低压断路器的电场分析与优化设计

Electric Field Analysis and Optimization Design of Low Voltage Circuit Breakers

由于低压断路器中电场分布不均匀,在实际运行中易出现局部放电等问题,甚至引发火灾事故,因此对低压断路器中的电场进行分析和优化设计已成为重要的研究课题。以某光伏电站逆变器直流侧的低压断路器为研究对象,使用有限元软件分析不同电压水平和不同触头间距下的电场分布情况,并对断路器的绝缘薄弱点进行结构优化设计。最后,通过比较优化前后的最大电场强度,证明所提优化结构降低了断路器发生击穿放电的风险。

Due to the uneven distribution of electric fields in low voltage circuit breakers,the partial discharge and even fire accidents are prone to occur during the actual operation.Therefore,the analysis and optimization design of electric fields in circuits breaker have become an important research topic.The low voltage circuit breakers on the DC side of inverters in a certain photovoltaic power station are taken as the research objects.The finite element software is used to analyze the electric field distribution under different voltage levels and different contact gaps.The structural optimization design is conducted on the weak insulation points of the circuit breaker.Finally,by comparing the maximum electric field intensity before and after optimization,it is demonstrated that the proposed optimized structure reduces the possibility of breakdown discharge.