20000 kVA Oil-Immersed Distribution Transformer

20000 kVA Oil-Immersed Distribution Transformer is specified for 20,000 kVA (20 MVA) oil-immersed distribution service. It steps 33kV / 66kV networks to 6.6kV / 11kV / 33kV loads. It uses ONAN / ONAF (Radiators detachable) cooling. Engineering details address the Apex of Distribution Engineering, construction, application context, and electrical data for project selection.

The Apex of Distribution Engineering

For this 20000 kVA rating, the apex of distribution engineering affects how the transformer is selected, protected, and operated in the field.

• Stands at the very top of the distribution power hierarchy.
• Capable of powering entire residential districts or heavy metallurgical complexes, this 20 MVA unit is engineered for maximum reliability and thermal efficiency.
• Among the wide range of standard oil filled transformer sizes, the 20 MVA model represents the critical threshold between distribution and transmission classes.
• At this scale, manufacturing precision is paramount.
• The design uses a "Bell-Type" tank construction or a reinforced rigid cover design to ensure the unit maintains its structural integrity during the complex logistics of moving a 40+ ton asset to the site.

Stray Loss Control & Tank Shielding

The stray loss control and tank shielding details below highlight design choices that matter during continuous distribution service.

• In a unit of this magnitude, the leakage magnetic flux is substantial.
• If left unmanaged, this flux causes eddy currents in the steel tank walls, leading to localized overheating and paint damage.
• To counter this, the transformer oil immersed type features an advanced Internal Shielding System: Magnetic Shunts: We line the interior tank walls with packets of high-permeability silicon steel.
• The Function: These shunts capture and channel the stray flux safely back to the core, preventing it from entering the tank steel.
• This technology significantly reduces "Stray Losses," ensuring the tank surface temperature remains cool and compliant with IEC standards even under full load.

Logistics & Impact Monitoring

These logistics and impact monitoring points connect the electrical rating with grid conditions, downstream equipment, and maintenance expectations.

• Transporting a 20,000 kVA unit requires meticulous planning due to its sheer mass and dimensions.
• Transport Profile: To fit within standard road height limits, the bushing turrets and conservator are often designed to be demountable.
• Shock Logging: Every unit is shipped with a tri-axial Impact Recorder (Shock Log).
• This device records any G-force shocks during transit (e.g., sudden braking or dropping).
• 1 Upon arrival, the data is downloaded to verify that the active part has not shifted, providing the client with verifiable proof of delivery quality.

Typical Application Context

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

• City Main Substation (66/11kV): Acting as the primary step-down transformer feeding a network of 11kV ring main units (RMUs) for a city zone.
• Steel Arc Furnaces (EAF): Designed with a robust core-clamp structure to withstand the violent mechanical vibrations and current surges typical of steel melting operations.
• Hyperscale Data Centers: The main "N+1" incoming transformer for campuses exceeding 30MW total power consumption.
• 20000 kVA utility-scale oil immersed transformer operating in a main grid substation.

Electrical and Mechanical Data

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

Product Detail Images