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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Dumb "current transformer" questions
Ignoramus29580 wrote:
Let's say that I have a cable and I want to measure the AC current going through it. Up to, say, 100 amps. I could use a current transformer, right? If I have a say 200:1 current transformer, then on a 100 amp AC current it would want to produce a 0.5 amp current. Then if I stick, say, a 1 ohm resistor across it, it would produce 0.5*1 = 0.5 volts AC across the resistor. Is that right? Yes, assuming that you haven't exceeded the primary or secondary current ratings for the transformer. Furthermore, since you're probably looking to use it on your tig welder inverter, the transformer probably should be rated to be accurate for pulse work rather than just 60hz sine waves. Here's more than you want to know about CT's: http://www.kappaelectricals.com/technical.html#current Oh, and don't ever leave the secondary open with a load in the primary.... |
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