12kV开关柜三相母线短路电动力有限元分析

A Finite Element Analysis of Short-Circuit Force on Three-Phase Busbars in 12 kV Switch Cubicle

以ABB 12 k V开关柜三相平行母线排为对象,利用COMSOL 5.0建立母线排有限元分析模型,计算短路稳态与暂态下母线排所受电动力大小,并且绘制出三相母线所受电动力在x-y平面内的分布和随时间变化的规律.将仿真与经典公式计算结果进行对比,验证了该计算模型的有效性.仿真结果表明:各相所受电动力均是交变的,其频率为电流频率的两倍;暂态下,三相母线中B相所受到电动力最大,为6 989.4 N,为A相或C相所受电动力的1.07倍并且暂态分量存在了0.16 s.仿真结果为12 k V开关柜母线结构优化设计和电动稳定性分析提供参考依据.

A model of three phase parallel busbars in 12 k V switch cubicle of ABB making was established by COMSOL finite element simulation software in order to calculate and simulate the results of three-phase busbars under the condition of steady state and transient state. The distribution of electromagnetic force in x-y plane was mapped as well as its pattern of electromagnetic force over time,and the results of the finite element model with those from classical formula method was compared to verify the validity of the calculation model.The simulation results show that electromagnetic force of each phase is alternating and its frequency is twice that of current frequency. The electromagnetic force of B phase is the largest under the condition of transient state and its value is 6 989. 4 N,1. 07 times that of A and C phase. Meanwhile,the transient component existed for 0. 16 second. The calculation model and the analysis results can be helpful for configuration optimal design and short circuit fault monitoring of three phase busbars in 12 k V switch cubicle.