July 2015
Intermediate to advanced
1140 pages
35h 55m
English
book
Power Quality in Power Systems and Electrical Machines, 2nd Edition
by Ewald F. Fuchs, Mohammad S. Masoum
Content preview from Power Quality in Power Systems and Electrical Machines, 2nd Edition
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8.3.6 Application Example 8.11: Three-Phase Transformer with DC Bias Current
The losses of a 4.5 kVA three-phase transformer bank supplying power to resistive load under various DC bias conditions are to be measured. The measuring circuit for the Δ–Y0 connected three-phase transformer bank (see Appendix 4.2) is shown in Fig. 8.16. The transformer is operated at 75% of rated load with various (magnetizing current ranging from 0 to Im = 1.25 A) balanced DC bias currents injected on the Y0 side, and the DC copper, AC copper, and iron-core losses are to be measured separately. Such DC currents can be generated by either unbalanced rectifiers, geomagnetic storms [31,80,93,94], or nuclear explosions.
Solution to Application Example 8.11
Measured ...
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