Digital simulator of transformer windings subject to impulse voltage

Abstract

A digital simulator of transformer windings, which allows the computation of the transient responses to any input waveforms, is presented. Transformer windings showing a very irregular response with numerous resonant peaks are considered. The structure of the proposed simulator includes a transversal digital filter that uses the winding impulse response. This response is obtained analytically by means of an efficient algorithm requiring the knowledge of the frequency gain function which can be easily measured by means of instrumentation of high accuracy and low cost. The proposed algorithm includes a procedure for the computation of the phase response from the amplitude one. The design of the winding digital simulator of a 300 kVA transformer is carried out. The computed voltage pulse responses are in closer agreement with the measured ones.