Electrotechnology
Electrotechnology
Lab Report
Aim:
To investigate and analyse single-phase transformers in a circuit
Objectives:
To determine the approximate equivalent circuit of a single-phase transformer so the transformer can be modelled, predicted and analysed.
Equipment:
TecQuipment electrical machines teaching unit NE8010 or NE8013
B-phase transformer (EMTU-TT01)
One Hameg HM-8115-2 Power meter
Wires
Introduction and theory of Transformers:
Transformers are simple, energy transfer devices that are widely used for power transmission. Depending on how well they are made and designed, they can be nearly 100% efficient.
The most basic of single-phase transformers has two coils or windings on it, one called the primary winding and one called the secondary winding, both of which are made out of conductive material. These windings are attached to the limbs of the transformer core as shown in the pic of an ideal transformer. The core itself is made out of magnetic material.
Pic of ideal transformer
The two windings have no conductive connection between them and are kept separate, usually by the length of the yoke and also by insulation around the conductive material. In other words they are not linked electrically but they are linked magnetically. On the input side of the transformer (primary winding) a varying electrical current is applied. This varying current produces magnetic flux that flows around the core. This varying magnetic flux causes the secondary winding to induce an electromotive force (EMF) and this will cause a current to flow from the secondary winding. This is called mutual inductance, when the change in current in one winding results in an induction of voltage in the other winding. The varying electrical current is most commonly alternating current but pulsed continuous current can be used as well to make the transformer work.
According to the laws of conservation of energy, the energy input equals energy output. For ideal
Lab Report
Aim:
To investigate and analyse single-phase transformers in a circuit
Objectives:
To determine the approximate equivalent circuit of a single-phase transformer so the transformer can be modelled, predicted and analysed.
Equipment:
TecQuipment electrical machines teaching unit NE8010 or NE8013
B-phase transformer (EMTU-TT01)
One Hameg HM-8115-2 Power meter
Wires
Introduction and theory of Transformers:
Transformers are simple, energy transfer devices that are widely used for power transmission. Depending on how well they are made and designed, they can be nearly 100% efficient.
The most basic of single-phase transformers has two coils or windings on it, one called the primary winding and one called the secondary winding, both of which are made out of conductive material. These windings are attached to the limbs of the transformer core as shown in the pic of an ideal transformer. The core itself is made out of magnetic material.
Pic of ideal transformer
The two windings have no conductive connection between them and are kept separate, usually by the length of the yoke and also by insulation around the conductive material. In other words they are not linked electrically but they are linked magnetically. On the input side of the transformer (primary winding) a varying electrical current is applied. This varying current produces magnetic flux that flows around the core. This varying magnetic flux causes the secondary winding to induce an electromotive force (EMF) and this will cause a current to flow from the secondary winding. This is called mutual inductance, when the change in current in one winding results in an induction of voltage in the other winding. The varying electrical current is most commonly alternating current but pulsed continuous current can be used as well to make the transformer work.
According to the laws of conservation of energy, the energy input equals energy output. For ideal