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  1. As it happens, my experience predates the general...

    As it happens, my experience predates the general adoption of IEC standards - yes I am that old.......:)
    In the early days, we had dashpot relays. Obviously sustained overloads would trip them....
  2. Let me try this again in a little more detail for...

    Let me try this again in a little more detail for your benefit.
    All of the even the most basic motor overload units I've used in the past 40 some years have had current unbalance protection that...
  3. Duplicate.

    Duplicate.
  4. Depends how ~ you consider acceptable. I've...

    Depends how ~ you consider acceptable.
    I've checked a couple of motor/drive systems for which I had to provide guaranteed performance data.
    Your approach would have given me about a 20% error....
  5. Even the most basic motor overload units I've...

    Even the most basic motor overload units I've used in the past 40 some years have had unbalance protection that would offer single phase protection.
    That's not a criticism. It just might be your...
  6. Perceptive as ever.

    Perceptive as ever.
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    Maybe not - I missed the 3-phase in the title!...

    Maybe not - I missed the 3-phase in the title!
    But is the supply three phase?

    If so, I'd go for a simple double wound three phase unit.
    240V in, 600V out.
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    Single-phase, three-phase, kVA rating,...

    Single-phase, three-phase, kVA rating, application?
  9. Thread: motors

    by Besoeker
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    Why not just one three-phase unit? I've done...

    Why not just one three-phase unit?
    I've done that often enough where we have had systems on a non-standard voltage.
    Typically, our electronics is a standard design for 400/3/50 but sometimes the...
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    I did a student apprenticeship. During the...

    I did a student apprenticeship. During the vacation periods I worked for the company that sponsored me. So I got a bit of both. Actually, quite a lot of both. What struck me was how useful the...
  11. Thread: Frequency

    by Besoeker
    Replies
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    And I'm just as sure that your interpretation...

    And I'm just as sure that your interpretation accurately reflects what he intended...........:p
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    Practical is knowing how to. Theoretical is just...

    Practical is knowing how to.
    Theoretical is just knowing.
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    I suppose you are correct..................:)...

    I suppose you are correct..................:)
    Mathematical operators don't work well on forums like this.
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    It was for an aircraft research facility in the...

    It was for an aircraft research facility in the UK.
    There were actually two motors mounted on the same axis.
    They were testing a new version of a turbo prop arrangement. There were different modes...
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    If these figures are for input power, you need to...

    If these figures are for input power, you need to multiply by efficiency to get output power.
    I'm not sure about the numbers though.
    5.05A for 833W
    3.6A for 830W

    A 40% increase in current (3.6A...
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    That would give you kVA, not power.

    That would give you kVA, not power.
  17. Thread: Frequency

    by Besoeker
    Replies
    10$$
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    Possibly moving into the magnetic saturation...

    Possibly moving into the magnetic saturation region. Higher magnetising currents. Greater losses.
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    Yes. I made that point in post #5. But we don't...

    Yes. I made that point in post #5.
    But we don't rate motors based on input power. As I said, what we call a 55kW motor means 55kW output.
    For input, you would be more concerned with kVA or full...
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    HP and kW are both units of power. Real power if...

    HP and kW are both units of power. Real power if you like.
  20. I don't know how exactly Denis' transformers were...

    I don't know how exactly Denis' transformers were configured but I would guess something along the lines of a switched-mode power supply (SMPS).
    The input is rectified and feeds a high frequency...
  21. Yes, but I couldn't resist.............:p

    Yes, but I couldn't resist.............:p
  22. Told ya so!!! :p

    Told ya so!!!
    :p
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    The conversion is 1 HP is 0.746 kW. Bear in mid...

    The conversion is 1 HP is 0.746 kW. Bear in mid that this will give you output kW and you would need the efficiency to get input kW. PF gives you kVA.
  24. In which case I don't think it will work.

    In which case I don't think it will work.
  25. If the output is AC I don't think 'or-ing' diodes...

    If the output is AC I don't think 'or-ing' diodes would be a solution.
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