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TRANSFORMER TAP RATIOS

TRANSFORMER TAP RATIOS

TRANSFORMER TAP RATIOS

(OP)
Does anyone know how the primary taps ratio on a transformer work.  Is a +2.5% tap apply to the full voltage accros the primary or to the number of turns on the primary?  To raise the secondary voltage does one connect to the + or the (-) taps?

RE: TRANSFORMER TAP RATIOS

The tap value is the % change in the number of primary turns.  A +2.5% primary tap means that for a primary voltage 2.5% higher than the nominal, the secondary no-load voltage will be at nominal.  To raise the secondary voltage, lower the primary tap.

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