Transformer Magnetizing Reactance

[darkwhite87]

In the case of an open-circuit test of transformer, when I increase the supply voltage, i realize the magnetising reactance (Xm) decreases, why does this happen?

 

[berkeman]

In the case of an open-circuit test of transformer, when I increase the supply voltage, i realize the magnetising reactance (Xm) decreases, why does this happen?

You might be saturating it.

 

[oswaler]

The magnetizing reactance (Xm) of a transformer is a measure of the opposition to the flow of magnetizing current through the transformer's primary winding. This reactance is affected by the strength of the magnetic field produced by the transformer, which is in turn influenced by the supply voltage.

When the supply voltage is increased during an open-circuit test, the magnetic field strength also increases. This leads to a decrease in the magnetizing reactance as the stronger magnetic field allows for a more efficient flow of magnetizing current. This phenomenon is known as the saturation of the transformer's magnetic core.

In other words, as the supply voltage increases, the transformer's magnetic core becomes saturated and the magnetizing reactance decreases. This is a normal behavior of a transformer and is taken into consideration during its design and operation.