Abstract
In order to effectively analyze the torsional vibration characteristics of turbo-generators, a measurement and analysis system for torsional vibration is constructed using virtual instrumentation. The hardware framework is configured via PXI system. The system software is developed through LabVIEW language. The measurement system records speed signals from the turbo-generators and extracts directly the total torsional vibration from the speed signals utilizing zero-phase digital filter. It separates torsional vibration modes from the total torsional vibration and analyzes the corresponding characteristics of each mode. This measurement system has been employed in several power system field tests since the end of the last year. To verify the performance of the measurement system, data from the field tests are selected for analysis. The results show that the torsional vibration measurement system detects the torsional vibration of turbo-generators accurately and the system fulfills the practical application demands.
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