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Transformer drying and drying standard
The transformer body is primarily composed of an iron core, windings, and insulating materials assembled together. Before adding the transformer oil, it must undergo a drying process to eliminate moisture and gases from the insulation materials. This ensures that the moisture content remains within acceptable limits, maintaining the product's quality and guaranteeing sufficient insulation strength and service life.
The main objective of transformer drying is to remove moisture from the insulation system, thereby increasing the insulation resistance and the flashover voltage. Transformers rated above 4,000 volts must be dried before being put into operation.
A transformer should be dried under the following conditions:
1. After replacing windings or insulation during maintenance, especially if the insulating oil is suspected to contain moisture.
2. If the winding insulation resistance and absorption ratio indicate that the insulation has been compromised. The insulation resistance should not fall below 80% of the factory test values.
3. When the transformer core is exposed to air for a period longer than the recommended time during repair or installation, which may lead to moisture absorption.
Proper drying is essential to maintain the performance and longevity of the transformer, ensuring safe and reliable operation over its service life.
In addition to these technical requirements, it's important to follow manufacturer guidelines and industry standards when performing transformer drying procedures. Regular inspection and maintenance can help prevent moisture-related failures and extend the lifespan of the equipment.
For optimal results, use high-quality drying equipment and ensure proper ventilation during the process. Always monitor the temperature and humidity levels to achieve the desired level of dryness in the insulation system.