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Discuss 3 phase quarry pump in the Industrial Electrician Talk area at ElectriciansForums.co.uk.

  1. alanmcm

    alanmcm Regular EF Member

    Location:
    Belfast
    thanks very much, I will check at the pump itself once its lifted out.
     
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  3. Marvo

    Marvo Administrator Staff Member

    Location:
    South Africa
    Is the generator supply fused?

    If the original cable fault took out only one of the supply fuses then the two remaining phases might have damaged one of the motor windings.

    Disconnect the motor and test it for winding resistance. Remove any links and megger test between windings if you can as well.

    The pump motor is almost certainly damaged but before you reconnect after repairs or replacement make sure it has effective protection against two-phasing.
     
  4. alanmcm

    alanmcm Regular EF Member

    Location:
    Belfast
    Good thinking Ill put in place a phase detection relay if there isn't one already, I'm thinking there isn't. Once its lifted out ill test more effectively, my welly boots just aren't made for wading through the water to get to the pump.
     
  5. Marvo

    Marvo Administrator Staff Member

    Location:
    South Africa
    With mine pumps we always get a crane to drag it/lift it onto dry ground. Quarry pumps would be similar.

    I witnessed one of the maintenance guys on a mine get killed whilst working on a pump in a slurry pit one time so think safety and not just electrical safety, assess and manage risks from all places, especially upstream.
     
    westward10 and GMES like this.
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  7. darkwood

    darkwood Dreams in which I'm dying are the best I ever had. Staff Member

    Location:
    West Yorkshire
    Thanks for the reply Alan wasn't been funny in any way but knowing the sequence of events can save many a guess work and hopefully give better advice
     
  8. alanmcm

    alanmcm Regular EF Member

    Location:
    Belfast
    Didn't take any offence from it, I love learning and find asking a forum of highly qualified and experienced people is better than just trying to muddle through it. Means I can learn different safe techniques and methods to get the result I'm after and to improve the safety. I'm not the most experienced but I'm getting there, slowly but surely and safety is paramount in this line of work.

    I appreciate all the replies and the patience trying to understand what I'm trying to ask.
     
  9. timbobelfast

    timbobelfast Electrician's Arms

    Location:
    Belfast
    I would be checking the windings. Sounds like one set is O/C.
    Also check your Isolator does't have a Pole O/C as well!
     
  10. benji

    benji Electrician's Arms

    Location:
    north east
    Probably got nothing to do with fault but would 10mm be ok with the starting current , if not you could parallel both cables
     
  11. LankyWill

    LankyWill Electrician's Arms

    Location:
    Northants
    Just from a learning perspective, how do you test a motors windings? what results are you looking for?
     
  12. Marvo

    Marvo Administrator Staff Member

    Location:
    South Africa
    If you can remove the links you'd test that all three windings are equal resistance and that their resistance is per manufacturer spec if info is available. You'd also megger test between each of the 3 windings to ensure there is no breakdown of the insulation between them.
     
    pennychew likes this.
  13. alanmcm

    alanmcm Regular EF Member

    Location:
    Belfast
    Test the windings to earth using an insulation resistance tester. Test between each line to earth and expect quite high readings, over 1M ohm is acceptable but I wouldn't like to walk away from a motor knowing the motor is close to that. Then remove links and go between each line and test for resistance and make sure the windings are balanced.
     
    LankyWill likes this.
  14. alanmcm

    alanmcm Regular EF Member

    Location:
    Belfast
    There is 2 10mm cables coming down and are paralleled together.
     
  15. LankyWill

    LankyWill Electrician's Arms

    Location:
    Northants
    cheers mate
     
  16. alanmcm

    alanmcm Regular EF Member

    Location:
    Belfast
    Went in yesterday morning and disconnected the pump from the circuit and tested the cables again for insulation resistance and all OK. Got the quarry operative to start it up, with the pump disconnected, and it didn't trip. Tested voltages and all were fine. So pump at fault. Didn't get a chance to get at the pump as the crane lifted one out and dropped a new one in and the old one was whisked away for repair. When it returns I'll ask what the fault was as I would like to know.

    Thanks for all the help and advice.
     
    Wilko and westward10 like this.
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