界面空间电荷对高压直流电缆终端电场分布的影响
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摘要
为了分析高压直流电缆终端主绝缘与加强绝缘界面空间电荷分布对直流电缆终端最大场强的影响,应用电声脉冲法测试了交联聚乙烯与非线性硅橡胶双层介质中的空间电荷分布。根据界面空间电荷分布特性,确定空间电荷包参数,并应用多物理场耦合软件COMSOL Multiphysics仿真分析了考虑界面空间电荷时的高压直流电缆终端电场分布。结果发现:高压直流电缆终端的电场分布受交联聚乙烯和非线性硅橡胶界面空间电荷及其在绝缘层中分布的影响,界面空间电荷分布的中心峰值小于2 C/m~3时,空间电荷对电缆终端内电场分布的影响不明显;空间电荷分布峰值大于2 C/m~3时,绝缘层中的空间电荷分布越宽,终端内最大场强越大。
In order to analyze the influence of space charge distribution in the main insulation and reinforced insulation on the maximum field strength in the high voltage DC cable terminal, the space charge distribution in the double-layer dielectric and its interface of cross-linked polyethylene and non-linear silicone rubber is measured by electro-acoustic pulse method. According to the interfacial space charge distribution characteristics, and by means of the space charge packet parameters, the maximum field strength in the high voltage DC cable terminal is analyzed by COMSOL Multiphysics simulation software. It is found that the electric field distribution in the high-voltage DC cable terminal is affected by the interfacial space charge and the space charge distribution in cross-linked polyethylene and nonlinear silicone rubber.When the peak value of the interface space charge is less than 2 C/m~3, the effect of space charge on the electric field distribution in the cable termination is not obvious. When the peak value is greater than 2 C/m~3, the wider the space charge distribution in the insulation layer, the larger the maximum field strength in the cable terminal.
In order to analyze the influence of space charge distribution in the main insulation and reinforced insulation on the maximum field strength in the high voltage DC cable terminal, the space charge distribution in the double-layer dielectric and its interface of cross-linked polyethylene and non-linear silicone rubber is measured by electro-acoustic pulse method. According to the interfacial space charge distribution characteristics, and by means of the space charge packet parameters, the maximum field strength in the high voltage DC cable terminal is analyzed by COMSOL Multiphysics simulation software. It is found that the electric field distribution in the high-voltage DC cable terminal is affected by the interfacial space charge and the space charge distribution in cross-linked polyethylene and nonlinear silicone rubber.When the peak value of the interface space charge is less than 2 C/m~3, the effect of space charge on the electric field distribution in the cable termination is not obvious. When the peak value is greater than 2 C/m~3, the wider the space charge distribution in the insulation layer, the larger the maximum field strength in the cable terminal.
引文
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[2]赵碗君.高压直流输电工程技术[M].北京:中国电力出版社,2004:1-16.ZHAO Wanjun.HVDC technology[M].Beijing,China:China Electric Power Press,2004:1-16.
[3]温家良,吴锐,彭畅,等.直流电网在中国的应用前景分析[J].中国电机工程学报,2012,32(13):7-12.WEN Jialiang,WU Rui,PENG Chang,et al.Analysis of DC grid prospects in China[J].Proceedings of the CSEE,2012,32(13):7-12.
[4]尚康良,曹均正,赵志斌,等.320 kV XLPE高压直流电缆接头附件仿真分析和结构优化设计[J].中国电机工程学报,2016,36(7):2018-2024.SHANG Kangliang,CAO Junzheng,ZHAO Zhibin,et al.Simulation analysis and design optimization of 320 k V HVDC cable joint[J].Proceedings of the CSEE,2016,36(7):2018-2023.
[5]JACOBSON B,DE TOLEDO P F,ASPKLUND G.500 MW city center infeed with voltage source converter based HVDC[C]//40th Meeting of Study Committee B4 and Collokiμm on Role of HVDC,FACTS,and Emerging Technologies in Evolving Power Systems.Bangalore,India:[s.n.],2005:1-10.
[6]HANLEY T L,BURFORD R P,FLEMING R J.A general review of polymeric insulation for use in HVDC cables[J].IEEE Electrical Insulation Magazine,2003,19(1):13-24.
