高压重复频率纳秒脉冲下电信号的测量与诊断
Measurement and diagnostics of electrical signals under high voltage repetitive nanosecond-pulses
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摘要: 为了更准确地获得重复频率纳秒脉冲下气体击穿试验参数，分析了击穿电压、放电电流的测量及影响测量结果的因素等，并介绍重复频率下气体间隙击穿的耐受时间测量方法。信号测量传感器的响应带宽、间歇性存在的电磁干扰、气体间隙被击穿时瞬态高频振荡及地电位暂态升高等因素会干扰被测信号，甚至会导致被测信号局部干扰严重。采用软阈值小波降噪法可有效减小干扰。在测得分流器方波响应的基础上，采用Wiener滤波器反卷积补偿分流器输出信号的方法来校验分流器输出，结果表明分流器输出波形满足试验要求。Abstract: In order to obtain experimental parameters of gas breakdown under repetitive nanosecond-pulses, this paper introduces measurement and influencing factors of incident voltage and discharge current, and describes repetitively stressing time which is peculiar to repetitively nanosecond-pulse breakdown. The response bandwidth of measurement component, intermittent electromagnetic interference, and transient high-frequency oscillation when insulating gas gap is brokendown can affect the measured results of electrical signals, especially lead to a short-duration disturbance on the measured signals. The wavelet soft-threshold denoising method can reduce the interference effectively. Based on the response measurement of current diverter, the deconvolution using Wiener filtering theory can compensa
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Key words:
- nanosecond-pulse signals /
- measurement /
- repetitively stressing time /
- denoising /
- calibration
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