屏蔽金具对混合式直流断路器多断口串联机械开关电压分配的影响与优化  

Influence and Optimization of Shielding Fitting on Voltage Distribution of Series Multi-break Mechanical Switch of Hybrid Circuit Breaker

作　　者：王华清 黄道春[1] 双明镜 李慧鹏 陈鑫[1] 邱逸群 WANG Huaqing;HUANG Daochun;SHUANG Mingjing;Li Huipeng;CHEN Xin;QIU Yiqun(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电气与自动化学院,湖北武汉430072

出　　处：《湖南电力》2022年第4期1-6,12,共7页Hunan Electric Power

基　　金：国家重点研发计划项目(2017YFB0902400)。

摘　　要：为研究屏蔽金具对混合式直流断路器多断口串联机械开关电压分配的影响,为混合式高压直流断路器多断口串联快速机械开关的均压设计提供支撑,建立典型±200 kV混合式直流断路器模型,采用静电场仿真对电力电子模块、能量吸收模块和屏蔽金具对快速机械开关断口间电压分配特性的影响进行分析,得到了屏蔽金具的结构参数与布置方式对断口电压分配特性的影响规律。研究结果表明,屏蔽金具对断口间电压分配的影响最大,顶层屏蔽罩采用全封闭结构、降低顶层屏蔽罩与快速机械开关单元之间的距离等方法能够有效改善断口间的电压分布。基于仿真结果,从均压设计角度对±200 kV混合式直流断路器的屏蔽金具结构参数与布置方式进行了优化,优化后的高压侧断口承担电压比例从59.97%降低至52.32%,表明了优化措施的有效性。研究结果可为混合式直流断路器用多断口串联机械开关的均压方案设计提供参考。In order to study the influence of shielding fitting on the voltage distribution of series multi-break mechanical switch of hybrid DC circuit breaker, and provide support for the voltage sharing design of fast series multi-break mechanical switch of hybrid HVDC circuit breaker, a typical ±200 kV hybrid DC circuit breaker model is established in this paper. The influence of the power electronic module, the energy absorption module and the shielding fitting on the voltage distribution characteristics of the break of the fast mechanical switch is analyzed by using the electrostatic field simulation, especially the influence of the structural parameters and arrangement of the shielding fitting on the voltage distribution characteristics of the break. The results show that the shielding fitting has the greatest influence on the voltage distribution between the breaks, the voltage distribution between the breaks can be effectively improved by means of the completely enclosed structure of the top layer shield, and reduce the distance between the top layer shield and the fast mechanical switching unit. Based on the simulation results, the structure parameters and arrangement mode of ±200 kV hybrid shielding DC circuit breaker fitting are optimized, the optimized voltage percentage of the high voltage side break decreases from 59.97% to 52.32% and it shows the effectiveness of the optimization measures. The results of this paper can provide a reference for the design of voltage sharing design of series multi-break mechanical switches for hybrid DC circuit breakers.

关 键 词：混合式直流断路器 多断口串联机械开关 均压设计 结构优化 屏蔽金具 

分 类 号：TM561[电气工程—电器]