Transformers
Oil-immersed transformers
Oil-immersed distribution transformers for outdoor and utility applications. Define rating, voltage ratio, losses and installation conditions together.
Application & selection
A clear electrical and mechanical brief.
Key information for configuration review
- Rating (kVA) and quantity
- Primary and secondary voltage, tapping range
- Hermetic or conservator
- Loss limits or loss capitalisation formula
Technical overviewStart with the
Start with the
right specification.
Use this selection reference to prepare your project brief.
Reference values are not a model datasheet. Availability, standards and test coverage require confirmation for the offered equipment.
Download project sheets ↓Selection reference +
| Rated power, reference | 25, 50, 100, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500 kVA |
|---|---|
| Primary voltage | 11, 22, 33 kV |
| Secondary voltage | 400/230 V or 415/240 V |
| Tapping | Off-circuit tap changer, typically ±2 × 2.5% |
| Vector group | Dyn11 (others to specification) |
| Cooling | ONAN |
| Insulating liquid | Mineral oil to IEC 60296; natural or synthetic ester subject to manufacturer confirmation |
| Windings | Copper or aluminium |
| Accessories | Oil level indicator, pressure relief device, thermometer; Buchholz relay for conservator type, to specification |
Testing topics to confirm +
Confirm the applicable requirements, available reports and agreed test scope with the proposed manufacturer.
| Routine tests (every unit, IEC 60076-1) | Winding resistance; voltage ratio and phase displacement; short-circuit impedance and load loss; no-load loss and current; applied voltage and induced voltage tests; leak test |
|---|---|
| Type tests (per design) | Temperature rise (IEC 60076-2); lightning impulse (IEC 60076-3); short-circuit withstand (IEC 60076-5) where the tender requires it |
Project document package +
- Model-specific datasheet and approved drawings
- Applicable test reports and their coverage
- Inspection, packing and delivery requirements
Project resourcesBring your next project
Bring your next project
into focus.
Explore the equipment guide and prepare your requirements with our fillable project sheets.