桥公共接地点造成。改进措施:退出绝缘监测装置不平衡桥和轮值分时工作模式,永久投入平衡桥和公共接地点,有效解决了直流系统电压波动问题。

The two segments of bus voltage of 220 V DC system are always in a situation of fluctuation in Suining 500 kV Substation, which directly impacts on the substation being put into operation. Through the on -site investigation, the reasons led to the cyclical fluctuations of bus voltage of DC system are found, that is, the rotating time division mode of 6 sets of DC bus insulation monitoring device has been put into use repeatedly and the common grounding point of the balance bridge has been exited. The improvement actions are proposed, that is, to exit the unbalance bridge and rotating time division mode of insulation monitoring device, and to put the balance bridge and the common grounding point into operation permanently, which can effectively solve the voltage fluctuations of the DC system.