During No load why the power factor of the transformer is very low ?
■ Ans: Current flowing through the transformer consists of two
components. Magnetizing current (Im) which is in quadrature (900) to the
applied voltage and in phase current which is in phase to the applied
voltage. During no load condition most of the excitation current drawn
by the transformer from the primary winding is to magnetize the path.
Hence excitation current drawn by the transformer during no load
condition mostly consists of magnetizing component of current which is
used to provide magnetic field in transformer circuits (Inductive
nature). Therefore as the nature of the load is inductive, hence the
power factor of transformer during no load condition will by in the
order of 0.1 to 0.2
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