Which transformer has core loss less than full load copper loss?

Distribution transformers
Distribution transformers have core losses less than full load copper losses.

Why are core losses negligible during running of induction motor?

As the slip of induction motor is near to zero i.e. of the order of 0.02, hence the frequency of rotor will be 0.02×50 Hz = 1 Hz (Assuming the supply frequency of 50 Hz). That is why under normal operating condition the rotor core loss of Induction Motor is negligible.

What are the copper losses how do they vary with the load current and why?

The copper loss in the transformer is proportional to the square of the current flowing through the winding. When the load on the transformer is increased the copper loss varies because of the increased current and increased resistance caused by temperature rise.

Why transformer has constant core losses explain in short?

Core loss, also known as Iron Loss, is ultimately caused by the alternating magnetic flux in the core. It is a loss that happens in the core of a transformer when it is subjected to a change in alternating changes in magnetic flux subjected to the material.

How do induction motors reduce copper loss?

Improving slot fill will help your copper loss, by putting bigger wires in the stator slot, the wire resistance will reduce and the copper loss will go down. Reducing the end turn height of the windings will also help reduce copper losses.

Why does copper loss occur in transformer?

Copper losses are due to the resistance of the wire in the primary and secondary windings and the current flowing through them. These losses can be reduced by using wire with large cross-sectional area in the manufacturing of the coils.

What are the losses in an induction motor?

The following are the losses in an induction motor: The rotor copper loss is calculated by subtracting the stator copper loss from the total measured loss or the rotor I 2 R loss. The friction and windage loss may be assumed constant, irrespective of the load.

What happens to the core loss when the motor increases speed?

That means high core losses in the rotor. As the motor comes up to speed, the rotor current and the rotor frequency both drop. So the rotor core losses at full speed are very low. The rotor losses don’t change very much. The total core loss would decrease.

How do you calculate the rotor copper loss?

The rotor copper loss is calculated by subtracting the stator copper loss from the total measured loss or the rotor I 2R loss. The friction and windage loss may be assumed constant, irrespective of the load.

What are the losses in the rotor winding of a motor?

I2 R losses in the rotor winding. These losses occur due to the resistance of rotor winding as well as the resistance of stator winding. These losses are also called copper losses. These are proportional to the square of stator and rotor currents respectively.