Implementation of power transformer controlled switching algorithm

Abstract

Purpose

The paper presents two new algorithms of controlled switching the power transformer. The purpose of this paper is to obtain formulas that determine the moments of closing of the circuit breaker poles. The study contains projects of control systems for both algorithms.

Design/methodology/approach

Mathematical formulas for the time instants of the breaker poles closing were developed on the basis of electric circuit theory and magnetic circuit theory. The presented systems were simulated using a model created in the Alternative Transients Program/Electromagnetic Transients Program software.

Findings

Numerical simulations have proved that the shown systems properly perform the controlled switching carried out in accordance with the proposed algorithms. The times of the poles closing were correctly determined and the inrush currents were reduced to a level of the current of unloaded transformer.

Originality/value

The results achieved are better than those shown in the literature. The solutions presented in the literature provide a reduction of inrush current to a value comparable to the rated current of the transformer, which is ten times greater than the no-load current. Additional achievement of the work is the development of analytical formulas that determine the times of the breaker poles closing.

Citation

Horiszny, J. (2016), "Implementation of power transformer controlled switching algorithm", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 35 No. 4, pp. 1418-1427. https://doi.org/10.1108/COMPEL-01-2016-0007