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1990 INTERNATIONAL MAGNETICS CONF ( 1990 INTERMAG ), Date: 1990/04/17 - 1990/04/20, Location: ENGLAND, BRIGHTON

Publication date: 1990-09-01
Volume: 26 Pages: 1990 - 1992
Publisher: Ieee-inst electrical electronics engineers inc

IEEE Transactions on Magnetics

Author:

Findlay, R
Belmans, Ronnie ; Mayo, D

Keywords:

Science & Technology, Technology, Physical Sciences, Engineering, Electrical & Electronic, Physics, Applied, Engineering, Physics, 02 Physical Sciences, 09 Engineering, Applied Physics, 40 Engineering, 51 Physical sciences

Abstract:

It has been hypothesised that different stacking patterns of grain oriented silicon steel laminations, cut at small angles to the rolling direction can reduce the iron core losses in power transformer cores. Experiments testing this theory have been performed and will be reported here. The tests show that the hysteresis loss may be decreased, when compared to the stacking in a standard core, However eddy current losses are increased. The total iron losses do not appear to be reduced by cutting laminations at small angles to the rolling direction. However, for a few crosswise laminations losses were not increased either. In these samples hysteresis losses were decreased while reaching saturation at a lower level of magnetisation. The eddy currents in these packets are increased due to the harmonics generated by the saturation. The net result is an increase of the overall loss value as the angle to the rolling direction increases. Changing the stacking pattern may be used to reduce harmonics, without affecting the losses. This may contribute to the reliability of measuring transformers under extreme circumstances. © 1990 IEEE