基于向量分析法的三相交联电缆局部放电检测与分析识别技术

Partial discharge detection and identification for three-phase cross-bonded cable based on vector analysis method

三相交联电缆的局部放电诊断易受到外界环境、相间串扰等因素的影响。为了解决信号的串扰问题,介绍了基于向量分析法的三相交联电缆局部放电检测与识别技术。该方法基于不同的局放脉冲衰减程度不同的原理,利用三相信号脉冲组的幅值关系构建三相幅值相位关系图,用来区分外部噪声和内部局放信号,同时分离不同的局放源。通过理论研究与现场实例的分析可以得出结论,该方法在高压交联电缆的局放诊断方面具有较好的可行性和优越性,可有效应用于三相交联电缆局放现场检测和绝缘诊断。

The PD diagnosis of three-phase cross-bonded cable is affected by environment and mutual crosstalk. In order to solve the problem, this paper introduces the PD detection and identification for cross-bonded cable based on vector analysis method. The principle of method is that different PD pulse has different attenuation characteristic. The three-phase amplitude relation diagram （3PARD） is established based on the amplitude relation of three-phase pulse. The diagram is used to distinguish external noise from internal PD signal and separate different PD sources. It can be concluded from the result of theoretical research and on-site test that the method has better feasibility and superiority in PD diagnosis for HV cross-bonded cable and can be effectively applied to the on-site detection and insulation diagnosis.