Oil-immersed transformers (ONAN or ONAF cooling) are the standard for large-scale solar farms. These transformers can handle high-capacity and variable loading efficiently, and their thermal performance holds up well to the daily cycling that solar sites put equipment through.
oil immersed distribution transformers
convert MV to LV at same frequency, used for renewable energy and industrial applications.
sustainability advantages:
Varelen's distribution transformers are designed for decentralized energy systems and industrial environments and more than just traditional distribution power grids. Built with high-grade core and coil assemblies, vacuum drying technology, and advanced insulating liquids, they deliver excellent thermal performance, low noise, and high efficiency. Available as liquid-immersed units or cast resin dry-type transformers, they are ideal for renewable power feed-in, industrial drives, and smart grid applications, they ensure reliable and efficient energy distribution.
Standard distribution transformers are not rated for the unique duty cycles of solar energy. Solar grids experience daily power cycles, high DC bias, and harmonic distortions from inverters. Varelen’s solar power transformers are custom-engineered with heavy-duty windings and electrostatic shielding to handle these specific electrical stresses without overheating.
We design and manufacture medium-voltage step-up solutions tailored to your local grid requirement. Our primary product lines support input voltages directly from solar inverters (ranging from 315V to 800V) and step up to distribution levels including 11kV, 22kV, 33kV, and 35kV systems under international standards.
To resolve the harmonic issues generated by PV inverters, Varelen utilizes a specialized split-winding design (dual-low voltage windings). This physical separation isolates the harmonic interactions between multiple inverter inputs, significantly reducing wave distortion and ensuring stable, clean power output to the main utility grid.
