提高500 kV变电站220 kV母线短路水平问题的研究

Study of Improving the Short-Circuit Level of 220 kV Bus in 500 kV Substation

针对当前城市电网中500 kV变电站的220 kV母线短路水平超标问题,通过辨识分区内的最大短路电流点,开展将500 kV变电站的220 kV母线设备短路水平提升至63 kA后,分析其对500 kV母线、相邻220 kV变电站、110 kV和35 kV母线、分区规模、设备的影响,并利用天津电网进行实证,给针对电网短路水平整体偏高的问题的研究提供参考。

In view of the problem of exceeding the 220 kV bus level of 500 kV substation in the current urban power grid,the maximum short-circuit current point within the zone is identified.After raising the short-circuit level of 220 kV busbar equipment in 500 kV substations to 63 kA,this paper analyzes its impact on 500 kV busbars,adjacent 220 kV substations,110 kV and 35 kV busbars,partition scaleand equipment,which provides reference for the overall high short circuit level of the grid.