500 kVA Oil-Immersed Distribution Transformer

500 kVA Oil-Immersed Distribution Transformer is specified for 500 kVA oil-immersed distribution service. It steps 6.3kV / 11kV / 33kV networks to 400V / 415V (Line-to-Line) loads. It uses ONAN cooling. Engineering details address industrial-Grade Power Stability, construction, application context, and electrical data for project selection.

Industrial-Grade Power Stability

For this 500 kVA rating, industrial-grade power stability affects how the transformer is selected, protected, and operated in the field.

• Serves as the backbone for medium-scale industrial operations and critical infrastructure.
• We understand that reliability is paramount at this capacity.
• Therefore, every 500 kva transformer we manufacture undergoes a rigorous "heat run test" (Temperature Rise Test) simulation.
• This ensures that even under full load conditions at high ambient temperatures (up to 40°C or 50°C), the internal windings remain within the strict IEC 60076 temperature limits (Top Oil: 60K, Winding: 65K).

Superior Thermal Management

The superior thermal management details below highlight design choices that matter during continuous distribution service.

• The longevity of an oil immersed system is directly linked to its cooling efficiency.
• For the 500 kVA model, the design uses an optimized corrugated fin configuration with increased surface area depth.
• Fluid Dynamics: The tank design promotes a natural thermosiphon effect, accelerating the circulation of the insulating oil.
• This rapid flow efficiently transfers heat from the active core to the tank walls.
• Corrosion Resistance: The cooling fins are not just functional.

Protection and Safety Features

These protection and safety features points connect the electrical rating with grid conditions, downstream equipment, and maintenance expectations.

• As capacity increases, so does the need for protection.
• The 500 kVA unit is designed to accommodate advanced monitoring devices that are often optional on smaller sizes: 1.
• Pressure Relief Device: Equipped with a distinct pressure relief valve (PRV) that can be fitted with alarm contacts to trip the upstream breaker in case of internal pressure surges.
• Gas Actuated Relay (Buchholz) Ready: The tank cover is designed with the necessary flange to accept a Buchholz relay (optional upon request), providing double-layer protection against gas accumulation and oil flow surges.

Ideal Application Scenarios

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

• This robust 500 kva transformer is specifically tailored for: Manufacturing Plants: Supplying 400V power to assembly lines, injection molding machines, and compressors.
• Mining Operations: Providing reliable auxiliary power for ventilation and lighting in surface mining sites.
• Hospital Backups: Functioning as an isolation transformer for critical backup generators.
• 500 kVA oil immersed transformer powering a heavy industrial manufacturing plant.

Electrical and Mechanical Data

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

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