Transformer Sizing Calculator
Calculate the proper transformer size for your electrical project. Determine kVA rating based on load requirements, voltage, phase, and safety factors.
Step 1: Load Requirements
150 kW
Understanding Transformer Sizing
Transformer size (kVA) = Load (kW) ÷ Power Factor. Always add a safety margin for future expansion and to prevent overload conditions.
Step 2: Voltage & Safety
20%
About Safety Margin
A safety margin of 15-25% is recommended for most applications to accommodate future load growth and prevent transformer overload.
Transformer Sizing Results
Summary
Size Comparison
Specifications
Required Transformer Size
187.5 kVA
Based on 150 kW load with 0.8 power factor and 20% safety margin
Apparent Power
187.5 kVA
Primary Current
9.83 A
Secondary Current
270.6 A
Recommended Standard Size
200 kVA
Standard Transformer Sizes Comparison
| Standard Size (kVA) | Capacity Margin | Primary Current (A) | Secondary Current (A) |
|---|
Transformer Specifications
Transformer Sizing Formula
kVA = (kW ÷ Power Factor) × (1 + Safety Margin)
To calculate transformer size: Divide the real power (kW) by the power factor to get apparent power (kVA), then add safety margin percentage.
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