Bbc Brown, Boveri & Company, Limited

Hansruedi Rutz

Werner Haditsch

Ernst Toplak

An exciter-current lead-through bolt which is passed through a radial bore in the rotor shaft of a dynamo-electric machine, especially a turbo-generator, and screwed into an exciter-current lead-in conductor bar which lies in a longitudinally extending bore within the shaft. The radially outer part of the lead-through bolt is mechanically and electrically connected with a terminal conductor bar leading to the exciter winding located on the rotor. The lead-through bolt preferably made of steel because of its high mechanical strength is cooled internally by means of a forced air circulation system including a tube inserted in a longitudinal bore through the bolt, the diameter of the bore being greater than the external diameter of the tube in order to provide an annular space therebetween for flow of air from an air inlet port outside of the shaft radially inward to the end of the tube adjacent the inner end of the bolt, then into the tube and radially outward therethrough to an air discharge port also located outside of the rotor shaft and at a radial distance greater than the air inlet port.

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Wettingen, Switzerland

Hansruedi Rutz