特高压换流站直流分压器二次侧过电压保护
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摘要
特高压换流站遭受雷击时,将造成接地网暂态地电位升高。雷击引发的接地网暂态电位升高具有电压幅值高、频率范围宽等特征,其产生的瞬态电位能通过传导的方式耦合至直流分压器二次侧导致过电压保护器件动作。如果分压器二次侧过电压保护器件动作后不能及时恢复将引发继保装置误动作。阐述了直流分压器暂态响应特性,搭建了直流分压器模拟试验电路,开展了直流分压器二次侧放电管的动作恢复特性试验,并通过EMTP软件进行了仿真研究。结果表明目前换流站直流分压器二次回路放电管动作后不能迅速恢复工作状态而导致双极闭锁,而放电管串联压敏电阻方案对限制直流分压器同极性过电压侵扰并使分压器回路快速恢复至正常工作状态具有一定作用,实测与仿真研究结果可为特高压换流站内直流分压器二次系统的过电压防护设计提供参考。
When UHV converter station is struck by lightning, the transient ground potential of grounding grid will increase. The transient potential rise of grounding grid caused by lightning stroke is characterized by high voltage amplitude and wide frequency range, and its generated transient potential can be coupled to the secondary side of DC divider by conduction, causing action of overvoltage protection device. If the overvoltage protection device in divider secondary side cannot be recovered in time after action, it will cause maloperation of the relay protection device. In this paper, the transient response characteristics of DC divider are described, a simulation test circuit of DC divider is set up, the action recovery characteristic test of DC divider secondary discharge tube is performed, and simulation research is carried out with EMTP software. Results show that the discharge tube in DC divider secondary circuit in converter station cannot quickly restore its normal working state after action, leading to bipolar block. However, the series varistor scheme of discharge tube has certain effect on limiting the interference of DC divider with the same polarity overvoltage and making the DC divider restore to normal working condition quickly. The measured and simulated results can provide reference for design of overvoltage protection of DC divider secondary system in UHV converter station.
When UHV converter station is struck by lightning, the transient ground potential of grounding grid will increase. The transient potential rise of grounding grid caused by lightning stroke is characterized by high voltage amplitude and wide frequency range, and its generated transient potential can be coupled to the secondary side of DC divider by conduction, causing action of overvoltage protection device. If the overvoltage protection device in divider secondary side cannot be recovered in time after action, it will cause maloperation of the relay protection device. In this paper, the transient response characteristics of DC divider are described, a simulation test circuit of DC divider is set up, the action recovery characteristic test of DC divider secondary discharge tube is performed, and simulation research is carried out with EMTP software. Results show that the discharge tube in DC divider secondary circuit in converter station cannot quickly restore its normal working state after action, leading to bipolar block. However, the series varistor scheme of discharge tube has certain effect on limiting the interference of DC divider with the same polarity overvoltage and making the DC divider restore to normal working condition quickly. The measured and simulated results can provide reference for design of overvoltage protection of DC divider secondary system in UHV converter station.
引文
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[14]孙萍.有关输电线路防雷计算中几个参数取值的建议[J].电网技术,1998,22(8):75-78.Sun Ping.Some suggestions on setting of parameter values in lightning protection calculation for transmission lines[J].Power System Technology,1998,22(8):75-78(in Chinese).
[15]张翠霞,李汝彪,葛栋,等.浙江省110和220kV敞开式变电站雷害事故分析[J].电网技术,2011,35(2):159-162.Zhang Cuixia,Li Rubiao,Ge Dong,et al.Analysis on lightning accidents of circuit breakers installed in 110kV and 220 kV open type substations in Zhejiang province and prevention measures[J].Power System Technology,2011,35(2):159-162(in Chinese).
[16]赵淳,阮江军,陈家宏,等.三维激光扫描技术在输电线路差异化防雷治理中的应用[J].电网技术,2012,36(1):195-200.Zhao Chun,Ruan Jiangjun,Chen Jiahong,et al.Application of three dimensional laser scanning technology in differentiated lightning protection for transmission lines[J].Power System Technology,2012,36(1):195-200(in Chinese).
[17]Rabde V P.Metal oxide varistors as surge suppressors[C]//Proceeding of International Conference on Electromagnetic Interference and Compatibility,Hyderabad,India.1997:315-319.
[18]杨敏,陈俊武,熊军.浪涌抑制技术[J].电瓷避雷器,2005(6):28-30.Yang Min,Chen Junwu,Xiong Jun.Surge suppression technique[J].Electric Porcelain Arrester,2005(6):28-30(in Chinese).
[19]王鸿钰,陆虹.浪涌保护器在电子设备中的应用[J].仪表技术,2016(4):34-36.Wang Hongyu,Lu Hong.Application of surge protector in electronic equipment[J].Instrumentation Technology,2016(4):34-36(in Chinese).
[20]王贺新,刘念,刘航宇,等.浪涌保护器在变电站二次系统防雷保护中的应用[J].四川电力技术,2015(3):58-61.Wang Hexin,Liu Nian,Liu Hangyu,et al.Application of surge protector in lightning protection of substation secondary system[J].Sichuan Electric Power Technology,2015(3):58-61(in Chinese).
[2]何金良,张波,曾嵘,等.1000 kV特高压变电站接地系统的设计[J].中国电机工程学报,2009,29(7):7-12.He Jinliang,Zhang Bo,Zeng Rong,et al.Design of earthing system for 1000kV UHV substation[J].Proceedings of the CSEE,2009,29(7):7-12(in Chinese).
