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newbie question on variable transformer

Discussion in 'Misc Electronics' started by Lily, Nov 3, 2004.

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  1. Lily

    Lily Guest

    hi,

    im currently doing research on fuses. my research basically involve of
    single phase variable transformer and it is connected to the fuse (im
    currently research on). the secondary voltage capacity current is up
    to 700A however right now i can only increase the current up to 80A. I
    am using the AC/DC clamp metre to measure the current that I have
    gradually increasing. My question is how do i increase the current up
    to 200A, i have try to increase the coil turns but the AC/DC clamp
    metre doesnt show any reading. What equipment shall i use instead of
    the ac/dc clamp metre ? any advice/comments are highly appreciated.
    thanks.
     
  2. Ken Taylor

    Ken Taylor Guest

    What sort of transformer are you using? What sort of load are you using, or
    are you relying on short-circuit current? It is quite possible that your
    test circuit has enough resistance in it that it is limiting the current in
    your load circuit. Is your ammeter rated to 200A?

    Ken
     
  3. John G

    John G Guest

    With wanting to be rude, I think from the questions you ask and the
    impression they develop of your knowledge you need to learn a lot more
    about electricity theory before you play with circuits capable of
    delivering 200 amps.

    200 amps is serious fire stuff even at very low voltages.

    You have not really described you test circuits enough for us to give
    any real advice as to why it does not work as you expected.
     
  4. E. Rosten

    E. Rosten Guest

    That's half the fun, though I never had anything capable of delivering
    200A when I was a kid. Didn't stop me burning holes in everything I
    could get my hands on when I got my first 40A power supply. And first
    collection of camera flash capacitors. And my first 180V pwer supply
    (which taught me about safety the hard way).

    :)

    -Ed



    --
    (You can't go wrong with psycho-rats.) (er258)(@)(eng.cam)(.ac.uk)

    /d{def}def/f{/Times findfont s scalefont setfont}d/s{10}d/r{roll}d f 5/m
    {moveto}d -1 r 230 350 m 0 1 179{1 index show 88 rotate 4 mul 0 rmoveto}
    for /s 15 d f pop 240 420 m 0 1 3 { 4 2 1 r sub -1 r show } for showpage
     
  5. JeffM

    JeffM Guest

  6. E. Rosten

    E. Rosten Guest

    I didn't have any car batteries... I couldn't afford them on my pocket
    money. Besides, despite being pretty alright about me messing around
    permenantly with that kind of stuff, I expect my parents wouldn't have
    liked the idea quite so much of me having basically a very large bucket
    of acid in my room.

    :)

    -Ed


    --
    (You can't go wrong with psycho-rats.) (er258)(@)(eng.cam)(.ac.uk)

    /d{def}def/f{/Times findfont s scalefont setfont}d/s{10}d/r{roll}d f 5/m
    {moveto}d -1 r 230 350 m 0 1 179{1 index show 88 rotate 4 mul 0 rmoveto}
    for /s 15 d f pop 240 420 m 0 1 3 { 4 2 1 r sub -1 r show } for showpage
     
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