智能变电站就地智能设备电磁兼容抗扰度实验分析

Experimental Analysis of EMC Immunity for Field Installed Intelligent Equipment of Intelligent Substation

随着智能变电站建设的全面推进,二次智能设备就地布置成为趋势,但就地布置后,开关场的电磁环境比保护小室更为严酷。本文在某110k V智能变电站就地合并单元发生异常情况之后,对该变电站就地合并单元进行电磁兼容相关实验并对其结构进行改进。为了定量分析该就地合并单元受到的电磁骚扰强度,测录了该110k V和某500k V智能变电站的电磁骚扰信号,分析了电磁骚扰信号的幅值和时频特性。在结合电磁兼容实验结果和骚扰信号的幅值和时频特性的基础上,分析了国内现行的电磁兼容抗扰度实验标准的适用性,指出当前国内的电磁兼容抗扰度实验标准已不足以考核就地安装的二次智能设备。最后,为提高就地布置二次智能设备的电磁兼容性能,提出了一些建议。

Along with the construction of intelligent substation, the field installation of secondary intelligent devices becomes a trend. The distance from field installation intelligent secondary devices to the disturbance source is nearer, so the intelligent devices suffer greater electromagnetic disturbance. After the abnormal phenomenon of the 110 k V intelligent substation merging unit happened, the electromagnetic compatibility experiments are carried out and the structure of the merging unit is improved. To quantitatively analyze the intensity of electromagnetic disturbance to merge units, the electromagnetic transient disturbance signal of the 110 k V substation and 500 k V substation which caused by switching operation is measured and recorded. The characteristics of amplitude and time-frequency of the recorded electromagnetic transient disturbance signal are analyzed. Based on the electromagnetic compatibility experimental results and the characteristics of disturbance signal, the applicability of current domestic electromagnetic compatibility immunity experimental standard is analyzed. It is pointed out that the current standard is not adequate to examine the field installed intelligent equipment. Finally, this paper puts forward some suggestions about improving the electromagnetic compatibility performance of merging unit.