Free Transformer Sizing Calculator
Determine the required transformer kVA rating from the connected three-phase load.
Required kVA (with growth)
226 kVA
Required kVA (with growth) vs Total Connected Load
Transformer Sizing
The transformer must handle the maximum demand load with adequate margin.
Method
Maximum demand = Total connected load x Demand factor
Required kVA = Max demand (kW) / Power factor x (1 + Growth margin)
The demand factor accounts for the fact that not all loads operate simultaneously. The growth margin reserves capacity for future expansion (typically 15-25%).
Example Calculation
200 kW total connected load, 80% demand factor, 0.85 PF, 20% growth.
- 01Maximum demand = 200 x 0.80 = 160 kW
- 02Required kVA = 160 / 0.85 x 1.20 = 225.9 kVA
- 03Select the next standard size: 250 kVA transformer.
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