3w,1ph vs 3w,2ph?

[kholland]

What is the difference between 3-wire,single-phase and 3-wire,two-phase?

 

[bennie]

Re: 3w,1ph vs 3w,2ph?

One phase.

 

[kholland]

Re: 3w,1ph vs 3w,2ph?

So..an example of 2ph would be 2 hots,1 neut and 1ph would be 2 hots, 1 ground?

 

[bphgravity]

Re: 3w,1ph vs 3w,2ph?

A two-phase system consists of two currents that differ in phase by 90 degrees. (3-Phase is 120 degrees)

For Single Phase: W = E x I x pF

For Two-Phase: W = 2E x I x pF

For 3-Phase: W = E x I x 1.732 x pF

What is bad about Two-Phase systems, is that even with a balnced load, the current on the center-tap is 1.41 times the phase conductors.

 

[kholland]

Re: 3w,1ph vs 3w,2ph?

Thanks Bryan,
The part about them being obsolete was what I needed. Now I am sure that I never seen one.
Thanks to you and all of the other guys here for sharing your time and talent.
kholland

 

[michael nye]

Re: 3w,1ph vs 3w,2ph?

I've never heard of 2 phase, how outdated is the system and what was it used for.