The voltages in the three phase power system are produced by a synchronous generator. In a balanced system, each of the three instantaneous voltages have equal amplitudes but separated from other voltages by a phase angle of 120 degrees. The three voltages are typically labeled a, b and c. The common reference point for the three phase voltages is designated as the neutral connection and is labeled as n. We may defined either a positive phase sequence or a negative sequence. The three sources Van, Vbn, and Vcn are designated as the line to neutral voltages in the three phase system.
ABC sequence
line to line voltage
-the voltage differences between the phases.
Vab = Van-Vbn
Vbc = Vbn-Vcn
Vca = Vcn-Van
Line to neutral voltage
Van = Vp∠0
Vbn = Vp∠-120
Vcn = Vp∠+120
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