He doesn't need a neutral connection because the 3 phases are 120° apart and all 3 legs have the same impedance.
A.sin(ωt) + B.sin(ωt + 120°) + C.sin(ωt + 240°) = 0 whatever ω and t as long as A = B = C (identical impedances)
He doesn't need a neutral connection because the 3 phases are 120° apart and all 3 legs have the same impedance.
A.sin(ωt) + B.sin(ωt + 120°) + C.sin(ωt + 240°) = 0 whatever ω and t as long as A = B = C (identical impedances)