Oil Immersed Auto-transformer

ZTelec Yuguang Oil-Immersed Autotransformer

An oil-immersed autotransformer is a type of power transformer where part of the winding is shared by both the primary and secondary sides.
It uses transformer oil for cooling and insulation, providing high efficiency, strong overload capacity, and excellent voltage regulation.

As a professional transformer manufacturer, ZTelec Yuguang designs and produces a full range of oil-immersed autotransformers that comply with IEC, GB, and ANSI standards, ensuring stable performance for various power systems.

ZTelec Yuguang Oil-Immersed Autotransformer Advantages 

1. High Efficiency & Low Loss

   Uses advanced silicon steel core and precision winding to minimize no-load and load losses.

2. Excellent Cooling Performance

   Transformer oil provides stable thermal dissipation and insulation, ensuring long service life.

3. Compact and Cost-Effective Design

   Shared winding reduces material consumption and weight compared with double-wound transformers.

4. Stable Voltage Regulation

   Smooth voltage adjustment and strong overload capacity for fluctuating grid conditions.

5. Long Lifespan & Reliable Operation

   Anti-corrosion tank coating, sealed oil conservator, and moisture-proof design.

6. Custom Engineering Available

   ZTelec Yuguang supports OEM & ODM solutions for power companies and EPC contractors.

Structure and Design Features

Core: Cold-rolled grain-oriented silicon steel, step-lap joint structure.

Windings: High-quality oxygen-free copper or aluminum foil winding, impregnated with insulation varnish.

Tank: Corrugated or radiator-type oil tank, welded with anti-leak design.

Oil: Mineral insulating oil or environmentally friendly ester-based oil.

Accessories: Pressure relief valve, Buchholz relay, oil level indicator, temperature sensor, and tap changer.

These designs ensure thermal stability, safety, and maintenance-friendly operation under varying load conditions.

Technical Parameters of Oil-Immersed Autotransformer

The following table lists the typical specifications of ZTelec Yuguang oil-immersed autotransformers. Custom models are available upon request to meet specific voltage or capacity requirements.

*All parameters can be customized according to client requirements for voltage, frequency, cooling, or connection type.*

Installation and Project Cases

ZTelec Yuguang has successfully delivered oil-immersed autotransformers for projects such as:

Each project demonstrates ZTelec Yuguang’s capability in custom engineering, stable performance, and after-sales service.