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电网技术  2015 

10kV开关柜开断对二次智能设备的电磁干扰

DOI: 10.13335/j.1000-3673.pst.2015.01.017, PP. 110-117

Keywords: 开关柜,电磁干扰,合成试验,小波分析,特征能量,频带分布

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Abstract:

随着开关柜电压等级的提高,高压部分与低压智能化设备的电磁兼容问题日益突出,断路器开断被认为是中压开关柜中最严重的电磁干扰来源,它可能会造成二次控制设备出现故障,研究开关柜开断对二次智能设备的电磁干扰问题具有重要意义。利用振荡型合成试验回路对10kV开关柜进行合成开断试验,同时采集了电流互感器输出电流信号,智能操控装置和间隔智能单元输入电流信号。对采集的波形数据进行时频特性分析,得到干扰信号的频带及能量分布情况。结果表明开关柜开断对电流互感器二次侧、智能操控装置以及间隔智能单元均产生了瞬态电磁干扰,开断燃弧过程的干扰频带主要分布在31.25~62.5MHz;电弧过零阶段频带主要分布在15.625~31.25MHz;干扰幅值最大达到正常情况下的4倍。

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