Design Improvements on Graded Insulation of Power Transformers Using Transient Electric Field Analysis and Visualization Technique
نویسندگان
چکیده
| This paper deals with design improvements on graded insulation of power transformers using transient electric eld analysis and a visualization technique. The calculation method for transient electric eld analysis inside a power transformer impressed with impulse voltage is presented: Initially, the concentrated electric network for the power transformer is constructed by dividing transformer windings into several blocks and by computing the electric circuit parameters. Next, the transient electric eld analysis is performed. Using the results of the circuit analysis as boundary conditions, a 2D axisymmetrical electric eld nite element analysis is performed. Finally, an animated display technique for the transient voltage, the electric eld intensity and the tolerance rate of electric eld intensity distributions is proposed as an extremely useful tool for design on graded insulation. A successful application of the proposed method for analysis of a model transformer for which the computed results agree very well with measured results is also presented. Keywords| Power transformer, graded insulation, impulse voltage, transient electric eld analysis, 2D axisymmetrical nite element method, scienti c visualization.
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