某110kV智能变电站合并单元异常情况分析及对策

Analysis and Countermeasure on Abnormal Operation of One 110kV Intelligent Substation Merging Unit

变电站二次回路处在一个强电磁环境中,而智能设备会受到电磁骚扰信号的影响,同时随着智能设备就地安装,其工作环境中的电磁骚扰进一步加剧。近年来已有多起因变电站二次回路受到开关及刀开关操作引起的干扰而导致智能设备运行异常的事故发生,因此研究变电站内的二次回路的电磁兼容问题具有重要意义。某110kV智能变电站合并单元在倒闸操作时运行异常,首先通过排查法分析了合并单元运行异常的原因,然后对合并单元进行IEC61000—4标准规定的以及高于该标准的电磁兼容相关实验,在实验结果基础上,对合并单元的结构进行了改进,再次测录分析了刀开关操作产生的电磁暂态骚扰信号,总结了暂态骚扰信号的幅值以及时频联合特性,最后对提高就地合并单元的电磁兼容性能提出了一些建议。

The secondary circuit of substation is located in harsh EMI（electromagnetic inter- ference） environment, and the intelligent device may be affected by the electromagnetic disturbance signal. At the same time, as the field installation of intelligent device, the electromagnetic disturbance becomes furthermore intensified. Recently, because the transformer substation＇s secondary circuit is affected by the interference of switch operations, many intelligent devices run abnormally. It is very important and meaningful to study the EMC（electro magnetic compatibility） problem of the trans- former substation＇s secondary circuit. One 110kV intelligent substation merging unit runs abnormally. Firstly, the reason of abnormal operation of merging unit is analyzed by exclusive method. Secondly, the EMC experiments regulated by the IEC61000-4 standard and above the standard are carried out, and at the basis of the experiments, the structure of merging unit is improved. Thirdly, the electromagnetic disturbance signal is recorded; the characteristics of amplitude and time-frequency of the recorded signal are analyzed. Finally, some suggestions about improving the EMC performance of merging unit are put forward.