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500kVA Transformer Specifications and Ratings
These are the typical electrical figures for a 500kVA three-phase distribution transformer. Exact values vary by manufacturer, so treat them as planning numbers and confirm against the data plate.
The unit is the workhorse size for large estates, big commercial complexes and medium industrial plants.
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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: 500 kVA, three-phase
- Low-voltage side, 415 V: about 696 A per phase
- High-voltage side, 11 kV: about 26.2 A per phase
- High-voltage side, 33 kV: about 8.7 A per phase
- Typical impedance: about 4 percent
- Typical vector group for distribution use: Dyn11
Choosing Protection and Cabling
- Size the low-voltage breaker and cables for about 696 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 500kVA transformer?
Plan the low-voltage cable for about 696 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 500kVA transformer?
Typically about 4 percent, but confirm it on the data plate because it affects fault current and protection design.
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