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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