Transformer Calculator

Transformer winding – turns and voltage Ratio


Transformer EMF

In Hz
In wb (weber)

r.m.s value of EMF =

RMS value of induced emf,

E1 = 4.44f N1 Φm, Primary winding

E2 = 4.44f N2 Φm, Secondary winding


Transformer Full Load Current

To calculate full load current of a Single Phase Transformer

To calculate full load current of a Three Phase Transformer


KVA rating of Transformer

Rating of a Single Phase Transformer

In Volts
In Amperes

KVA

Rating of a Three Phase Transformer

In Volts
In Amperes

KVA


Transformer Losses – Iron loss, copper loss

Copper Loss Calculation

Primary current
Primary Winding Resistance
Secondary current
Secondary Winding Resistance

Total Copper Loss, Pcu = w

Iron Loss or Core Loss Calculation

Eddy current Loss

 

 

co-efficient of eddy current

 

Thickness of the sheet

 

Input values Maximum Flux density "Bm" and frequency 'f' is common to eddy current loss and hysteresis loss.

Maximum flux density
frequency

Hysteresis Loss

 

hysteresis constant

Total Iron Loss in w/m3, Pi =

w/m3

Hysteresis Loss

+

w/m3

Eddy current Loss

=

watts/m3