变电所二次系统电磁兼容抗扰度指标分析

Analysis on Electromagnetic Compatibility Immunity Indexes for Secondary Systems of Substation

变电所的电磁环境威胁二次系统的安全运行,处于强电磁环境中的变电所内的二次系统进行电磁兼容抗扰度测试尤为重要。为此,根据国内外变电所电磁环境测量及分析结果,总结了变电所电磁环境参数的特征值并提出变电所二次系统电磁环境参数的推荐值,包括工频电场、稳定持续磁场、1～3s短时磁场、雷电瞬态磁场、操作瞬态电场、操作瞬态磁场、雷电干扰电压、操作干扰电压、短路干扰电压、瞬态地电位升和工频短路地电位升。分析比较目前变电所内二次系统的常规电磁兼容抗扰度的要求后,提出了变电所二次设备电磁兼容抗扰度的要求,并分析讨论了不同位置的二次设备电磁兼容抗扰度测试的主要特征参数推荐值,另外也补充了需要增加的试验项目。提出的二次系统抗扰度测试参数更为符合变电站电磁环境实际特征。

The electromagnetic environment of substation threats the safe operation of secondary systems in substation, the electromagnetic compatibility （EMC） immunity test of secondary system in substation with strong electromagnetic environment is very important. According to the experimental and analysis results of electromagnetic environment parameters in substation in literatures, this paper summarized the characteristic values of electromagnetic environment parameters in substation, and proposed the recommended values for the electromagnetic environment parameters of substation, including power frequency electrical and magnetic fields, 1-3 s short-time magnetic field, lightning transient magnetic field, switching transient electric and magnetic fields, lightning interference voltage, switching interference voltage, short-circuit interference voltage, transient and power frequency ground potential rises. By analyzing the general demand to the EMC immunity of secondary system, the requirement to the EMC immunity test of secondary system in substation is proposed. The main characteristic parameters for the EMC immunity test of secondary systems in different locations of substation are also discussed, the test items, which should be added, are also listed, these test items and requirements are more suitable to the actual electromagnetic environments of substations.