# newbie question on variable transformer

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

1. ### LilyGuest

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 TaylorGuest

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 GGuest

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. RostenGuest

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

6. ### E. RostenGuest

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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