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What is the definition of no-load current of a transformer

The r.m .s. value of the current flowing through a line terminal of a winding when rated voltage (tapping voltage) is applied at rated frequency, the other winding or windings being open circuited
NOTE 1 For a three-phase transformer, the value is the arithmetic mean of the values of current in the three phases.
NOTE 2 The no-load current of a winding is often expressed as a percentage of the rated current of that winding.

For a multi-winding transformer this percentage is referred to the winding with the highest rated power.
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