S13-M-400kVA 10/0.4kv Energy Efficient Oil-Immersed Distribution Transformer

Uses transformer oil as cooling and insulating medium with thermal conductivity ~6x that of air, rapidly dissipating heat from windings and core for stable high-load operation.

Large thermal capacity enables 150% overload for 2 hours without insulation damage, adapting to heavy loads and frequent start-stop conditions.

High-permeability cold-rolled silicon steel core and pure copper windings deliver no-load and load losses better than national standards, significantly reducing electricity costs over time.

Corrugated tank with fully sealed design isolates oxygen and moisture, preventing oil oxidation and aging. No conservator needed, enabling long-term maintenance-free operation.

Cylindrical winding structure ensures balanced ampere-turns and low leakage flux. Reinforced body with positioning frames withstands short-circuit impacts and transport vibrations.

With proper sealing and minimal insulation paper oxidation, expected service life reaches 30-40 years, offering significant lifecycle cost advantages.

Fully sealed housing suits outdoor, polluted, and high-altitude environments.

10%-30% lower cost than dry-type for equivalent capacity, the economical choice.