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Characterisation of grain orientated electrical steels under high DC biased conditions

Harrison, Christopher and Anderson, Philip Ian 2016. Characterisation of grain orientated electrical steels under high DC biased conditions. IEEE Transactions on Magnetics 52 (5) , 2001604. 10.1109/TMAG.2016.2519945

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Power transformers are designed to operate under pure AC excitation, however they may be subjected to superimposed DC voltages and consequential offset currents, for example from geomagnetically induced currents, GICs, arising from solar activity. To determine the effects of DC offsets, a single sheet tester was used, with a digital excitation signal created with an AC waveform summed with a DC voltage addition and measured with a digital feedback control algorithm to ensure an ideal flux density waveform. Using this method results with 300% additional DC contribution were able to be measured for results up to BAC+BDC = 1:9 T. Measurements of grain orientated 3% Si-Fe show increasing power losses and peak applied magnetic field for peak to peak flux densities above 3 T, with a 33% increase in power loss and 500% increase in applied magnetic field with for an offset of 25%.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Publisher: IEEE
ISSN: 0018-9464
Date of First Compliant Deposit: 26 May 2016
Date of Acceptance: 12 January 2016
Last Modified: 08 Jul 2019 12:54

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