Harrison, Christopher and Anderson, Philip Ian ![]() |
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Abstract
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 |
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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: | 05 May 2023 18:10 |
URI: | https://orca.cardiff.ac.uk/id/eprint/85100 |
Citation Data
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