Reduced Current Density
Conductors are sized with conservative current densities to account for stray eddy current losses caused by high-order harmonics, preventing hot-spot temperature rise.
Solar and Wind Inverter Duty Transformers (also known as Converter Duty Transformers) provide critical isolation and step-up voltage transformation between renewable power conversion equipment and the high-voltage utility grid. Unlike standard distribution units, these transformers operate under non-sinusoidal voltage profiles characterized by high harmonic content from IGBT-based inverters and variable environmental loading.
At Synergy Transformers, our engineering team custom-designs multi-winding secondary configurations (Dy11, Dy11y11, Dy11y11d11) with electrostatic grounding shields between primary and secondary windings. This prevents high-frequency common-mode noise and DC components from injecting into the grid, extending equipment life and maximizing power generation throughput.
Every unit is optimized for site-specific ambient conditions, elevation, seismic rating, and inverter switching frequency.
| Design Parameter | Solar Inverter Duty Transformer | Wind Turbine Converter Transformer |
|---|---|---|
| Power Rating Envelope | 250 kVA to 8340 kVA (8.34 MVA) | 1000 kVA to 6300 kVA |
| Primary Voltage (Grid Side) | 11 kV, 22 kV, 33 kV (Custom HV up to 33 kV class) | 11 kV, 22 kV, 33 kV |
| Secondary Voltage (Inverter Side) | 200 V to 1000 V (Dual / Triple / Quad LV inputs) | 690 V to 1100 V (Single or Dual LV input) |
| Harmonic Mitigation / K-Factor | Designed for THD up to 5% & K-Factor K-4 to K-13 rating | Designed for high dv/dt switching & low flux density |
| Vector Group Options | Dyn11, Dy11y11, Dy11y11d11, Dy0y0y0 | Dyn11, Dy11y11, Dyn0d11 |
| Winding Conductor & Insulation | High-grade Electrolytic Copper or Foil-Wound Aluminium | Enamelled / Paper-covered Electrolytic Copper |
| Inter-Winding Shielding | Earthed copper electrostatic shield between HV & LV | Earthed copper electrostatic shield between HV & LV |
| Cooling / Insulation Medium | ONAN / ONAF Mineral Oil (KNAN Synthetic Ester optional) | ONAN / ONAF Mineral Oil or Cast Resin Dry-Type |
| Applicable Standards | IEC 60076, IS 2026, IS 1180, IEEE C57.18.10 | IEC 60076, IS 2026, EN 60076 series |
Engineered to prevent overheating, core saturation, and dielectric breakdown under continuous solar and wind cycling.
Conductors are sized with conservative current densities to account for stray eddy current losses caused by high-order harmonics, preventing hot-spot temperature rise.
By designing core stacks with reduced magnetic flux density, our transformers avoid core saturation during inverter over-voltage transients and reduce no-load losses.
A continuous copper electrostatic shield connected to ground is placed between primary and secondary windings to decouple capacitive noise and protect grid power quality.
Robust tank mechanical construction, vacuum pressure oil impregnation, and tropicalized anti-corrosive coatings guarantee dependable performance in harsh desert or offshore conditions.
Every solar and wind inverter duty transformer built at our 103,500+ sq. ft. Rajkot facility undergoes a complete series of routine tests according to IEC 60076 and IS 2026 before dispatch authorization.
We regularly supply utility-scale solar PV developers and EPC contractors across Africa, the Middle East, South Asia, and Latin America. Packages include complete technical dossiers:
• GA & Electrical Schematic Drawings
• Guaranteed Technical Particulars (GTP)
• Type Test Certificates & Routine Test Reports
• Seaworthy Export Packing & Nitrogen Flushing
Integrated kiosk housing VCB/RMU switchgear, inverter duty transformer, and LV panel for turnkey renewable site power.
Main step-up power transformers for utility pooling substations connecting solar/wind plants to transmission grids.
Fire-safe, environmentally friendly dry-type inverter transformers ideal for indoor solar plant buildings and wind nacelles.
Inverter duty transformers are specifically optimized to withstand non-sinusoidal voltage waveforms, high Total Harmonic Distortion (THD), and fast transient pulse-width modulation (PWM) switching from solar inverters or wind turbine converters. They feature electrostatic copper shielding between windings, lower magnetic flux density to limit core saturation, and enhanced thermal capacity to handle harmonic eddy currents without overheating.
We manufacture multi-winding secondary transformers including 3-winding (Dy11y11) and 4-winding (Dy11y11d11) configurations. This allows two, three, or four separate inverter outputs to connect into a single step-up transformer, significantly reducing site footprint, cabling complexity, and overall balance-of-plant costs for utility-scale solar farms.
Our solar and wind inverter duty transformers comply fully with IEC 60076 series, IS 2026, IEEE C57.18.10, and ANSI standards. Routine testing is performed on 100% of manufactured units in our ISO 9001 certified laboratory before dispatch.
Yes. Overseas EPC contractors, project consultants, and utility inspectors are welcome to witness routine, special, and type tests directly at our factory in Rajkot, India. Alternatively, we regularly host third-party inspection agencies such as SGS, Bureau Veritas, TÜV, and Intertek.