长期运行导线交流电晕效应的变化
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摘要
长期运行导线的电晕效应是输电线路面临的重要问题之一,国内外早期的研究结论不能较好地预测我国长期运行导线电晕效应的变化,为深入研究长期运行导线的交流电晕放电特性和表面状态的内在关系,测量了北京、武汉、广州地区典型的交流500kV长期运行导线表面状态及粗糙程度;分析了长期运行导线表面状态发生变化的原因,即由于大气相对湿度高、年平均气温高、工业污染物较多、离海洋近等因素,造成该地区导线表面粗糙程度升高。通过在电晕笼和模拟架空导线中的初步研究,发现电力系统中长期运行导线的电晕放电程度比新导线剧烈,起晕电压比新导线下降,可听噪声和无线电干扰有所升高。在自然环境较好的地区短期运行导线表面粗糙程度比新导线低,因此其电晕效应比新导线有所改善,这与国外的研究规律一致。
Corona effects and its related electromagnetic environment on AC long-term operated conductors are important problems to be resolved for transmission lines.However,the conclusions obtained from earlier domestic and overseas works cannot well reflect the surface conditions and corona discharge effects of long-term operated conductors.In order to investigate the relation between surface conditions and corona effects for long-term operated conductors,we measured the surface conditions and roughness degree of the AC 500 kV conductor samples from areas near Beijing,Wuhan,and Guangzhou,and analyzed the variation of the surface conditions for the long-term operated conductors.The roughness degree may increase in the area where the relative humidity,temperature,and contamination in the environment are relatively high and close to the sea.According to corona tests in a corona cage on a simulative overhead line,it is found that the corona discharge intensity for long-term operated conductors is much stronger than that for new ones;hence,the corona inception voltages for aged conductors are lower while the audible noise and radio noise are higher than those of the new ones.In circumstances with better nature conditions,the surface roughness degree of short-term operated conductor can be less than that of new ones,hence,the corona discharge on the conductor is improved,which is in accordance with the earlier conclusions abroad.
Corona effects and its related electromagnetic environment on AC long-term operated conductors are important problems to be resolved for transmission lines.However,the conclusions obtained from earlier domestic and overseas works cannot well reflect the surface conditions and corona discharge effects of long-term operated conductors.In order to investigate the relation between surface conditions and corona effects for long-term operated conductors,we measured the surface conditions and roughness degree of the AC 500 kV conductor samples from areas near Beijing,Wuhan,and Guangzhou,and analyzed the variation of the surface conditions for the long-term operated conductors.The roughness degree may increase in the area where the relative humidity,temperature,and contamination in the environment are relatively high and close to the sea.According to corona tests in a corona cage on a simulative overhead line,it is found that the corona discharge intensity for long-term operated conductors is much stronger than that for new ones;hence,the corona inception voltages for aged conductors are lower while the audible noise and radio noise are higher than those of the new ones.In circumstances with better nature conditions,the surface roughness degree of short-term operated conductor can be less than that of new ones,hence,the corona discharge on the conductor is improved,which is in accordance with the earlier conclusions abroad.
引文
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[2]李先志,梁明,李澄宇,等.±1100kV特高压直流输电线路按电磁环境条件的导线设计[J].高电压技术,2012,38(12):3284-3291.LI Xianzhi,LIANG Ming,LI Chengyu,et al.Design consider-ation of conductor bundles of±1100kV DC transmission lines according to electromagnetic environmental criterion[J].High Voltage Engineering,2012,38(12):3284-3291.
[3]舒印彪,胡毅.交流特高压输电线路关键技术的研究及应用[J].中国电机工程学报,2007,27(36):1-7.SHU Yinbiao,HU Yi.Research and application of the key technologies of UHV AC transmission line[J].Proceedings of the CSEE,2007,27(36):1-7.
[4]Comber M G,Nigbor R J.Audible noise performance of regular and asymmetric bundles and effect of conductor aging on project UHV's three-phase test line[J].IEEE Transactions on Power Apparatus and Systems,1979,98(2):561-572.
[5]Chartier V L,Perry D E.Discussion of M G Comber,R J Nig-bor Audible noise performance of regular and asymmetric bun-dles and effect of conductor aging on project UHV’s three-phase test line[J].IEEE Transactions on Power Apparatus and Sys-tems,1979,98(2):569-570.
[6]Booker J R.Natural aging of non-energized alumium conductors[J].IEEE Transactions on Power Delivery,1986,1(4):269-274.
[7]Andreson J G.Transmission line reference book345kV and above[M].2nd ed.Palo Alto,USA:Electric Power Research Institute,1982:182-186.
[8]Chartier V L.Discussion of J R Booker.Natural aging of non-energized alumium conductors[J].IEEE Transactions on Power Delivery,1986,1(4):274.
[9]唐剑,杨迎建,何金良,等.1000kV级特高压交流电晕笼设计关键问题探讨[J].高电压技术,2007,33(4):1-5.TANG Jian,YANG Yingjian,HE Jinliang,et al.Discussion on key problems in the design of1000kV ultra-high voltage ac co-rona cage[J].High Voltage Engineering,2007,33(4):1-5.
[10]唐剑,何金良,杨迎建,等.特高压电晕笼防护段的设计[J].高电压技术,2007,33(3):17-20.TANG Jian,HE Jinliang,YANG Yingjian,et al.Design of shielding sections of ultra-high voltage corona cage[J].High Voltage Engineering,2007,33(3):17-20.
[11]Bian X M,Chen L,Yu D M,et al.Influence of aged conduc-tor surface conditions on AC corona-generated audible noise with a corona cage[J].IEEE Transactions on Dielectrics and Electrical Insulation,2012,19(6):2037-2043.
