The difference between forced oil circulation air-cooled transformer and oil invasion air-cooled transformer and self-cooled transformer

Forced oil circulation air-cooled transformer, oil invasion air-cooled transformer and self-cooled transformer are three common transformer cooling methods, which are different in structure and working principle.

For the difference between the two, let's take a look at the table I compiled for you, and you can compare and distinguish it.

Forced oil circulation air-cooled transformer;

It is a cooling method of transformer, which uses oil pump to forcibly circulate cooling oil. In this type of transformer, there are oil circuits inside and outside the winding, oil circulates in the winding and oil system, and the cooling oil returns to the oil tank for cooling through the radiator or cooler to achieve the purpose of cooling.

1. Advantages:

Good heat dissipation effect: By forcibly circulating cooling oil, the temperature of the transformer can be effectively controlled, and the heat dissipation effect is good.

Strong temperature control ability: the oil pump can accurately control the oil flow and heat dissipation speed, so that the transformer can still maintain a stable temperature under high load.

Suitable for large transformers: Because of the good heat dissipation effect, forced oil circulation air-cooled transformers are usually used for high-power transformers and high-load operation occasions.

2. Disadvantages:

High energy consumption: due to the need to use oil pump for forced circulation, this will generate additional energy consumption.

High maintenance cost: the maintenance and overhaul of additional equipment such as oil pump requires extra work and cost.

Oil invasion of air-cooled transformer;

It is another common cooling method of transformer, which uses natural convection and radiation to transfer heat to the surrounding environment for heat dissipation. This kind of transformer contains cooling oil channel inside, but there is no oil pump. Heat is transferred to the surrounding air through the radiator and dissipated by natural convection.

1. Advantages:

Lower energy consumption: Compared with forced oil circulation air-cooled transformer, oil-immersed air-cooled transformer does not need oil pump, so the energy consumption is lower.

Simple structure: Compared with forced oil circulation air-cooled transformer, oil-immersed air-cooled transformer has relatively simple structure and low maintenance cost.

Suitable for small and medium-sized transformers: oil-immersed air-cooled transformers are usually suitable for small and medium-sized transformers, especially in the case of low ambient temperature or light load.

2. Disadvantages:

The heat dissipation effect may not be as good as that of forced oil circulation air-cooled transformer: compared with forced oil circulation air-cooled transformer, the heat dissipation effect of oil-immersed air-cooled transformer may be worse, especially in high-power transformer.

Self-cooled transformer:

It is a cooling method that does not use cooling oil, and directly uses the iron core and winding of the transformer to conduct heat. The self-cooling transformer dissipates heat through natural convection and radiation, and no additional cooling medium is needed. This kind of transformer is suitable for small transformers and low-power transformers with relatively low heat dissipation requirements.

1. Advantages:

Low energy consumption: the self-cooling transformer does not need additional cooling medium, so the energy consumption is low.

Simple structure: Since there is no need for oil pump and other equipment, the self-cooling transformer has simple structure and low maintenance cost.

2. Disadvantages:

Limited heat dissipation capacity: Compared with forced oil circulation air-cooled transformers and oil invasion air-cooled transformers, self-cooled transformers have limited heat dissipation capacity and are suitable for small transformers and low-power transformers.

When selecting forced oil circulation air-cooled transformer, oil invasion air-cooled transformer or self-cooled transformer, the following aspects can be considered:

Transformer power and load: High-power transformers usually need stronger heat dissipation capacity, so forced oil circulation air-cooled transformers may be a more suitable choice. Small and medium-sized transformers or low-load transformers can consider oil-immersed air-cooled transformers or self-cooled transformers.

Environmental conditions: Environmental temperature and humidity have an important influence on the heat dissipation effect of transformer. If the working environment temperature is high, especially in high temperature season or confined space, forced oil circulation air-cooled transformer may be more suitable to ensure sufficient heat dissipation effect.

Maintenance cost and reliability: Forced oil circulation air-cooled transformer may need more maintenance workload and cost because it involves additional equipment such as oil pump. In contrast, the maintenance cost of oil-immersed air-cooled transformer and self-cooled transformer is relatively low. In addition, the self-cooling transformer has higher reliability because it has no moving parts.

Cost consideration: Forced oil circulation air-cooled transformer usually needs additional oil pump and control system, so the cost is relatively high. Oil-immersed air-cooled transformers and self-cooled transformers do not need these additional equipment, so the cost is low.