Basic Electronics and Electrical Engineering: Chapter 3: Transformer
Ideal Transformer
An ideal transformer is one which has (i) no winding resistance. (ii) no magnetic leakage flux (i.e., the same flux link both the windings). (iii) no iron losses (i.e., eddy current and hysteresis) in the core. (iv) no copper loss.
IDEAL
TRANSFORMER
An ideal transformer is
one which has
(i) no winding
resistance.
(ii) no magnetic
leakage flux (i.e., the same flux link both the windings).
(iii) no iron losses
(i.e., eddy current and hysteresis) in the core.
(iv) no I2R
loss i.e., copper loss.
Consider an ideal
transformer whose secondary is open and whose primary is connected to
sinusoidal alternating voltage V1. The primary winding draws a small
magnetising current Iμ which lags behind the voltage V1
by 90°.
This alternating
current Iμ produces an alternating flux ϕ which is in phase with it.
This flux ϕ links both the winding and induces emf E1 in the primary
and emf E2 in the secondary.
The phasor diagram of
an ideal transformer on no load are shown in Fig. 3.6 Since flux ϕ is common to
both the windings, it has been taken as the reference phasor, the primary emf E1
and secondary emf E2 lag behind the flux ϕ by 90°. Note that E1
and E2 are in phase. But E1 is equal and opposite to V1
(Lenz's law).
Basic Electronics and Electrical Engineering: Chapter 3: Transformer : Tag: Basic Engineering : - Ideal Transformer
Basic Electronics and Electrical Engineering: Chapter 3: Transformer
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