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The widely developed and used HVDC transmission systems will cause DC bias phenomenon occurred in some electromagnetic facilities of power grids with the results of several negative effects on the secure and reliable operation, including vibrations and noises. However, there has been few studies regarding the influence DC bias has on shunt reactors. To fully explore the vibration characteristic of...
In order to further investigate the vibration performance of power transformer for the detection of winding deformation based on the vibration frequency response analysis (VFRA) method, the electro dynamic forces of the winding of power transformer are calculated first by virtue of the field-circuit coupled finite element method. Then the axial vibration model of the winding is built and the harmonic...
In the paper, a variable frequency constant current power supply is developed to provide the variable frequency current to vibrate the power transformer. A proportional resonant controller is applied to control the current constant. The designed experiment of vibration frequency response analysis for the 220kV transformer is made to validate the effective of the power supply. Experimental results...
In order to further recognize the relationship between the fault of winding deformation of power transformer with the measured tank vibration, the short-circuit test is done in a 220kV transformer. The vibration sweep frequency response curves for some pre-setting winding deformation fault are obtained by virtue of the vibration measurement system. Correlation coefficient is defined and calculated...
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