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Advantages and Disadvantages of Immersed-Type Transformers

Advantages and Disadvantages of Oil-Immersed Test Transformers


Oil-immersed test transformers are extensively utilized in power systems, industrial, mining enterprises, and various other sectors.

 Within this category, there are different types such as gas-filled test transformers and dry-type test transformers. Let's explore

 the pros and cons of oil-immersed transformers.


In comparison to dry-type and gas-filled test transformers, oil-immersed test transformers have the same internal windings but 

differ in the insulation material or medium used. Dry-type transformers utilize epoxy resin insulation, offering the advantage of

 being lightweight. However, they have limitations in voltage, with a maximum capacity of only 120kV, and are susceptible to

 fracturing upon impact. Gas-filled transformers, on the other hand, use SF6 gas insulation, providing high accuracy, high voltage

 capacity, lightweight construction, and a relatively higher price point. These transformers are commonly employed as standard 

voltage sources by metrology and testing institutions.


Oil-immersed test transformers utilize oil as the insulation medium, featuring high voltage capacity, large capacity, a sturdy 

metal casing, and a durable outer covering. They are much more cost-effective than dry-type and gas-filled transformers of 

equivalent capacity. Additionally, maintenance of oil-immersed transformers is both affordable and efficient. In case of a fault in

 the cable package, the process involves simply unscrewing the casing screws, draining the insulation oil, replacing the cable

package, and refilling with fresh oil. When it comes to inspecting the transformers, oil-immersed test transformers offer greater

 convenience and speed compared to dry-type and gas-filled variants.


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