10 kV浇注支柱式电流互感器电场有限元分析及结构优化设计
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摘要
浇注支柱式电流互感器是电力系统中用于测量、控制和保护的重要设备.以LZZBJ9-10B型浇注支柱式电流互感器为例,通过ANSOFT Maxwell软件对互感器内部进行三维电场仿真分析.研究结果表明,互感器内部电场集中分布区域在一次绕组的4个端角和二次绕组的左右两端,对一、二次绕组电场进行局部二维分析,得到绕组电场强度最大值和最小值的分布点的位置,提出通过改变绝缘挡板的厚度避免主绝缘材料因电场分布不均匀而发生局部放电的有效措施,并运用ANSOFT Maxwell软件进行电场分析得到验证.研究结果为10 kV浇注支柱式电流互感器的结构优化设计和安全运行提供了依据.
Cast pillar current transformers are important devices for measurement, control and protection in power systems. In this paper, the LZZBJ9-10 B type cast-type current transformer is taken as an example, and three-dimensional electric field simulation analysis of its interior is carried out by the ANSOFT Maxwell software. The results show that the electric field concentrated distribution areas of the transformer are at the four end angles of the primary winding and the left and right ends of the secondary winding. The electric fields of the primary and the left secondary windings are subjected to local two-dimensional analysis to obtain the position of the distribution point of the maximum and minimum electric field strength of the windings. The authors propose that the thickness of the insulating baffle be changed to avoid partial discharge of the main insulating material resulting from uneven electric field distribution in it, and this proposal is verified by electric field analysis using the ANSOFT Maxwell software. The research results provide a basis for the structural optimization design and safe operation of the 10 kV cast pillar current transformer.
Cast pillar current transformers are important devices for measurement, control and protection in power systems. In this paper, the LZZBJ9-10 B type cast-type current transformer is taken as an example, and three-dimensional electric field simulation analysis of its interior is carried out by the ANSOFT Maxwell software. The results show that the electric field concentrated distribution areas of the transformer are at the four end angles of the primary winding and the left and right ends of the secondary winding. The electric fields of the primary and the left secondary windings are subjected to local two-dimensional analysis to obtain the position of the distribution point of the maximum and minimum electric field strength of the windings. The authors propose that the thickness of the insulating baffle be changed to avoid partial discharge of the main insulating material resulting from uneven electric field distribution in it, and this proposal is verified by electric field analysis using the ANSOFT Maxwell software. The research results provide a basis for the structural optimization design and safe operation of the 10 kV cast pillar current transformer.
引文
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[11]王佳颖,方春恩,戴玉松,等.35kV触头盒电场计算及优化设计[J].高电压技术,2007,33(12):63-65.
[12]NAJAFI A,ISKENDER I.Electromagnetic Force Investigation on Distribution Transformer Under Unbalanced Faults Based on Time Stepping Finite Element Methods[J].International Journal of Electrical Power&Energy Systems,2016,76:147-155.
[13]王荣秀,王波.经典电偶极子在交变电场下的运动[J].重庆理工大学学报(自然科学版),2018,32(2):207-212.
[14]李随朝,赵昱,李素洁,等.100kA大电流互感器现场校验方法的研究[J].高压电器,2016,52(7):161-167.
[15]王辉.基于Ansys的252kV GIS用三相共箱式电流互感器研发[J].高压电器,2016,52(7):168-171.
[2]阎秀恪,孙阳,于存湛,等.油浸倒立式电流互感器主绝缘电场分析与优化设计[J].电工技术学报,2014,29(1):37-43.
[3]何大猛,晏年平,王仲奕,等.500kV SF6电流互感器内部盆式绝缘子缺陷电场分析和实验研究[J].中国电力,2014,47(8):27-32.
[4]何计谋,蒲路,祝嘉喜.126kV复合套管SF6电流互感器绝缘结构设计[J].高压电器,2006,42(1):42-43.
[5]熊君,胡国辉,全小康,等.基于Ansoft Maxwell仿真分析的永磁应用磁路优化设计例析[J].磁性材料及器件,2018,49(6):28-33.
[6]VRANCKEN M,SCHOLS Y,AERTS W,et al.Benchmark of Full Maxwell 3-Dimensional Electromagnetic Field Solvers on Prototype Cavity-Backed Aperture Antenna[J].AEU-International Journal of Electronics and Communications,2007,61(6):363-369.
[7]杨洪,方春恩,任晓,等.35kV电子式电流互感器的研究[J].高压电器,2011,47(2):12-16.
[8]LE S′NIEWSKA E.Application of 3DField Analysis for Modelling the Electric Field Distribution in Ceramic Insulator of HV Combined Instrument Transformer[J].Journal of Electrostatics,2001,51-52:610-617.
[9]ALLAHBAKHSHI M,AKBARI M.Heat Analysis of the Power Transformer Bushings Using the Finite Element Method[J].Applied Thermal Engineering,2016,100:714-720.
[10]赵姗姗,李红江,杨锋.基于Ansoft的变压器电磁参数计算与分析[J].变压器,2015,52(10):14-18.
[11]王佳颖,方春恩,戴玉松,等.35kV触头盒电场计算及优化设计[J].高电压技术,2007,33(12):63-65.
[12]NAJAFI A,ISKENDER I.Electromagnetic Force Investigation on Distribution Transformer Under Unbalanced Faults Based on Time Stepping Finite Element Methods[J].International Journal of Electrical Power&Energy Systems,2016,76:147-155.
[13]王荣秀,王波.经典电偶极子在交变电场下的运动[J].重庆理工大学学报(自然科学版),2018,32(2):207-212.
[14]李随朝,赵昱,李素洁,等.100kA大电流互感器现场校验方法的研究[J].高压电器,2016,52(7):161-167.
[15]王辉.基于Ansys的252kV GIS用三相共箱式电流互感器研发[J].高压电器,2016,52(7):168-171.