The transformer body is mainly composed of iron core and coil and insulating material assembly. After assembly, before the transformer oil is added, it must be dried to remove moisture and gas from the insulating material, so that the water content is controlled by the product quality. Within the limits of the limit to ensure that the transformer has sufficient insulation strength and operating life.
The purpose of transformer drying is to remove moisture from the transformer insulation, increase its insulation resistance, and increase its flashover voltage. Transformers with voltages above 4000 must be dried.
The transformer should be dried after encountering the following conditions:
1,
Replace windings or insulation during maintenance,
The transformer insulating oil does not contain moisture.
2,
The transformer winding is wetted by the insulation resistance and absorption ratio.
The insulation resistance is not less than 80% of the factory data;
3,
When repairing or installing the body, the body is exposed to the air for a period of time exceeding the corresponding specified time.
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