A novel approach to power loss calculation for power transformers supplying nonlinear loads

Sima, Leilei; Miteva, N.; Dagan, Kfir J.

doi:10.1016/j.epsr.2023.109582

Cited by 7 publications

(13 citation statements)

References 6 publications

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Section: Introductionmentioning

confidence: 99%

“…To avoid the errors that R ccN usually introduces in the calculation of load losses of three-phase transformers, two types of short-circuit resistances were developed in [45,46], based on the expressions of the load losses included in the IEEE Standard C57.110-2018 [6,7], which have been included in Section 1.1. These are the short-circuit resistances of L. Sima et al (R k ) [45] and the effective short-circuit resistances of each phase (R cc,z ) [46], and their expressions are indicated in Section 1.2 of this article. However, the short-circuit resistance of L. Sima et al is inappropriate, since its application determines values of the load losses that are different in each transformer's phases than those obtained from the IEEE Standard C57.110-2018, as was verified in reference [46]; therefore, L. Sima et al's short-circuit resistance is not the object of study of this work.…”

Section: Introductionmentioning

confidence: 99%

“…Short-circuit resistances are the parameters that characterize the transformers' load losses, because its product times the square of the currents determines the value of those losses. L. Sima et al developed, in [45], a short-circuit resistance, referred to as the primary resistance, that determines the transformers' load losses established by IEEE Standard C57.110-2018. The short-circuit resistance of L. Sima et al, referred to as the secondary resistance, is expressed as follows [45]:…”

mentioning

confidence: 99%

“…L. Sima et al developed, in [45], a short-circuit resistance, referred to as the primary resistance, that determines the transformers' load losses established by IEEE Standard C57.110-2018. The short-circuit resistance of L. Sima et al, referred to as the secondary resistance, is expressed as follows [45]:…”

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confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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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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“…In 2023, L. Sima et al [36] established expressions for the short-circuit resistance of three-phase transformers feeding non-linear loads. L. Sima et al worked with a transformer model like the one depicted in Figure 1…”

Section: Introductionmentioning

confidence: 99%

Load Losses and Short-Circuit Resistances of Distribution Transformers According to IEEE Standard C57.110

León-Martínez,

Peñalvo-López,

Andrada-Monrós

et al. 2023

Inventions

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Load losses determine transformers’ efficiency and life, which are limited by overheating and deterioration of their elements. Since these losses can be characterized by short-circuit resistances, in this article, we have developed expressions for the short-circuit resistances of three-phase transformers according to IEEE Standard C57.110. Imposing the condition that these resistances must cause load losses of the transformer, two types of short-circuit resistance have been established: (1) the effective resistance of each phase (Rcc,z) and (2) the effective short-circuit resistance of the transformer (Rcc,ef). The first is closely related to the power loss distribution within the transformer. The second is just a mathematical parameter. Applying these resistances to the 630 kVA oil-immersed distribution transformer of a residential network, we have concluded that both types of resistances determine the total load losses of the transformer. However, only Rcc,z accurately provides the load losses in each phase. Rcc,ef can give rise to errors more significant than 16% in calculating these losses, depending on imbalances in the harmonic currents.

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Parameter estimation in single-phase transformers via the generalized normal distribution optimizer while considering voltage and current measurements

Camelo-Daza,

Betancourt-Alonso,

Montoya

et al. 2024

Results in Engineering

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A novel approach to power loss calculation for power transformers supplying nonlinear loads

Cited by 7 publications

References 6 publications

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

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

Load Losses and Short-Circuit Resistances of Distribution Transformers According to IEEE Standard C57.110

Parameter estimation in single-phase transformers via the generalized normal distribution optimizer while considering voltage and current measurements

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