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- Following an urgent vibration measurement request from a thermal power plant with an installed capacity of 1200MW, the Resonance Institute technical team took swift action and arrived on site within two hours.
- The root cause of a sudden noise problem in a 600MW steam turbine-gas turbine-generator was identified using a 16-channel TWave T8 analyser.
Measurement and Analysis:
- By connecting to the relative shaft sensors in the turbine and generator bearings via the protection system, it has been confirmed that the vibration levels are within normal and standard limits.
- Periodic impacts detected near the generator bearing on the gas turbine side but originating from within the body were observed in measurements taken with 16-channel TWave T8 analysers.
- Amplitudes increasing above 400MW power at 0.25X (one-fourth of the rotational frequency) and harmonics prove the existence of a loose part.
- With the help of accelerometers placed on the body, it was determined that the source of the vibration was located near the top of the generator, behind the stator windings.
- Following an examination of technical drawings with field technical personnel, it was thought that the loose part could be a valve that maintains internal pressure balance in the hydrogen-cooled generator.
Result:
- The following day, after the turbine shutdown, the field personnel inspected the valve and found that its bolts had loosened. After tightening the bolts, it was confirmed that the impacts and noise had ceased.
- Thanks to rapid intervention, flexible measurement capabilities and advanced analysis methods, a major problem was prevented and production continued uninterrupted.
