Step-Up Transformer for Solar Farms: What Changes at the Grid-Tie Point
A solar farm does not load a transformer the way a factory does. The inverter sits on the low-voltage side, the output follows the sun rather than a shift pattern, and the unit lives outdoors through the full seasonal swing. Sizing it like a general distribution transformer is the usual mistake.
Three things that differ from a factory duty
- Harmonic content from the inverter switching, which heats windings beyond the fundamental.
- A load curve that peaks briefly and averages low — continuous rating is not the whole story.
- Outdoor siting with daily and seasonal temperature cycling.
What to look at in the specification
- Inverter-side voltage and the grid-side voltage you are stepping up to.
- Rating matched to the total inverter output, not the array peak.
- Vector group, commonly Dyn11 or Yyn0 depending on the interconnection rules.
- Enclosure rating and cooling, given the site conditions.
- Tapping range, to cover grid voltage variation at the point of connection.
Integrated compact substations
Where the project wants one package, the medium-voltage switchgear, transformer, low-voltage distribution and protection can be delivered as a single prefabricated enclosure. That removes the interface work on site and shortens commissioning. Ratings in this range are built to order and designed to comply with the standard named in the order.
Tell us the inverter voltage, the grid voltage you are connecting to and the total inverter capacity, and we will come back with a configuration and a schedule.
Send us the specification
Rating, primary and secondary voltage, frequency, quantity and the application. We answer within one working day.
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