Why there is a small amount of current in the line during no load condition?

Why there is a small amount of current in the line during no load condition?

This is due to the fact that the no-load current of 3 amperes is very small compared to the larger 56 amperes drawn by the primary winding from the supply. So the primary and secondary windings of a transformer possess both resistance and reactance.

Does the transformer draw any current when secondary is open?

Since the secondary of the transformer is open, the primary draws only no-load current, which will have some copper loss. Therefore, power is no longer transferred from primary to secondary in this approximation, and negligible current goes through the secondary windings.

What is the condition for zero voltage regulation?

Condition for Zero Voltage Regulation Zero voltage regulation means, Sending end voltage and Receiving end voltage become equal. This case is also known as the ideal voltage regulation. Ideal voltage regulation is desirable in a power system but not possible practically.

For which type of load the voltage regulation of a transformer is zero?

capacitive load
The voltage regulation of the transformer is zero at a leading power factor load such as a capacitive load. This is the leading power factor at which voltage regulation becomes zero while supplying the load.

Why CT secondary is always shorted?

A CT has generally 1:1000 or 1:2000 primary:secondary ratio. Now if secondary of CT is left open then a extremely high voltage will appear across open secondary ends which might damage CT. Therefore secondary is intentionally shorted when output is not connected to any measuring instrument.

Why transformer draws more current when load is connected at secondary?

Because of the resistive drop. As the Load increases, the current on the secondary side also increases. Therefore, the resistive drop on the secondary winding also increases substantially which reduces the terminal (secondary) voltage.