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智能变电站二次设备对开关瞬态的电磁兼容抗扰度要求分析

DOI: 10.13336/j.1003-6520.hve.2015.05.037, PP. 1687-1695

Keywords: 智能变电站,二次设备,开关瞬态,电磁兼容,抗扰度,阻尼振荡波,阻尼振荡磁场

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Abstract:

智能变电站合并单元、智能终端等二次设备位于开关场,容易受到开关操作产生的瞬态电磁骚扰影响,为保障二次系统可靠运行,需要建立符合工程实际的电磁兼容考核要求。为此通过研制瞬态电磁骚扰测量系统,对多个不同电压等级的智能变电站进行现场实测,得到开关操作引起的二次设备端口的电磁骚扰特性。试验结果表明开关操作时二次设备端口共模、差模骚扰以及空间磁场波形均为阻尼振荡波,其中隔离开关操作引起的最大共模骚扰幅值接近2kV,主频>20MHz。建议根据IEC61000-4-18标准进行阻尼振荡波抗扰度试验,试验等级≥3级;根据IEC61000-4-12标准进行阻尼振荡磁场抗扰度试验,试验等级≥5级,另增加3、10、30MHz振荡频率的阻尼振荡磁场试验。

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