一起220 kV油浸倒置式CT异常发热缺陷诊断分析
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摘要
红外检测作为电流互感器(CT)带电检测的重要手段,能快速、实时地带电检测和诊断出设备的大多数异常发热缺陷,防止出现故障。文中首先分析了广州电网自2005年来电流互感器红外带电检测开展的工作质效,发现红外检测可有效检测高压电流互感器缺陷。然后具体分析了一起红外检测发现的220 kV倒置式CT综合致热型缺陷,从现场高压介损试验、绝缘油试验以及局放试验多方法、多维度相结合对发现异常的电流互感器进行了综合诊断分析,明确了异常CT内部缺陷存在。最后通过停电检修解体,发现了异常CT膨胀器内部缺油,器身存在褶皱和泡沫状异物等缺陷,为该型CT的运维提供了经验借鉴。
Infrared detection is one of the important on-live detection techniques for current transformer(CT). By usingthis technique,most cases of the overheating and discharge faults of CT can be detected and diagnosed quickly,therebypreventing certain failures. In this paper,the quality and efficiency of the on-live infrared detection for the CTs inGuangzhou electric power company since 2005 is analyzed firstly. It indicates that the on-live infrared detection can de-tect the faults of the high voltage current transformer effectively. Then a family defect of a 220 kV inversion current trans-former found by an infrared live detection is analyzed in detail. Combined with dielectric loss test,insulation oil test andpartial discharge(PD)test,a comprehensive diagnosis of the abnormal current transformer is carried out,and the exis-tence of the internal defects in the abnormal CT is clearly defined. Finally,through the maintenance the defects in the ab-normal CT are found,such as lack of oil inside the expander and folds and foamy foreign body inside the expander.
Infrared detection is one of the important on-live detection techniques for current transformer(CT). By usingthis technique,most cases of the overheating and discharge faults of CT can be detected and diagnosed quickly,therebypreventing certain failures. In this paper,the quality and efficiency of the on-live infrared detection for the CTs inGuangzhou electric power company since 2005 is analyzed firstly. It indicates that the on-live infrared detection can de-tect the faults of the high voltage current transformer effectively. Then a family defect of a 220 kV inversion current trans-former found by an infrared live detection is analyzed in detail. Combined with dielectric loss test,insulation oil test andpartial discharge(PD)test,a comprehensive diagnosis of the abnormal current transformer is carried out,and the exis-tence of the internal defects in the abnormal CT is clearly defined. Finally,through the maintenance the defects in the ab-normal CT are found,such as lack of oil inside the expander and folds and foamy foreign body inside the expander.
引文
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[13]王世阁.倒置式电流互感器运行状况分析及提高安全运行性能的建议[J].变压器,2009,46(9):64-68.WANG Shige.Operation analysis of inverted current transformer and suggestion to improve operational safety[J].Transformer,2009,46(9):64-68.
[14]刘凯,汲胜昌,钟理鹏,等.500 kV SF6电流互感器电容屏缺陷下的气体分解特性[J].西安交通大学学报,2017,51(2):111-120.LIU Kai,JI Shengchang,ZHONG Lipeng,et al.Gas decomaosition characteristics under capacitive screen defect in SF6 current transformer[J].Journal of Xi’an Jiaotong University,2017,51(2):111-120.
[15]李艳鹏,张海,米康民.电力设备典型缺陷红外诊断研究[J].山西电力,2016(6):8-10.LI Yanpeng,ZHANG Hai,MI Kangmin.Research of infrared diagnosis of electrical equipment typical defects[J].Shanxi Electric Power,2016(6):8-10.
[16]尚国良,李娜.电容式电压互感器电磁单元发热分析[J].山东电力技术,2017,44(4):74-76.SHANG Guoliang,LI Na.Electromagnetic unit heating analysis of capacitor voltage transformers[J].Shandong Electric Power,2017,44(4):74-76.
