Research on power transformer vibration and noise under DC bias condition

Author:

Ai Mengmeng12,Liu Wenhui1,Shan Yi1

Affiliation:

1. College of Electrical and Electronic Engineering, Harbin University of Science and Technology, , China

2. The Key Lab of National and Local United Engineering for Electric & Heat Transfer Technology of Large Electrical Machine, Harbin University of Science and Technology, , China

Abstract

In the process of Ultra high voltage direct current (UHVDC) transmission, the direct current (DC) bias of power transformer is easily induced, which makes the transformer exciting current distorted, the ferromagnetic material saturated and the magnetic leakage increased, and then leads to the increase of core vibration and noise. Aiming at this problem, taking a 240 MVA, 330 kV three-phase five-column power transformer as an example, the coupling of the electromagnetic field, structural force field and acoustic field is studied, and the influence of DC bias on vibration and noise of power transformer core is analyzed in this paper. According to the magnetic density and electric density of transformer core under different magnetic bias degree, the structural force field is solved, and the displacement and surface acceleration of core are obtained, which can be as the excitation of sound field to determine the noise distribution of transformer. In order to avoid the natural frequencies which easily cause resonance, the modal analysis is needed to obtain the natural frequencies and modal modes of the core. The transformer noise under no-load and DC bias conditions of the prototype is tested experimentally and compared with the theoretical calculation, the results prove the accuracy of the simulation calculation method in this paper.

Publisher

IOS Press

Subject

Electrical and Electronic Engineering,Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,Electronic, Optical and Magnetic Materials

Reference26 articles.

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4. Analysis of Eddy-current losses in solid iron under DC-biased magnetization considering minor hysteresis loops;Shima;Electrical Engineering in Japan,2014

5. Effect of DC biasing in 3 legged 3 phase transformers taking detailed model of off-core path into account;Lotfi;Electric Power Systems Research,2016

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