Transformer Sizing Calculator — Formule
## 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%).
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%).
Exemple Résolu
200 kW total connected load, 80% demand factor, 0.85 PF, 20% growth.
- Maximum demand = 200 x 0.80 = 160 kW
- Required kVA = 160 / 0.85 x 1.20 = 225.9 kVA
- Select the next standard size: 250 kVA transformer.