Equivalent Ckt of transformer


Equivalent circuit of no load transformer



equivalent circuit 

In the given figure we take primary referred equivalent.
I2’ = I2\a                      where,         a = turn ratio = N1\N2
R2’ = a2R2                                   Gi = R0       Bm = X0
X2’= a2X2
V2’ = aV2



                    approximation circuit


Full load equivalent phasor diagram for inductive load.


The KVL equations for the primary and secondary circuits are

V1 = E1 + I1R1 + j I1X1
V2 = E2 - I2R2 - j I2X2

In ideal case Iw is in phase with E1
Im is 90° lagging E1
The exact phasor diagram from these equations is drawn.

click here to go KVL
click here to go nodal analysis
click here to go losses in transformer

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