基于母线差动保护的电子式与电磁式互感器同步应用

Synchronous Application of Electronic and Electromagnetic Transformers for Bus Differential Protection

变电站数字化建设过程中电磁式互感器仍在使用,文中介绍了数字化变电站改造过程中电磁式互感器接入方案。在母线差动保护的基础上,分析了电子式和电磁式互感器同时接入产生的误差原因,提出通过设置采样数据延时参数消除误差的方法,讨论了2种互感器的数据同步问题,提出了对收发时序控制逻辑的调整,解决了合并单元采样数据同步传输问题。结合三乡数字化变电站的改造实际案例进行了分析和说明,并提出了解决方案。

Usually,electromagnetic transformer is still in use during the digital substation construction.The electromagnetic transformer accessing solution during digital substations modernization is introduced.The causes of errors generation are analyzed when the electronic and electromagnetic transformers simultaneously access for bus differential protection.Through the delaying parameter setting of sampling data,the method to eliminate errors is put forward.Data synchronization between two kinds of transformer is discussed.Based on the adjustment of receiving and sending sequential control logic,the problem of synchronized transmission for the merging unit sampling data is solved.A solution for the practical case of Sanxiang digital substation modernization is proposed.