If you assume that the phase voltages are equal and opposite you can wire current transformers in series - multiply the current you measure by 110 rather than 220V. And get e polarity right (!)
QuoteIf you assume that the phase voltages are equal and opposite you can wire current transformers in series - multiply the current you measure by 110 rather than 220V. And get e polarity right (!)Thanks, and I gather that if you didn't get the polarity right, you'd see seriously out-of-whack results (i.e. it wouldn't damage anything in particular or cause a fire). I'm pretty sure a voltmeter/ammeter will be able to sort this out before you wire it into an actual circuit.I intend to do most of the breadboarding and proof-of-concept using "light bulb" loads for 120V and perhaps rigging both a symmetric and an asymmetric 240V load (though I will have to put in a 240V circuit in order to do that, I have a sub panel in my workshop with which I can make that happen).
Hello nearby bay area arduino fan!
I think the two CTs with secondary wired in series is going to give some problems. Household power as you stated around here is split phase 220. There is a L1, L2, and a neutral wire. All the 110 circuit breakers are usually wired alternately to the L1 and L2 buses and neutral and any 220 loads are wired just to L1 and L2 branches. So if you have a CT on each of L1 and L2 and series their outputs that would give you a total of what all the 110 branches are consuming, however won't the 220volt loads be 'double counted' in that scheme, as the 220 load current will be passing through both CT's?
I would figure that the 180º phase difference between the legs would work in favor of tying them together. Perhaps parallel instead of serial...?I wish I had paid more attention in physics...--R
A split phase electricity distribution system is a 3-wire single-phase distribution system, commonly used in North America for single-family residential and light commercial (up to about 100 kVA) applications. It is the AC equivalent of the original Edison 3-wire direct current system.