Kraftwerk Union Aktiengesellschaft

Kurt Fork

Dietrich Lambrecht

Hermann Waldmann

Helmut Hofmann

Device for monitoring the service life of the shaft of a turbine-generator set includes an analog computer circuit having a pair of inputs and an output, means for feeding to the inputs of the analog computer circuit electrical quantities proportional to the voltage and the current of the generator, the analog computer circuit having means for converting the electrical quantities that are proportional to the generator voltage and current to an electrical quantity proportional to the electrical torque in the air gap of the generator, a simulation circuit having an input connected to the output of the analog computer circuit for receiving therefrom the electrical quantity proportional to the electrical torque in the air gap of the generator, the simulation circuit comprising means for determining the torques in individual sections of the shaft of the turbine-generator set and having a multiplicity of outputs corresponding to the number of individual sections of the shaft, an analog-to-digital converter having an output and having inputs connected to the outputs of the simulation circuit for receiving therefrom analog data corresponding to the torques in individual sections of the shaft and converting them to corresponding digital data, a digital computer having an input connected to the output of the analog-to-digital converter and connected therethrough to the simulation circuit, a trouble-monitoring device connected parallel to the analog-to-digital converter, and having means for restricting the analog-to-digital converter to feed the digital data through the output thereof to the input of the digital computer only if a torque of extreme value is present in a section of the shaft, the digital computer having means for converting the digital data into signals proportional to the service life of the shaft.

Durability or service-life monitoring device for a turbogenerator shaft

In a system for limiting torque occurring in a turbine-generator shaft when a three-pole short circuit is switched off, one pole of a switch that switches-off the short circuit is opened first, and both of the other poles are then opened after the passage of a predetermined delay period.

System for limiting torque in a turbine-generator shaft

An overload protection device for a turboset including an alternating current generator, a turbine for the drive thereof, and a network supplied from the generator when disconnecting any short circuit within the network comprises a memory connected to the generator for storing a voltage vector corresponding to positive sequence components obtained therefrom prior to the occurrence of a fault in the network, a comparison circuit connected to the memory and to the generator for comparison of of the stored voltage vector with a voltage vector corresponding to positive sequence components obtained from the generator following occurrence of the fault to generate a difference value, and a switch interconnected between the network and the generator for being released upon the difference value exceeding a predetermined value.

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Erlangen, Germany

Kurt Fork