[17]傅坚.电压致热效应引起的设备故障的红外诊断[J].华东电力,2007,35(3):66-67.FU Jian.Infrared diagnosis for voltagecaused thermal faults of equipment[J].East China Electric Power,2007,35(3):66-67.
[18]刘亮,蒋鑫,师普辛,等.发电机出口电压互感器绝缘缺陷检测方法[J].电网技术,2016,40(12):3966-3972.LIU Liang,JIANG Xin,SHI Puxin,et al.A novel methodology for insulation defect detection in voltage transformer in251generator circuit[J].Power System Technology,2016,40(12):3966-3972.
[19]杨贤,饶章权,柯春俊,等.广东电网输变电设备带电检测技术应用现状及提升策略[J].南方电网技术,2015,9(3):68-74.YANG Xian,RAO Zhangquan,KE Chunjun,et al.Application status and promotion strategy of live detection technologies of transmission and distribution equipment in Guangdong power grid[J].Southern Power System Technology,2015,9(3):68-74.
[20]郭文笔,段肖力,朱仁,等.红外热像与DGA联合诊断电压互感器局放缺陷[J].湖南电力,2016,36(2):57-59.252GUO Wenbi,DUAN Xiaoli,ZHU Ren,et al.Partial discharge diagnosis of voltage transformer combininginfrared thermography and oil chromatographic analysis[J].Hunan Electric Power,2016,36(2):57-59.
[21]赵世华,刘赟,叶会生,等.一起GIS中电磁式电压互感器缺陷分析[J].电力学报,2017,32(1):35-48.ZHAO Shihua,LIU Yun,YE Huisheng,et al.A defect analysis for electromagnetic voltage transformer in GIS[J].Journal of Electric Power,2017,32(1):35-48.
[2]严文群.变压器内部金属部件之间接触不良引起的过热故障诊断及处理[J].高压电器,2010,46(11):103-106.YAN Wenqun.Overheating fault diagnosis and treatment of transformer caused by poor contact between metal parts[J].High Voltage Apparatus,2010,46(11):103-106.
[3]陈宝怡.红外诊断技术在高压断路器内部发热故障中的应用[J].高压电器,2011,47(5):92-95.CHEN Baoyi.Application of infrared diagnostic technology in high voltage circuit breaker internal heat fault[J].High Voltage Apparatus,2011,47(5):92-95.
[4]陈衡,侯善敬.电力设备故障红外诊断[M].北京:中国电力出版社,1999.CHEN Heng,HOU Shanjing.Electric power equipmentfailure infrared diagnosing[M].Beijing:China Electric Power Press,1999.
[5]朱建军,王赟中,崔绍平,等.红外技术诊断高压电气设备内部缺陷[J].高电压技术,2004,30(7):34-36.ZHU Jianjun,WANG Yunzhong,CUI Shaoping,et al.The application of infrared diagnosis technology in diagnosis of the high voltage electrical equipment internal defect[J].High Voltage Engineering,2004,30(7):34-36.
[6]葛猛,李鹏,陶安培,等.220 kV电流互感器局部放电缺陷不停电检测与分析[J].高压电器,2009,45(6):153-155.GE Meng,LI Peng,TAO Anpei,et al.On-line detection and analysis of partial-discharge FAULT for 220 kVcurrent transformer[J].High Voltage Apparatus,2009,45(6):153-155.
[7]武胜斌,郑研,陈志彬.基于红外测温技术的GIS导体温度在线监测的方案[J].高压电器,2009,45(4):100-102.WU Shengbin,ZHENG Yan,CHEN Zhibin.An on-line monitoring scheme of conductor temperature in GIS based on infrared temperature measurement[J].High Voltage Apparatus,2009,45(4):100-102.
[8]张良胜,张杰.红外在线监测系统在封闭开关柜中的应用[J].电网技术,2008,32(s1):150-153.ZHANG Liangsheng,ZHANG Jie.Application of switchtanktemperature online monitor system based on infrared[J].Power System Technology,2008,32(s1):150-153.
