Magnetizing current is a current component which is seen in electrical machines likes transformers and motors. No load current of transformer has two components, one is the magnetizing component and other is the active component.
Magnetizing component is also called the reactive or wattles component of no-load current. The active component or watt full component supplies the hysteresis and eddy current loses. Magnetizing component of no load current magnetizes the core of the transformer. Thus this component sets up flux in the transformer core.
Magnetizing current is in phase with the flux and is 90 ° to applied voltage and active component. Magnetizing current is associated with the primary winding of the transformer. It is the current that flows in primary when voltage is applied across it and in this condition secondary is unloaded. Magnetizing current value is related to supply voltage, frequency and primary inductance value. Primary side always has a current irrespective of the load condition of transformer which is called magnetizing current and this current adds on to the load current. So primary of transformer draws a peak current that is known as magnetizing inrush current. Magnitude of this current is high and it lasts for a very less time and it is transient in nature.
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