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  1. jmmeunier

    Information request on generators for wind turbines

    Hi, I am look for information on different generators for wind turbines. Could you help me to complete the following caracteristics? Stator turn insulation (A), stator groundwall insulation (B), rotor winding insulation (C), stator wedge material (D), cooling method (E), known generic issues...
  2. jmmeunier

    HV Motor damage - Root cause analysis

    Hi, Herewith attached is the description of the scenario which, I suppose, occured on this motor. This based on the consulted measurements reports and on the visual inspection (see pictures on the former post)...
  3. jmmeunier

    HV Motor damage - Root cause analysis

    ElectricPete, I agree with the faxct that the scenario of krsh is good. You also suggest that the initial cause could be excess clearance in the non-coulping-end bearing. However the clearances of both bearings which were measured in 2009 by the repair shop were within the tolerances (10% of...
  4. jmmeunier

    HV Motor damage - Root cause analysis

    Also, the accelerometers are not permanently installed, but are used for routine measurements. The model is A0760GP from CSI. Regards,
  5. jmmeunier

    HV Motor damage - Root cause analysis

    Electricpete, Q1: see attachement Q2: only a derbis Q3: yes it is (mistake from my part the stratches are only present on the bottom part of the bearing) Q4: yes Indeed a problem with oil could damage the bearing in such a...
  6. jmmeunier

    HV Motor damage - Root cause analysis

    Krsh, Electricpete, Thank you for your answers!!! I also tend to think that the added metal has been eroded on the side of the bearing (there are not only scoring). The current bearing clearance should be measured to get an answer. On the top of the bearings, there are only scratches probably...
  7. jmmeunier

    HV Motor damage - Root cause analysis

    Hi Zlatkodo, No it isn't...
  8. jmmeunier

    HV Motor damage - Root cause analysis

    Thank you for your replies! rem: sorry for my english: that is not my mother language. WHAT IS CERTAIN: A) Stator/Rotor a1 - the motor is DOL started a2 - the rotor rubbed the stator on NDE on the left when looking from CCW side. a3 - the recent ring test showed hot spots on the whole damaged...
  9. jmmeunier

    HV Motor damage - Root cause analysis

    The rub is on the left side when looking from the end where the rotor goes CCW. I also think that the problem was intermittent because the vibration measurements - which are never performed during the motor start phase - do not show any (permanent) eccentricity.
  10. jmmeunier

    HV Motor damage - Root cause analysis

    Hi Krsh and Electricpete, Thank you both for you replies. Krsh, The babbit was machined in 2009. Do you think that particles from the babbit could have torn away the bearings and damaged the babbit surface? Electricpete, The bearing clearance is 0,0095 inch (0,24 mm). The depth of the marks...
  11. jmmeunier

    HV Motor damage - Root cause analysis

    Hi, We discovered damages on a HV Motor having the following parameters: Rated voltage: 6kV Power: 5500 kW Freq: 50 Hz RPM: 1490 Operation: water pump (power station) Airgap: 3 mm Pictures from the stator, the rotor and the bearings are presented in attachement. - This motor was rewound, the...

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