20000 Kva Oil-filled Transformer

The 20000 kVA Oil Immersed Transformer 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. We utilize 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.

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, our 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.

Massive banks of heavy-duty detachable radiators on

20000 kVA transformer.

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.

• 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.