Maintenance / overhaul decision making
High vibration levels had been detected on the generators, which are over 20 years old, particularly during or after the start up of large DOL motors driving loads such as main gas compressors, that had been sufficient to cause the system to trip. Testing with Partial Discharge and conventional Vibration Analysis had failed to pinpoint the cause. Testing using the Faraday Predictive P100 Portable Equipment Health Assessor concluded that two simultaneous problems were present – a rotor winding insulation fault (probably turn-turn) and damage to the anti-vibration damper bars.
Specific focus will be paid to these areas during a major overhaul of the generator. It has been decided that this will involve a complete removal of the generator from the platform to overhaul and test onshore.
Subsequent strip down of the generator confirmed a turn-to-turn fault in one of the poles of the rotor, and significant deterioration of a number of other components.
What to do next
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