3phase ac generator dual voltage

Guest,

If you can get the thing spinning, apply minimal excitation and take some voltage readings, you can figure out the field wiring and phasing if you know what you are doing.

Not knowing anything more about you than that you can sorta type and get on the internet, I am not going to tell you any more for fear of contributing to your timely or untimely demise.

TT3

Most alternator manufacturers make 12 lead reconnectable alternators, if the phase leads are 3 individual leads its most likely setup for 480 volt output, you could take the reconnection chart mark your leads and reconnect them, where your going to get into trouble is the the voltage regulator sensing and power leads, they will be connected in with those 12 leads, are you up to that kind task.

hi, thanks for your reply

as i can see its connected on low voltage 240v, because each phase there are two leads connected together and the other six leads are connected together as neutral.

the problem now, for example two leads are connected to phase no 1, which should be leads 1 and 7. the question is which lead is no 1 and which is no 7?

thanks

Guest

As Turbotroll said,

you may apply a small DC voltage on excitation, ( you disconnect the field from AVR if there is any) , you will get a small AC voltage on the 6 coils, carrefully you can check with an oscilloscope the phase and magnitude of each coil, so you will know wich one to be connected in parallel or in serie with which one .

hi, thanks for your reply

would you please explain to me how to check polarity of the coil, i mean which is the live and which is the neutral

thanks

there is no live or neutral. once you checked the phasing, you can decide wich coil to connect to groung to be neutral