Asea Brown Boveri Ag

Alstom

Johann Schubert

Roland Schuler

Willibald Zerlik

Michael Jung

Stephan Hess

Christoph Hirsch

Hans Zimmerman

In an air-cooled electrical machine having reverse cooling in a closed cooling circuit, a two-stage blade cascade for the optimum incident flow of cooling air to the rotor ( ) and the rotor winding ( ) is provided between a rotor cap plate ( ) and a rotor shaft ( ). The first blade cascade stage ( ) in the direction of flow is a deceleration cascade having pressure-generating properties, and the following blade cascade stage ( ) in the direction of flow is a deceleration cascade having deflecting properties.

Rotor of a turbogenerator having direct gas cooling incorporating a two-stage flow cascade

Winding rods, built into the stator of an electrical machine, are no longer safe to operate after leakages in a water chamber. After this waterchamber has been removed, as is necessary anyway, a flexible, gas-proof hose is pulled upon the rod end, and the machine-side end of the hose is attached to the rod in a gas-proof manner. The other hose end is connected to a vacuum pump and, by evacuating the hose, the water that has penetrated into the rod insulation is removed by the same route as it penetrated into the insulation. The quality of this drying process is monitored by dielectric measurements.

Process for drying the insulation of stator winding rods of electrical

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Magenwil, Switzerland

Johann Schubert