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Type: Posts; User: Besoeker

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  1. Replies
    14$$
    Views
    300

    Expressed rather eloquently if I may say so.

    Expressed rather eloquently if I may say so.
  2. Thread: valve

    by Besoeker
    Replies
    4$$
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    203

    Is it DC?

    Is it DC?
  3. Replies
    27$$
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    497

    I think it has been done connecting two Japanese...

    I think it has been done connecting two Japanese islands.
  4. Replies
    13$$
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    326

    On some occasions but where the the purpose is to...

    On some occasions but where the the purpose is to change the voltage or provide 12-pulse operation.
    And I've done the odd drive with a polygonal transformer to provide a phase shift from other...
  5. Replies
    13$$
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    326

    Why use one in the first place?

    Why use one in the first place?
  6. Replies
    27$$
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    497

    HVDC exists for a reason.

    HVDC exists for a reason.
  7. Thread: Gost approval

    by Besoeker
    Replies
    4$$
    Views
    189

    Done already. Rang to get the right guy....

    Done already.
    Rang to get the right guy. Followed it up with an email.
    Awaiting results.

    My post here was to see if anyone else had more experience/more direct information.
  8. Thread: Gost approval

    by Besoeker
    Replies
    4$$
    Views
    189

    Gost approval

    From a customer specification:

    All fuses shall be GOST approved type for use in Russia.

    Any assistance on what this involves would be greatly appreciated.

    Mr B.
  9. Replies
    7$$
    Views
    402

    I've looked at this a few times. Is there a...

    I've looked at this a few times. Is there a problem in getting what you want, a 480V to 400V autotransformer, made to order?
  10. Replies
    23$$
    Views
    737

    Mrs B and I have worked together now for about 14...

    Mrs B and I have worked together now for about 14 years. I won't give her age away but neither of us are spring chickens.
    Simple arrangement.
    I'm the boss at work.
    She's the boss at home.
  11. Replies
    16$$
    Views
    361

    Obviously I'm not in a position to comment on NEC...

    Obviously I'm not in a position to comment on NEC requirements. So I won't.
    I dealt with a few data centres here in UK. They have all had UPS systems supplying them. And an EPO system to kill those...
  12. Replies
    20$$
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    577

    Or perhaps not. Depends on what you are...

    Or perhaps not.
    Depends on what you are measuring. With good PWM modulation and a reasonably high switching frequency the current will be a pretty good sine wave.

    Voltage?
    Well, we currently...
  13. Replies
    20$$
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    577

    It happens to the best - and the worst - of us.

    It happens to the best - and the worst - of us.
  14. Replies
    20$$
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    577

    I don't think I did.

    I don't think I did.
  15. Replies
    45$$
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    1,035

    Yes. I was wrong. I was thinking in terms of...

    Yes.
    I was wrong.
    I was thinking in terms of power.
  16. Replies
    45$$
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    1,035

    No. Not if it is rated at 0.8 pf.

    No.
    Not if it is rated at 0.8 pf.
  17. Replies
    45$$
    Views
    1,035

    Just resistive at 1.0pf would correspond to rated...

    Just resistive at 1.0pf would correspond to rated current. So 500kW. No need for reactance to get that. No need for the 1.25 times the rated kW.
  18. Replies
    20$$
    Views
    577

    I can try. Most of the electronic gizmos you...

    I can try.
    Most of the electronic gizmos you have in your house will have an electronic power supply. Computers, televisions, chargers, printers, LED and CFL lights.......and the whole jing bang....
  19. Replies
    20$$
    Views
    577

    The harmonics associated with a multi-pulse...

    The harmonics associated with a multi-pulse system follow a rule.
    For example, with 6-pulse you get 6n±1 where n is the integer series 1, 2, 3, etc...
    So you get 5th, 7th, 11th, 13th, 17th, 19th,...
  20. Replies
    20$$
    Views
    577

    Shouldn't be with 24-pulse.

    Shouldn't be with 24-pulse.
  21. Replies
    20$$
    Views
    577

    A 24-pulse drive should not produce appreciable...

    A 24-pulse drive should not produce appreciable harmonics. Lowest order is 23rd and just a few percent at that.
    Do you have actual harmonic data that you can cite?
    Have you checked the supply side...
  22. Replies
    45$$
    Views
    1,035

    Do you need enlightenment?

    Do you need enlightenment?
  23. Replies
    45$$
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    1,035

    Is that a test question?

    Is that a test question?
  24. Replies
    45$$
    Views
    1,035

    No? Then you are hardly in a position to lecture...

    No?
    Then you are hardly in a position to lecture me about what standards are applicable there, are you?
    Maybe the 50Hz from the OP could have have clued you in.

    And, for the avoidance of doubt,...
  25. Replies
    45$$
    Views
    1,035

    In means 0.8 pf.

    In means 0.8 pf.
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