人工电压脉冲与局部放电UHF信号的等效性分析

发布时间：2018-04-21 15:43

本文选题：GIS + 局部放电　；参考：《电网技术》2014年10期

【摘要】：使用人工电压脉冲向GIS内部注入与局部放电等效的特高频(ultra-high-frequency,UHF)电磁波信号是UHF检测系统灵敏度现场校验的关键环节。通过实验研究人工电压脉冲与局部放电UHF信号的时域幅值和频谱分布差异。建立了基于220 kV的GIS设备的局部放电UHF测试平台,在靠近出线的腔体内分别用局部放电缺陷和人工电压脉冲发射UHF电磁波,利用安装在4个典型部位的圆盘形天线接收UHF信号。通过测量各部位的信号幅值,对比人工电压脉冲与局部放电UHF信号的衰减程度;通过对信号波形作傅立叶变换,对比2种信号的频谱分布。研究结果表明,经过断路器后人工电压脉冲的信号衰减程度略大于局部放电,人工电压脉冲的频谱分布接近于局部放电,且人工电压脉冲电压波形的上升时间在0.3?1 ns范围变化时对UHF电磁波信号频谱分布没有影响。对于开展UHF检测系统灵敏度现场校验工作具有重要指导意义。
[Abstract]:The injection of UHF ultra-high-frequency UHF signals equivalent to partial discharge into GIS using artificial voltage pulses is a key link in the field calibration of the sensitivity of UHF detection system. The time-domain amplitudes and spectral distributions of artificial voltage pulses and partial discharge UHF signals are studied experimentally. A partial discharge UHF test platform based on 220kV GIS equipment is established. The UHF electromagnetic waves are transmitted by partial discharge defects and artificial voltage pulses in the cavity near the output line, and the UHF signals are received by the disk antenna installed in four typical positions. The attenuation degree of artificial voltage pulse and partial discharge UHF signal is compared by measuring the signal amplitudes of each position, and the spectrum distribution of the two signals is contrasted by Fourier transform of the signal waveform. The results show that the attenuation degree of artificial voltage pulse after circuit breaker is slightly greater than that of partial discharge, and the spectrum distribution of artificial voltage pulse is close to partial discharge. When the rise time of the artificial voltage pulse voltage waveform changes in the range of 0.3 ~ 1 ns, it has no effect on the spectrum distribution of the UHF electromagnetic wave signal. It is of great significance to carry out the field calibration of the sensitivity of UHF detection system.
【作者单位】：广东电网公司;高电压与电磁兼容北京市重点实验室(华北电力大学);广东电网公司电力科学研究院;
【分类号】：TM595

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