750 kV敞开式变电站和输电线路避雷器配置的优化研究

在电力系统中,避雷器的配置直接影响系统过电压和绝缘配合,对电力系统的安全稳定运行起着至关重要的作用。研究了750 kV变电站的避雷器配置对输电线路工频、操作过电压以及变电站设备节点上雷电侵入波过电压的影响,并校验了这些过电压情况下避雷器的动作负荷。根据计算结果,得出:将变电站避雷器统一配置为Y20W-600/1380型避雷器,设备的绝缘裕度和系统过电压满足要求,并均衡了避雷器的动作负荷;将变电站避雷器统一为Y20W-600/1421,仍然满足设备的绝缘裕度和系统过电压要求;通过调整设备间距和设备位置,可考虑将出线高压电抗器旁避雷器简化掉。

Reaserch on Optimization of Arrester Arrangement for 750 kV AIS Substation and Transmission Line

Overvoltage and insulation coordination in the power system are directly influenced by arrester arrangement,which is very important to the safe and stable operation of power system.Effect of arrester arrangement on power frequency overvoltage,switching overvoltage and lightning invading overvoltage at the equipment node in substation as well as the operating duty of MOA were studied.The calculation results showed that the need of insulation margin of equipments in substation and overvoltage in power system can be met if install all the MOA in the substation of Y20W-600/1380 MOA,besides,operating duty of MOA were more equilibratory;and it could also be met by placing all the MOA of Y20W-600/1421 type in the substation;the MOA beside the high voltage reactor could be omitted through adjusting the distance or position of equipments.