直流下交联聚乙烯电缆局部放电的试验特性研究

发布时间：2019-03-30 16:51

【摘要】：为研究直流电压下交联聚乙烯(cross linked polyethylene,XLPE)电缆绝缘局部放电特性,搭建了一套XLPE电缆直流局部放电试验及检测系统,使用直流局放仪和高频电流法(high frequency current method,HFCT)检测。使用YJV 120mm2单芯电缆设计并制作了绝缘内部气隙、主绝缘表面划伤、高压端毛刺电晕、半导电层爬电4类绝缘缺陷模型,并使用Comsol Multi-physics软件仿真了不同缺陷模型的电场分布特性。使用恒压法试验,绘制了时间分辨局放图谱(time-resolved partial discharge,TRPD)记录放电发展过程,并基于统计特征绘制了H(Q,Δt)图谱和4类典型指纹图谱。综合分析试验和仿真研究结果表明:1)电晕缺陷模型电场畸变最严重,气隙缺陷次之;2)划伤缺陷和爬电缺陷的放电起始电压明显高于另外两者;3)4类缺陷模型的起始放电阶段和稳定发展阶段均存在差异,划伤缺陷起始放电量很大,并存在两个较明显的放电水平,气隙和电晕缺陷起始阶段放电量和放电重率均随时间递增;4)不同类型放电的H(Q,Δt)图谱差异较明显,指纹图谱随机性较大,其中电晕缺陷的指纹图谱线性规律最明显。
[Abstract]:In order to study the partial discharge (PD) characteristics of XLPE (cross linked polyethylene,XLPE) cable insulation under DC voltage, a set of DC PD test and detection system for XLPE cable was set up, which was detected by DC PD instrument and high frequency current method (high frequency current method,HFCT). YJV 120mm2 single core cable is used to design and make four kinds of insulation defect models, such as internal insulation air gap, main insulation surface scratch, high-voltage end burr corona, semi-conductive layer creeping insulation defect model. The electric field distribution characteristics of different defect models are simulated by Comsol Multi-physics software. The time-resolved partial discharge atlas (time-resolved partial discharge,TRPD) was used to record the process of discharge development. Based on the statistical characteristics, the H (Q, 螖 t and four types of typical fingerprints were plotted. The results of comprehensive analysis and simulation show that: 1) the electric field distortion of corona defect model is the most serious, followed by air gap defect; 2) the discharge initiation voltage of scratch defect and creeping defect is obviously higher than the other two; 3) there are differences between the initial discharge stage and the stable development stage of the four kinds of defect models, and the initial discharge quantity of the scratch defect is very large, and there are two obvious discharge levels. The discharge rate and discharge weight rate of air gap and corona defect in the initial stage increased with time. 4) the H (Q, 螖 t) profiles of different types of discharge are obviously different, and the randomness of fingerprints is large, among which the linear law of corona defect is the most obvious.
【作者单位】：上海交通大学电气工程系;国网浙江省电力公司舟山供电公司;
【基金】：基金项目:国家重点基础研究发展计划项目(973计划)(2014CB239506) 国家电网公司科技项目资助(52110115007J)~~
【分类号】：TM855

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