3750 kVA Oil-Immersed Distribution Transformer

3750 kVA Oil-Immersed Distribution Transformer is specified for 3750 kVA (Matches ~3 MW Inverters) oil-immersed distribution service. It steps 11kV / 22kV / 33kV networks to 600V / 690V (Typical for VFD/Solar) loads. It uses ONAN / ONAF cooling. Engineering details address engineered for Non-Linear Industrial Loads, construction, application context, and electrical data for project selection.

Engineered for Non-Linear Industrial Loads

For this 3750 kVA rating, engineered for non-linear industrial loads affects how the transformer is selected, protected, and operated in the field.

• Is a specialized capacity rating, frequently selected to match the specific output profiles of 3.0 MW solar inverters or large-scale variable frequency drives (VFDs).
• Unlike standard distribution units, this model is engineered to survive the "dirty power" environments typical of modern heavy industry.
• As a heavy-duty transformer oil immersed type, it is constructed to handle high harmonic distortion without overheating.
• While standard transformers are rated for linear loads (K-1), this rating can be customized to K-Factor ratings (K-4, K-13), ensuring the core and coils do not suffer from premature insulation failure caused by harmonic eddy currents.

Electrostatic Shielding Technology

The electrostatic shielding technology details below highlight design choices that matter during continuous distribution service.

• When powering sensitive electronics or connecting grid-tied inverters, preventing high-frequency noise transfer is critical.
• The Shield: We install a grounded Electrostatic Shield (a copper sheet) between the Primary and Secondary windings.
• The Function: This acts as a capacitive barrier, filtering out high-frequency transient spikes from the grid and preventing common-mode noise from damaging downstream equipment.
• This feature is standard protocol for any transformer oil immersed type used in renewable energy applications.
• Grounding point for electrostatic shield on 3750 kVA oil immersed transformer.

Cooling & Tank Construction

These cooling and tank construction points connect the electrical rating with grid conditions, downstream equipment, and maintenance expectations.

• At 3750 kVA, the thermal load is significant.
• The tank structure abandons the corrugated design entirely in favor of Detachable Radiator Banks with separate headers.
• ONAF Efficiency: this rating is almost always paired with ONAF (Fan) cooling.
• By activating the fans, the unit can handle temporary overloads (e.g., peak solar generation hours) of up to 4500 kVA without degrading the oil life.
• Gasket Protection: All flange connections use nitrile rubber (NBR) or cork-rubber gaskets housed in machined grooves to prevent leakage even under extreme thermal cycling.

Typical Application Context

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

• This capacity is rarely used for general building power.
• It is specific to: Solar PV Farms: Operating as a Step-Up transformer (0.69kV / 33kV) to connect large central inverters to the grid.
• Steel Mills: Powering the drive systems for rolling mills where current waveforms are heavily distorted.
• Marine & Offshore: Used as a shore-to-ship power supply transformer where customized voltages (e.g., 6.6kV or 60Hz conversion) are required.

Electrical and Mechanical Data

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

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