Alstom Technology Limited

Alstom (Switzerland) Ltd

Ingo Kirchhoff

Max Hobelsberger

Zlatimir Posedel

Bernhard Mark

Peter Haeusermann

Peter Stutz

Eric Nodwell

A method and apparatus for detection of spark activity in an electrical machine having a shaft, wherein at least one of the shaft voltage and the shaft current is measured and analyzed for components which are characteristic of spark activity. The method uses the shaft voltages and/or shaft currents which are normally generally regarded only as being damaging has been found to be accurate and to be suitable for long-term monitoring of spark activities such as brush sparking, spark erosion, spark flashovers between parts of the shaft bearings and can be implemented physically very easily and in a reliable manner, since the existing grounding devices are used.

Method and apparatus for detection of brush sparking and spark erosion on electrical machines

A method for detecting vibrations of a shaft of an electrical machine includes measuring at least one of a shaft voltage and a shaft current and analyzing the measured at least one of the shaft voltage and the shaft current so as to determine the vibrations. In addition, an apparatus for detecting vibrations of a shaft of an electrical machine includes a first grounding device disposed at a first point on the shaft on a first side of the electrical machine and a second grounding device disposed at a second point of the shaft on a second side of the electrical machine. The second grounding device is configured to measure at least one of a shaft voltage and a shaft current.

Apparatus and method for detecting vibrations of the shaft assembly in an electrical machine

An apparatus and a method for monitoring and/or analysis of electrical machines during operation, wherein the electrical machine has at least one generator with a shaft and drive means for driving this shaft, wherein the shaft is grounded at the first end of the generator, and wherein a measurement unit for measurement of shaft voltage and/or shaft current as a function of time is provided on the shaft at the second end of the generator. An apparatus such as this allows the combined and simultaneous measurement of various fault states by supplying signals for the shaft voltage and/or the shaft current to an analysis unit, wherein the analysis unit allows combined and simultaneous analysis of at least two potential fault states of the electrical machine. Simultaneous cross-relationships between the individual measurement results of individual fault states may be provided so as to allow a clearer and more reliable diagnosis of critical states, not possible when individual phenomena are considered separately.

Apparatus and method for monitoring and/or analysis of electrical machines during operation

In a device for the investigation of components of a generator which border on a machine air gap () between stator and rotor (), with the rotor () built in, by means of at least one moveable inspection probe (), a simple, flexible and rapid mounting is ensured in that the device comprises a base unit () which can be secured to the rotor () on both sides, and which permits at least one inspection probe () to move in the machine air gap (), both in an axial direction with respect to the generator axis and also in the circumferential direction of the machine air gap () over the whole circumference of the rotor.

Device for generator diagnosis with built-in rotor

The present invention relates to a method, an apparatus and a computer program for inspecting laminated iron cores ( ) of electrical machines for interlamination shorts, in which the laminated iron core ( ) is magnetized by means of an auxiliary winding, and the iron surface is scanned by means of at least one measurement coil arrangement ( ) with a downstream measurement device. In this case, unique and quantifiable localization of interlamination shorts is achieved by using both the phase ( ) and the amplitude ( ) of the electrical signal which is induced in the at least one measurement coil arrangement ( ), in combined form.

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Bellikon, Switzerland

Ingo Kirchhoff