April 2011
Intermediate to advanced
992 pages
28h 25m
English
Content preview from J & P Transformer Book, 13th Edition
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Appendix 4: Transformer regulation
The standard formula for determining the percentage regulation of a transformer at full load and at a power factor cos Ø is *
where Vx is the percentage reactance voltage at full load VR is the percentage resistance voltage at full load Ø is the angle of lag of the full-load current
This formula is correct for the determination of the regulation at any load differing from full load, and it is only necessary to divide Vx and VR wherever they appear in the formula by the factor given by dividing the full-load current by the current corresponding to the particular load at which the regulation ...
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