基于数值仿真与多源聚类的GIS局部放电诊断与回归分析

发布时间：2018-08-27 15:12

【摘要】：为了更有效地指导GIS设备的状态检修工作,基于时域有限差分(FDTD)法仿真与多局部放电(简称局放)源聚类方法,诊断分析了一起1 100 kV气体绝缘组合电器(GIS)盆式绝缘子局放检测案例。首先,开展了现场与返厂试验下的GIS局部放电带电检测与定位,建立了与返厂测试工装结构相应的FDTD仿真模型,结合特高频(UHF)电磁波传播特性仿真,开展了多源局放定位技术研究。其次利用基于累积能量函数特征参量优化提取的多源局放分离算法,对该盆式绝缘子多UHF信号源开展了聚类分析;最后,利用GIS实验平台的回归模拟进一步分析了绝缘缺陷的检测差异性,验证了现场和返厂试验结果。试验结果表明:该特高压GIS盆式绝缘子检测发现的UHF谱图呈绝缘气隙类缺陷,但脉冲电流法下局放未见异常。局放聚类分析和定位结果表明:该盆式绝缘子一大一小2个UHF信号源,结合仿真的定位方法可有效减小常规定位计算方法的误差。回归分析表明:对于绝缘缺陷来说,UHF的灵敏度高于脉冲电流法,且随着试品电容量的增大,脉冲电流法的测试灵敏度逐渐下降,这可能是导致本盆式绝缘子中UHF信号与脉冲电流法检测差异的主要原因。研究结果可为GIS局部放电诊断提供参考。
[Abstract]:In order to guide the condition maintenance of GIS equipment more effectively, based on the simulation of finite-difference time-domain (FDTD) (FDTD) method and the multi-partial discharge (PD) source clustering method, A case of partial discharge detection of (GIS) basin insulator for 1 100 kV gas insulated composite appliance is diagnosed and analyzed. First of all, the GIS partial discharge live detection and localization under the field and factory return tests are carried out, and the FDTD simulation model corresponding to the back factory testing equipment structure is established. The simulation of the electromagnetic wave propagation characteristics of UHF (UHF) is combined with the simulation. The research of multi-source PD location technology is carried out. Secondly, the multi-source partial discharge separation algorithm based on the characteristic parameters of cumulative energy function is used to cluster the multi-UHF signal source of the basin insulator. Finally, The difference of insulation defect detection is further analyzed by using regression simulation of GIS experimental platform, and the results of field and factory return tests are verified. The experimental results show that the UHF spectrum of the UHV GIS basin insulator is of insulation gap type defect, but the partial discharge is not abnormal under the pulse current method. The results of partial discharge clustering analysis and location analysis show that the basin insulator is a large one and a small two UHF signal sources, combined with the simulation of the positioning method can effectively reduce the error of the conventional positioning calculation method. The regression analysis shows that the sensitivity of UHF for insulation defects is higher than that of pulse current method, and the sensitivity of pulse current method decreases with the increase of the capacity of the sample. This may be the main reason for the difference between the UHF signal and the pulse current method in the basin insulator. The results can provide a reference for the diagnosis of partial discharge in GIS.
【作者单位】：国网浙江省电力公司电力科学研究院;西安交通大学电力设备电气绝缘国家重点实验室;国网浙江省电力公司;
【基金】：中国博士后科学基金(2015M580848) 国家自然科学基金(51607140) 国网浙江省电力公司科技项目(5211DS15002P;5211DS14005Y)~~
【分类号】：TM595

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