[7]TAKEDA T,HOZΜMI N,SUZUKI H,et al.Space charge behavior in full-size 250 k V DC XLPE cables[J].IEEE Transactions on Power Delivery,1998,13(1):28-39.
[8]陈庆国,秦艳军,尚南强,等.温度对高压直流电缆中间接头内电场分布的影响分析[J].高电压技术,2014,40(9):2619-2626.CHEN Qingguo,QIN Yanjun,SHANG Nanqiang,et al.Influence analysis of temperature on electric-field distribution in HVDC cable joint[J].High Voltage Engineering,2014,40(9):2619-2626.
[9]李长明,孙钦佩,李春阳,等.硅橡胶电导特性对XLPE绝缘高压直流电缆中间接头内电场分布的影响[J].南方电网技术,2015,9(10):47-51.LI Changming,SUN Qinpei,LI Chunyang,et al.Effect of silicone rubber's electric conductance characteristics on electric field distribution inside XLPE insulated HVDC cable joints[J].Southren Power System Technology,2015,9(10):47-51.
[10]夏俊峰,张冶文,郑飞虎,等.聚乙烯空间电荷分布行为的形成机理与仿真力法研究[J].物理学报,2009,58(12):8529-8536.XIA Junfeng,ZHANG Yewen,ZHENG Feihu,et al.Numerical simulation of space charge packet behavior in low-density polyethylene under direct current voltage[J].Acta Physica Sinica,2009,58(12):8529-8536.
[11]高宇,王明行,赵宁,等.固体绝缘材料表面电荷特性的研究进展[J].高电压技术,2018,44(8):2628-2645.GAO Yu,WANG Minghang,ZHAO Ning,et al.Research progress in surface charge characteristics of solid insulating materials[J].High Voltage Engineering,2018,44(8):2628-2645.
[12]屠德民,王霞,吕泽鹏,等.以能带理论诠释直流聚乙烯绝缘中空间电荷的形成和抑制机理[J].物理学报,2012,61(1):1-7.TU Demin,WANG Xia,LüZepeng,et al.Formation and inhibition mechanisms of space charges in direct current polyethylene insulation explained by energy band theory[J].Acta Physica Sinica,2012,61(1):1-7.
[13]王霞,朱有玉,王陈诚,等.空间电荷效应对直流电缆及附件绝缘界面电场分布的影响[J].高电压技术,2015,41(8):2681-2688.WANG Xia,ZHU Youyu,WANG Chencheng,et al.Effect of space charge on electric field distribution at the insulating interface between DC cable and accessory[J].High Voltage Engineering,2015,41(8):2681-2688.
[14]韩宝忠,傅明利,李春阳,等.硅橡胶电导特性对XLPE绝缘高压直流电缆终端电场分布的影响[J].高电压技术,2014,40(9):2627-2634.HAN Baozhong,FU Mingli,LI Chunyang,et al.Effect of silicone rubber's electric conductance characteristic on electric field distribution inside XLPE insulated HVDC cable termination[J].High Voltage Engineering,2014,40(9):2627-2634.
[15]王霞,刘霞,郑明波,等.温度梯度场下硅橡胶/交联聚乙烯界面上空间电荷的形成机理[J].高电压技术,2011,37(10):2424-2430.WANG Xia,LIU Xia,ZHENG Mingbo,et al.Formation mechanism of space charge accumulation at SR and XLPE interface under temperature gradient[J].High Voltage Engineering,2011,37(10):2424-2430.
[16]陈曦,王霞,吴锴,等.温度梯度场对高直流电压下聚乙烯中空间电荷及场强的畸变[J].电工技术学报,2011,26(3):13-19.CHEN Xi,WANG Xia,WU Kai,et al.Space charge accumulation and stress distortion in polyethylene under high DC voltage and temperature gradient[J].Transactions of China Electrotehnical Society,2011,26(3):13-19.
[17]林琼桂.一般波包在均匀场中的运动[J].大学物理,2003,22(2):4-6.LIN Qionggui.General wave packets in a homogeneous field[J].College Physics,2003,22(2):4-6.