Torque monitoring systems for detection and evaluation of interactions between grid and generator

Due to the increasing number of electronic power converters connected to the electrical transmission grid based on the increasing number of renewable power systems it is necessary to take care of the interaction between the grid and the conventional power plants. Beside the well-known malfunctions which can occur to the conventional power plants especially to the turbo sets connected by the electrical generator to the grid, the danger of damages caused by the excitation of torsional vibrations is still increasing. Typical damages are cracks in shaft trains at the surface or cracks in the area of the couplings. Today the necessity of the monitoring of torsional vibrations still exists. The presentation will show a modern approach of monitoring and evaluating torsional vibrations of shaft trains of turbo sets. The boundary conditions and possibilities of different software tools will be shown in combination with the use of a magnetostrictive sensor, which is used for the torque measurement and the measurement of phase voltage und current.