2 phase 5 wire
- Thread starter domnic
- Start date
- Status
StephenSDH
Senior Member
- Location
- Allentown, PA
Two single phase center tapped transformers with the center tap tied together and 90 degrees out. I believe I have this correct others can chime in.
SparkyHC
Member
- Location
- Southern New Jersey
"Scott T"
"Scott T"
We spent a few years working on two-phase systems in Philadelphia...in fact they are still in use around center city. Do a search for a "Scott T" connection which was the identification for the winding configuration of transformers.
Primary was 2400 volt single phase - two separate sets which power two single winding transformers with secondary connection configuration called "Scott T".
The secondary has (4) phase legs and a (120V) neutral common to all (4).
phase A to B = 240V phase C to D = 240 but measure between A or B to C or D and you'll get a (forgive the expression) bastard voltage that is not usable.
just for fun...two phase elevators needed the correct (4) letter sequence connections before they would operate!
Harry in NJ
"Scott T"
Two single phase center tapped transformers with the center tap tied together and 90 degrees out. I believe I have this correct others can chime in.
We spent a few years working on two-phase systems in Philadelphia...in fact they are still in use around center city. Do a search for a "Scott T" connection which was the identification for the winding configuration of transformers.
Primary was 2400 volt single phase - two separate sets which power two single winding transformers with secondary connection configuration called "Scott T".
The secondary has (4) phase legs and a (120V) neutral common to all (4).
phase A to B = 240V phase C to D = 240 but measure between A or B to C or D and you'll get a (forgive the expression) bastard voltage that is not usable.
just for fun...two phase elevators needed the correct (4) letter sequence connections before they would operate!
Harry in NJ
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