±800 kV特高压直流输电工程直流穿墙套管设计缺陷及其改进方法
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摘要
2011～2016年期间,运用在±800kV直流输电工程中的某类型直流穿墙套管先后6次发生故障,暴露出其在电气连接方面的一系列设计缺陷:均压罩等电位接触不良、表带触指接触电阻过大等。结合直流穿墙套管SF6分解产物超标、内部闪络、回路电阻超标、接头发热案例深入分析了直流穿墙套管故障的原因,总结了增加防松螺钉、等电位线、O型密封圈、接头镀银等改进措施,提出了增加等电位连接可靠性、保证通流裕度的直流穿墙套管设计建议,并提出重视SF6分解产物测试、增加回路电阻测试的运维建议。
DC wall bushing of certain type in ±800 kV UHVDC transmission projection successively malfunctioned six times, and exposing a series of design defects in its electrical design such as the bad contact of the equipotential shield electrode or the band connector, and so on. The paper deeply analyses fault causes of DC wall bushing through cases of SF_6 breakdown products over proof, internal flashover, loop resistance over proof, connector overheating.Improved methods such as increasing the locking screws, equipotential wires, seal rings and plating connector with silver are summarized. Design proposals of DC wall bushing such as increasing the reliability of equipotential connector and ensuring the current margin are proposed. The paper proposes the suggestions for operation and maintenance of paying more attention to SF_6 breakdown products and increasing the loop resistance test.
DC wall bushing of certain type in ±800 kV UHVDC transmission projection successively malfunctioned six times, and exposing a series of design defects in its electrical design such as the bad contact of the equipotential shield electrode or the band connector, and so on. The paper deeply analyses fault causes of DC wall bushing through cases of SF_6 breakdown products over proof, internal flashover, loop resistance over proof, connector overheating.Improved methods such as increasing the locking screws, equipotential wires, seal rings and plating connector with silver are summarized. Design proposals of DC wall bushing such as increasing the reliability of equipotential connector and ensuring the current margin are proposed. The paper proposes the suggestions for operation and maintenance of paying more attention to SF_6 breakdown products and increasing the loop resistance test.
引文
[1]潘国洪,朱华艳.±800 kV直流穿墙套管安装和现场试验关键技术研究[J].高压电器,2013,49(2):98-102.PAN Guohong,ZHU Huayan,Key technologies research for the installation and field test of±800 kV wall bushing[J].High Voltage Apparatus,2013,49(2):98-102.
[2]黎卫国,张长虹,夏谷林,等.1800 kV直流穿墙套管介损超标原因分析及改进措施[J].高压电器,2015,51(9):169-176.LI Weiguo, ZHANG Changhong, XIA Gulin, et al. Case study on abnormal dielectric loss of a±800 kV DC wall bushing with countermeasures[J]. High Voltage Apparatus,2015,51(9):169-176.
[3]陈忠,伍衡,黄和燕,等.1800 kV直流穿墙套管耐压试验发生外闪原因分析及改进措施[J].高电压技术,2011,37(9):2133-2139.CHEN Zhong, WU Heng, HUANG Heyan, et al. Cause analysis and improvement measure of±800 kV DC wall bushing occurring flashover during overvoltage withstand test[J]. High Voltage Engineering,2011,37(9):2133-2139.
[4]彭翔,陈禾,夏谷林,等.贵广直流输电工程换流变网侧高压套管事故分析及建议[J].变压器,2013,50(9):66-68.PENG Xiang, CHEN He, XIA Gulin, et al. Analysis and suggestions of converter transformer HV line side bushing for Gui-Guang HVDC project[J]. Transformer, 2013,50(9):66-68.
[5]王宇,李丽,姚唯建,等.模拟电气设备过热故障时SF_6气体分解产物的体积分数及其特征[J].高压电器,2011,47(1):62-69.WANG Yu, LI Li, YAO Weijian,et al. Analyzing decomposition products in overheat faults simulation to evaluate SF6 gas insulation device[J]. High Voltage Apparatus,2011,47(1):62-69.
