Short-circuit Impedance Calculation of 25 MVA Autotransformer with Tertiary Winding using FEM

Jimenez-Mondragon, V. M.; Carrazana, Victor Julian Fernandez; Olivares-Galván, J. C.; Ocón, Rodrigo Valdés

doi:10.1109/tla.2023.10068838

Cited by 2 publications

(1 citation statement)

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“…according to the load losses (P ccN ) and secondary current (I sN ) nominal values, determined after performing a short-circuit test at the industrial frequency (50-60 Hz) [33][34][35][36] or, by any of the procedures described in references [37][38][39][40][41][42][43][44]. The nominal short-circuit resistance (R ccN ) defined by Equation ( 2) is a parameter independent of the frequency of the winding current harmonics and has the same values in each phase of the three-phase transformers.…”

Section: Introductionmentioning

confidence: 99%

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

León-Martínez,

Peñalvo-López,

Sáiz-Jiménez

et al. 2024

Applied Sciences

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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 However, the traditional concept of short-circuit resistance, independent of the harmonic frequencies, has been superseded by present transformer standards.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 (Rcc,z), of each harmonic (Rcc,h), and the non-fundamental frequency combined harmonics (Rcc,Hz). Likewise, the harmonic loss factor (HLFz%) 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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