What is safety of dry type transformer?

Dry-type transformers, unlike conventional liquid transformers, are not required to be kept inside catch basins or fire resistant vaults, and no toxic gases are released from them. As dry-type transformers are highly safe, they can be installed indoors as well as nearby loads, making the whole system more competent.

What are the main advantages of dry type transformer?

The main advantages of dry type transformer are given below.

• Safety for people and property.
• Maintenance and pollution-free solution.
• Easy installation.
• Side clearance is less.
• Environmentally friendly.
• Excellent capacity to support overloads.
• Reduced cost on civil installation works and fire protection systems.

What are the rating should specified for a transformer?

That’s why the transformer is generally specified with apparent power rating (VA or kVA) and not in kW. Lets us take an example, a transformer working on rated voltage and rated current with load power factor equal to zero; as load power factor is zero, it will deliver zero power to load, but it has rated kVA output.

Is standard for dry type transformer?

The IS 11171:1985 is the present standard for the Dry type transformers in India. This standard is derived from the IEC 726 1982, subsequently the ICE was called the IEC 60076-11 the 60076 series. The second most important aspect for the use of Dry type transformers is the energy efficiency.

What are the cooling methods of a dry type transformer?

The cooling methods of dry type transformer are divided into natural air cooling (AN) and forced air cooling (AF). When in the condition of natural air cooling, dry type transformer can be operated long-term continuously under the rated capacity.

Do you need clearance around a dry type transformer?

However, proper clearances need to maintained around the Dry Type Transformer for cooling purposes and maintenance. Indoor installations for Less Flammable liquid filled transformers(fire point not less than 300°C) have several options. Refer to Table I.

Which is better liquid or dry voltage transformers?

Due to a number of advantages Dry Type Medium Voltage Transformers became the preferred choice for most indoor and some outdoor installations. As a result of the development of the “less Flammable” Liquid filled transformers, a comprehensive comparison between Liquid filled transformers and Dry Type Transformers seems to be in order.

How does a self cooled transformer get its rating?

The self cooled rating (A) is obtained by Natural Circulation of air over the tank and cooling surfaces. Liquid-immersed, forced liquid-cooled with forced air-cooled. This transformer normally has only one rating. The transformer is cooled by pumping oil (forced oil) through a radiator normally attached to the outside of the tank.