基于宽频带声电检测的变压器现场局部放电诊断及定位方法  

On-site Partial Discharge Diagnosis and Location Method for Transformer Based on Broadband Combined Acoustic-Electrical Detection

作　　者：何宇航 丁理杰 周波 李敬雄 姚晓 周电波 HE Yuhang;DING Lijie;ZHOU Bo;LI Jingxiong;YAO Xiao;ZHOU Dianbo(State Grid Sichuan Electric Power Research Institute,Chengdu 610041,Sichuan,China;State Grid Chengdu Electric Power Supply Company,Chengdu 610095,Sichuan,China;State Grid Sichuan Extra High Voltage Company,Chengdu 610042,Sichuan,China)

机构地区：[1]国网四川省电力公司电力科学研究院,四川成都610041 [2]国网四川省电力公司成都供电公司,四川成都610095 [3]国网四川省电力公司四川超高压公司,四川成都610042

出　　处：《四川电力技术》2022年第5期58-63,69,共7页Sichuan Electric Power Technology

摘　　要：为提升变压器局部放电特高频信号检测灵敏度和抗干扰能力,研制了上限检测频率达480 MHz的特高频线圈传感器,其具备在变压器铁芯/夹件接地位置检测局部放电特高频电流信号的能力。在实验室设置局部放电模拟缺陷,研究了变压器悬浮电位放电和绝缘表面放电的信号特征,有助于对现场检测的信号进行类型识别。研究了变压器现场检测去干扰方法,在此基础上研究了基于宽频带声电检测的变压器现场局部放电诊断及定位方法,并进行了实测验证,检出110 kV变压器内部局部电位放电缺陷,有助于提升变压器局部放电现场检测水平和诊断准确性。For promoting the detection sensitivity of ultra high frequency(UHF) signals and anti-interference ability for transformer partial discharge, the UHF coil sensor with the upper limit detection frequency, that is 480 MHz, is researched, which can detect UHF current signal of partial discharge from the grounding positions of transformer core and clamps. The partial discharge simulated defect is set up in laboratory, and the signal characteristics of suspend potential discharge and insulating surface discharge of transformer are studied, which can help the type identification of signals detected on site. The anti-interference method for on-site transformer detection is also researched. On this basis, the on-site partial discharge diagnosis and location method of transformer based on broadband combined acoustic-electrical detection is proposed, and it is verified in a 110 kV transformer in which partial discharge defect is detected. So it can help to improve on-site detection level and diagnosis accuracy of transformer partial discharge.

关 键 词：变压器 局部放电 传感器 特高频 超声波 定位 

分 类 号：TM835[电气工程—高电压与绝缘技术]