[6]郭欣.变电站设备接头发热的分析及预防[J].青海电力,2009,28(z1):59-63.GUO Xin. Analysis on equipment connector heating in substation and prevention[J]. Qinghai Electric Power, 2009,28(z1):59-63.
[7]许杨,李锋锋,刘颀,等.SF_6分解物检测在高压直流套管故障诊断中的应用[J].中国电力,2013,46(7):61-65.XU Yang, LI Fengfeng, LIU Qi, et al. Application of detection technology of SF6 decomposition products to fault diagnoses of HVDC bushings[J]. Electric Power, 2013,46(7):61-65.
[8]何杰,吕永红,王四保,等.500 kV断路器均压电容器介质损耗超标分析[J].中国电力,2011,44(5):34-37.HE Jie, LYU Yonghong, WANG Sibao,et al. Studies ohyperscaling dielectric loss of grading capacitors of 500 kV breakers[J]. Electric Power,2011,44(5):34-37.
[9]梁方建,张道乾.GW5-110型隔离开关触头发热缺陷分析及检修处理[J].高压电器,2008,44(1):88-90.LIANG Fangjian, ZHANG Daoqian. Reason analysis and maintenance for overheat faults of type GW5-110 disconnector contact[J]. High Voltage Apparatus,2008,44(1):88-90.
[10]刘永,印华,姚强,等.气体分析技术在GIS故障定位和故障类型判断中的应用[J].高压电器,2009,45(3):132-134.LIU Yong, YIN Hua, YAO Qiang,et al. Application of gas analysis technology on the fault location and fault type diagnosis of GIS[J]. High Voltage Apparatus, 2009,45(3):132-134.
[11]电力设备预防性试验规程:Q/CSG 114002-2011[S]. 2011.Regulations for preventive test of electric power equipments:Q/CSG 114002-2011[S].2011.
[12]杨晓峰,张晗,邓军,等.超高压输变电设备发热缺陷的统计与分析处理[J].高压电器,2015,51(5):180-183.YANG Xiaofeng, ZHANG Han, DENG Jun,et al. Statistics and treatment of overheating defect of EHV power transmission equipment[J]. High Voltage Apparatus, 2015, 51(5):180-183.
[13]王文洪,何满棠.252 kV GIS设备罐体发热缺陷的原因分析[J].高压电器,2009,45(3):148-150.WANG Wenhong, HE Mantang. Analysis of tank heating fault of 252 kV GIS equipment[J]. High Voltage Apparatus,2009,45(3):148-150.
[14]季严松,王承玉,杨韧,等.SF_6气体分解产物检测技术及其在GIS设备故障诊断中的应用[J].高压电器,2011,47(2):100-103.JI Yansong,WANG Chengyu,YANG Ren,et al. Measuring technique of SF6 decomposition products and its application to fault diagnosis of GIS[J]. High Voltage Apparatus,2011,47(2):100-103.
[15]田兴旺,唐晓玲,吕家圣.红外诊断在高压直流输电系统阀电抗器发热故障分析中的应用[J].高压电器,2008,44(5):469-471.TIAN Xingwang,TANG Xiaoling,LYU Jiasheng. Application of infrared diagnosis in valve reactor overheat analysis of HVDC transmission project[J]. High Voltage Apparatus,2008,44(5):469-471.
[16]曾喜闻,凌云.GIS电流互感器局部过热原因分析及处理[J].湖北电力,2009,33(3):15.ZENG Xiwen, LING Yun. Cause analysis and treatment for partial excess temperature of GIS TA[J]. Hubei Electric Power, 2009,33(3):15.
[17]刘欢,邓科,付汉江,等.SF6气体分解物与GIS设备运行状态关系的探讨[J].高压电器,2013,49(10):127-132.LIU Huan, DENG Ke, FU Hanjiang, et al. Investigation on the relationship between SF_6 gas decomposition and GIS equipment operating status[J]. High Voltage Apparatus,2013,49(10):127-132.
[18]刘鹏,金海云,石惠承,等.特高压直流套管用环氧树脂/皱纹纸复合绝缘体系介电性能的研究[J].高压电器,2009,45(5):6-8.LIU Peng, JIN Haiyun,SHI Huicheng,et al. Investigationon dielectric properties of epoxy/crepe paper composites for ultra-high voltage DC bushing[J]. High Voltage Apparatus,2009,45(5):6-8.
