Vibration and noise numerical calculation of distribution transformer manufactured of B18R065 oriented silicon steel sheet
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).
distribution transformermagnetostrictionthermal stress analogyfinite elementvi-bration and noiseB18R065
万方数据
维普
