The effect of geomagnetically induced currents on the thermal conditions of power transformers

Vakhnina, Vera V.; Кузнецов, В. Н.; Шаповалов, В. А.

doi:10.3103/s1068371216010119

Cited by 10 publications

(3 citation statements)

References 2 publications

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“…[14], a converter transformer is designed to study the voltage harmonics with the help of three‐dimensional (3D) FEM. Many authors have tried to study magnetising current waveform [15], magnetic saturation [16], losses and temperature rise [17] for various types of transformers. An Epstein frame‐like core model was studied for power transformer by harmonic balance FEM [18].…”

Section: Introductionmentioning

confidence: 99%

Modelling of magnetostrictive vibration and acoustics in converter transformer

Yadav

Mehta

2021

IET Electric Power Appl

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The converter transformers are susceptible to more noise and vibration when compared to power transformers due to the presence of DC bias in the DC transmission line. DC bias occurs mostly due to inaccuracies in valve firing resulting in a small residual DC oscillating around zero. Measurement of magnetostriction becomes significant as it influences the vibration and noise from the core. Hence, a magnetostrictive model of a high-voltage DC converter transformer has been developed. This work analyses the vibration and noise acoustics under such an occurrence. First, the core of the transformer model is designed in the stepped configuration for 240 MVA; then, magnetostrictive vibration is analysed by using suitable modules of COMSOL Multiphysics at different magnitudes of DC bias. The physics of noise has been interfaced using the Acoustics Module, and the results are recorded. Finally, artificial neural network model is developed for the prediction of vibration and noise characteristics of the model. The fitting process of neural network was then remodelled using various optimisation techniques, namely teaching-learning-based optimisation, particle swarm optimisation, biogeography-based optimisation, simulated annealing and binary coded genetic algorithm, and their results were compared to obtain the best-suited method using % mean-squared-error evaluation. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Introductionmentioning

confidence: 99%

Modelling of magnetostrictive vibration and acoustics in converter transformer

Yadav

Mehta

2021

IET Electric Power Appl

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“…Thermal effects on transformers caused by GIC have been studied by several authors (see Vakhnina et al. (2016) and references therein).…”

Section: Resultsmentioning

confidence: 99%

“…Hence, we obtained the hull's residual temperature ΔT, which is a proxy for thermal effects in the transformer. Thermal effects on transformers caused by GIC have been studied by several authors (see Vakhnina et al (2016) and references therein).…”

Section: On the Gic Measurementsmentioning

confidence: 99%

Improved Model for GIC Calculation in the Mexican Power Grid

Caraballo,

González‐Esparza,

Pacheco

et al. 2023

Space Weather

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We present the first observations of geomagnetically induced currents (GIC) in the Mexican power grid and an improved model to calculate them. The new model comprises ca. 250 substations working at various voltage levels, a methodology to estimate geomagnetic disturbances (δB) at different points throughout the Mexican territory, and a 1D piecewise model that considers lateral variations in the ground conductivity. This is an improvement of a former uniform conductivity model presented previously to calculate our first GIC estimates (Caraballo et al., 2020). We compared the observed and calculated GIC between August and November 2021 at a coastal 400 kV substation. During this interval, five geomagnetic storms occurred (G1 and G2). The observed GIC exceeded 10 A during the most strong event; this shows a clear grid response even under weak geomagnetic perturbations that occurred during the solar minimum. Further comparison with the results of the former model suggests that the new 1D piecewise model yields better GIC estimates for the Mexican power grid.

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Energy-efficient pumping installations at agricultural production facilities

Platonov¹,

Fedorov²

2019

IOP Conf. Ser.: Earth Environ. Sci.

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The article presents the method of the feasibility study of various methods of regulation on pumping installations of agricultural objects. It was found that the best results are observed in electric drives with frequency converters and valve cascade: here the total losses Qmin mode are only about 10% of the base value, which is explained by minimal losses in pipelines. There is no need to use valves at all. It is shown that with parametric control of the speed of an asynchronous electric drive with a phase-rotor, the loss in hydraulic elements (pump and network) has the same value as with frequency control (about 10% of the base value), but slip losses increase by 12%

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The effect of geomagnetically induced currents on the thermal conditions of power transformers

Cited by 10 publications

References 2 publications

Modelling of magnetostrictive vibration and acoustics in converter transformer

Modelling of magnetostrictive vibration and acoustics in converter transformer

Improved Model for GIC Calculation in the Mexican Power Grid

Energy-efficient pumping installations at agricultural production facilities

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