40.5 kV真空灭弧室内部电场强度分布的仿真分析

Simulation analysis on interior electric field intensity distribution for 40. 5 kV fast vacuum interrupter

40.5kV/2.5kA/63kA真空灭弧室作为363kV/5kA/63kA快速断路器串联模块的子单元,研究其内部电场强度分布以确保其绝缘性能,对于整套快速断路器装置的安全可靠运行尤为重要。根据实际参数搭建了40.5kV真空灭弧室的基本模型,利用Ansoft有限元计算仿真软件搭建了40.5kV真空灭弧室的仿真模型,进行了电场强度分布的仿真计算,得到了灭弧室中的动触头台阶倒角区域、动触头倒角区域、静触头台阶倒角区域、静触头倒角区域的电场强度最大,最有可能发生击穿的结论。提出了通过改变台阶倒角和触头倒角以改善电场分布进行优化设计的建议,并利用Ansoft仿真软件进行改变台阶倒角值和触头倒角值后的仿真计算,得到了触头台阶处倒角取值2mm、动静触头倒角2mm或3mm的设计较优,只设置1个触头片时触头倒角取值3mm设计较优。

The electric field intensity distribution of a vacuum interrupter with 40. 5 kV/2. 5 k A/63 k A was studied. As a subunit of the series module of the fast circuit breaker of 363 k V/5 k A/63 k A,the electric field intensity distribution of the interrupter was studied to ensure its insulation performance. It was very important for the safe and reliable operation of the whole fast circuit breaker. Firstly,the basic model of 40. 5 kV vacuum interrupter was built according to the actual parameters. Then the simulation model of 40. 5 kV vacuum interrupter was built by using Ansoft finite element simulation software. The electric field intensity distribution was simulated and calculated. The results show that the electric field intensity of the four regions is the largest and the most likely to be broken in the dynamic contact step chamfering area,the dynamic contact chamfering area,the static contact step chamfering area and the static contact chamfering area. At the same time,it is suggested that the electric field distribution can be improved by changing step chamfer and contact chamfer,and then the optimum design can be carried out. Finally,with Ansoft simulation software again,it’s simulated and calculated by changing the chamfer value of the step and the chamfering value of the contact,it is obtained that the design is better if the chamfer value at the contact step is 2 mm,the dynamic and static contact chamfering angles are 2 mm or 3 mm. When only one contact chip is set,the design of chamfering angle is 3 mm better.