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Journal of Energy : Energija, Vol. 59 No. 1-4, 2010.

Original scientific paper

Power Quality Problems Due to Transformer Inrush Current

A. Tokić orcid id orcid.org/0000-0001-8430-8253 ; Faculty of Electrical Engineering, Tuzla Bosnia and Herzegovina
I. Uglešić ; Faculty of Electrical Engineering and Computing, Zagreb Croatia

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Abstract

Transformer energization can produce a large nonsinuoidal inrush current which contains
both odd and higher order harmonic components that can put transformer winding under
mechanical stress. Additionally, they can cause irregular tripping of harmonic protection
relays. Furthermore, in relatively weak power systems, such as is the Bosnian system, the
superposition of harmonic components with system resonance frequencies may produce
temporary overvoltages (TOV). Transformer winding failures and metal oxide surge arrester
(MOA) energy stresses can occur due to TOV. The paper demonstrates a case study of an
energization of a 220/110 kV transformer and power quality problems that can appear due to
higher harmonics. Energy stresses of MOA provoked by transformer energization are
considered in the paper.

Keywords

Power quality; transformer; inrush current; temporary overvoltage; surge arrester

Hrčak ID:

198381

URI

https://hrcak.srce.hr/198381

Publication date:

19.6.2017.

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