Question

various methods of estimating field intensity in a power

transformer​

Answer 1

Explanation:

Knowledge of potential and field distribution in the insulation system of a transformer during transient excitation is vital to its construction [1]. This paper deals with insulation design improvements of power transformers using electric field analysis. The calculation methods for electric field analysis, inside a power transformer impressed with impulse and power frequency voltages, are presented. Initially, a lumped parameter equivalent model is constructed by dividing transformer windings into several blocks and computing the electric circuit parameters of this model. Next, the electric field is determined by employing the results of the transformer transient model circuit analysis as boundary conditions; a 2D axisymmetrical electric field finite element analysis is performed. Finally a successful application of the proposed method for analysis of a model transformer is demonstrated and the computed results verified against measured results for this model