500kV GIL三支柱绝缘子炸裂故障分析与防范措施
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摘要
为了解决一起500 kV GIL三支柱绝缘子炸裂故障,对故障GIL开展现场检查、返厂解体、应力仿真计算、缺陷模拟研究,采用同站运行的GIL单元为试品,开展GIL整体和关键部件工频耐压局放测试分析。研究结果表明:GIL三支柱绝缘子炸裂原因为三支柱绝缘子低电位金属嵌件与环氧树脂交界面存在小间隙,在运行过程中,小间隙逐渐劣化,导致交界面电场畸变,从局放异常发展为三支柱绝缘子炸裂。最后结合GIL三支柱绝缘子炸裂原因和三支柱绝缘子生产工艺流程提出了预防性的措施,为后续工程GIL生产运维提供借鉴。
In order to investigate the reasons of the burst fault of three-pillar insulator used in 500 kV GIL,different methods such as on-site inspection,disintegration in the factory,stress and defects simulations were applied.The AC withstand voltage and partial discharge tests were carried out on a GIL unit and a three-pillar insulator.The GIL unit under test has the same type as the one broken in the burst fault.The results show that the burst was aroused by a small gap located at the interface between metal insert and epoxy resin.The metal insert was installed in a low potential region of the three-pillar insulator.The small gap was gradually carbonized due to the strong electric field.The small gap leaded to the distortion of the electric field distribution and partial discharge.The abnormal partial discharges eventually developed into the burst fault in the three-pillar insulator.Finally,some protecting measures are put forward according to the burst reasons and manufacturing processes of three-pillar insulators.This experience provides a reference for operation maintenance and manufacture of GIL and its three-pillar insulators.
In order to investigate the reasons of the burst fault of three-pillar insulator used in 500 kV GIL,different methods such as on-site inspection,disintegration in the factory,stress and defects simulations were applied.The AC withstand voltage and partial discharge tests were carried out on a GIL unit and a three-pillar insulator.The GIL unit under test has the same type as the one broken in the burst fault.The results show that the burst was aroused by a small gap located at the interface between metal insert and epoxy resin.The metal insert was installed in a low potential region of the three-pillar insulator.The small gap was gradually carbonized due to the strong electric field.The small gap leaded to the distortion of the electric field distribution and partial discharge.The abnormal partial discharges eventually developed into the burst fault in the three-pillar insulator.Finally,some protecting measures are put forward according to the burst reasons and manufacturing processes of three-pillar insulators.This experience provides a reference for operation maintenance and manufacture of GIL and its three-pillar insulators.
引文
[1]范建斌,李鹏,李金忠,等.±800 kV特高压直流GIL关键技术研究[J].中国电机工程学报,2008,5(13):1-7.FAN Jianbin,LI Peng,LI Jinzhong,et al.Study on key technology of±800 kV UHVDC GIL[J].Proceedings of the CSEE,2008,5(13):1-7.
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[3]杨琪.GIL与GIS母线的结构特点与应用[J].高压电器,2011,47(8):72-74.YANG Qi.Characteristics and applications of GIL and GIS bus[J].High Voltage Apparatus,2011,47(8):72-74.
[4]阮全荣,李晖,刘国锋,等.高落差垂直竖井GIL隔室设置的研究[J].高压电器,2010,46(8):52-55.RUAN Quanrong,LI Hui,LIU Guofeng,et al.Research on arrangement of GIL compartment in high drop vertical shaft[J].High Voltage Apparatus,2010,46(8):52-55.
[5]齐波,张贵新,李成榕,等.气体绝缘金属封闭输电线路的研究现状及应用前景[J].高电压技术,2015,41(5):1466-1473.QI Bo,ZHANG Guixin,LI Chengrong,et al.Research status and prospect of gas-insulated metal enclosed transmission line[J].High Voltage Engineering,2015,41(5):1466-1473.
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[8]尚涛,李果.气体绝缘输电线路的特点及其应用[J].南方电网技术,2011,5(1):81-84.SHANG Tao,LI Guo.Discussion on the characteristics of GIL and its application in power systems[J].Southern Power System Technology,2011,5(1):81-84.
