A dry-type transformer is a type of transformer that does not use a liquid cooling medium, such as oil, between the windings and the core. They use solid insulating materials, such as insulating paper and insulating plywood, to form an insulating layer around the insulating windings. Dry-type transformers are widely used in indoor environments such as commercial buildings, industrial facilities, and underground distribution stations, as well as in places where liquid leakage needs to be prevented. Here's how a dry-type transformer works:
Working principle of dry-type transformer:
1. Insulation and winding: The windings of the dry-type transformer are wrapped with insulating paper and insulating plywood to prevent electrical short circuits between the windings and between the windings and the core. Insulating materials provide the necessary electrical isolation and insulation.
2. Windings and iron core: The windings of dry-type transformers are wound on the iron core, which helps to enhance magnetic field transmission and improve energy conversion efficiency. Compared with liquid-cooled transformers, the windings of dry-type transformers require better heat dissipation design to ensure that the temperature does not rise too high.
3. Air cooling: Since there is no liquid cooling medium, dry-type transformers use air for natural cooling. This means that the transformer must have sufficient heat dissipation surface to transfer the generated heat to the surrounding air. Some dry-type transformers may also be equipped with fans or ducts to enhance cooling.
4. Turns ratio and voltage transformation: The working principle of dry-type transformer is similar to other transformer types. When an alternating current passes through the input winding, the generated magnetic field induces an electromotive force in the output winding, thereby achieving voltage conversion.
5. Insulation requirements: Since there is no liquid cooling medium to provide isolation, dry-type transformers need to use insulating materials and insulating structures to ensure electrical isolation between windings as well as between windings and iron cores. This helps prevent electrical failures and fires.
6. Environmentally friendly: Dry-type transformers are more environmentally friendly than liquid-cooled transformers because they do not create the risk of liquid leakage and environmental pollution.
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