Operation and Phasor Diagram of IDEAL Transformer !!!
 |
| Operation and Phasor Diagram of IDEAL Transformer !!! |
IDEAL TRANSFORMER :
The transformer, in which no energy is wasted in the core and in the winding is called
the ideal transformer.
An ideal transformer is an imaginary transformer which has the following properties.
(1) Its primary and secondary winding resistances are negligible.
(2) The core has infinite permeability (u).
(3) Its leakage flux and leakage inductances are zero.
(4) There are no losses.
(5) The working efficiency is 100%.
Operation and Phasor Diagram
An ideal transformer is shown in below image. It consists of two coils. The winding connected
to the supply (V1) is called the primary winding. The winding connected to the load is
called the secondary winding.
 |
| Ideal Transformer |
Since the ideal transformer has zero primary and zero secondary impedance, the voltage
induced in the primary E, is equal to the applied voltage V1.
Similarly, the secondary voltage V2 is equal to the secondary induced voltage E2.
When the primary winding connected to the supply, the primary draws the magnetizing
current Im only.
The alternating currents Im produces an alternating flux m which is in Same phase with Im.
This changing flux is linked both with the primary and the secondary windings.
Therefore it self-induced e.m.f. in the primary. This self-induced e.m.f. E is at every instant,
equal and opposite to V1. The magnetizing current Im lags V1 by 90°.
E1 = -V1 and E2 = V2
Flux also links with secondary winding and induces emf E2 in it. This emf lags 90° behind flux. Below shows the vector diagram.
 |
| Vector Diagram of Practical Transformer |