[9]马仲鸣,李六零,BOWMAN G,等.800 kV气体绝缘金属封闭输电线路及竖井安装[J].中国电力,2008,41(8):44-47.MA Zhongming,LI Liuling,BOWMAN G,et al.800 kVgas insulated transmission lines and shaft installation[J].Electric Power,2008,41(8):44-47.
[10]陈琳,雷鸣,汤鑫.气体绝缘输电线路的结构特点及安装方式的探讨[J].高压电器,2013,49(5):120-123.CHEN Lin,LEI Ming,SHANG Xin.Discussion on the structural features and installation method of the gas-insulated transmission lines[J].High Voltage Apparatus,2013,49(5):120-123.
[11]雷鸣,陈琳.关于GIL和GIS母线产品基本结构尺寸设计探讨[J].高压电器,2013,49(4):128-133.LEI Ming,CHEN Lin.Structure design of GIL and GISbus[J].High Voltage Apparatus,2013,49(4):128-133.
[12]雷鸣,陈琳.关于GIL和GIS母线产品基本结构尺寸设计探讨[J].高压电器,2013,49(4):128-133.LEI Ming,CHEN Lin.Structure design of GIL and GISbus[J].High Voltage Apparatus,2013,49(4):128-133.
[13]黎斌.SF6高压电器设计[M].北京:机械工业出版社2003.
[14]高凯,李莉华.气体绝缘输电线路技术及其应用[J].中国电力,2007,40(1):84-88.GAO Kai,LI Lihua.Technology and application of gasinsulated transmission lines[J].Electric Power,2007,40(1):84-88.
[15]张磊,陈芯蕊,张景锋.500 kV气体绝缘金属封闭输电线路在泗泾变电站的应用[J].电力科学与工程,2012,28(6):64-68.ZHANG Lei,CHEN Xinrui,ZHANG Jingfeng.Application 500 kV gas insulated transmission line in Sijing substation[J].Electric Power Science and Engineering,2012,28(6):64-68.
[16]汤浩,吴广宁,范建斌,等.直流气体绝缘输电线路的绝缘设计[J].电网技术,2008,32(6):65-70.SHANG Hao,WU Guangning,FAN Jianbin,et al.Insulation design of gas insulated HVDC transmission line[J].Power System Technology,2008,32(6):65-70.
[17]徐国政,关永刚.GIS和GIL外壳环流及损耗的简化分析和估算[J].高电压技术,2009,35(2):247-249.XU Guozheng,GUAN Yonggang.Simplified analysis and calculation on circulating current and power loss in enclosure of GIS and GIL[J].High Voltage Engineering,2009,35(2):247-249.
[18]王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2007.
[19]气体绝缘金属封闭输电线路技术条件DL/T 978-2005[S].2005.Specification for Gas-insulated meta-l enclosed transmission line DL/T 978-2005[S].2005.
[20]高压交流断路器GB 1984-2014[S].2014.High-voltage alternating-current circuit-breakers GB1984-2014[S].2014.
[2]阮全荣,施围,桑志强.750 kV GIL在拉西瓦水电站应用需考虑的问题[J].高压电器,2003,8(4):66-69.RUAN Quanrong,SHI Wei,SANG Zhiqiang.Questions to be considered for using 750 kV GIL at La Xi Wa Hydroelectric power station[J].High Voltage Apparatus,2003,8(4):66-69.
[3]杨琪.GIL与GIS母线的结构特点与应用[J].高压电器,2011,47(8):72-74.YANG Qi.Characteristics and applications of GIL and GIS bus[J].High Voltage Apparatus,2011,47(8):72-74.
[4]阮全荣,李晖,刘国锋,等.高落差垂直竖井GIL隔室设置的研究[J].高压电器,2010,46(8):52-55.RUAN Quanrong,LI Hui,LIU Guofeng,et al.Research on arrangement of GIL compartment in high drop vertical shaft[J].High Voltage Apparatus,2010,46(8):52-55.
