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Transformer Size Guide for Nigeria: kVA, Amps and Typical Use
A distribution transformer is sized by the kVA of the load it serves, with margin for growth. The figures below are typical three-phase values for 415 V secondary units.
Confirm voltage, vector group and protection with a qualified electrical engineer before ordering.
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- Total connected load in kW or kVA
- Primary voltage (11 kV or 33 kV) and secondary voltage (415 V)
- Oil-filled or dry-type
- Delivery location and required date
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Common Transformer Sizes
- 100kVA: about 139 A at 415 V, about 5.2 A at 11 kV. A small distribution unit for a compact estate, a market block or a cluster of commercial customers
- 200kVA: about 278 A at 415 V, about 10.5 A at 11 kV. A common size for small estates, mid-size commercial blocks and light industrial sites
- 300kVA: about 417 A at 415 V, about 15.7 A at 11 kV. A typical DisCo-style estate or commercial transformer serving several hundred households or a mid-size factory
- 500kVA: about 696 A at 415 V, about 26.2 A at 11 kV. The workhorse size for large estates, big commercial complexes and medium industrial plants
- 1000kVA: about 1391 A at 415 V, about 52.5 A at 11 kV. A large unit for industrial plants, bottling lines and major commercial developments
How to Choose
- Add up the connected load and apply a diversity factor with your engineer
- Leave 20 to 30 percent spare capacity for growth
- Match the primary voltage to your supply (11 kV or 33 kV)
- Choose oil-filled for outdoor use or dry-type for indoor, fire-sensitive locations
Frequently Asked Questions
How do I size a transformer for my load?
Divide your total diversified load in kW by the power factor to get kVA, add growth margin, then pick the next standard size up.
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