Alstom Technology Limited

Ingo Kirchhofff

Max Hobelsberger

Zlatimir Posedel

Ren&eacute; Kohler

A protective and monitoring apparatus ( ) for monitoring and reducing shaft currents and shaft voltages on the generator shaft ( ) of a generator ( ) which produces electrical power, which protective and monitoring device ( ) is connected between a contact apparatus ( ), which makes contact with the generator shaft ( ), and a grounding connection ( ) and comprises a parallel circuit formed by a resistance and a capacitance, with one end of the parallel circuit ( ) being connected to the contact apparatus ( ) and its other end being connected to the grounding connection ( ), said parallel circuit being protected against overvoltages on the generator shaft ( ) and means ( ) being provided for bridging the parallel circuit ( ) when an overvoltage occurs.

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Zurich, Switzerland

Ingo Kirchhofff