3000 kVA Oil-Immersed Distribution Transformer

3000 kVA Oil-Immersed Distribution Transformer is specified for 3000 kVA (3 MVA) oil-immersed distribution service. It steps 11kV / 33kV networks to 690V (Preferred) / 400V / 3.3kV loads. It uses ONAN / ONAF cooling. Engineering details address transition to Medium Power Engineering, construction, application context, and electrical data for project selection.

Transition to Medium Power Engineering

For this 3000 kVA rating, transition to medium power engineering affects how the transformer is selected, protected, and operated in the field.

• 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 rating 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.

Liquid Preservation & Safety Options

The liquid preservation and safety options details below highlight design choices that matter during continuous distribution service.

• 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.

Voltage & Current Configurations

These voltage and current configurations points connect the electrical rating with grid conditions, downstream equipment, and maintenance expectations.

• 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.
• 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.

Protective Accessories

These protective accessories points connect the electrical rating with grid conditions, downstream equipment, and maintenance expectations.

• 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.

Typical Application Sectors

Application guidance links the transformer rating with the substations, industrial loads, and site conditions where it is normally used.

• 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.

Electrical and Mechanical Data

The electrical data summarizes the main values needed for project comparison and project comparison.

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