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Talks and Poster Presentations (with Proceedings-Entry):

G. Shilyashki, H. Pfützner, F. Hofbauer, V. Galabov, E Mulasalihovic:
"Effects of Moderate DC Bias on Magnetostriction of Grain Oriented SiFe";
Talk: International Workshop on 1&2 Dimensional Magnetic Measurement and Testing, Wien, Österreich; 09-03-2012 - 09-06-2012; in: "Short Paper Proceedings", (2012), ISBN: 3-902-105-03-8; 45 - 46.



English abstract:
As well known, long-term DC-bias deteriorates the performance of transformer cores, leading to increases of excitation, losses and noise. This study concerns effects of moderate bias on magnetostriction (MS) under alternating as well as rotational magnetization as being typical for T-joint regions. Investigations were performed on two grades of grain oriented transformer steel by means of a rotational single sheet tester (RSST). They reveal significant increases of MS for axis ratios a up to 0.3. For higher values, up to 0.5, the effects tend to cease. The relevance of RSST data was checked by strain gauge measurements of MS on 19 surface locations of a 3-phase, 3-limb model core. Moderate DC bias was restricted to the middle limb, corresponding to the so-called unbalanced case. It yielded distinct increases of MS with high scatter and strong regional differences. The orders of increases range from zero for the middle limb over 70% for the T-joint up to 150% for yokes and outer limbs.

Created from the Publication Database of the Vienna University of Technology.