Transformer Formulas
Single Phase Transformer Full-Load Current (Amps)= kVA × 1000 / V
Three Phase Transformer Full-Load Current (Amps) = kVA × 1000 / (1.732 × V)
Where:
kVA = transformer rating (kilovolt-amperes),
V = voltage (volts).
Turns Ratio = N1 / N2 = V1 / V2 = I2 / I1
Where:
N1 = number of turns on the primary,
N2 = number of turns on the secondary,
V1 = primary voltage,
V2 = secondary voltage,
I1 = primary current,
I2 = secondary current.
Example: A 50 kVA single-phase transformer has a 4000 V primary, and a 400 V secondary. Assuming an ideal transformer, determine (a) the primary and secondary full-load currents, (b) the transformer turns ratio.
a) V1 = 4000 V, V2 = 400 V,
Transformer Rating = 50 kVA = V1 × I1 = V2 × I2
Primary full-load current, I1 = (50 × 1000 / 4000) = 12.5 A
Secondary full-load current, I2 = (50 × 1000 / 400) = 125 A
b) Turns Ratio = N1 / N2 = V1 / V2 = (4000 / 400) = 10
Comments
Post a Comment
If any doubts let me know..