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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Can you say RIDICULOUS?!
Why can't you just make your own CT? Heck, you could even use a shunt if there was not thousands of volts on the primary.
Just get a ferrite transformer and make a CT. The only problem is that it is not split core, so you have to thread the wire through it. Unless, of course, you somehow made it split core... Hmm... That could be done with a U core transformer i suppose. You could also use a current transducer. I have one that i need to figure out. (its 400 amps 5v)
Registered Member #2161
Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247
Arcstarter wrote ...
Can you say RIDICULOUS?!
Why can't you just make your own CT? Heck, you could even use a shunt if there was not thousands of volts on the primary.
Just get a ferrite transformer and make a CT. The only problem is that it is not split core, so you have to thread the wire through it. Unless, of course, you somehow made it split core... Hmm... That could be done with a U core transformer i suppose. You could also use a current transducer. I have one that i need to figure out. (its 400 amps 5v)
A neat trick for winding 100+ turns onto a ferrite core is to first wind the wire onto a pencil or other thin object, which fits through the ferrite core, then start wrapping the wire by looping the pencil through the core while unwinding the wire on the pencil, makes life much easier. :)
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Goodchild wrote ...
Thanks the resone im looking for a none home made CT is that I have tryed many times to build a CT but none of them seem to give accurate readings.
EDIT: But if some one here has some nifty way to calibrate a home built CT I would be glad to know.
Well, if you take a core, such as one from electronics goldmine, and use one turn for the primary and 100 turns for the secondary, with a 1 ohm burden, you should always get 1v/10 amps. Calibration can be done by inserting a paralleled potentiometer, and you could use a resistive shunt to get the exact current, then adjust the pot accordingly. Also, make sure you use quality resistors for the burden, make sure they are low tolerance and carbon film, any inductance might interfere.
I used a 1-200CT with a 2 ohm burden, and it seemed to be pretty exact when compared with a 500 amp shunt. You can this video out. I am measuring a drsstc primary current with the CT.
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Scope current transformer for DRSSTC use
Unless, of course, you somehow made it split core... Hmm... That could be done with a U core transformer i suppose. You could also use a current transducer. I have one that i need to figure out. (its 400 amps 5v)
