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Transformer drying and drying standard
The transformer core is primarily made up of an iron core, windings, and insulating materials. After assembly, the transformer must be dried before oil is added to remove moisture and gases from the insulation materials. This process ensures that the water content remains within acceptable limits, maintaining the product's quality and guaranteeing sufficient insulation strength and service life.
Drying the transformer is essential to eliminate moisture from the insulation system, which helps increase the insulation resistance and flashover voltage. Transformers with voltages above 4000 volts typically require drying to maintain their performance and safety standards.
A transformer should be dried under the following conditions:
1. When windings or insulation are replaced during maintenance, or when the insulating oil does not contain any moisture.
2. If the insulation resistance and absorption ratio indicate that the windings have been exposed to moisture. The insulation resistance should be at least 80% of the factory specifications.
3. When the transformer core is exposed to air for a period longer than the recommended time during repair or installation.
Proper drying procedures are crucial to prevent electrical failures and ensure long-term reliability. It is important to follow manufacturer guidelines and use appropriate drying methods such as vacuum drying or hot oil drying. Regular testing and monitoring of insulation resistance and moisture levels are also necessary to assess the effectiveness of the drying process. By ensuring the transformer is properly dried, you can significantly extend its lifespan and improve overall operational efficiency.