[3]Giao T N,Sarma M P.Effect of two-layer earth on the electric field near HVDC ground electrodes[J].IEEE Transactions on Power Apparatus and Systems,1972,91(6):2356-2365.
[4]Dawalibe F,Mukhedkar D.Optimum design of substation grounding in two-layer earth structure:Part I,II,III[J].IEEE Transactions on Power Apparatus and Systems,1975,94(2):257-272.
[5]Carrus A,Cinieri E,Fumi A,et al.Short tail lightning impulse behaviour of medium voltage line insulation[J].IEEE Transactions on Power Delivery,1999,14(1):218-226.
[6]何金良,康鹏,曾崎,等.青藏铁路输变电工程五道梁和沱沱河变电站的接地系统设计[J].电网技术,2006,30(4):60-64.He Jinliang,Kang Peng,Zeng Qi,et al.Design of grounding system for Wudaoliang and Tuotuohe substations of Qinghai-Tibet railway power transmission and transformation project[J].Power System Technology,2006,30(4):60-64(in Chinese).
[7]Grcev L,Popov M.On high-frequency circuit equivalents of a vertical ground rod[J].IEEE Transactions on Power Delivery,2005,20(9):1598-1603.
[8]齐磊,崔翔,赵志斌.复杂接地系统冲击接地特性的数值计算及试验[J].电网技术,2006,30(13):66-69.Qi Lei,Cui Xiang,Zhao Zhibin.Numerical calculation and test of impact earthing characteristics of complex grounding system[J].Power System Technology,2006,30(13):66-69(in Chinese).
[9]于刚,何金良,茹必成.开关操作暂态电压对变电所二次电缆的电磁干扰[J].电工技术杂志,2002(12):19-22.Yu Gang,He Jinliang,Ru Bicheng.Electromagnetic interference of switching transient voltage on secondary cables of substation[J].Journal of Electric Engineering,2002(12):19-22(in Chinese).
[10]Mao Bicheng,He Jinliang,Chen Shuiming,et al.Electromagnetic interference in low voltage secondary system of substation caused by short circuit fault[C]//2002 3rd International Symposium on Electromagnetic Compatibility,Beijing,China.2002:178-181.
[11]李清泉,李彦明,牛亚民.变电站开关操作引起的瞬变电磁场及其防护[J].高电压技术,2001,27(4):35-37.Li Qingquan,Li Yanming,Niu Yamin.Transient electromagnetic field caused by switching operation in substation and its protection[J].High Voltage Engineering,2001,27(4):35-37(in Chinese).
[12]Zhang Bo,Cui Xiang,Zhao Zhibin,et al.Numerical analysis of the influence between large grounding grids and two-end grounded cables by the moment method coupled with circuit equations[J].IEEETransactions on Power Delivery,2005,20(2):731-737.
[13]杜澍春.关于输电线路防雷计算中若干参数及方法的修改建议[J].电网技术,1996,20(12):53-56.Du Shuchun.Suggestion on revising the calculation method and some parameters used in lightning protection of transmission lines[J].Power System Technology,1996,20(12):53-56(in Chinese).
[14]孙萍.有关输电线路防雷计算中几个参数取值的建议[J].电网技术,1998,22(8):75-78.Sun Ping.Some suggestions on setting of parameter values in lightning protection calculation for transmission lines[J].Power System Technology,1998,22(8):75-78(in Chinese).
[15]张翠霞,李汝彪,葛栋,等.浙江省110和220kV敞开式变电站雷害事故分析[J].电网技术,2011,35(2):159-162.Zhang Cuixia,Li Rubiao,Ge Dong,et al.Analysis on lightning accidents of circuit breakers installed in 110kV and 220 kV open type substations in Zhejiang province and prevention measures[J].Power System Technology,2011,35(2):159-162(in Chinese).
[16]赵淳,阮江军,陈家宏,等.三维激光扫描技术在输电线路差异化防雷治理中的应用[J].电网技术,2012,36(1):195-200.Zhao Chun,Ruan Jiangjun,Chen Jiahong,et al.Application of three dimensional laser scanning technology in differentiated lightning protection for transmission lines[J].Power System Technology,2012,36(1):195-200(in Chinese).
[17]Rabde V P.Metal oxide varistors as surge suppressors[C]//Proceeding of International Conference on Electromagnetic Interference and Compatibility,Hyderabad,India.1997:315-319.
[18]杨敏,陈俊武,熊军.浪涌抑制技术[J].电瓷避雷器,2005(6):28-30.Yang Min,Chen Junwu,Xiong Jun.Surge suppression technique[J].Electric Porcelain Arrester,2005(6):28-30(in Chinese).
[19]王鸿钰,陆虹.浪涌保护器在电子设备中的应用[J].仪表技术,2016(4):34-36.Wang Hongyu,Lu Hong.Application of surge protector in electronic equipment[J].Instrumentation Technology,2016(4):34-36(in Chinese).
[20]王贺新,刘念,刘航宇,等.浪涌保护器在变电站二次系统防雷保护中的应用[J].四川电力技术,2015(3):58-61.Wang Hexin,Liu Nian,Liu Hangyu,et al.Application of surge protector in lightning protection of substation secondary system[J].Sichuan Electric Power Technology,2015(3):58-61(in Chinese).