Post-overhaul assessment and baselining decision making
Testing was carried out on the generators on this North Sea Oil and Gas production platform following a major routine overhaul. The intention was to compare the outputs from three generators, and since one had recently had a major overhaul, with a complete new rotor and a completely re-wound in-situ stator, to see how the newly overhauled unit, presumed to be in good condition, compared with the other two units.
Readings showed that there were unexplained distortions on the voltage and current waveforms associated with the running of the newly overhauled generator, that suggested some form of fault had been inadvertently introduced during the rewind / rotor replacement. Further tests were recommended to pin down the cause.
What to do next
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