Dry Type Transformer Applications

Dry-type transformer is a completely stationary solid-state device and it needs less maintenance to provide problem-free service. This transformer doesn't contain any moving parts. Not like liquid fill transformers, this transformer use simply high-temperature insulation systems as they are very safe environmentally. These transformers give a secure and consistent power source that doesn’t need fire-resistant vaults, the emitting of toxic gasses otherwise catch basins. These safety factors will allow these transformers to install in different applications where fire safety is required like schools, buildings, hospitals, factories, chemical industries.

Important Factors in Designing Dry Type Transformer

There are many important factors need to consider while designing this type of transformer, they are

Selection of Type of Insulation
Expectancy of Life
Core Material Selection with Less Hysteresis Loss
Level of Insulation
Losses
Winding Material Selection
Regulation
K-factor
Overloading

Testing of Dry Type Transformer

In this transformer, insulation breakdown is the most frequently occurred failure which results in severe faults like earth faults or phase-phase winding. Based on the tests only the condition of insulation for the component parts in the transformer like core, windings, and bushings can be determined. In oil type transformer, the condition of winding insulation can be determined by using the common method like dissolved gas analysis but it cannot be achievable in dry-type transformers. There are different tests that include the following.

Tests for partial discharge
Insulation resistance tests
Analysis of frequency response
Polarization index tests
Thermographic surveys
Measurement tests for dielectric loss angle
Acoustic emission tests

Advantages of Dry Type Transformer

The advantages are

It is pollution-free
These are used in the areas of contaminated and damped
Installation is simple
They are long last because of the dielectric heating & low thermal
Protects the property & people
For short circuit currents, they have high resistance
Low Side clearance
Performance is excellent
Capacity is high to support overloads

Disadvantages of Dry Type Transformer

The disadvantages are

These transformers are expensive
Maintenance is difficult
When the coils of the transformer are not properly cleaned then they can cause fire risks
Maintenance of these devices needs deactivation & downtime.
Electrical losses in these transformers are extensively higher.
A cooling system must be required to control the losses which are generated by heat.
Operating noises are high so they are not applicable in some indoor applications.

Applications of Dry Type Transformer

The applications are

They are used in different industries like gas, chemical, and oil
These are used in water protection areas which are sensitive environmentally
Forests
Used in substations of inner cities
Substations like indoor as well as underground
Renewable generation

Frequently Asked Questions about Dry Type Transformer

Q: What is the difference between dry type and oil type transformer?

A: As the cooling medium, dry type transformer uses air whereas the oil type uses oil

Q: How do you test a dry-type transformer?

A: The transformer testing can be done by measuring the resistance of winding, voltage ratio, phase displacement, load loss, etc.

Q: Which oil is filled in a transformer?

A: Insulating oils are filled due to high insulating properties.

Q: Why is the oil used in a transformer?

A: Transformer oil is used for protecting the core & winding of the transformer because they are completely immersed within the oil.

Q: What is DGPT in a transformer?

A: DGPT is the detection of gas, pressure & temperature for the transformers.
Thus, this is all about an overview of dry type transformer. Compare with other transformers, these are best due to these reasons like size, insulation, risk of fire, maintenance, and cost of installation. Here is a question for you, what are the features of this transformer?

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