Applications
Transformers for onshore wind farms
A wind farm transformer does not see a steady load. It sees a load that swings with the wind, at sites that are often cold, remote and expensive to revisit.
Wind farm collector substation transformer: collection and step-up
- Turbine output (690 / 900 / 1140 V)
- turbine step-up transformer
- collection at 33 / 34.5 / 66 kV
- collector substation main transformer
- 132–400 kV transmission
Wind turbine step-up transformer failure: the cyclic loading case
IEC 60076-7 sets out how cyclic loading drives hot-spot temperature and how that converts into insulation ageing. A transformer sized for the peak is not automatically sized for the cycle. We calculate the ageing rate over the actual duty cycle, not over a nominal continuous rating.
Cold-climate sites
Below −25 °C, insulating fluid viscosity, material toughness and loading limits all change. Our own plants operate in northeast China, where winter design temperatures reach −40 °C, and that experience feeds directly into the designs we offer for high-latitude wind sites.
GSU transformer for renewable energy projects
Where a project uses a central inverter or a synchronous condenser, the step-up transformer's low-voltage winding must match the machine's output voltage. We build low-voltage windings at 6.3, 6.6, 10.5, 13.8, 15.75, 18, 20 and 24 kV.
What we supply for wind
| Turbine step-up transformers | 690 V–35 kV, 30 kVA to 31.5 MVA, dry-type or oil-immersed. |
|---|---|
| Collector substation transformers | 33–220 kV, up to 240 MVA. |
| Main step-up and GSU transformers | 110–500 kV, up to 600 MVA. |
Can you supply 66 kV collector transformers?
Yes. Our standard range includes 66 kV units from 6.3 to 63 MVA, which matches the collection voltage used on Australian and several Asian wind projects.