Solar Power 75KVA Three Phase Dry Type Voltage Transformer 690V To 400V Step Down

Our 75KVA three phase dry type voltage transformer is purpose built to step down 690V input to a stable 400V output for renewable energy systems, wind turbine auxiliary power, solar PV plants, and industrial grid distribution networks. The SG series design uses a high permeability silicon steel core and high purity copper windings to achieve ≥90% working efficiency, while the oil free dry type construction ensures safe, maintenance free operation in outdoor containers, power rooms, and offshore installations. This voltage transformer provides complete galvanic isolation between the high voltage side and the low voltage side, protecting inverters, converters, and distribution panels from harmonic distortion and fault propagation. It is the preferred solution for EPC contractors, renewable energy developers, and electrical engineers who demand reliable power conversion in grid tied applications.

• High Voltage 690V Input: Accepts 690V three phase input common in wind turbines, marine vessels, and mining grids, stepping it down to 400V for standard industrial distribution and auxiliary loads.
• Grid Connection Stability: ±2% output precision with low impedance design ensures stable voltage under fluctuating renewable generation, protecting downstream equipment and improving power quality at the point of common coupling.
• High Efficiency Performance: Grain oriented silicon steel core and precision windings deliver ≥90% efficiency with low no load and load losses, maximizing the energy yield of solar and wind power plants.
• Superior Insulation Safety: F class insulation passes 3500V high voltage tests and 2500V dielectric strength testing, providing reliable isolation for harsh outdoor and marine environments.
• Rugged IP23 Enclosure: Heavy duty steel enclosure with safety interlocks, high insulation terminals, and corrosion resistant finish protects the transformer in dusty, humid, and saline coastal conditions.
• Flexible Customization: Multi tap windings and customizable output voltages of 400V, 380V, or 220V allow one transformer model to serve diverse regional grid standards and application requirements.

This 75KVA voltage transformer is widely applied in solar PV farms, wind power stations, energy storage systems, marine and offshore platforms, mining sites, and industrial distribution networks where 690V generation or transmission voltage must be converted to 400V utilization voltage. It is also used in containerized power stations, data center backup power rooms, and large commercial buildings connected to medium voltage renewable microgrids. The dry type construction allows compact installation inside electrical rooms and offshore containers without oil containment or fire suppression systems, significantly simplifying project engineering and reducing installation cost.

All units are shipped in reinforced non fumigation plywood cases with internal foam cushioning; the reference packing size is 58X48X85CM with a gross weight of approximately 180KG. Our CE, ISO9001, and UL certified factory applies full process quality control and pre shipment testing, including insulation resistance measurement, turns ratio verification, and temperature rise testing under rated load. We support OEM/ODM customization, offer a minimum order quantity of one set, provide 3 to 10 working days lead time for standard models, and supply lifetime technical support with optional on site commissioning by our engineering team.