[9]曹春梅,张晓宏.红外热诊断技术在电力系统中的应用[J].激光与红外,2006,36(s1):781-784.CAO Chunmei,ZHANG Xiaohong.The application ofinfrared thermo diagnosis in electric system[J].Laser&Infrared,2006,36(s1):781-784.
[10]带电设备红外诊断技术应用导则:DL/T 664-2016[S].2016.Charged equipment infrared diagnosingtechnology application guideline:DL/T 664-2016[S].2016.
[11]江礓,张富刚,樊越甫,等.110 kV变电站电压互感器故障原因分析[J].电力自动化设备,2010,30(10):139-140.JIANG Jiang,ZHANG Fugang,FAN Yuefu,et al.Fault analysis of 110 kV substation PT[J].Electric Power Automation Equipment,2010,30(10):139-140.
[12]MAHAJAN S M,ROBALINO D M,SIVAN V.Thermal modeling of an inverted-type oil-immersed current transformer[J].IEEE Transactions on Power Delivery,2010,25(4):2511-2518.
[13]王世阁.倒置式电流互感器运行状况分析及提高安全运行性能的建议[J].变压器,2009,46(9):64-68.WANG Shige.Operation analysis of inverted current transformer and suggestion to improve operational safety[J].Transformer,2009,46(9):64-68.
[14]刘凯,汲胜昌,钟理鹏,等.500 kV SF6电流互感器电容屏缺陷下的气体分解特性[J].西安交通大学学报,2017,51(2):111-120.LIU Kai,JI Shengchang,ZHONG Lipeng,et al.Gas decomaosition characteristics under capacitive screen defect in SF6 current transformer[J].Journal of Xi’an Jiaotong University,2017,51(2):111-120.
[15]李艳鹏,张海,米康民.电力设备典型缺陷红外诊断研究[J].山西电力,2016(6):8-10.LI Yanpeng,ZHANG Hai,MI Kangmin.Research of infrared diagnosis of electrical equipment typical defects[J].Shanxi Electric Power,2016(6):8-10.
[16]尚国良,李娜.电容式电压互感器电磁单元发热分析[J].山东电力技术,2017,44(4):74-76.SHANG Guoliang,LI Na.Electromagnetic unit heating analysis of capacitor voltage transformers[J].Shandong Electric Power,2017,44(4):74-76.
[17]傅坚.电压致热效应引起的设备故障的红外诊断[J].华东电力,2007,35(3):66-67.FU Jian.Infrared diagnosis for voltagecaused thermal faults of equipment[J].East China Electric Power,2007,35(3):66-67.
[18]刘亮,蒋鑫,师普辛,等.发电机出口电压互感器绝缘缺陷检测方法[J].电网技术,2016,40(12):3966-3972.LIU Liang,JIANG Xin,SHI Puxin,et al.A novel methodology for insulation defect detection in voltage transformer in251generator circuit[J].Power System Technology,2016,40(12):3966-3972.
[19]杨贤,饶章权,柯春俊,等.广东电网输变电设备带电检测技术应用现状及提升策略[J].南方电网技术,2015,9(3):68-74.YANG Xian,RAO Zhangquan,KE Chunjun,et al.Application status and promotion strategy of live detection technologies of transmission and distribution equipment in Guangdong power grid[J].Southern Power System Technology,2015,9(3):68-74.
[20]郭文笔,段肖力,朱仁,等.红外热像与DGA联合诊断电压互感器局放缺陷[J].湖南电力,2016,36(2):57-59.252GUO Wenbi,DUAN Xiaoli,ZHU Ren,et al.Partial discharge diagnosis of voltage transformer combininginfrared thermography and oil chromatographic analysis[J].Hunan Electric Power,2016,36(2):57-59.
[21]赵世华,刘赟,叶会生,等.一起GIS中电磁式电压互感器缺陷分析[J].电力学报,2017,32(1):35-48.ZHAO Shihua,LIU Yun,YE Huisheng,et al.A defect analysis for electromagnetic voltage transformer in GIS[J].Journal of Electric Power,2017,32(1):35-48.