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- Title
Revisited Concept of Three-Phase Transformers' Short-Circuit Resistances in Light of the Institute of Electric and Electronics Engineers (IEEE) Standard C57.110-2018.
- Authors
León-Martínez, Vicente; Peñalvo-López, Elisa; Sáiz-Jiménez, Juan Ángel; León-Vinet, Amparo
- Abstract
Short-circuit resistances are transformer parameters that characterize the electrical load losses and correct operation of these machines. However, the traditional concept of short-circuit resistance, independent of the harmonic frequencies, has been superseded by present transformer standards. Hence, new expressions for short-circuit resistances of three-phase transformers have been developed in this article based on the IEEE Standard C57.110-2018 and are presented jointly with the losses that these resistances characterize. These refer to the secondary effective short-circuit resistance of each phase ( R c c , z ), of each harmonic ( R c c , h ), and the non-fundamental frequency combined harmonics ( R c c , H z ). Likewise, the harmonic loss factor ( H L F z % ) has been established to determine the importance of the harmonics in each phase's load losses. The application of these short-circuit resistances to the calculation of the load losses for a 630 kVA transformer from an actual residential distribution network has shown that the same values are obtained as with the IEEE Standard C57.110-2018, and they are 48.75% higher than those recorded with the traditional short-circuit resistances when the current distortion rates are 36.47%.
- Subjects
ELECTRONICS engineers; ELECTRIC lighting; ELECTRICAL load
- Publication
Applied Sciences (2076-3417), 2024, Vol 14, Issue 7, p3126
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app14073126