ADWSystems
Member
Please read my blog #18.
Instead of using 2 CTs in chain you can look for CT with turns ratio of 1:5000 or 1:1000 and 25A primary. They are available.
Alternatively if you take a 5VA transformer of lets say 120v to 12v the primary will have about 2000 turns. wind around the primary or secondary one turn of 25A wire and you have your home made CT. Because you don't know the number of turns you will have to put known current through the 1 turn, and measure the voltage on 100 ohm resistor across the primary (the 120V terminals, the 12V terminals aren't used at all) . The number of turns is the ratio of the current through the 1 turn to the current through the resistor.
2 CTs in a chain? You lost me.
I know there are other turn ratios available. I was trying the computation with the 50:5 that Ron had on hand. As this is a home project it is about low cost and using what I have or can get easily. (for work it is another story, the customer pays all the bills...usually)
P.S. What blog? I don't see any entries.