低气压对直流正极性导线地面合成电场特性影响的实验研究
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摘要
输电线路电磁环境与环境保护和工程投资密切相关,尤其在高海拔地区,直流线路地面合成电场已成为决定导线选择和线路结构参数的关键技术指标。为研究海拔和气压对直流线路地面合成电场的影响,在特高压直流试验基地人工气候环境实验室架设了单根正极性导线,对不同气压下地面合成电场和离子流密度进行了测量和分析,同时基于Deutsch假设的离子流场计算方法对地面合成电场和离子流密度进行了仿真,通过实测和计算结果的分析,获得了海拔和气压对正极导线起晕电压及离子迁移率的影响规律。研究结果表明:海拔每增加1000 m,正极导线起晕电压近似下降8.2%;随着气压的降低,离子的迁移率会逐渐增加,在分析海拔和气压对地面合成电场的影响时,还需要关注离子迁移率的影响。
Electromagnetic environment of transmission line is closely related to environment protection and project cost. Especially at high altitude area, total DC electric field becomes the key technical factor deciding conductor type and transmission line structure. In order to investigate influence of altitude and atmospheric pressure on total electric field, a single positive electrode was set up in artificial climate environment laboratory of the UHVDC test base of SGCC. In the experiment, the total electric field and ion current density on ground were measured and analyzed under different atmospheric pressures. In addition, on the basis of Deutsch hypothesis calculation method for ionized fields, the total electric field and ion current density were calculated and compared with the measurement results. Influence of altitude and atmospheric pressure on corona inception voltage and ion mobility was obtained. Results show that the positive corona inception voltage in the experiment decreases by nearly 8.2% as the altitude rises 1000 m. In addition, the ion mobility will increase with decrease of atmospheric pressure. This should be carefully considered when analyzing influence of altitude and atmospheric pressure on total DC electric fields.
Electromagnetic environment of transmission line is closely related to environment protection and project cost. Especially at high altitude area, total DC electric field becomes the key technical factor deciding conductor type and transmission line structure. In order to investigate influence of altitude and atmospheric pressure on total electric field, a single positive electrode was set up in artificial climate environment laboratory of the UHVDC test base of SGCC. In the experiment, the total electric field and ion current density on ground were measured and analyzed under different atmospheric pressures. In addition, on the basis of Deutsch hypothesis calculation method for ionized fields, the total electric field and ion current density were calculated and compared with the measurement results. Influence of altitude and atmospheric pressure on corona inception voltage and ion mobility was obtained. Results show that the positive corona inception voltage in the experiment decreases by nearly 8.2% as the altitude rises 1000 m. In addition, the ion mobility will increase with decrease of atmospheric pressure. This should be carefully considered when analyzing influence of altitude and atmospheric pressure on total DC electric fields.
引文
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[12]Bian Xingming,Wang Liming,Liu Yunpeng,et al.High altitude effect on corona inception voltages of DC power transmission conductors based on the mobile corona cage[J].IEEE Transactions on Power Delivery,2013,28(3):1971-1973.
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[16]张建功,张广洲,张小武,等.高海拔直流输电线路电场模拟试验和计算[J].高电压技术,2009,35(8):1970-1974.Zhang Jiangong,Zhang Guangzhou,Zhang Xiaowu,et al.Simulation experiment and calculation of DC electric field caused by DCtransmission line at high altitude districts[J].High Voltage Engineering,2009,35(8):1970-1974(in Chinese).
[17]DL/T 368-2010输电线路用绝缘子污秽外绝缘的高海拔修正[S].北京:国家能源局,2010.
[18]杨勇,陆家榆,鞠勇.基于Deutsch假设法和有限元法的高压直流线路地面合成电场对比分析[J].电网技术,2013,37(2):526-532.Yang Yong,Lu Jiayu,Ju Yong.Contrast and analysis on total electric field at ground level under HVDC transmission lines by Deutsch assumption-based method and finite element method[J].Power System Technology,2013,37(2):526-532(in Chinese).
[19]赵录兴,崔翔,陆家榆,等.直流输电线路地面合成电场测量方法探讨[J].中国电机工程学报,2018,38(2):644-652+695.Zhao Luxing,Cui Xiang,Lu Jiayu,et al.Discussion on measurement method of total electric field for DC transmission lines[J].Proceedings of the CSEE,2018,38(2):644-652+695(in Chinese).
[20]Lu Tiebing,Zhao Jie,Cui Xiang,et al.Analysis of ionized field under±800 kV HVDC transmission lines[C]//17th International Zurich Symposium on Electromagnetic Compatibility,Singapore,2006:416-419.
[21]Deutsch W.über die Dichtverteilung Unipolarer Ionenst?me[J]Annalen Der Physik,1933(5):589-613.
[22]Maruvada P S.Electric field and ion current environment of HVDCtransmission lines:Comparison of calculations and measurements[J].IEEE Transactions on Power Delivery,2012,27(1):401-410.
[2]Maruvada P S.Corona performance of high-voltage transmission lines[M].Baldock,Hertfordshire,UK:Research Studies Press Ltd,2000:64-77.