[12]Juette G W,Zaffanella L E.Predetermination of radio noise,audible noise,and corona loss of EHV and UHV transmission lines under rain based on cage tests[J].IEEE Transactions on Power Apparatus and Systems,1970,89(2):1168-1174.
[13]Urban R G,Reader H C,Holtzhausen J P.Small corona cage for wideband HVAC radio noise studies rationale and critical design[J].IEEE Transactions on Power Delivery,2008,23(6):1150-1157.
[14]Chen L,Bian X M,Wang L M,et al.Effect of rain drops on corona discharge in alternating current transmission lines with a corona cage[J].Japanese Journal of Applied Physics,2012,51(9):09MG02.
[15]陈澜,卞星明,陈枫林,等.电晕笼内导线交流电晕起始电压判断方法[J].高电压技术,2011,37(1):85-90.CHEN Lan,BIAN Xingming,CHEN Fenglin,et al.Method to judge corona inception voltage of AC transmission lines using corona cage[J].High Voltage Engineering,2011,37(1):85-90.
[16]尤少华,刘云鹏,律方成,等.电晕笼单根导线电晕损失等效修正系数试验研究[J].高电压技术,2011,37(10):2410-2417.YOU Shaohua,LIU Yunpeng,LFangcheng,et al.Test re-search on corona cage single conductor’s corona loss equivalent correction factor[J].High Voltage Engineering,2011,37(10):2410-2417.
[17]律方成,尤少华,刘云鹏,等.电晕笼中分裂导线交流电晕损失计算分析[J].高电压技术,2011,37(12):2878-2885.LFangcheng,YOU Shaohua,LIU Yunpeng,et al.Calcula-tion and analysis of bundle conductors’ac corona loss in corona cage[J].High Voltage Engineering,2011,37(12):2878-2885.
[18]Liu Y P,You S H,LüF C,et al.500kV EHV bundle con-ductors’corona onset voltage calculation and analysis in corona cage at different altitudes[J].IEEE Transactions on Power Delivery,2012,27(4):2090-2097.
[19]Bian X M,Chen Y,Liu Y P,et al.Investigation on altitude correction factor of corona inception voltage/electric field of ac transmission lines based on the mobile corona cage[C]∥XVIII International Conference on Gas Discharges and Their Applica-tions.Greifswald,Germany:[s.n.],2010:316-319.
[20]Bian X M,Wang L M,Guan Z C,et al.Experimental investi-gation on altitude correction factor of positive DC corona incep-tion voltages of transmission lines based on the mobile corona cage[C]∥IEEE Conference on High Voltage Engineering andApplication.New Orleans,USA:IEEE,2010:548-551.
[21]唐剑,何金良,刘云鹏,等.海拔对导线交流电晕可听噪声影响的电晕笼试验结果与分析[J].中国电机工程学报,2010,30(4):105-111.TANG Jian,HE Jinliang,LIU Yunpeng,et al.Test results and analysis of altitude-change effect on audible noise of AC co-rona occurring on conductors with corona-test cage[J].Pro-ceedings of the CSEE,2010,30(4):105-111.
[22]Bian X M,Yu D M,Wu X,et al.Experimental investigation on altitude correction factor of radio noise generated from posi-tive DC transmission lines based on the mobile corona cage[C]∥The15th Asian Conference on Electrical Discharge.Xi’an,China:[s.n.],2010:344-348.
[23]陈豫朝,谢辉春,张业茂,等.基于电晕笼的特高压交流输电线路可听噪声预测方法[J].高电压技术,2012,38(9):2189-2194.CHEN Yuchao,XIE Huichun,ZHANG Yemao,et al.Audi-ble noise prediction of UHVAC transmission lines based on co-rona cage[J].High Voltage Engineering,2012,38(9):2189-2194.
[24]唐剑,杨迎建,李永双,等.特高压交流输电线路电晕效应的预测方法,Ⅱ:无线电干扰[J].高电压技术,2011,37(12):2942-2947.TANG Jian,YANG Yingjian,LI Yongshuang,et al.Predic-tion of corona effects generated from UHVAC transmission lines,Ⅱ:radio noise[J].High Voltage Engineering,2011,37(12):2942-2947.
[25]尹晗,郭剑,张波,等.直流电晕笼中离子流场的计算[J].高电压技术,2011,37(3):758-764.YIN Han,GUO Jian,ZHANG Bo,et al.Calculation of the ion flow field in the DC corona cage[J].High Voltage Engi-neering,2011,37(3):758-764.
[26]Bian X M,Yu D M,Meng X B,et al.Corona-generated space charge effects on electric field distribution for an indoor corona cage and a monopolar test line[J].IEEE Transactions on Die-lectrics and Electrical Insulation,2011,18(5):1767-1778.
[27]Suda T.Aging effects of conductor surface conditions on dc co-rona characteristics[J].IEEE Transactions on Power Delivery,1988,3(4):1903-1912.
[28]赵宇明,麻敏华,关志成,等.导线污秽对高压直流输电线路电晕特性的影响[J].高电压技术,2007,33(12):49-54.ZHAO Yuming,MA Minhua,GUAN Zhicheng,et al.Influ-ence of contaminations of the conductor on HVDC transmission line corona characteristics[J].High Voltage Engineering,2007,33(12):49-54.
[29]Ma M H,Zhao Y M,Guan Z C,et al.The influence of con-taminations on HVDC conductor corona characteristics[C]∥IEEE Conference on Electrical Insulation and Dielectric Phe-nomena.Vancouver,Canada:IEEE,2007:537-541.
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