3000 Kva Oil-filled Transformer

The 3000 kVA Oil Immersed Transformer marks the entry point into the "Medium Power" category. While it can be configured for general distribution, it is predominantly engineered for specialized industrial applications where standard low-voltage limits are exceeded.

As a premium dielectric liquid filled transformer, this unit is designed to handle high-flux density operation. Unlike smaller distribution units that rely on corrugated elasticity, 3000 kVA units typically feature a rigid, non-expanding tank structure coupled with an external Conservator Tank. This architecture allows for the stable management of the large volume of dielectric fluid (approx. 2000+ liters) expanding under heavy loads.

Since the keyword is "Dielectric Liquid", we offer flexibility beyond standard mineral oil. For projects requiring high fire safety (e.g., indoor industrial substations or offshore platforms), this dielectric liquid filled transformer can be retrofilled with Synthetic or Natural Esters (K-Class fluids).

• Fire Point: Esters have a fire point >300°C, compared to ~170°C for mineral oil.
• Moisture Management: The conservator system is equipped with a Silica Gel Breather or a maintenance-free Rubber Bag (Air Cell) inside the conservator. This isolates the liquid from direct air contact, preventing oxidation while allowing the fluid to "breathe" into a separate expansion chamber.

At 3 MVA, managing current is the primary engineering constraint.

• 690V Industrial Standard: To keep currents manageable (~2500A), many 3000 kVA units are wound for 690V secondary output. This is the standard for wind turbine step-up units and large industrial variable speed drives (VSD).
• The 400V Challenge: If 400V output is strictly required, the current surges to approx. 4330 Amps. In this scenario, the LV termination is engineered exclusively with a multi-flange Busbar Throat, designed to mate with high-rating Copper Busducts, as cabling is physically impractical.

Standard features for a unit of this magnitude include:

• Buchholz Relay: Installed in the pipe between the main tank and conservator, specifically to detect gas accumulation (minor faults) or oil surges (major faults).
• Magnetic Oil Level Gauge (MOG): A dial-type gauge mounted on the conservator for ground-level visibility.

• Renewable Energy: Step-up transformers for 2.X MW wind turbines (690V/33kV).
• Petrochemical Plants: Powering large 690V or 3.3kV pumps and compressors.
• Data Centers: Dedicated MV/LV units for server halls requiring N+1 redundancy.

3000 kVA oil immersed transformer installed in a petrochemical

plant powering pumps.