ABB Transformer unit- dry type transformer ABB MV Products

Product Description

DRY TYPE TRANSFORMERS

Here are various types of electrical devices or components available where some of them operate with the same frequency although the transformer is required for different voltage otherwise current requirements. The main function of a transformer in an electrical circuit is to increase or decrease currents/voltages. There are different types of transformers available in the market but the Dry Type Transformer is recommended due to some benefits as inexpensive, more efficient and they have safety features. These transformers also called cast resin type transformers. These kinds of transformers are applicable in indoors otherwise outdoors like a commercial, utility, industrial applications.

IMPORTANT FACTORS

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
• WindingMaterial Selection
• Regulation
• K-factor
• Overloading

TESTING

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

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