challenger
Stainless
- Joined
- Mar 6, 2003
- Location
- Hampstead, NC-S.E. Coast
I've built a 10hp RPC. Everything went well and I had been running it for test purposes-w-only the A-C legs having capacitors on it of 120MF. The unloded voltages were AB-244 AC 241 & BC-255 (I may have the A & B voltage mixed up). I increased the A-C to 160 and got the exact same voltages on all 3 legs. In looking at the Fitch design I then started adding caps to B-C and got an imbalance of 20 volts between all three legs 244/251/261. This was still within the Fitch tolerance so I figured I would add Cpf. I put a 20mf on A-B and got over 270 volts on one leg (I forget which). I thought putting a load on would help but only had a 1/2hp motor to try and this actually made for a larger imbalance so I got pissed off and called it a night.
My question is, given I understand this is trial and error, what is the relationship between increasing the sizes of the capacitors and the resulting outcome? Do the caps raise or lower the voltage? In addition I wonder why we measure between legs and not just to ground? This seems to me like the best way to find out what each leg is doing.
Lastly when this design raises the input voltage (A/B-which I cannot for the life of me understand as it is coming form the power co. right?) isn't this increasing the voltage in the whole house?
Thanks - Howard
Hampstead, NC
My question is, given I understand this is trial and error, what is the relationship between increasing the sizes of the capacitors and the resulting outcome? Do the caps raise or lower the voltage? In addition I wonder why we measure between legs and not just to ground? This seems to me like the best way to find out what each leg is doing.
Lastly when this design raises the input voltage (A/B-which I cannot for the life of me understand as it is coming form the power co. right?) isn't this increasing the voltage in the whole house?
Thanks - Howard
Hampstead, NC