Dry Type Transformer

blankHV windings are transformers that are coated with epoxy cast resin under vacuum, while LV windings are transformers that can be made of both cast resin and prepreg.
They are produced in 160-15000 kVA power range, up to 36 kV voltage level, with natural air cooled (AN) or fan cooled (AF) option. (Up to 50% power increase by using cooling fan).

Why Dry Type Transformers?

Epoxy resin cast under vacuum prevents moisture from entering the HV-AG windings and provides protection against harsh and harsh environments. Therefore, it can easily operate in humid and concentrated areas. If it has been out of operation for a long period of time, it does not need to be dried during re-commissioning.
Due to the non-flammable and self-extinguishing properties of the epoxy cast resin coated on the windings, there is no fire hazard and no risk of leakage that could cause environmental pollution. It is therefore safe and environmentally friendly.
Dry-type transformers have the advantage of smaller dimensions compared to oil-type transformers, which means less space and less construction work.
Longer transformer life with low thermal and dialectical aging effect compared to oil-type transformers.
It is more convenient due to its high resistance to short circuits and high capacity to support overload.
It is easy to install and assemble and does not require frequent maintenance.
According to IEC 60076-11;
  • Climatic C1/C2
  • Environment E2
  • Fire F1 standards are met.

Product types and areas of use

  1. Distribution type transformers (160-3150 kVA)
  2. Single-phase single-phase transformers
  3. Power transformers (4000-15000 kVA)
  4. OLTC step-change transformers at load
  5. Rectifier rectifier type transformers
  6. Water and air cooled transformers (for Submarine, Marine and Oil Drilling Platforms)
  7. Wind power wind turbine transformers
  8. It minimizes the risk of combustion and explosion in environments where people live very densely such as subways, tunnels, mines, airports, shopping malls, schools, hospitals, skyscraper buildings.
  9. Optionally, it can be produced as internal and external type enclosure according to IP20, IP23, IP33 protection classes.

Dry Type Transformer Features

A transformer is a system that generally provides electrical energy transfer between two or more circuits by electromagnetic induction. Dry-type transformers are designed to be cooled and are transformers that remove the heat generated by air circulation. Electrical transformers whose magnetic circuit and windings are not protected in an insulating liquid and whose windings are covered with epoxy resin with glass fiber support and completely insulated against external influences. It is completely dry and absolutely oil-free.

The magnetic circuit and windings of dry transformers are not immersed in an insulating liquid, in which case they can operate in gas or under atmosphere. In general, it is a varnish impregnated transformer covered with cast resin. Dry-type transformers differ from oil-type transformers according to the cooling method. Dry-type transformers are smaller in size than oil-type transformers and provide less space and less construction work.

Advantages of Dry Type Transformers

Dry type transformer manufacturing, which requires know-how and advanced technology, has been increasing in recent years and increasing its market share day by day with customer demands compared to oil type transformers. However, in today’s technology, especially the production of large power dry-type transformers above 36kV voltage level involves technological challenges.

Apart from this, there is the absence of an environmentally harmful coolant such as oil, less risk of fire, no need for maintenance, and resistance to moisture and humidity. In addition, it is more preferred for reasons such as trouble-free commissioning at any time and fan cooling reinforcement despite being out of operation for a long time.

Dry-type transformers are the most preferred transformers today because they are generally durable, safe and environmentally friendly. All the materials required for production are offered as the most durable and quietest dry-type transformer in the sector. The dry type transformer cools with natural air and fan cooling. Several fan groups are placed in the transformer sub-area and thus, according to the temperature condition, the fan group is activated to perform cooling.

Dry Type Transformer Maintenance

Periodic maintenance is important for dry-type transformer maintenance and it must be completely de-energized before it can be healthy. For this purpose, the supply voltage is cut by opening the breakers at the transformer input and the disconnector connected after the breaker is opened must also be opened. Safety and security precautions must be taken prior to maintenance of the transformer and in particular the maintenance instruction published by TEDAF in the relevant year must be kept with it.

Dry Type Transformer Sections

It is also important to know its sections when preparing the dry type transformer connection diagram . Dry type transformer sections may vary such as low voltage input, high voltage input, secondary, primary, idle tap changer, magnetic core, magnetic core fixing part, wheel steerable cylinder assembly, earthing input, lifting holes, label plate and spare circuit box. In terms of connection groups, a transformer is a stationary electrical machine consisting of two electrically isolated coils wound on a common core.

Dry Type Transformer Prices

Since dry-type transformer prices are generally very diverse according to their dimensions and usage areas, their prices also vary completely according to these conditions. When we look at the usage areas of dry type transformers , it can be used in many places such as pumping stations, hospitals, schools, commercial buildings, dams, underground substations, railway systems, heat centers, airports, so you need to get the most accurate price information according to the area and features to be used.

Transformers