TRANSFORMERS
Lecture Notes: EEE
Instructor: Dr. U D Dwivedi
, Ideal Transformer
An ideal transformer (unlike the real one) can be
characterized as follows: μr= infinite
1. Primary and secondary windings has no resistance.
2. All the flux produced by the primary links the
secondary winding i,e., there is no leakage flux.
Magnetizing current (A)
3. Permeability μr of the core is infinitely large.
In other words, to establish flux in the core
vanishingly small (or zero) current is required.
Magnetization curve of
1. Core loss is neglected, i.e. no hysteresis and
an ideal transformer
no eddy currents.
,Analysis of ideal transformer
, Analysis of ideal transformer
On applying KVL on Primary we get
I1
Therefore, = turn ratio
I2
Transformer ratio: . a = 1/turn ratio
No load phasor diagram:
Lecture Notes: EEE
Instructor: Dr. U D Dwivedi
, Ideal Transformer
An ideal transformer (unlike the real one) can be
characterized as follows: μr= infinite
1. Primary and secondary windings has no resistance.
2. All the flux produced by the primary links the
secondary winding i,e., there is no leakage flux.
Magnetizing current (A)
3. Permeability μr of the core is infinitely large.
In other words, to establish flux in the core
vanishingly small (or zero) current is required.
Magnetization curve of
1. Core loss is neglected, i.e. no hysteresis and
an ideal transformer
no eddy currents.
,Analysis of ideal transformer
, Analysis of ideal transformer
On applying KVL on Primary we get
I1
Therefore, = turn ratio
I2
Transformer ratio: . a = 1/turn ratio
No load phasor diagram:
