120 kA脉冲电抗器在振荡放电电路中的电磁场分布优化(英文)  

Optimization of Electromagnetic Field Distribution of 120 kA Pulse Inductor in Oscillation Discharge Circuit

作　　者：李振瀚 李华 鲍晓华[1] 高格[2] LI Zhenhan;LI Hua;BAO Xiaohua;GAO Ge(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,Anhui,China;Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,Anhui,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009 [2]中国科学院合肥物质科学研究院等离子体物理研究所,安徽合肥230031

出　　处：《南方能源建设》2024年第3期23-35,I0002,共14页Southern Energy Construction

基　　金：国家重大科技基础设施建设项目“聚变堆主机关键系统综合研究设施”(2018-000052-73-01-001228)。

摘　　要：[目的]脉冲电抗器是失超保护系统振荡放电回路中的重要组成部分。在振荡放电回路中,利用脉冲电抗器与充电电容器振荡产生高脉冲电流,使流过真空断路器的电流反向以创建人工过零点,完成开关分断。但是在通入120kA电流的工况下,由于受到电磁力的作用,脉冲电抗器下方连接排会发生形变,造成设备损坏,大大降低辅助振荡过零回路的可靠性。因此需要对120 kA脉冲电抗器进行电磁场分析,优化其周围电磁场分布。[方法]首先分析辅助振荡过零电路的换流过程,建立脉冲电抗器三维模型,引入磁场屏蔽百分比的概念。其次,通过使用有限元仿真软件计算了不同材料和形状的屏蔽板对脉冲电抗器电磁场分布的影响。分析了不同材料和形状对屏蔽百分比的影响,计算了不同形状下的涡流损耗。最后在结构模块中计算了不同屏蔽结构下的连接排形变程度。[结果]屏蔽板采用不同材料或结构对连接排受到的磁感应强度和电磁力有影响。[结论]圆形铝屏蔽板对脉冲电抗器电磁场分布的优化效果更好。该方法也为脉冲电抗器的电磁屏蔽设计奠定了基础。[Introduction]Pulse inductor is an important component of the oscillation discharge circuit in the quench protection system.In the oscillating discharge circuit,the pulse inductor and charging capacitor are used to oscillate and generate high pulse currents,causing the current flowing through the vacuum circuit breaker to reverse and create an artificial zero-crossing point,thus completing the switch breaking.However,under the condition of 120 kA current,due to the action of the electromagnetic force,the connecting bar below the pulse inductor will deform,causing equipment damage and greatly reducing the reliability of the auxiliary oscillation zero-crossing circuit.Therefore,it is necessary to conduct electromagnetic field analysis on the 120 kA pulse inductor and optimize the electromagnetic field distribution around it.[Method]Firstly,the commutation process of the auxiliary oscillation zero-crossing circuit was analyzed to establish a three-dimensional model of the pulse inductor,and the concept of magnetic field shielding percentage was calculated by using finite element simulation.Then the influence of different materials and shapes on shielding percentage was analyzed,and eddy current losses under different shapes were calculated.Finally,the deformation degree of the connecting bar under different shielding structures was calculated in the structural module.[Result]The results show that the use of different materials or structures in the shielding plates influences the magnetic induction intensity and electromagnetic force received by the connecting bar.[Conclusion]The circular aluminum shielding plate has a better optimization effect for the electromagnetic field distribution.This method also lays a foundation for the electromagnetic shield design of pulse inductors.

关 键 词：脉冲电抗器 屏蔽板 屏蔽百分比 辅助振荡 失超保护系统 

分 类 号：TL4[核科学技术—核技术及应用] TL62