1. What is a dry-type transformer?

A dry-type transformer is a transformer that never uses any insulating liquid, and its windings or core are immersed in the liquid. Instead, the windings and core are kept in a sealed tank pressurized with air.

2. What are the uses of dry-type transformers?

Dry type transformer

Dry-type power transformers are traditionally used in low and medium voltage applications in buildings. Improved safety makes dry-type transformers the recommendation for indoor power distribution. However, these systems have some disadvantages and limitations.

YD series oil-immersed test transformer
3. What is the difference between dry-type and oil-type transformers?

The dry type uses air as the cooling medium, and the liquid cooling uses oil. Oil-immersed transformers have a higher standard energy efficiency and therefore have a higher service life than dry-type transformers. Noise: Oil-cooled transformers operate at a lower sound level and therefore cause less noise pollution than dry-type transformers.

4. Why can’t dry-type transformers be overloaded?

Why can’t dry-type transformers be overloaded? ANSWER: An overloaded transformer can lead to overheating. This excessive temperature can lead to overheating, which can lead to rapid deterioration of the insulation and complete failure of the transformer coils.

5. What is cast resin dry-type transformer?

In cast resin dry-type transformers, the primary and secondary windings are fully encapsulated in epoxy, which prevents moisture from penetrating the windings. Casting resin provides excellent protection against adverse environmental conditions. These transformers can operate in 100% humidity without interruption of service.

6. What is the iron core of a dry-type transformer made of?

How does the transformer work? A typical transformer has several secondary windings or coils of insulated wire wound around a laminated steel core. When voltage is introduced into a coil called the primary, it magnetizes the core.

7. How to test dry-type transformers?

Below is a list of routine tests performed on dry-type transformers:

Measurement of winding resistance.

The measurement of the voltage ratio.

Check the phase shift.

Measure the short-circuit impedance and load loss.

Measurement of no-load loss and current.

8. What is oil-immersed transformer?

A transformer in which the magnetic circuit and windings are immersed in oil. Oil-type transformers are used in power distribution or substations. Their cores and coils are soaked in oil, which cools and insulates.

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