Experimental validation of a computer model simulating an impulse voltage distribution in HV transformer windings

A number of computer models have been recently proposed for simulation of the impulse voltage distribution in the winding of power transformers. Some of these models can predict the winding behavior at high frequencies, some other were developed as a practical tool for designers of lower voltage transformers. The time and expenditure put in development of these models should be balanced by a similar effort to check the model validity. Such checks consist of a comparison of the predicted voltages to the actually measured ones. With the advent of high resolution, fast digital recorders and signal processing techniques, this validation can be performed to a much higher accuracy and completeness than the conventional comparison of analog oscillograms to simulated graphs. The paper presents such a validation technique applied to a computer model of a transformer winding