[5]齐波,张贵新,李成榕,等.气体绝缘金属封闭输电线路的研究现状及应用前景[J].高电压技术,2015,41(5):1466-1473.QI Bo,ZHANG Guixin,LI Chengrong,et al.Research status and prospect of gas-insulated metal enclosed transmission line[J].High Voltage Engineering,2015,41(5):1466-1473.
[6]BENATO R,DI MARIO C,KOCH H.High-capability applications of long gas-insulated lines in structures[J].IEEE Transactions on Power Delivery,2007,22(1):619-626.
[7]范建斌.气体绝缘金属封闭输电线路及其应用[J].中国电力,2008,41(8):38-43.FAN Jianbin.Gas insulated metal enclosed transmission line(GIL)and its application[J].Electric Power,2008,41(8):38-43.
[8]尚涛,李果.气体绝缘输电线路的特点及其应用[J].南方电网技术,2011,5(1):81-84.SHANG Tao,LI Guo.Discussion on the characteristics of GIL and its application in power systems[J].Southern Power System Technology,2011,5(1):81-84.
[9]马仲鸣,李六零,BOWMAN G,等.800 kV气体绝缘金属封闭输电线路及竖井安装[J].中国电力,2008,41(8):44-47.MA Zhongming,LI Liuling,BOWMAN G,et al.800 kVgas insulated transmission lines and shaft installation[J].Electric Power,2008,41(8):44-47.
[10]陈琳,雷鸣,汤鑫.气体绝缘输电线路的结构特点及安装方式的探讨[J].高压电器,2013,49(5):120-123.CHEN Lin,LEI Ming,SHANG Xin.Discussion on the structural features and installation method of the gas-insulated transmission lines[J].High Voltage Apparatus,2013,49(5):120-123.
[11]雷鸣,陈琳.关于GIL和GIS母线产品基本结构尺寸设计探讨[J].高压电器,2013,49(4):128-133.LEI Ming,CHEN Lin.Structure design of GIL and GISbus[J].High Voltage Apparatus,2013,49(4):128-133.
[12]雷鸣,陈琳.关于GIL和GIS母线产品基本结构尺寸设计探讨[J].高压电器,2013,49(4):128-133.LEI Ming,CHEN Lin.Structure design of GIL and GISbus[J].High Voltage Apparatus,2013,49(4):128-133.
[13]黎斌.SF6高压电器设计[M].北京:机械工业出版社2003.
[14]高凯,李莉华.气体绝缘输电线路技术及其应用[J].中国电力,2007,40(1):84-88.GAO Kai,LI Lihua.Technology and application of gasinsulated transmission lines[J].Electric Power,2007,40(1):84-88.
[15]张磊,陈芯蕊,张景锋.500 kV气体绝缘金属封闭输电线路在泗泾变电站的应用[J].电力科学与工程,2012,28(6):64-68.ZHANG Lei,CHEN Xinrui,ZHANG Jingfeng.Application 500 kV gas insulated transmission line in Sijing substation[J].Electric Power Science and Engineering,2012,28(6):64-68.
[16]汤浩,吴广宁,范建斌,等.直流气体绝缘输电线路的绝缘设计[J].电网技术,2008,32(6):65-70.SHANG Hao,WU Guangning,FAN Jianbin,et al.Insulation design of gas insulated HVDC transmission line[J].Power System Technology,2008,32(6):65-70.
[17]徐国政,关永刚.GIS和GIL外壳环流及损耗的简化分析和估算[J].高电压技术,2009,35(2):247-249.XU Guozheng,GUAN Yonggang.Simplified analysis and calculation on circulating current and power loss in enclosure of GIS and GIL[J].High Voltage Engineering,2009,35(2):247-249.
[18]王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2007.
[19]气体绝缘金属封闭输电线路技术条件DL/T 978-2005[S].2005.Specification for Gas-insulated meta-l enclosed transmission line DL/T 978-2005[S].2005.
[20]高压交流断路器GB 1984-2014[S].2014.High-voltage alternating-current circuit-breakers GB1984-2014[S].2014.