Siemens Aktiengesellschaft

Kurt Fork

Reinhold Koziel

Jurgen Weidner

Hermann Waldmann

Wolfgang Kaufhold

Wolfgang Meusel

Peter Grunewald

Frank Krutemeier

In a method and a device for the closed-loop control of a turbine-generator configuration, a turbine control element is supplied with a first correcting variable and an exciter control element is supplied with a second correcting variable. The correcting variables in each case are formed from at least one reference value. In order to ensure reliable closed-loop control, the first correcting variable for the turbine control element is composed of at least two partial correcting variables. One of the partial correcting variables is derived from the reference value for forming the second correcting variable for the exciter control element.

Method and closed-loop control device for the closed-loop control of 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.

Method for partial discharge detection and breaking spark measuring in

A circuit for damping hunting oscillations of controlled electric machines. The circuit is provided with a measuring circuit for determining the hunting oscillations and an identifier circuit for determining the angle components of such hunting oscillations. A phase shifter circuit is provided for receiving the angle components produced by the identifier circuit and forming a hunting oscillation correction signal which is shifted in phase from the hunting oscillations by a predetermined phase angle. The hunting oscillation correction signal is conducted to a control unit of the electric machine. The invention is particularly useful in damping hunting by the rotors of voltage controlled synchronous generators.

Growing community of inventors

Neunkirchen, Germany

Kurt Fork