The Impact of Off-Plane Flux on Losses and Magnetostriction of Transformer Core Steel

Shilyashki, Georgi; Pfützner, Helmut; Hamberger, P.; Aigner, Martin; Hofbauer, Franz; Matkovic, Ivo; Kenov, Anton

doi:10.1109/tmag.2014.2324017

Cited by 18 publications

(8 citation statements)

References 7 publications

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“…Furthermore, distinct off-plane fluxes exist, especially in the overlaps of corners and T-joints, as measured recently by an ultra-thin sensor [11]. The off-plane induction shows strong variations in the individual packages, and they tend to cause strong increases of magnetostriction [12]. The arguments mentioned above indicate in clear ways that the strain in the core interior differs from the strain on the surface.…”

Section: Introductionmentioning

confidence: 76%

Printed detector bands for measurements of strain in core interior of transformers

Shilyashki

Pfützner

Windischhofer

et al. 2018

Journal of Electrical Engineering

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In the recent years, the reducing of audible noise of laminated machine cores has become great importance, due to high relevance given to environmental awareness. The strain caused by magnetostriction and magnetostatic forces is recognized as one of the main sources of noise. Especially for transformers, strain in the core interior tends to be different from that on the surface, due to differences of clamping, variation of in-plane fluxes and pronounced off-plane (normal) fluxes. For the first time, local measurements of strain in the core interior are presented by means of a novel printed detector band. First results tend to be very promising, exhibiting very high sensitivity and resolution. So far, the relevance of measurements is restricted to comparisons of different core regions.

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Section: Introductionmentioning

confidence: 76%

Printed detector bands for measurements of strain in core interior of transformers

Shilyashki

Pfützner

Windischhofer

et al. 2018

Journal of Electrical Engineering

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“…The diameter of the core must be optimized during designing of transformer core, considering both the aspects. As approximate rough rule, increase 1% of B causes increase a 2% of the losses [18]. It is appearing clearly from this short introduction in above, the flux density (B) play the essential factor for the losses in transformer.…”

Section: Current Core Joints Designs In Transformersmentioning

confidence: 91%

A Novel Method to Enhance the Core Design of Power Transformers Using Particle Swarm Optimization (PSO) Technique

Alyozbaky

Kadir

Izadi

2019

International Journal of Simulation: Systems, Science &Amp; Technology

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The reduction of losses in a power transformer is a significant topic in a power transmission grids, with the design of the core being one of the important factors related to the losses. In this study, an intelligent algorithm is developed using Particle Swarm Optimization (PSO) technique to find the optimum core design. Using a smart algorithm we consider a novel method to reduce the losses. To achieve this target, a nonlinear B-H curve with a 3D Finite-Element Method (FEM) is used to simulate the proposed model of core coupling with the PSO technique. Steady state analysis is considered in the simulation and the losses of the core and windings were considered a heat source inside the transformer. The results show core losses are reduced by 11 % and 5 % was achieved by the proposed model compared with the 90° butt-lap and 45° mitred designs respectively. The results were validated against the manufacturer's experimental measurements. Our proposed optimization techniques can be used to improve performance of electrical power transformers and can be applied to various transformers of different sizes and power rating.

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“…In the case of large power transformers, magnetic core is made of sheet steel, which creates a complex threedimensional system consisting of a ferromagnetic material since the largest part of magnetic flux concentrates there [5]. This causes elastic deformations and vibrations of the magnetic core that have a sinusoidal form since the externally caused magnetic field is also sinusoidal.…”

Section: Magnetostriction In Magnetic Corementioning

confidence: 99%

Modelling of magnetostriction of transformer magnetic core for vibration analysis

Marks

Vītoliņa

2017

Open Physics

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Magnetostriction is a phenomenon occurring in transformer core in normal operation mode. Yet in time, it can cause the delamination of magnetic core resulting in higher level of vibrations that are measured on the surface of transformer tank during diagnostic tests. The aim of this paper is to create a model for evaluating elastic deformations in magnetic core that can be used for power transformers with intensive vibrations in order to eliminate magnetostriction as a their cause. Description of the developed model in Matlab and COMSOL software is provided including restrictions concerning geometry and properties of materials, and the results of performed research on magnetic core anisotropy are provided. As a case study modelling of magnetostriction for 5-legged 200 MVA power transformer with the rated voltage of 13.8/137kV is conducted, based on which comparative analysis of vibration levels and elastic deformations is performed.

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The Impact of Off-Plane Flux on Losses and Magnetostriction of Transformer Core Steel

Cited by 18 publications

References 7 publications

Printed detector bands for measurements of strain in core interior of transformers

Printed detector bands for measurements of strain in core interior of transformers

A Novel Method to Enhance the Core Design of Power Transformers Using Particle Swarm Optimization (PSO) Technique

Modelling of magnetostriction of transformer magnetic core for vibration analysis

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