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1000kVA Transformer Specifications and Ratings
These are the typical electrical figures for a 1000kVA three-phase distribution transformer. Exact values vary by manufacturer, so treat them as planning numbers and confirm against the data plate.
The unit is a large unit for industrial plants, bottling lines and major commercial developments.
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- Capacity in kVA
- Primary voltage (11 kV or 33 kV) and secondary voltage (415 V)
- Oil-filled or dry-type, and indoor or outdoor
- Vector group, such as Dyn11
- New or fairly used, and quantity
- Delivery location and required date
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Typical Electrical Figures
- Rated power: 1000 kVA, three-phase
- Low-voltage side, 415 V: about 1391 A per phase
- High-voltage side, 11 kV: about 52.5 A per phase
- High-voltage side, 33 kV: about 17.5 A per phase
- Typical impedance: about 5 to 6 percent
- Typical vector group for distribution use: Dyn11
Choosing Protection and Cabling
- Size the low-voltage breaker and cables for about 1391 A, with margin for future load
- Use correctly rated HV fuses or a circuit breaker for the primary side
- Earth the neutral and the tank to the site earthing system
- Have a qualified engineer sign off the protection scheme
Confirm With the Supplier
- Primary and secondary voltage, tap range and vector group
- Cooling class and oil volume for outdoor units
- Factory test report and warranty
- Delivery, offloading and installation support
Frequently Asked Questions
What size cable do I need for a 1000kVA transformer?
Plan the low-voltage cable for about 1391 A plus margin. The exact size depends on length, installation method and local standards, so have an electrical engineer confirm it.
What is the impedance of a 1000kVA transformer?
Typically about 5 to 6 percent, but confirm it on the data plate because it affects fault current and protection design.
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