So I think this will be easy for some of you. I feel like it should be easy for me but I can't quite wrap my head around it.
I'm looking at a building that is served by three power conductors from three separate pole mounted transformers. One of the main switchboards has only two conductors going to it, and the other has three. Clearly single phase and three phase, but I want to understand what the voltages are.
The pole transformers are set up like this:
Transformer 1 - Conductor out and connected to XF 3 / Ununsed / Connected to XF 2
Transformer 2 - Connected to XF 1 / Ground / Conductor out and connected to XF 3
Tranformer 3 - Connected to XF2 / Unused / Connected XF3
In my mind this would give two conductors that are 120V to ground and 180 degrees apart - so single phase 240. How does that third conductor make the other panel three phase? It seems like the third phase couldn't possibly be 120 degrees out...
Am I missing something?
Thanks!
I'm looking at a building that is served by three power conductors from three separate pole mounted transformers. One of the main switchboards has only two conductors going to it, and the other has three. Clearly single phase and three phase, but I want to understand what the voltages are.
The pole transformers are set up like this:
Transformer 1 - Conductor out and connected to XF 3 / Ununsed / Connected to XF 2
Transformer 2 - Connected to XF 1 / Ground / Conductor out and connected to XF 3
Tranformer 3 - Connected to XF2 / Unused / Connected XF3
In my mind this would give two conductors that are 120V to ground and 180 degrees apart - so single phase 240. How does that third conductor make the other panel three phase? It seems like the third phase couldn't possibly be 120 degrees out...
Am I missing something?
Thanks!