微机变压器差动保护误动原因分析及相应措施

The analysis of differential protection misoperation of microprocessor transformer and relevant measures

差动保护是变压器的主保护,它的稳定运行和正确动作直接影响电力系统的稳定.通过对微机变压器差动保护误动原因的分析,指出了变压器及电流互感器的暂态饱和是差动保护误动的根本原因,提出了相应的防止微机变压器差动保护误动的措施.同时对各种措施在变压器差动保护中的应用进行了比较,所得到的结论对提高电力系统供电的可靠性能起到一定的积极作用.

Differential protection is the main protection of transformer and its stable and proper operation directly influence the Stability of electric power system. In accordance with the analysis of the reasons of differential protection misoperation, this article explains that the temporary saturation of voltage transformer and current transformer is the main reason of present differential protection, and then it puts forward the relevant measures to avoid main transformer misoperation, meanwhile it also discusses the application of different kinds of measures, which plays an active role in improving the reliability of power supply of electric power system.