How to extend the service life of dry-type transformer?

dry-type transformer (DTT) is a type of transformer that does not use oil as a cooling and insulating medium, but instead uses solid materials such as epoxy resin, silicone rubber, or nomex paper. Dry type transformers are widely used in applications where safety, environmental protection, and low maintenance are required, such as urban areas, industrial plants, hospitals, schools, and renewable energy sources. In this article, we will discuss the advantages of dry  transformers, how long they can last, and how to maintain them properly.

• What are the advantages of dry-type transformers?

• How long can you use dry-type transformers?

• How to maintain dry-type transformers?

What are the advantages of dry-type transformers?

1. Fire safety: DTTs do not have flash points or flammable liquids, so they reduce the risk of fire and explosion. They also do not need fire suppression systems or special fire protection measures.

2. Environmental friendliness: DTTs do not contain oil or other hazardous substances that could leak or spill and contaminate the soil or water. They also have lower noise levels and lower losses than oil-filled transformers.

3. Cost-effectiveness: DTTs have lower installation costs and lower total cost of ownership than oil-filled transformers. They do not require oil testing, oil treatment, or oil replacement. They also have longer service life and higher reliability than oil-filled transformers.

How long can you use dry-type transformers?

The service life of DTTs depends on several factors, such as the quality of the materials, the design of the transformer, the operating conditions, and the maintenance practices. Generally speaking, DTTs can last for more than 30 years if they are well maintained and operated within their rated parameters. However, some factors can shorten the service life of DTTs, such as:

1. Overloading: DTTs are designed to operate at a certain load level and temperature range. If they are overloaded or overheated for a long time, they can suffer from thermal aging and mechanical stress, which can damage the insulation and reduce the dielectric strength.

2. Moisture: DTTs are sensitive to moisture ingress, which can affect the insulation properties and cause partial discharge or breakdown.

3. Dust: DTTs are exposed to dust accumulation, which can reduce the cooling efficiency and increase the temperature rise.

How to maintain dry-type transformers?

1. Regular inspection: DTTs should be inspected periodically to check for any signs of damage, deterioration, or abnormality. The inspection should include visual inspection of the external condition, electrical tests of the insulation resistance and winding resistance, and thermal imaging of the hot spots.

2. Proper cleaning: DTTs should be cleaned regularly to remove any dust or dirt that may affect the cooling performance or cause electrical faults. The cleaning should be done with a soft brush or a vacuum cleaner with a low suction power.

3. Optimal environment: DTTs should be installed in a clean, dry, and well-ventilated place that is free from corrosive gases, liquids, or vapors. The ambient temperature and humidity should be within the specified limits. The transformer should also be protected from direct sunlight, rain, snow, or mechanical impact.

dry-type transformers are a safe, eco-friendly, and cost-effective alternative to oil-filled transformers. They have many advantages such as fire safety, environmental friendliness, and cost-effectiveness. They can last for more than 30 years if they are well maintained and operated within their rated parameters.