pebe said:
Hi Sarac,
Your circuit is nearly right for what I described as Method 2 (sensing the maximum current in any phase). But you don’t need R1, R2, R3. Instead, connect the +ve output pins of all the bridge rectifiers together and connect them to the +ve of C1. C1 will then charge to the highest phase. You can use the op-amp output (as in the link) for the third phase. Construct it exactly as they show.
BTW, you need load resistors on the CTs – it is most important.
Pebe.
Pepe, Sebi thnks for the reply,
I have redrawn the schema as per Pepe's correction. I assume that parrallel connection of the bridges would be more accurate then the serial connection. I have also included a ground connection ( like shown, in the link )
Regarding details Pepe ask,
1- CTs turn Ratio are 250/5 ( 1/50 ) each
2- Generators producing 380v / 220v
3- Generators are 132 KVA
4- CT Load resistor's value = not known, I'm also wondering the value of
the resistors too.
now, my questions are
1- Would the modified schema work as desired ?
2- What will be the resistors value? ( i.e. R1,R2 and R3 )
3- What will be the Cap's value?
plase advise and correct me if anything seems wrong.
Then i will construct the circuits to blow up the generators
( hope not )
thnks again