Original scientific paper

REDUCTION OF THE INRUSH CURRENT OF THREE-PHASE POWER TRANSFORMERS

Goran Petrović orcid.org/0000-0001-5553-151X ; Sveučilište u Splitu, Split, Hrvatska
Tomislav Kilić orcid.org/0000-0002-2778-7873 ; Sveučilište u Splitu, Split, Hrvatska
Ozren Bego ; Sveučilište u Splitu, Split, Hrvatska

Abstract

Inrush currents that occur during the energization of a three-phase power transformer can reach very high values and cause many problems in an electrical power system. A mathematical model of a transformer has been developed for the investigation of this problem, taking into account the effects of saturation, hysteresis and remanent magnetic flux. An algorithm has been described for the determination of the optimal instant of energization, with the goal of reducing inrush currents. As a method for measuring remanent magnetic flux, integration of the secondary voltage during the previous de-energization is proposed. A circuit model has been prepared of a system for the controlled energization of a three-phase transformer in which the simulation results are confirmed by measurement.

Keywords

hysteresis loop; inrush current; remanent magnetism; transformer

Hrčak ID:

28986

URI

https://hrcak.srce.hr/28986

Publication date:

30.6.2008.

Article data in other languages: croatian

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