A Numerical Analysis of Inrush Current in Three Phase Transformers

Abstract

This paper presents a numerical method for analyzing the electromagnetic transients in three phase transformer circuits, and shows numerical and experimental results of two type three phase circuits. The one circuit consists of the E-type wound core, and the other consists of three C-type wound cores. Both circuits are driven in the star-star connection. Inrush current, induced voltage and neutral voltage of transformers are investigated numerically and experimentally under the condition of zero make on phase.
Observed transients are predicited by numerical simulations using this method, and the results are compared with the experimental results showing satisfactory agreement.