Statistical Analysis and Discharge Type Identification of Partial Discharge Pulse Parameters of Oil-Paper Insulation Based on Ultra-wideband

Xinbo Lu, Kaining Hou, Qingquan Li, W. Si, C. Fu
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引用次数: 1

Abstract

The effective measurement frequency band of the traditional pulse current method is up to 1MHz, which causes the loss of the main energy frequency band information of the partial discharge pulse signal. In view of this, an ultra-wideband partial discharge pulse measurement system with an effective measurement frequency band of 30kHz-50MHz is designed. The system is used to measure the discharge signals of three types of oil-paper insulation defect models built under laboratory conditions, in order to obtain statistical characteristics that can characterize different types of partial discharge pulse parameters of oil-paper insulation. The results show that: the ultra-wideband partial discharge pulse measurement system can restore the original characteristics of the partial discharge waveform to a greater extent, which is conducive to the accurate analysis of the characteristics of the partial discharge pulse; the measured parameters of different types of partial discharge pulses have different statistical characteristics. Using discharge pulse rise time, fall time, 50% pulse width and 10% pulse width as input characteristic parameters to identify partial discharge types can achieve better results.
基于超宽带的油纸绝缘局部放电脉冲参数统计分析及放电类型识别
传统脉冲电流法的有效测量频带高达1MHz,导致局部放电脉冲信号的主要能量频带信息丢失。鉴于此,设计了一种有效测量频段为30kHz-50MHz的超宽带局部放电脉冲测量系统。利用该系统对实验室条件下建立的三种油纸绝缘缺陷模型的放电信号进行测量,以获得能够表征不同类型油纸绝缘局部放电脉冲参数的统计特征。结果表明:超宽带局部放电脉冲测量系统能在较大程度上还原局部放电波形的原始特征,有利于对局部放电脉冲特性的准确分析;不同类型局部放电脉冲的测量参数具有不同的统计特性。采用放电脉冲上升时间、下降时间、50%脉宽和10%脉宽作为输入特征参数来识别局部放电类型,可以取得较好的效果。
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