| 摘要 |
The process is used for predrying a coil block (5) inside a gas-tight housing (1), said coil block containing at least one winding (51) and solid insulations. The winding is hereby heated under reduced pressure with direct current or low-frequency alternating current to an upper winding temperature. Parallel to this, the solid insulations are heated with air circulating inside the housing (1). The air temperature is hereby maintained lower than the winding temperature. The combined heating with heating current and circulating air results in an especially uniform predrying, and at the same time saves time and energy. At the same time, the winding can be stabilized and dimensioned during the predrying process under the action of pressure.
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