地铁辅助变流器用变压器电磁振动计算与减振分析

针对某地铁辅助变流器用变压器振动问题,进行了变压器模态测试及振动测试,基于试验条件与模型修正方法,建立了变压器电磁场、电磁激振力、振动响应的多物理场耦合分析流程,计算分析了变压器因磁致伸缩产生的电磁力及其电磁振动特性。结果表明:考虑实际电流源三相不对称谐波电流时,铁心磁通密度含有较丰富的3、5、7、9、11次谐波分量,该谐波分量导致铁心产生较大谐波振动。在此基础上提出变压器减振方案,经过仿真计算验证了所提方案的合理性,具有一定工程应用价值。

Calculation and vibration reduction for electromagnetic vibration of a voltage transformer used in metro auxiliary converter

Aiming at vibration problems of a voltage transformer used in metro auxiliary converter,its modal and vibration measurements were conducted.Based on test conditions and the model updating method,a multi-physical field coupled analysis model including electromagnetic field,electromagnetic excitation and vibration response of the transformer was established.The transformer’s electromagnetic force produced due to magneto-striction and its electromagnetic vibration characteristics were calculated and analyzed.The results showed that considering 3-phase asymmetric harmonic current of the actual current source,the magnetic flux density of the iron core contains richer 3,5,7,9 and 11 order harmonic components to cause a stronger harmonic vibration of the iron core.Furthermore,the transformer vibration reduction scheme was proposed.Finally,the simulation calculation verified the rationality of the proposed method.It was shown that the proposed method has a certain engineering application value.