Grounded B Phase vs 3Phase 4Wire Systems
Grounded B Phase vs 3Phase 4Wire Systems
(OP)
What, if any, is the percentage of efficiency, plus or minus,of a 480 volt Grounded 'B' 3 phase 3 wire system as compared to a 277/480 volt 3 phase 4 wire system?






RE: Grounded B Phase vs 3Phase 4Wire Systems
RE: Grounded B Phase vs 3Phase 4Wire Systems
RE: Grounded B Phase vs 3Phase 4Wire Systems
Forth or fifth order response, yes. The power through the insulation admittances will be about half what it now is if you change. My guess is that any money spent to make the change will never be recovered through the savings achieved.
There are probably much better safety arguments to be made for making that change than operational efficiency.
RE: Grounded B Phase vs 3Phase 4Wire Systems
RE: Grounded B Phase vs 3Phase 4Wire Systems
Many small business find this useful.
3 wire systems use less copper wire and therefore cost less to install. Which is an advantage to companys that don't have 277v lighting load, and have greater distances to transmit the power (oil field is a good example).
RE: Grounded B Phase vs 3Phase 4Wire Systems
I assume that even though you reference a 4-wire 277/480 volt system, you wouldn't actually install a neutral unless it were needed. If it were needed, then the 3-wire 480 volt system would not work.
The difference in dielectric loss mentioned by davidbeach would not, at 480 volt, be enough to pay you for the time in asking the question.