Inicio  /  Applied Sciences  /  Vol: 14 Par: 7 (2024)  /  Artículo
ARTÍCULO
TITULO

Revisited Concept of Three-Phase Transformers? Short-Circuit Resistances in Light of the Institute of Electric and Electronics Engineers (IEEE) Standard C57.110-2018

Vicente León-Martínez    
Elisa Peñalvo-López    
Juan Ángel Sáiz-Jiménez and Amparo León-Vinet    

Resumen

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 However, the traditional concept of short-circuit resistance, independent of the harmonic frequencies, has been superseded by present transformer standards.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 (??????,h 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%.

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