Method for drying an active part and device for carrying out this method
AssigneeMicafil AG
InventorsPaul Gmeiner, Peter Keller
Life of this patent
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Abstract
The method serves for drying an active part containing at least one winding and solid insulations. The active part is arranged in a vacuum-tight housing and is heated there to a final temperature value (Tfin) by means of warmed oil and by means of a current (I) carried in the winding. The warmed oil is sprayed in the housing at reduced pressure (p) and with the current (I) switched on. At the same time, water is extracted from the active part. The sprayed oil is collected on the housing bottom, after discharging heat to the active part, and, after rewarming, is sprayed once again in the housing at reduced pressure and with the current switched on. The active part is thus dried particularly quickly and carefully.
Claims10
A method for drying an active part containing at least one winding and solid insulations, in a vacuum-tight housing, comprising the steps of:
- a. reducing the pressure in the housing to a working value, wherein the working value is higher than a desired pressure determined by Paschen's Law and lower than an upper pressure limit value, which in relation to atmospheric pressure, ensures a high evaporation rate of water from the active part;
- b. extracting water from the active part from the reduction of pressure in the housing;
- c. switching on current to be carried in the at least one winding;
- d. spraying warmed oil in the housing;
- e. heating the active part to a final temperature value by the warmed oil being sprayed and the current being carried in the at least one winding;
- f. collecting the sprayed oil on the housing bottom;
- g. reheating the collected oil;
- h. recirculating the reheated oil by spraying the reheated oil at the working pressure;
- and
- i. maintaining the temperature of the winding at a higher temperature than the temperature of the oil.
Dependencies are inferred from the claim text.