Application 4. 50 MW Hydrogenerators

In this applications, the system serves the purpose of protection and diagnostics of two hydrogenerators having very low rotation speed, equalling 160 rpm. Current signals provided by the TNC2000 are used for protection and are fed to a hydrogenerators control system. The following set of measurements is performed for each machine:- 4 absolute vibration channels

• 6 relative vibration channels in two axes
• 3 axial displacement channels
• rotating speed measurement
• phase marker

The system features off-line diagnostics.  Portable computer with installed PAR application software is used to register the vibration signals. As per customer’s wish, the signals are registered in specific band or bands, depending on the channel type. To allow for the change of band, the TNC2000 is provided with special set of filters and PAR controlled multiplexer circuit while the signals are divided into four band dependent groups. The registration process runs fully automatically. The saved vibration measurement data can be next analysed off-line.