Siemens Aktiengesellschaft

Jurgen Weidner

Reinhold Koziel

Peter Grunewald

Kurt Fork

A method for decoupling a high-frequency error signal from a high-frequency electromagnetic field in a heavy electrical machine includes decoupling a high-frequency error signal with at least one temperature probe acting as an antenna and being associated with a stator carrying an electrical winding. In a heavy electrical machine having a stator carrying an electrical winding, an apparatus for decoupling a high-frequency error signal from a high-frequency electromagnetic field includes at least one temperature probe being disposed in the stator for generating a low-frequency temperature signal. The at least one temperature probe has connecting lines leading out of the stator. A diplexer decouples the error signal from the temperature signal. The diplexer has an input to which the connecting lines are connected, a first output at which the temperature signal is furnished, and a second output at which the error signal is furnished.

Method and apparatus for decoupling a high-frequency error signal from a

A method and device for detecting and localizing fault in electrical installations includes performing partial discharge measurements and high-frequency measurements at least at one location in the electrical installation and optionally in all phases, selectively comparing the measurement values with each other and with calibration signals, drawing conclusions from the measurements regarding the location and the type of the fault, selectively continuously and periodically performing the measurements at least at three measuring points while the installation is in operation, simulating the electrical installation in a computer as a high-frequency network, while simulating fault with the signals originating therefrom at the measuring points, comparing any measurement values which indicate fault with the simulated signal values for different fault types and fault locations, and determining the type and location of the fault from the simulated signal values which best agree with the measurement values and from the corresponding simulated fault.

Method and device for detecting and localizing faults in electrical

A method for partial discharge detection and breaking spark measurement in a dynamo-electric high-voltage machine, especially for monitoring insulation status during operation of a stator winding and connected electrical output lines in a turbo-generator. The generator includes a stator having a stator winding and a stator housing, a rotor with an exciter winding and a shaft, defining an air gap between the rotor and the stator. At least one oil lubricated slide bearing supports the shaft of the rotor with a bearing shell being electrically insulated from the ground. The method includes decoupling the frequency spectrum of high-frequency electromagnetic oscillations resulting from the occurrence of partial discharges or breaking sparks and delivering the frequency spectrum of high-frequency electromagnetic oscillations to a partial discharge measurement apparatus. The frequency spectrum of high-frequency electromagnetic oscillations introduced into the machine shaft through the air gap in the event of partial discharges inside the stator winding or the output lines are decoupled while utilizing the machine shaft insulated by a film of lubricant as a antenna. Then the frequency spectrum of high-frequency electromagnetic oscillations are delivered to the partial discharge measurement apparatus by using the bearing shell of the oil lubricated slide bearing as transmission element.

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Essen-Uberruhr, Germany

Jurgen Weidner