[19]刘小刚,王茂忠,种芝艺,等.±500 kV阀厅电气连接及金具设计特点[J].电力建设,2011,32(9):24-29.LIU Xiaogang, WANG Maozhong, CHONG Zhiyi, et al. Electric connections and fittings design in vall hall of±500 kV Baoji converter station[J]. Electric Power Construction, 2011,32(9):24-29.
[20]王伟,韩金华,郭运明,等.一起进口套管烧损故障情况介绍[J].高压电器,2012,48(2):115-122.WANG Wei, HAN Jinhua, GUO Yunming, et al. Analysis of a burned-out failure of transformer bushing[J]. High Voltage Apparatus, 2012,48(2):115-122.
[21] KONCHITS V V,MYSHKIN N K.电接触理论、应用与技术[M].许良军、芦娜、林雪燕,译.北京:机械工业出版社,2010.KONCHITS V V, MYSHKIN N K. Electrical contacts fundamentals, applications and technology[M]. XU Liangjun,LU Na, LIN Xueyan, Translate. Beijing:China Machine Press, 2010.
[2]黎卫国,张长虹,夏谷林,等.1800 kV直流穿墙套管介损超标原因分析及改进措施[J].高压电器,2015,51(9):169-176.LI Weiguo, ZHANG Changhong, XIA Gulin, et al. Case study on abnormal dielectric loss of a±800 kV DC wall bushing with countermeasures[J]. High Voltage Apparatus,2015,51(9):169-176.
[3]陈忠,伍衡,黄和燕,等.1800 kV直流穿墙套管耐压试验发生外闪原因分析及改进措施[J].高电压技术,2011,37(9):2133-2139.CHEN Zhong, WU Heng, HUANG Heyan, et al. Cause analysis and improvement measure of±800 kV DC wall bushing occurring flashover during overvoltage withstand test[J]. High Voltage Engineering,2011,37(9):2133-2139.
[4]彭翔,陈禾,夏谷林,等.贵广直流输电工程换流变网侧高压套管事故分析及建议[J].变压器,2013,50(9):66-68.PENG Xiang, CHEN He, XIA Gulin, et al. Analysis and suggestions of converter transformer HV line side bushing for Gui-Guang HVDC project[J]. Transformer, 2013,50(9):66-68.
[5]王宇,李丽,姚唯建,等.模拟电气设备过热故障时SF_6气体分解产物的体积分数及其特征[J].高压电器,2011,47(1):62-69.WANG Yu, LI Li, YAO Weijian,et al. Analyzing decomposition products in overheat faults simulation to evaluate SF6 gas insulation device[J]. High Voltage Apparatus,2011,47(1):62-69.
[6]郭欣.变电站设备接头发热的分析及预防[J].青海电力,2009,28(z1):59-63.GUO Xin. Analysis on equipment connector heating in substation and prevention[J]. Qinghai Electric Power, 2009,28(z1):59-63.
[7]许杨,李锋锋,刘颀,等.SF_6分解物检测在高压直流套管故障诊断中的应用[J].中国电力,2013,46(7):61-65.XU Yang, LI Fengfeng, LIU Qi, et al. Application of detection technology of SF6 decomposition products to fault diagnoses of HVDC bushings[J]. Electric Power, 2013,46(7):61-65.
[8]何杰,吕永红,王四保,等.500 kV断路器均压电容器介质损耗超标分析[J].中国电力,2011,44(5):34-37.HE Jie, LYU Yonghong, WANG Sibao,et al. Studies ohyperscaling dielectric loss of grading capacitors of 500 kV breakers[J]. Electric Power,2011,44(5):34-37.
[9]梁方建,张道乾.GW5-110型隔离开关触头发热缺陷分析及检修处理[J].高压电器,2008,44(1):88-90.LIANG Fangjian, ZHANG Daoqian. Reason analysis and maintenance for overheat faults of type GW5-110 disconnector contact[J]. High Voltage Apparatus,2008,44(1):88-90.
