220/110kV电磁环网闭环运行对短路电流的影响分析

Impact Analysis of Closed-loop Operation of 220 kV Electro-Magnetically Coupled with 110 kV on Short-circuit Current

目前国内绝大部分220/110 k V电磁环网采取开环运行的方式。电磁环网闭环运行时涉及的各个电压等级的短路电流可能出现超标是导致220/110 k V电磁环网"一刀切"式的解环运行的重要因素。以湖南电网220/110 k V电磁环网为例,分析220/110 k V电磁环网开、闭环运行对短路电流的影响,并探讨极端状态下短路电流的变化情况。以此为基础,归纳出220/110 k V电磁环网闭环运行时短路电流变化的典型结论,该研究成果为合理确定220/110 k V电网电磁环网的闭环运行可行性提供重要依据。

Most of the 220 k V electro-magnetically coupled with 110 k V adopt open-loop operation mode domestically for the moment. An important factor to adopt this operation mode is that the short-circuit current related to the electromagnetically coupled power loop is likely to exceed the standard. The 220 k V electro-magnetically coupled with 110 k V in Hunan Province are taken as an example to analyze the effect of the different power supply mode to the short-circuit current,and the changes of short-circuit current in extreme conditions are also investigated. On this basis,several typical conclusions of the changes of short-circuit current when 220 k V electro-magnetically coupled with 110 k V adopt closed-loop operation are derived. The research results of this paper provide theoretical basis for reasonably determining the feasibility of 220 k V electro-magnetically coupled with 110 k V adopt closed-loop operation.