Question

Equivalent circuit of transformer

Answer 1

Equivalent circuit of transformer:

Let V₁ is the AC supply given to primary winding of transformer.

R₁ is the resistance of primary winding.

X₁ is the leakage reactance of primary winding.

I₁ is primary current.

I_o is no load current.

I_c is core loss current.

R_c is core loss resistance. Core loss is also called as iron loss, which is hysteresis loss and Eddy current loss.

I_m is the magnetizing current.

X_m is the magnetizing reactance.

I₁' is the current through primary winding.

E₁ is the primary induced EMF.

N₁ is the number of turns at primary winding.

N₂ is the number of turns at secondary winding.

E₂ is the secondary induced EMF.

R₂ is the resistance of secondary winding.

X₂ is the leakage reactance of secondary winding.

I₂ is the secondary current.

Z_L is the inductive load.

V₂ is the output voltage.

Answer 2

Equivalent Circuit Diagram of Transformer Referred to Primary:

V1 -Primary Input voltage

I1 - Input Current

I0- Exciting current/ No load current

Im- Magnetizing component of no load current

Iw-Working component of no load current

R0- Core loss resistance

X0- magnetizing reactance

R1 -Primary winding resistance

X1 - Primary winding reactance

E1 –Induced emf in Primary winding

R2′ - Secondary winding resistance referred to primary

X2′- Secondary winding reactance referred to primary

I2-Secondary winding current

I2′– Primary equivalent of secondary current

K- Transformation ratio

V2- Secondary terminal voltage

V2′- Primary equivalent of secondary terminal voltage

ZL– Load impedance

ZL ′- Primary equivalent of load impedance