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The heating and cooling is very complex process for winding in large power transformer, which involves fluid dynamic, manufacture technology and numerical heat transfer and other related disciplines. Recently, the electromagnetic-Fluid-thermal coupled method and thermal network method are widely used by domestic and foreign researchers, whereas the oil flow distribution can not be taken into account...
Based on 500kV power transformer, according to the mass-spring system model for the axial vibration of power transformer winding and its nonlinear characteristics, a calculation model is simplified, the modal simulation system of power transformer active part, which composes of core, windings, tensile plates and clamp frames is established, the natural frequencies and vibration modal in different...
As the power transformer has been to the direction of high voltage and large capacity. Therefore, the calculation of major insulation and longitudinal insulation has been played a more and more important role in transformer design. Use the simplified equivalent circuit as the calculated model. The calculation software for wave process of power transformer winding is developed with Matlab language...
A power transformer operating in electric network is supplied by voltage source. When analyzing short-circuit currents and forces of the three-phase power transformer applied to windings during its short-circuit procedure, the field-circuit coupled method is needed.
In this paper the discussions on the axial vibrations modal of power transformer windings under different levels of pre-compression through experiment and computation are presented. The axial vibrations modal of windings was investigated on the transformer model of windings both analytically and calculatedly, this proves that the changes of pre-compression on the windings have effects on their natural...
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