Electromagnetic analysis of single-phase transformer banks under sympathetic inrush phenomenon

Lima, Diorge de Souza; Mahmud, Lucas Sousa; Sousa, Antonio Roniel Marques de; Fonseca, Wellington da Silva; Bezerra, Ubiratan Holanda; Bezerra, Fábio Vinícius Vieira

doi:10.3233/jae-190041

Cited by 6 publications

(1 citation statement)

References 16 publications

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“…Coupling methodologies also involve the interaction between different numerical methods in order to consolidate the results even more precisely, such as the coupling shown in Lima et al [21], where the trapezoidal method coupled to the FEM was used to analyze the phenomenon of solidary energization in a three-phase bank formed by three single-phase transformers.…”

Section: Introductionmentioning

confidence: 99%

Magneto-Thermo-Structural Analysis of Power Transformers under Inrush and Short Circuit Conditions

et al. 2021

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The main equipment responsible for connection and transmission of electric power from generating centers to consumers are power transformers. This type of equipment is subject to various types of faults that can affect its components, in some cases also compromising its operation and, consequently, the electric power supply. Thus, in this paper, electromagnetic, thermal, and structural analysis of power transformers was carried out with the objective of providing the operator with information on the ideal moment for performing predictive maintenance, avoiding unplanned shutdowns. For this, computational simulations were performed using the finite element method (FEM) and, from that, the different transformer operation ways, nominal currents, inrush current, and short-circuit current were analyzed. In this perspective, analyses of the effects that thermal expansion, axial forces, and radial forces exerted were carried out, contributing to possible defects in this type of equipment. As a study object, simulations were carried out on a 50 MVA single-phase transformer. It is important to emphasize that the simulations were validated with real data of measurements and with results presented in the current literature.

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Section: Introductionmentioning

confidence: 99%

Magneto-Thermo-Structural Analysis of Power Transformers under Inrush and Short Circuit Conditions

et al. 2021

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Transient-steady state vibration characteristics and influencing factors under no-load closing conditions of converter transformers

Jiang,

Zhang,

Dong

et al. 2024

International Journal of Electrical Power & Energy Systems

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A Sympathetic Inrush Identification Method Using Substation-Area Currents

Peng

Zhang²,

Li³

et al. 2021

J. Phys.: Conf. Ser.

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Transformers in power system usually take current differential protection as the main protection, but the protection is easy to be affected by inrush currents and then maloperates. Sympathetic inrush is one kind of inrush currents, which is caused by energization of an adjacent transformer. There were many transformer differential protection maloperation cases caused by sympathetic inrush in the field, while the conventional second harmonic restraint method did not work effectively. In this paper, a method based on substation-area currents and curve fitting is proposed to identify sympathetic inrush. The method is presented using the characteristic that sympathetic inrush and initial inrush alternatively appear in reverse polarities. The characteristic exists continuously during sympathetic inrush. In order to verify effectiveness of the proposed method, PSCAD/EMTDC software is used in this paper to build sympathetic inrush model and obtain simulation data. Simulation results prove that the proposed method can effectively identify sympathetic inrush.

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Electromagnetic analysis of single-phase transformer banks under sympathetic inrush phenomenon

Cited by 6 publications

References 16 publications

Magneto-Thermo-Structural Analysis of Power Transformers under Inrush and Short Circuit Conditions

Magneto-Thermo-Structural Analysis of Power Transformers under Inrush and Short Circuit Conditions

Transient-steady state vibration characteristics and influencing factors under no-load closing conditions of converter transformers

A Sympathetic Inrush Identification Method Using Substation-Area Currents

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