sheet steel under different temperature, harmonic
and dc bias
Dezhi Chen - Li wei Fang - Byung-il Kwon
School of Electrical Engineering, Shenyang University of Technology,
Shenyang, China
I. INTRODUCTION
The phenomena such as the DC power grid, geomagnetic storms change, DC voltage of converter transformer may result in DC bias. Then the DC bias leads to the magnetic leakage flux increase in cores, metal structure losses, temperature rise, local overheating, dielectric breakdown, noise vibration, even the permanent damage to transformer.1 Meanwhile, the rise of temperature and harmonic will also affect the magnetic properties of electrical sheet steel. Manufacturers of electrical sheet steel can provide magnetic parameters, such as loss of iron core, that usually are measured at room environment temperature. The measured electromagnetic performance of transformer has a certain error compared with the actual operation temperature.2 When temperature, harmonic and DC bias change at the same time, the transformer operation condition will be more complicated. This paper is the first time to present the measurement research on the magnetic properties of oriented electrical sheet steel considering both different temperature and DC bias, and it shows the curve of magnetic properties under different temperatures (40 °C to 150 °C), frequency(50Hz to 4.5kHz) and DC bias (0A to 2.0A). It can provide a useful guidance for the design and optimization of power transformer
LINK ORIGINAL
http://aip.scitation.org/doi/pdf/10.1063/1.4979490
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