difference between 3 phase 3 wire system and 3 phase 4 wire system
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3 Phase 3 wire system includes all the phases i.e R Y and B while in 3 phase 4 wire system an additional neutral N is present. 4 wire system is mainly used in distribution side to convert the 3 phase system into single phase to supply single phase household loads,where the neutral acts as the current return path.it is done by connecting the secondary side of the distribution transformer in star.
3 wire system used specially for transmission as it is more economic. also used in 3 phase motors, delta connected loads.
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