Transformer & DG Set Sizing Calculator

Transformer & DG Set Sizing Calculator

Total Connected Load (kW):

Demand Factor (Safe Default: 0.7):

Safety / Future Margin (%):

Connected Backup Load on Generator (kW):

Sizing & Design Results

Estimated Max Demand: 0.0 kVA

Required Transformer Capacity: 0.0 kVA

Recommended Standard Transformer

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Required DG Capacity: 0.0 kVA

Recommended Standard DG Set Size

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Sizing Formulas & Guidelines:

• Maximum Demand (kVA) = (Total Connected Load in kW × Demand Factor) ÷ Power Factor (Assumed 0.8 as per standard guidelines).
• Required Transformer Capacity (kVA) = Max Demand (kVA) × (1 + Safety/Future Margin %). This value is mapped to the nearest standard commercial Indian transformer rating.
• Required DG Set Capacity (kVA) = (Backup Connected Load in kW × Demand Factor) ÷ (Power Factor 0.8 × Safe Continuous Engine Loading Limit 0.8). It is standard CPWD/CEA engineering practice not to load a backup generator beyond 80% capacity continuously.