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sigal phase supply is 230 v ac
two phase supply is 415 v ac
why three phase supply is 415 v ac why not 690 v ac
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Answer Posted / vasi
If Phase-Neutral voltage is 230v then Phase-Phase voltage in
3ph system willbe sq.root of 3 X 230v
The 3 ph are displaced 0-120-240 degrees and the Pitagor
Theorem can be used to count up the Line voltage
Another way to count up the Line(Phase-Phase) voltage is to
use vector analysis
1st Phase 0 degree 230+j0
2nd Phase 120 degrees cos120*(230) + sin120*(230) this gives
-115+j199
3rd Phase 240 degrees cos240*(230) + sin240*(230) this gives
-115-j199
in the end ph1-ph2 398v, ph1-ph3 398v, ph2-ph3 398v
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