[10]刘永,印华,姚强,等.气体分析技术在GIS故障定位和故障类型判断中的应用[J].高压电器,2009,45(3):132-134.LIU Yong, YIN Hua, YAO Qiang,et al. Application of gas analysis technology on the fault location and fault type diagnosis of GIS[J]. High Voltage Apparatus, 2009,45(3):132-134.
[11]电力设备预防性试验规程:Q/CSG 114002-2011[S]. 2011.Regulations for preventive test of electric power equipments:Q/CSG 114002-2011[S].2011.
[12]杨晓峰,张晗,邓军,等.超高压输变电设备发热缺陷的统计与分析处理[J].高压电器,2015,51(5):180-183.YANG Xiaofeng, ZHANG Han, DENG Jun,et al. Statistics and treatment of overheating defect of EHV power transmission equipment[J]. High Voltage Apparatus, 2015, 51(5):180-183.
[13]王文洪,何满棠.252 kV GIS设备罐体发热缺陷的原因分析[J].高压电器,2009,45(3):148-150.WANG Wenhong, HE Mantang. Analysis of tank heating fault of 252 kV GIS equipment[J]. High Voltage Apparatus,2009,45(3):148-150.
[14]季严松,王承玉,杨韧,等.SF_6气体分解产物检测技术及其在GIS设备故障诊断中的应用[J].高压电器,2011,47(2):100-103.JI Yansong,WANG Chengyu,YANG Ren,et al. Measuring technique of SF6 decomposition products and its application to fault diagnosis of GIS[J]. High Voltage Apparatus,2011,47(2):100-103.
[15]田兴旺,唐晓玲,吕家圣.红外诊断在高压直流输电系统阀电抗器发热故障分析中的应用[J].高压电器,2008,44(5):469-471.TIAN Xingwang,TANG Xiaoling,LYU Jiasheng. Application of infrared diagnosis in valve reactor overheat analysis of HVDC transmission project[J]. High Voltage Apparatus,2008,44(5):469-471.
[16]曾喜闻,凌云.GIS电流互感器局部过热原因分析及处理[J].湖北电力,2009,33(3):15.ZENG Xiwen, LING Yun. Cause analysis and treatment for partial excess temperature of GIS TA[J]. Hubei Electric Power, 2009,33(3):15.
[17]刘欢,邓科,付汉江,等.SF6气体分解物与GIS设备运行状态关系的探讨[J].高压电器,2013,49(10):127-132.LIU Huan, DENG Ke, FU Hanjiang, et al. Investigation on the relationship between SF_6 gas decomposition and GIS equipment operating status[J]. High Voltage Apparatus,2013,49(10):127-132.
[18]刘鹏,金海云,石惠承,等.特高压直流套管用环氧树脂/皱纹纸复合绝缘体系介电性能的研究[J].高压电器,2009,45(5):6-8.LIU Peng, JIN Haiyun,SHI Huicheng,et al. Investigationon dielectric properties of epoxy/crepe paper composites for ultra-high voltage DC bushing[J]. High Voltage Apparatus,2009,45(5):6-8.
[19]刘小刚,王茂忠,种芝艺,等.±500 kV阀厅电气连接及金具设计特点[J].电力建设,2011,32(9):24-29.LIU Xiaogang, WANG Maozhong, CHONG Zhiyi, et al. Electric connections and fittings design in vall hall of±500 kV Baoji converter station[J]. Electric Power Construction, 2011,32(9):24-29.
[20]王伟,韩金华,郭运明,等.一起进口套管烧损故障情况介绍[J].高压电器,2012,48(2):115-122.WANG Wei, HAN Jinhua, GUO Yunming, et al. Analysis of a burned-out failure of transformer bushing[J]. High Voltage Apparatus, 2012,48(2):115-122.
[21] KONCHITS V V,MYSHKIN N K.电接触理论、应用与技术[M].许良军、芦娜、林雪燕,译.北京:机械工业出版社,2010.KONCHITS V V, MYSHKIN N K. Electrical contacts fundamentals, applications and technology[M]. XU Liangjun,LU Na, LIN Xueyan, Translate. Beijing:China Machine Press, 2010.