Vibration and noise is the key issue that must be addressed in the design and manufacture process of new-type distribution transformer.The hysteresis loop and the magnetostriction curve of B18R065 silicon steel sheet were tested respectively.The finite element method was employed to ana-lyze the magnetic induction intensity distribution and variation of a distribution transformer in no-load condition.Based on thermal stress analogy,the magnetostriction strain was equivalent to thermal load input of 3D transient mechanical analysis model of distribution transformer.The vibration displace-ment and its time variation process of transformer core and oil tank were calculated.The result was in-troduced as excitation source into the 3D harmonic acoustic model.Acoustic field spatial distribution of the distribution transformer was calculated.A 10 kV three-phase oil-immersed distribution trans-former prototype was designed and manufactured of B18R065 silicon steel sheet.The acoustic field calculation result was verified with noise test experiment in a semi-anechoic room.The result shows that the sound pressure level of the distribution transformer prototype in no-load condition is below 42.0 dB(A).
关键词
配电变压器/磁致伸缩/热应力模拟/有限元/振动与噪声/B18R065
Key words
distribution transformer/magnetostriction/thermal stress analogy/finite element/vi-bration and noise/B18R065
维普
万方数据