Solar
Solar Farm Transformer Guide
By Ziyao Engineering Team•2026-05-22•14 min
Solar Farm Transformer Overview
Solar farms require specialized step-up transformers to connect PV inverters to the grid. Common configurations include pad-mounted oil-immersed transformers (S22-M, S13-M) rated 500-5000kVA with dual-voltage taps for inverter-side harmonics.
Key Selection Factors
- Voltage ratio: 0.4kV/0.8kV (LV) to 10kV/35kV (MV)
- Cooling: ONAN for outdoor installation
- K-factor rating: For harmonic-heavy inverter output
- Standards: IEC 60076, IEEE C57, grid codes
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