Hermetically Sealed Transformer
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Hermetically Sealed Transformer
The hermetically sealed oil transformers are normally manufactured with a sealed tank equipped with fins that allow the expansion at the temperature variations. The tightness of the tank is up to 0.5 Bar. This type of transformer is the most widely used in the world. In the hermetically sealed transformer, the oil does not come into contact with the air and its electrical properties are therefore not compromised, ensuring a long life span of the transformer. For powers exceeding 3150kVA, or in case of a transformer with radiators, the transformer can still be hermetically sealed by means of a nitrogen cushion.
Hermetically sealed transformers are totally maintenance free and are particularly suited for use in exposed outdoor environments such as moisture, salt or dust laden atmospheres. They are used extensively in chemical plants, oil and gas terminals where poor accessibility makes regular maintenance impracticable. Transformers immersed in synthetic coolants are suitable for use indoors with adequate ventilation or near to the load center where oil would not be considered environmentally acceptable.
Normally these type of transformers are accommodated by devices that measure heat related volume variations. Gas cushion is used to compensate the volume variation due to heat. Normally the gas is nitrogen. This gas is thermally uncoupled from the dielectric liquid.
Applications :
- Distribution
- converters
- step up
- Staring motor
- Excitation
- Earthing Transformer
- With OLTC
Application in following industries :
- Chemical, Pharmaceuticals, Steel, Textile, Engineering
- Plastic, Cement, Refineries, Mining, Captive Power Projects
- Hydro Power Projects, Wind Mill Farms, Construction Houses
- Pharma, Electrical, Electronics, Renewable Energy, Automobile
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