交直流复合电压下铜颗粒在油中的分布及对绝缘油击穿特性的影响
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摘要
为了研究交直流复合电压下固体颗粒在绝缘油中的运动分布特性及对油绝缘性能影响机理,对比分析了两种电极下,绝缘油中微米级铜颗粒在交流、直流及交直流复合电压1:1、1:3下的运动分布状态,测量了不同颗粒浓度绝缘油在四种电压类型下的击穿电压,并结合颗粒运动分布特性分析了铜颗粒对绝缘油击穿电压的影响规律。研究表明:提高施加电压直流分量和颗粒浓度均会加速"铜颗粒小桥"的形成并显著增大油隙间的传导电流;含铜颗粒绝缘油在交直流复合电压下的击穿电压均近似符合Weibull分布规律,绝缘油的击穿电压随施加电压直流分量的提高而降低,击穿电压与颗粒浓度的对数lg N呈线性关系。
In order to study the motion distribution of solid particles and its influence on breakdown strength of insulating oil under combined AC and DC voltages, the motion distribution of copper microparticles and the breakdown voltage of insulating oil with different particle concentration under AC voltage, DC voltage and the combined AC and DC voltage with the ratio of AC to DC equal to 1 and 1/3 of two different electrode systems are investigated in this paper. The copper particle effect on the breakdown strength of insulating oil is discussed with the motion distribution of particle. The results show that the increase of DC component and particle concentration will promote the formation of copper particle bridge and increase the conduction current significantly. The breakdown voltage of insulating oil with copper particle at combined AC and DC voltage approximately obeys Weibull distribution. The breakdown voltage of insulating oil decreases with the increase of the DC voltage component in combined AC and DC voltage. Meanwhile, the breakdown voltage and the logarithm of particle number approximately satisfy the linear relationship.
In order to study the motion distribution of solid particles and its influence on breakdown strength of insulating oil under combined AC and DC voltages, the motion distribution of copper microparticles and the breakdown voltage of insulating oil with different particle concentration under AC voltage, DC voltage and the combined AC and DC voltage with the ratio of AC to DC equal to 1 and 1/3 of two different electrode systems are investigated in this paper. The copper particle effect on the breakdown strength of insulating oil is discussed with the motion distribution of particle. The results show that the increase of DC component and particle concentration will promote the formation of copper particle bridge and increase the conduction current significantly. The breakdown voltage of insulating oil with copper particle at combined AC and DC voltage approximately obeys Weibull distribution. The breakdown voltage of insulating oil decreases with the increase of the DC voltage component in combined AC and DC voltage. Meanwhile, the breakdown voltage and the logarithm of particle number approximately satisfy the linear relationship.
引文
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[22]Birlasekaran S.The measurement of charge on single particles in transformer oil[J].IEEE Transactions on Electrical Insulation,1991,26(6):1094-1103.
[23]王健,李庆民,李伯涛,等.考虑非弹性随机碰撞与SF6/N2混合气体影响的直流GIL球形金属微粒运动行为研究[J].中国电机工程学报,2015,35(15):3971-3978.Wang Jian,Li Qingmin,Li Botao,et al.Motion analysis of spherical conducting particle in DC GILconsidering the influence of inelastic random collisions and SF6/N2 gaseous mixture[J].Proceedings of the CSEE,2015,35(15):3971-3978.
[24]Birlasekaran S,Darveniza M.Microdischarges from particles in transformer oil[J].IEEE Transactions on Electrical Insulation,1976,4(EI-11):162-163.
[25]Zhu Songming,Zareifard M R,Chen Cuiren,et al.Electrical conductivity of particle-fluid mixtures in ohmic heating:measurement and simulation[J].Food Research International,2010,43(6):1666-1672.
[26]李金忠,张乔根,李原,等.直流电压下油纸绝缘杂质小桥的形成过程[J].高电压技术,2016,42(12):3901-3908.Li Jinzhong,Zhang Qiaogen,Li Yuan,et al.Generation process of impurity bridges in oil-paper insulation under DC voltage[J].High Voltage Engineering,2016,42(12):3901-3908.
[2]贾轩涛,严兵,王亚涛,等.特高压换流站设备分期投运安全隔离措施的研究[J].电气技术,2015,16(5):89-94.Jia Xuantao,Yan Bing,Wang Yatao,et al.Research on security isolation scheme of equipments energized partly in the UHVDC project converter station[J].Electrical Engineering,2015,16(5):89-94.
[3]周加斌.油中悬移微粒产生的局部放电特性与特征提取研究[D].重庆:重庆大学,2012.
[4]吴昊,齐波,李成榕,等.基于Kerr效应法的油纸复合绝缘交直流复合电场测量[J].电工技术学报,2013,28(4):28-34.Wu Hao,Qi Bo,Li Chengrong,et al.The measurement of AC-DC composite field for oil-paper insulation system based on the Kerr electro-optic effect[J].Transactions of China Electrotechnical Society,2013,28(4):28-34.
[5]廖瑞金,王季宇,袁媛,等.换流变压器下新型纤维素绝缘纸特性综述[J].电工技术学报,2016,31(10):1-15.Liao Ruijin,Wang Jiyu,Yuan Yuan,et al.Review on the characteristic of new cellulose insulation paper used in the converter transformer[J].Transactions of China Electrotechnical Society,2016,31(10):1-15.
