摘要
高功率Tesla变压器在脉冲功率技术领域应用广泛,但其次级线圈处于非均匀电场中,线圈匝间电压分布不均,容易导致匝间绝缘击穿。文中设计了一台双磁心Tesla变压器,利用有限元法建立次级线圈的电场仿真模型,分析其匝间的电场分布情况。针对匝间电压分布不均问题,提出次级线圈首尾两端双线并绕及增加屏蔽环来改善电场分布的措施,使最大场强小于微小油间隙的击穿场强,确保变压器次级线圈的绝缘安全。通过仿真分析发现首尾两端并绕可改善电场分布,但并绕匝数不宜过多。高压端增加屏蔽环后,场强分布更加均匀,最大场强下降62.9%,且最大场强远低于脉冲条件下的油间隙击穿场强,能够满足绝缘设计要求。
High power Tesla transformer is widely used in the area of pulsed power technology,but its secondary coils is in a non-uniform electric field,and the uneven distribution of inter-turn voltage of the coils is likely to lead to inter-turn insulation breakdown.In this paper,a set of dual magnetic core Tesla transformer is designed,an electric field simulation model of the secondary coil is set up by finite element method and the inter-turn electric field distribution is analyzed.Aiming at the problem of uneven distribution of inter-turn voltage,the two ends of the secondary coil are double-wired and a shielding ring is added to improve the electric field distribution so to keep the maximum field strength be less than the breakdown field strength of the tiny oil gap and assure insulation safety of the secondary coil of the transformer.It is found through simulation analysis that the double-wired winding of head and tail terminals can improve electric field distribution,but the number of double-wired turns shall not be too much.After addition of the shielding ring to the high-voltage terminal,the field strength distribution is more uniform,the maximum field strength is reduced by 62.9%,the maximum field strength is much lower than the breakdown field strength of the oil gap under the pulse condition,which can meet the insulation design requirements.
作者
蔡宛辰
金童
沈骏峰
王佳栋
江进波
CAI Wanchen;JIN Tong;SHEN Junfeng;WANG Jiadong;JIANG Jinbo(College of Electricity and New Energy,China Three Gorges University,Hubei Yichang 443002,China;State Grid Taizhou Power Supply Company,Zhejiang Taizhou 318000,China;State Grid Quzhou Power Supply Company,Zhejiang Quzhou 324000,China;Hubei Provincial Engineering Technology Research Center for Power Transmission Line,China Three Gorges University,Hubei Yichang 443002,China)
出处
《高压电器》
CAS
CSCD
北大核心
2024年第5期84-91,共8页
High Voltage Apparatus
基金
国家自然科学基金青年基金(51707105)
强脉冲辐射环境模拟与效应国家重点实验室开放基金(SKLIPR2008)。
关键词
高功率Tesla变压器
电场分布
双线并绕
屏蔽环
绝缘设计
high power Tesla transformer
electric field distribution
double-wire parallel winding
shield ring
insulation design
