20KV Three Phase Oil-immersed Distribution Transformers

In comparison to the 10kV class, the 20kV three-phase oil-immersed distribution transformer offers several advantages:

• Enhance power supply capacity
• Maintain voltage quality
• Reduce energy losses in the power system, among other benefits.

Additionally, it helps lower the construction costs of power systems and serves as an energy-efficient solution for modern power systems.

• The low-voltage windings typically use a cylindrical structure made of copper foil, except for small-capacity designs that use copper wires. High-voltage windings adopt a multi-layer cylindrical structure, ensuring an even distribution of ampere-turns, reduced magnetic leakage, and high mechanical strength, providing strong resistance to short circuits.
• The iron core and windings are securely fastened, with components such as device height adjustments and low-voltage leads equipped with self-locking nuts. A suspended core structure is used, allowing the transformer to withstand transportation shocks.
• Both the coil and iron core are vacuum-dried, while transformer oil undergoes vacuum filtration and injection to minimize internal moisture levels.
• The oil tank features corrugated sheets with a "breathing" function, compensating for oil volume changes due to temperature fluctuations. By replacing the traditional oil conservator, the corrugated sheets isolate the transformer oil from external air, effectively preventing oxygen and moisture ingress, which could degrade insulation performance.
• These design features ensure that the transformer requires no oil replacement during normal operation, significantly reducing maintenance costs and extending its service life.

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