What is an oil-immersed transformer?

1. Overview
2. 

Oil-immersed transformer is an electrical device widely used in power systems. It achieves efficient transmission and distribution of electric energy by transforming voltage levels. Compared with dry-type transformers, oil-immersed transformers have better heat dissipation performance and higher load-bearing capacity, and are suitable for high-voltage and large-capacity power transmission occasions.

2. Working principle
3. 

The core components of oil-immersed transformers include iron core and winding. The iron core is made of highly magnetically permeable silicon steel sheets, and the winding is usually made of copper or aluminum coils. When the transformer is working, the primary winding generates magnetic flux through the input voltage, which closes the loop in the iron core and induces the corresponding voltage in the secondary winding. By changing the winding turns ratio, the voltage can be increased or decreased.

3. Structure and composition

The oil-immersed transformer is mainly composed of the following parts:

Iron core: It is made of highly magnetically permeable silicon steel sheets, which reduces hysteresis loss and eddy current loss.

Winding: It is usually wound with copper wire or aluminum wire and is divided into primary winding and secondary winding.

Transformer oil: It plays the role of insulation, heat dissipation and arc extinguishing, and prolongs the service life of the transformer.

Oil tank: It is used to hold transformer oil and is usually welded with steel plates.

Radiator: It dissipates the heat generated by the transformer during operation through natural convection or forced air cooling.

Bushing: It insulates and supports conductive terminals for connecting external circuits.

4. Advantages and applications

Advantages:

High reliability: Oil-immersed transformers operate stably and adapt to various complex power system environments.

Good heat dissipation performance: Transformer oil has good thermal conductivity and heat dissipation, which can effectively reduce the temperature of windings and cores.

High voltage resistance: It is suitable for high-voltage and large-capacity power transmission and is widely used in power substations and power plants.

Application:

Oil-immersed transformers are mainly used in various links in the power system, including power generation, transmission, distribution and power consumption. Specific application scenarios include:

Power plant: Increase the voltage output by the generator to facilitate long-distance power transmission.

Substation: Regulate the voltage of the power grid to ensure the stable transmission and distribution of electric energy.

Industrial enterprises: Provide large-capacity electric energy to meet the power demand of production equipment.