[6]Wang Youyuan,Li Yuanlong,Wei Chao,et al.Copper particle effect on the breakdown strength of insulating oil at combined AC and DC voltage[J].Journal of Electrical Engineering&Technology,2017,12(2):865-873.
[7]Wang Xiaogbing,Wang Zhongdong.Particle effect on breakdown voltage of mineral and ester based transformer oils[C]//IEEE Conference on Electrical Insulation and Dielectric Phenomena,Quebec,Canada,2008:598-602.
[8]王淑娟,时璟丽,王景春,等.变压器油中大颗粒杂质对油局部放电的影响[J].高电压技术,1994,20(4):26-29.Wang Shujuan,Shi Jingli,Wang Jingchun,et al.The effect of a macro-particle on the partial discharge property of transformer oil[J].High Voltage Engineering,1994,20(4):26-29.
[9]Wang Xiaogbing,Wang Zhongdong,Noakhes J.Motion of conductive particles and the effect on AC breakdown strengths of esters[C]//IEEE International Conference on Dielectric Liquids,Trondheim,Norway,2011:1-4.
[10]Krins M,Borsi H,Gockenbach E.Influence of carbon particles on the breakdown voltage of transformer oil[C]//IEEE International Conference on Conduction and Breakdown in Dielectric Liquids,Roma,Italy,1996:296-299.
[11]付守海,王淑娟.变压器油中导电颗粒运动轨迹的计算[J].现代电力,1999,16(2):30-37.Fu Shouhai,Wang Shujuan.The calculation of particle trajectory of conductive particle in transformer oil[J].Modern Electric Power,1999,16(2):30-37.
[12]Zhang Jing,Wang Feipeng,Li Jian,et al.Influence of copper particles on breakdown voltage and frequencydependent dielectric property of vegetable insulating oil[J].Energies,2017,10(7):1-13.
[13]贾江波,查玮,杨连殿,等.直流电压下绝缘子附近球形导电微粒运动起始电压研究[J].西安交通大学学报,2006,40(6):699-703.Jia Jiangbo,Zha Wei,Yang Liandian,et al.Threshold voltage of spherical conducting particle motion near spacer[J].Journal of Xian Jiaotong University,2006,40(6):699-703.
[14]贾江波,张乔根,师晓岩,等.交流电压下绝缘子附近导电微粒运动特性[J].电工技术学报,2008,23(5):7-11.Jia Jiangbo,Zhang Qiaogen,Shi Xiaoyan,et al.Motion of conducting particle near PTFE spacer under AC voltage[J].Transactions of China Electrotechnical Society,2008,23(5):7-11.
[15]Dascalescu L,Mihailescu M,Tobazeon R.Modeling of conductive particle behavior in insulating fluids affected by DC electric fields[J].IEEE Transactions on Industry Applications,1998,34(1):66-74.
[16]李智.500kV变压器绝缘油的颗粒污染度监测[J].变压器,1999,36(9):31-34.Li Zhi.Monitoring the particle pollution degree of500kV transformer's insulation oil[J].Transformer,1999,36(9):31-34.
[17]CIGRE working group 17 of study committe 12.Effect of particles on transformer dielectric strength[R].CIGRE,2000.
[18]IEC 60156-1995 Insulating liquids-determination of the breakdown voltage at power frequency-test method[S].1995.
[19]Mahmud S,Chen G,Golosnoy I O,et al.Experimental studies of influence of DC and AC electric fields on bridging in contaminated transformer oil[J].IEEETransactions on Dielectrics&Electrical Insulation,2014,22(1):152-160.
[20]Lai C D,Xie M.Stochastic ageing and dependence for reliability[M].London:Springer Science&Business Media,2006.
[21]律方成,刘宏宇,李志兵,等.直流电压下SF6气体中电极覆膜对金属微粒启举的影响机理[J].电工技术学报,2017,32(13):239-247.LüFangcheng,Liu Hongyu,Li Zhibing,et al.Influence mechanism of dielectric coated electrodes on metallic particle lift-off in SF6 gas under DCvoltage[J].Transactions of China Electrotechnical Society,2017,32(13):239-247.
[22]Birlasekaran S.The measurement of charge on single particles in transformer oil[J].IEEE Transactions on Electrical Insulation,1991,26(6):1094-1103.
[23]王健,李庆民,李伯涛,等.考虑非弹性随机碰撞与SF6/N2混合气体影响的直流GIL球形金属微粒运动行为研究[J].中国电机工程学报,2015,35(15):3971-3978.Wang Jian,Li Qingmin,Li Botao,et al.Motion analysis of spherical conducting particle in DC GILconsidering the influence of inelastic random collisions and SF6/N2 gaseous mixture[J].Proceedings of the CSEE,2015,35(15):3971-3978.
[24]Birlasekaran S,Darveniza M.Microdischarges from particles in transformer oil[J].IEEE Transactions on Electrical Insulation,1976,4(EI-11):162-163.
[25]Zhu Songming,Zareifard M R,Chen Cuiren,et al.Electrical conductivity of particle-fluid mixtures in ohmic heating:measurement and simulation[J].Food Research International,2010,43(6):1666-1672.
[26]李金忠,张乔根,李原,等.直流电压下油纸绝缘杂质小桥的形成过程[J].高电压技术,2016,42(12):3901-3908.Li Jinzhong,Zhang Qiaogen,Li Yuan,et al.Generation process of impurity bridges in oil-paper insulation under DC voltage[J].High Voltage Engineering,2016,42(12):3901-3908.