The Influence of Geomagnetic Storms on Thermal Processes in the Tank of a Power Transformer

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

doi:10.1109/tpwrd.2014.2386276

Cited by 16 publications

(7 citation statements)

References 3 publications

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“…Процесс насыщения вызывает изменение картины распределения магнитных потоков по элементам магнитной системы силового трансформатора, следствием которого является увеличение потоков рассеяния и токов намагничивания. Последний приобретает однополярный характер и служит источником интенсивных высших гармоник тока [6].…”

Section: / 63 and Tdts-400000/242/20 The Dependences Of The Mean Vaunclassified

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Simulation of One-Sided Saturation of Magnetic Systems of Electric Power Systems Power Transformers

Vakhnina

Kuvshinov

Кузнецов

et al. 2018

UCA

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A technique for modeling the magnetic fi elds of power transformers in the environment of the software product FEMM 4.2 is developed taking into account the design scheme and real geometric dimensions of the magnetic system and tank, quasi-permanent current components in high-voltage windings, and the experimental magnetization characteristics of electrical and structural steel. Modeling of magnetic fi elds of magnetic systems of rod and armored rod structures is carried out on the example of serial power transformers TRDN- 63000/115 / 6.3 / 6.3 and TDTs-400000/242/20. The dependences of the mean values of induction in the central cross sections of the rods and side yokes on the quasi-constant currents are determined. It is shown that the saturation of the magnetic system of the rod structure begins with the outer rods at a multiplicity of quasi-constant current equal to 2.2 relative to the nominal phase current of the high-voltage winding. The saturation of the magnetic system of the armored rod structure begins with the lateral yokes at a multiplicity of the quasi-constant current equal to 2.63 with respect to the idle current rating.

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Section: / 63 and Tdts-400000/242/20 The Dependences Of The Mean Vaunclassified

“…то условие Неймана будет выполняться на окружности радиуса r 0 (μ d(S) = 1) , если положить константы c 0 , c 1 равными(6) …”

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Simulation of One-Sided Saturation of Magnetic Systems of Electric Power Systems Power Transformers

Vakhnina

Kuvshinov

Кузнецов

et al. 2018

UCA

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“…The DC bias result in abnormal vibration, noise, harmonics, reactive power loss and temperature rise [7]. As for the influence of geomagnetic storms, in addition to the blackout [8], there have been a large number accidents where transformers were severely damaged due to the temperature rise [9][10][11]. In reference [9], where the accident on March 13, 1989 has been introduced, geomagnetic storms encroached New Jersey Salem nuclear power plant and caused damage to the 500kV/1200MVA transformer.…”

Section: Introductionmentioning

confidence: 99%

“…The accident caused by the GIC in South African Power Grid destroyed several 400 kV transformers during the geomagnetic storms in October to November, 2003 [10]. In reference [11], the tank model of the transformer leakage flux distribution and the temperature rise was established, and the values of leakage flux and temperature rise were calculated. The previous researches on the transformer temperature rise due to GIC are very limited for the probable reasons that the GIC does not exist in all countries and the transformer designing is related to commercial secrets.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Single-phase Shell & Core Type Transformers in GIC Temperature Rise Effect

Zhai¹,

Zhu²,

Gu³

et al. 2018

dteees

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Abstract. Geomagnetically induced currents (GICs) flowing through transformers may cause temperature rise which could result in permanent damage. As the single-phase-set transformers are widely used in the bulk power transmission, this paper investigates the temperature rise effect both in shell type transformers and core type transformers. Based on the designing parameters of the 500kV single-phase shell type and core type transformer, a 3D finite element model including the transformer iron core, tank and supporting parts has been established, so that the temperature rises in the iron cores and supporting parts are all taken into account. Through calculation with different values of GIC excitations, the different temperature rise characteristics between shell transformer and core transformer are investigated. The simulation results of the temperature rise at different positions in the supporting parts can provide references for the designing of Chinese UHV (ultrahigh voltage) transformers to mitigate the temperature rise due to DC bias.

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“…This also causes a corresponding increase in temperatures. Some very recent papers have focused on the heating of the various parties of the transformer [4,10,11]. When unipolar half-wave saturation of the transformer core occurs, a larger portion of the flux no longer passes through the core, which has the effect of creating additional eddy currents on the transformer core clamping bolts, the winding, the tie plates and the tank walls.…”

Section: Introductionmentioning

confidence: 99%

Effect of the GICs on magnetic saturation of asymmetric three‐phase transformer

Aboura

Touhami

2017

IET Electric Power Applications

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The most commonly used models in geomagnetic-induced currents (GICs) studies neglect the hysteresis phenomenon. In relation to this, the authors present an approach to integrate the hysteresis phenomenon to the finiteelement model (2D-FEM) for the effects of the GIC which considers the current, as an input quantity. These currents are obtained by a dynamic electromagnetic model that the authors developed, and are compared with the results obtained by experimentation. This is the first time that this phenomenon has been shown in three-phase transformers with load. They also provide other practical responses in relation to other papers in which their studies concern the imbalance GIC bias on the asymmetric three-phase transformers with no-load while the majority of the transformers operate on load.

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The Influence of Geomagnetic Storms on Thermal Processes in the Tank of a Power Transformer

Cited by 16 publications

References 3 publications

Simulation of One-Sided Saturation of Magnetic Systems of Electric Power Systems Power Transformers

Simulation of One-Sided Saturation of Magnetic Systems of Electric Power Systems Power Transformers

Comparative Study of Single-phase Shell & Core Type Transformers in GIC Temperature Rise Effect

Effect of the GICs on magnetic saturation of asymmetric three‐phase transformer

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