220kV大截面XLPE电缆绝缘局部放电在线监测研究  

On-line Partial Discharge Monitoring of 220kV High Voltage Large Cross-section XLPE Insulated Cable

作　　者：王祖林 吴宏亮[1] WANG Zulin;WU Hongliang(Hebei Guohua Dingzhou Power Generation Co.,Ltd.,Baoding 073000,China)

机构地区：[1]河北国华定州发电有限责任公司,河北保定073000

出　　处：《大电机技术》2022年第6期62-67,共6页Large Electric Machine and Hydraulic Turbine

摘　　要：为了提高220kV大截面XLPE电缆在电力系统中的安全性,提出220kV大截面XLPE电缆绝缘局部放电在线监测方法。通过建立4种电缆绝缘缺陷模型,提取不同缺陷模型的局部放电信号,根据提取结果制定具有去噪效果的监测方案,采用GPRS网络传输监测数据,并利用小波变换原理,对监测信号进行降噪、去噪处理,实现对电缆局部放电的在线监测。实验结果表明,面对4种局部放电问题的在线监测方法,对照组的4种局部放电监测均与实验组存在约50pC的差异,实验组测试结果更加接近实际的放电量监测结果,其性能优于传统监测方法。In order to improve the safety of 220kV large cross-section XLPE cable in power system,an on-line monitoring method for insulation partial discharge of 220kV large cross-section XLPE cable is proposed in this paper.By establishing four kinds of cable insulation defect models,the partial discharge signals of different defect models are extracted,and a monitoring scheme with denoising effect is formulated according to the extraction results.The GPRS network is used to transmit monitoring data,and the principle of wavelet transform is used to denoise the monitoring signal,so as to realize the on-line monitoring of cable partial discharge.The experimental results show that in the face of four kinds of on-line monitoring methods,four kinds of PD monitoring methods in the control group are about 50pC different from those in the experimental group.The experimental group's test results are closer to the actual discharge monitoring results,and its performance is better than that of the traditional monitoring methods.

关 键 词：220kV大截面 XLPE电缆绝缘 局部放电 在线监测 

分 类 号：TM247[一般工业技术—材料科学与工程]