Calculation of Eddy Current Field in the Ascending Flange for the Bushings and Tank Wall of a Large Power Transformer

Ho, S. L.; Li, Y.; Tang, Renyuan; Cheng, Ka Wai Eric; Yang, Shihao

doi:10.1109/tmag.2007.914858

Cited by 15 publications

(5 citation statements)

References 9 publications

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“…In other attempts, Ho et al [47] formulated a numerical method for a 720 MVA/500 kV to calculate the 3D open boundary eddy current fields impinging upon the tank walls. The method applies the preconditioned complex bi-conjugate gradient method to generate mesh, stiffness matrix and the solution via a source program developed in FORTRAN.…”

Section: Stray Loss In Other Structural Partsmentioning

confidence: 99%

Stray Load Loss Valuation in Electrical Transformers: A Review

Thango

Bokoro

2022

Energies

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The electricity production opus in South Africa has transformed over the last few years from predominantly coal power generation to a blend of renewable energy generation. The necessity emerges to ascertain whether electrical transformer design philosophies in local manufacturers are contemporary in reference to customer specifications, under increasing penetration of harmonics and distortion as a result of increasing deployment of decentralized power systems. Accurate computation of transformer stray load loss is imperative in localizing the hotspot regions and design of adequate insulation system and consequently cooling system. This loss must also be met by manufacturers based on the customer specifications to avoid penalties. The review of current scientific works affirms the ongoing interest in utilizing the advancement of computational power for painstaking evaluation and management of stray load loss in electric transformers. This article confers overview research, evolution and application of diverse computer-based tools for analyzing the stray load loss based on over 60 published scientific works. Mathematical formulations that can be practically employed by transformer designers during the design phase under normal and harmonic load current conditions are discussed.

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Section: Stray Loss In Other Structural Partsmentioning

confidence: 99%

Stray Load Loss Valuation in Electrical Transformers: A Review

Thango

Bokoro

2022

Energies

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“…Moreover, the method significantly increases the construction cost, which is not conducive to widespread use. In conventional engineering, the panel is often horizontally slotted to suppress eddy currents and temperatures (Auld and Moulder, 1999; Milagre et al , 2012; Ho et al , 2008). The size of slotted metal structure often comes from engineering experience and lacks theoretical metal, and the metal structure after slotting still has the problems of large loss and high temperature.…”

Section: Introductionmentioning

confidence: 99%

Temperature suppression of metal panel in electromagnetic field

Gong

Wang

Yan

et al. 2020

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Purpose The purpose of this study is to suppress the temperature rise of high voltage wall bushing metal plate. Design/methodology/approach First, the authors built a model of a traditional metal plate and got the magnetic field intensity distribution by FEA tools. Optimized according to the magnetic field intensity distribution, the authors slot the traditional metal plate and embed permanent magnets in the slot. Finally, the authors got the temperature distribution diagrams of the above three cases at different current levels by FEA tools. Findings Slotted metal plate is beneficial to suppress magnetic induction intensity, but the improvement of the magnetic induction intensity uniformity is not obvious. The method of embedding a permanent magnet in a slotted metal plate can optimize the magnitude and uniformity of the magnetic induction intensity in the metal plate. The larger the current passing through the metal plate, the better the temperature suppression effect of the slotted metal plate and the slotted metal plate embedded in the permanent magnet. Originality/value The effect of structural factors, slotting plate and setting permanent magnets on slots on the temperature of supporting plate is studied. The paper proposes two methods, slotting metal panels and embedding permanent magnet metal panels, to solve the problems of eddy current loss and high calorific value of the panel, which is of great significance to the safety of the grid equipment.

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“…Some work has been made in reducing the eddy current loss of tank and clamps of transformers by installing magnetic shunts. In [13], the effectiveness of a magnetic bypass plate near the coil ends for reducing the eddy current loss is studied. The shape of the magnetic bypass plate is slender.…”

Section: Introductionmentioning

confidence: 99%