EQUIVALENT CIRCUIT REFERRED TO PRIMARY SIDE AND SECONDARY SIDE, VOLTAGE REGULATION OF A TRANSFORMER

 EQUIVALENT CIRCUIT REFERRED TO PRIMARY SIDE - :

When all parmeter are reffered to primary side, 

  Secondary emf referred to primary side, E'2=KE2

Secondary terminal voltage referred to primary, V'2 =KV2

Secondary current referred to primary, I'2=I2/K

Secondry resistance referred to primary! R'2=K™2X2

primary side       

  

Let R, Z and Z represents the equivalent resistance,equivalent reactance and equivalent impedance repectively of the whole transformer reffered to the primary. Then

 R=primary resistance +secondry resistance reffered to primary 

R=R1+R'2 =R1 +R2(N1/N2) ™2=R1 +K™2R2

X=X1+X'2=X1+X2 (N1/N2) ™2=X1+K™2X2

Z=Z1+Z'2=Z1+Z2(N1/N2)™2=Z1+K™2Z2

also,

Z=R+jX

EQUIVALENT CIRCUIT REFERRED TO SECONDARY SIDE-:

when all parameter are reffered to secondry side