Design Considerations for K-Rated Transformers

B. A. Thango, L. S. Sikhosana, A. F. Nnachi, J. A. Jordaan, A. O. Akumu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

The presence of harmonic currents due to the switching action of inverters has spread the realization of the prospective rapid depletion of the transformer's intended lifetime owing to increased losses and temperature rise. With the prospect of reduced transformer service lifetime under harmonic conditions, there is a growing interest by manufacturers to explore design procedures that enables transformers to operate reliably under harmonic conditions. The current work examines K-rated transformers with regards to harmonic indexes in particularly with respect to K-Factor, Harmonic loss factor (HLF) and Factor K for derating the transformer. The transformer considered in this study has a rated 630kVA. Based on a supplied harmonic current spectrum, a comparative study is carried out to calculate the additional winding Eddy losses using the K-Factor and HLF methods. The study reveals that when delivering this harmonic spectrum, the investigated unit must be de-rated to 86.6% of its nominal power rating.

Original languageEnglish
Title of host publicationInternational Conference on Electrical, Computer, and Energy Technologies, ICECET 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665442312
DOIs
Publication statusPublished - 2021
Externally publishedYes
Event2021 International Conference on Electrical, Computer, and Energy Technologies, ICECET 2021 - Cape Town, South Africa
Duration: 9 Dec 202110 Dec 2021

Publication series

NameInternational Conference on Electrical, Computer, and Energy Technologies, ICECET 2021

Conference

Conference2021 International Conference on Electrical, Computer, and Energy Technologies, ICECET 2021
Country/TerritorySouth Africa
CityCape Town
Period9/12/2110/12/21

Keywords

  • Factor K
  • Harmonic currents
  • Harmonic loss factor (HLF)
  • K-Factor
  • Transformer

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • General Computer Science
  • Energy Engineering and Power Technology

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