基于局放定位的变压器铁芯多点接地故障诊断分析
邱炜,高竣,刘鑫,刘彦琴,杨红权,周波,郭超,程鹏,林岑
(国网四川省电力公司成都供电公司, 四川 成都 610041)
摘 要:针对某 110 kV 主变在运行中发现绝缘油中乙炔及总烃含量超标的问题,通过特高频、超声波等带电检测手段对主变内部缺陷进行分析和定位,并采用基于特高频局放信号的平分面法精确找到了放电缺陷的位置,通过对主变吊罩发现铁芯存在间歇性多点接地,成功验证了局放定位的准确性,经过分析放电原因及过程,给出了处理此类问题的应对建议。
关键词:主变;局放定位;铁芯;多点接地;油色谱
中图分类号:TM407 文献标识码:A 文章编号:1007-3175(2022)01-0036-06
Multi-Point Grounding Fault Diagnosis of the Transformer Iron Core
Based on PD Positioning Method
QIU Wei, GAO Jun, LIU Xin, LIU Yan-qin, YANG Hong-quan, ZHOU Bo, GUO Chao, CHENG Peng, LIN Cen
(Chengdu Power Supply Company, State Grid Sichuan Electric Power Company, Chengdu 610041, China)
Abstract: The acetylene and total hydrocarbon in the insulating oil exceed the criteria is a problem that exists in the operation of the 110 kV main transformer. This research used hot-line detection methods, such as ultra-high frequency (UHF) and ultrasonic waves, to analyze and locate the defects of the main transformer. It employed the bisection plane based on ultra-high frequency partial discharge signal to find the location of the discharge defect as well.The article also found the intermittent multi-point grounding of the iron core through the main transformer hanging cover and successfully verified the accuracy of the partial discharge positioning. It proposes suggestions to manage these problems after analyzing the cause and process of the discharge.
Key words: main transformer; PD positioning; iron core; multi-point grounding; oil chromatography
参考文献
[1] 周电波,王红梅,程江荣,等. 变压器局部放电多频段联合检测技术试验研究[J] . 高压电器,2018,54(11) :170-175.
[2] 郭志楠,韩洪刚,郭铁,等. 一台 220 kV 变压器油色谱异常分析与处理[J] . 变压器,2020,57(8) :64-66.
[3] STONE G C.Partial discharge diagnostics and electricalequipment insulation condition assessment [J] . IEEE Transactions on Dielectrics and Electrical Insulation,2005,12(5) :891-904.
[4] 李德军,沈威,郭志强. GIS 局部放电常规检测和超声波检测方法的应用比较[J] . 高压电器,2009,45(3) :99-103.
[5] 刘宏亮,丁斌,高树国,等. 基于宽频带脉冲电流法的变压器局部放电多端检测技术研究[J] . 高压电器,2018,54(11) :233-238.
[6] 汪一雄,方毅平,董卓,等. 变压器铁芯夹件多点接地故障分析处理[J] . 湖南电力,2016,36(3) :69-72.
[7] 王克峰,孙庆生,江和顺,等. 一起 500 kV 变压器稳钉悬浮放电故障的诊断与分析[J] . 高压电器,2012,48(3) :95-98.
[8] 杨春,孟丽坤,徐佩,等. 一起 500 kV 变压器局部过热故障分析[J]. 变压器,2021,58(2) :82-84.
[9] 罗旖旎,黄超. 变压器绕组的局部放电定位研究[J]. 变压器,2009,46(3) :43-46.
[10] 刘彦琴,刘君,周波,等. 声电联合法在主变局放缺陷定位中的现场应用[J] . 高压电器,2018,54(11) :239-244.
[11] 葛为民. 变压器局部放电超声定位的现场应用[J].高压电器,2005,41(5) :351-353.
[12] 王国利,郝艳捧,李彦明. 电力变压器局部放电定位方法的现状和前景[J]. 变压器,2001,38(11) :22-27.