Electrical Machines Transformer Regulation of a Transformer

The condition for maximum regulation of a single-phase transformer with equivalent resistance, Req, equivalent reactance, Xeq, and load power factor angle, ϕ, is

1
\(\cos {\phi } = \frac{{ X_{eq}}}{{ R_{eq}}}\)
2
\(\cos {\phi } = \frac{{ R_{eq}}}{{ X_{eq}}}\)
3
\(\tan {\phi } = \frac{{ R_{eq}}}{{ X_{eq}}}\)
4
\(\tan {\phi } = \frac{{ X_{eq}}}{{ R_{eq}}}\)
5
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