[3]舒印彪,张文亮.特高压输电若干关键技术研究[J].中国电机工程学报,2007,27(31):1-6.Shu Yinbiao,Zhang Wenliang.Research of key technologies for UHVtransmission[J].Proceedings of the CSEE,2007,27(31):1-6(in Chinese).
[4]Gildas H.Theoretical evaluation of Peek’s law[J].IEEE Trans on Industry Applications,1984,20(6):1647-1651.
[5]白江,阮江军,杜志叶,等.负直流电压下棒板间隙起晕电压计算方法[J].中国电机工程学报,2015,36(8):2305-2312.Bai Jiang,Ruan Jiangjun,Du Zhiye,et al.Calculation method for negative DC onset corona voltage in rod-plane gaps[J].Proceedings of the CSEE,2015,36(8):2305-2312(in Chinese).
[6]Yamazaki K,Olsen R G.Application of a corona onset criterion to calculation of corona onset voltage of stranded conductors[J].IEEETransactions on Dielectrics and Electrical Insulation,2004,11(4):674-680.
[7]El-Bahy M M,Abouelsaad M,Abdel-Gawad N,et al.Onset voltage of negative corona on stranded conductors[J].Journal of Physics D:Appl.Phys.2007,40(10):3094-3110.
[8]Lu Tiebing,Xiong Gaolin,Cui Xiang,et al.Analysis of corona onset electric field considering the effect of space charges[J].IEEETransactions on Magnetics,2011,47(5):1390-1393.
[9]Zheng Yuesheng,Zhang Bo,He Jinliang.Onset conditions for positive direct current corona discharges in air under the action of photoionization[J].Physics of Plasmas,2011(18):123503-1-123503-6.
[10]Li Xuebao,Cui Xiang,Zhao Luxing,et al.Analysis of positive DCcorona inception voltage of stranded conductor at different altitudes[C]//2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena,Des Moines America,2014:538-541.
[11]尤少华,刘云鹏,律方成,等.不同海拔下电晕笼分裂导线起晕电压的计算分析[J]中国电机工程学报,2012,32(4):169-177.You Shaohua,Liu Yunpeng,LüFangcheng,et al.Calculation and analysis on corona onset voltage of corona cage bundle conductors at different altitudes[J].Proceedings of the CSEE,2012,32(4):169-177(in Chinese).
[12]Bian Xingming,Wang Liming,Liu Yunpeng,et al.High altitude effect on corona inception voltages of DC power transmission conductors based on the mobile corona cage[J].IEEE Transactions on Power Delivery,2013,28(3):1971-1973.
[13]孟晓波,卞星明,陈枫林,等.负直流下绞线电晕起始电压分析[J].高电压技术,2011,34(9):1797-1801.Meng Xiaobo,Bian Xingming,Chen Fenglin,et al.Analysis on negative DC corona inception voltage of stranded conductors[J].High Voltage Engineering,2011,34(9):1797-1801(in Chinese).
[14]林锐.直流正极性下导线电晕放电特性及影响因素的研究[D].重庆:重庆大学,2009.
[15]张杰.海拔高度对直流离子流场影响的研究[J].高电压技术,1990,16(4):62-66.Zhang Jie.Research of influence of altitude on dc ion flow field[J].High Voltage Engineering,1990,16(4):62-66(in Chinese).
[16]张建功,张广洲,张小武,等.高海拔直流输电线路电场模拟试验和计算[J].高电压技术,2009,35(8):1970-1974.Zhang Jiangong,Zhang Guangzhou,Zhang Xiaowu,et al.Simulation experiment and calculation of DC electric field caused by DCtransmission line at high altitude districts[J].High Voltage Engineering,2009,35(8):1970-1974(in Chinese).
[17]DL/T 368-2010输电线路用绝缘子污秽外绝缘的高海拔修正[S].北京:国家能源局,2010.
[18]杨勇,陆家榆,鞠勇.基于Deutsch假设法和有限元法的高压直流线路地面合成电场对比分析[J].电网技术,2013,37(2):526-532.Yang Yong,Lu Jiayu,Ju Yong.Contrast and analysis on total electric field at ground level under HVDC transmission lines by Deutsch assumption-based method and finite element method[J].Power System Technology,2013,37(2):526-532(in Chinese).
[19]赵录兴,崔翔,陆家榆,等.直流输电线路地面合成电场测量方法探讨[J].中国电机工程学报,2018,38(2):644-652+695.Zhao Luxing,Cui Xiang,Lu Jiayu,et al.Discussion on measurement method of total electric field for DC transmission lines[J].Proceedings of the CSEE,2018,38(2):644-652+695(in Chinese).
[20]Lu Tiebing,Zhao Jie,Cui Xiang,et al.Analysis of ionized field under±800 kV HVDC transmission lines[C]//17th International Zurich Symposium on Electromagnetic Compatibility,Singapore,2006:416-419.
[21]Deutsch W.über die Dichtverteilung Unipolarer Ionenst?me[J]Annalen Der Physik,1933(5):589-613.
[22]Maruvada P S.Electric field and ion current environment of HVDCtransmission lines:Comparison of calculations and measurements[J].IEEE Transactions on Power Delivery,2012,27(1):401-410.