500kV变电站串内合环电流分析

Analysis on Closing-loop Current in 500 kV Transformer Substation

针对500kV变电站某种故障下的运行方式进行事故预想,通过PSCAD仿真平台对故障下的运行方式建模分析,研究此种运行方式下利用中开关进行串内合环对电网的冲击情况。结果表明,母线电压、幅值和出线负荷这些因素均处于不利条件时合环冲击电流较大,可能会对电力设备和电网运行产生不利影响,为运维人员面对突发情况的处理和操作提供了参考。

In this paper,the accident prediction is made for some fault operation mode of 500 kV substation,and the operation mode is modeled and analyzed by PSCAD simulation platform,and the impact of series-inner closing loop on power network by using medium switch is studied.The results show that when the bus voltage,amplitude and outgoing load are all in unfavorable conditions,the closing loop impulse current is large,which may have adverse effects on the operation of power equipment and power grid.It provides the effective suggestion for the operation personnel to deal with the emergency situation.