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  1. Thread: XFMR DGA

    by Besoeker
    Replies
    5$$
    Views
    274

    And some are quite spectacular........ ...

    And some are quite spectacular........


    https://www.youtube.com/watch?v=nibB2c9djCo
  2. What voltage is the motor?

    What voltage is the motor?
  3. Thread: My sons

    by Besoeker
    Replies
    35$$
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    1,405

    Nature or nurture you mean? I think probably...

    Nature or nurture you mean?
    I think probably both.
  4. Thread: My sons

    by Besoeker
    Replies
    35$$
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    1,405

    I have three children and all have worked for me...

    I have three children and all have worked for me during school holidays. It turned out to be just fine.
    My sweet wife worked for me (in admin) for about 15 years before deciding that she wanted to...
  5. Replies
    16$$
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    450

    Do you know what voltage the clutch coils are?

    Do you know what voltage the clutch coils are?
  6. Replies
    16$$
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    450

    Can't you just replace it with a silicon...

    Can't you just replace it with a silicon rectifier?
  7. Thread: Transformers

    by Besoeker
    Replies
    11$$
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    431

    Routinely done in the UK as I'm sure you know.

    Routinely done in the UK as I'm sure you know.
  8. Thread: harmonics

    by Besoeker
    Replies
    8$$
    Views
    378

    To add a little more to the above. The PWM...

    To add a little more to the above.
    The PWM (pulse width modulated) waveform fed to the motor has very fast switching edges. The voltage can get from zero to DC link level, usually about 1.35 times...
  9. Thread: harmonics

    by Besoeker
    Replies
    8$$
    Views
    378

    It's a dv/dt (rate of change of voltage) issue...

    It's a dv/dt (rate of change of voltage) issue rather than a harmonics issue that affects the bearings. The bearings operate with a very thin layer of lubricant, often less than 20um and induced...
  10. Replies
    43$$
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    977

    See post #17.

    See post #17.
  11. Replies
    19$$
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    772

    Good point, sir.

    Good point, sir.
  12. Replies
    43$$
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    977

    Rated torque and 20% faster would result in 20%...

    Rated torque and 20% faster would result in 20% more power.
    P=Tw

    Could the motor dissipate the additional losses?
  13. Replies
    19$$
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    772

    The conductors or the insulation?

    The conductors or the insulation?
  14. Replies
    43$$
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    977

    It might be helpful to see the nameplate details.

    It might be helpful to see the nameplate details.
  15. Replies
    43$$
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    977

    Except the voltage and frequency.

    Except the voltage and frequency.
  16. Replies
    43$$
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    977

    No disagreement with that but it wasn't really my...

    No disagreement with that but it wasn't really my point.
    I was asking the OP if he was sure the motor really came from Europe.
    480/277/60Hz isn't used in Euroland.

    The "harmonised" standard...
  17. Replies
    7$$
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    216

    I'm aware of that which is why I stated it as...

    I'm aware of that which is why I stated it as sqrt(3) in my response.
  18. Replies
    7$$
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    216

    But probably not relevant in this case if, as you...

    But probably not relevant in this case if, as you suggest, you use sqrt(3) to get line to neutral voltage from the 6.6kV.
  19. Replies
    43$$
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    977

    Are you sure it's European? EU land is standard...

    Are you sure it's European? EU land is standard 400/230V and 50 Hz.
  20. Replies
    7$$
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    216

    I did and, as expected, it does.

    I did and, as expected, it does.
  21. Replies
    24$$
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    1,188

    Greater risk of errors the more conductors you...

    Greater risk of errors the more conductors you have to move.
  22. Replies
    57$$
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    2,472

    To me that sounds like bordering on a criminal...

    To me that sounds like bordering on a criminal offence, if not an actual criminal offence.
    It certainly would result in instant dismissal here.
  23. Replies
    24$$
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    1,188

    Good thinking. Different approach. Same idea....

    Good thinking. Different approach. Same idea. Especially if it can be done by just rerouting the power conductors.
    But what about controls? Push a remote start button and the wrong motor runs?
    ...
  24. Replies
    24$$
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    1,188

    If the motors are all the same rating and...

    If the motors are all the same rating and performing the same duty, might I suggest swapping two of the motors?
  25. Or non-linear loads.

    Or non-linear loads.
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