高压交联聚乙烯电缆局部放电脉冲的时频特性识别方法  

Time-frequency Characteristic Based Partial Discharge Pulses Identification Technique for the High Voltage XLPE Power Cables

作　　者：张周胜[1] 马爱清[1] 盛戈皞[2] 

机构地区：[1]上海电力学院电力与自动化工程学院,上海200090 [2]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《高电压技术》2011年第8期1997-2003,共7页High Voltage Engineering

基　　金：上海市教育委员会重点学科建设项目(J51303);上海市科委科技攻关项目(10dz1203000)~~

摘　　要：高压电力电缆局部放电(PD)测量中,进行绝缘诊断和状态评估的一个重要方面是局部放电信号(PDs)的识别和放电源分离。传统的基于局部放电幅值大小检测的相位统计分析,不足以实现有效的诊断、风险评估和基于状态的维护。为此,从理论上研究了频率(即等效带宽feq)-时间(即等效时间长度teq)分离技术,通过feq-teq平面的簇脉冲来识别局部放电脉冲,并求解出局部放电脉冲信号在feq-teq平面形成紧凑的簇所需要的相似属性参数。XLPE绝缘样片缺陷实验将气隙放电、沿面放电和电晕放电不同类型脉冲映射到feq-teq平面;XLPE电缆缺陷实验将不同位置的相同缺陷放电脉冲映射到feq-teq平面。结果表明,不同类型的缺陷产生的PD脉冲信号能有效形成自己的簇,电缆不同位置的缺陷产生的PD信号也能形成不同的簇。可见,feq-teq识别技术可为高压XLPE电缆的缺陷类型及放电源分离提供判断依据。The equivalent bandwidth-the equivalent time length （∫eq-teq） separation technique is studied theoretically, which is used to identify the partial discharge {PD} pulses in virtue of the pulse clusters in the two-dimension- al Cartesian coordinate system. Moreover, the similar parameters, which are necessary for the PD pulses to make a compact cluster in foq-to~ plane, are calculated. Defective XLPE samples are used to model the different partial dis- charges of cables such as air gas discharge, corona discharge and surface discharge, and the PD pulses are mapped in ∫eq-teq plane. Morover, PD pulses coming from the same defect but different places of XLPE cable are mapped in an- other ∫eq-teq plane. The results show that pulses coming from different defects can form different clusters in feq-teq plane. Similarly, pulses from the same defect but different places can form different clusters in ∫eq-teq plane, also. Accordingly, ∫eq-teq identification technique is efficient for analyzing the defect types and PD sources of high voltage XLPE cables.＂

关 键 词：局部放电(PD) 电力电缆 等效带宽 等效时间长度 局放信号识别 状态评估 

分 类 号：TM85[电气工程—高电压与绝缘技术]