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Does phase voltage lead or lag line voltage?
Does phase voltage lead or lag line voltage in a phasor diagram? Or does it depend on which voltage (line or phase) you are taking reference to? I am a bit confused on this leading or lagging voltage stuff.
Can someone out there plz explain to me? I would really appreciate your help. Thank you and 10 pts to the best answer!
Yes, this is confusing. But the confusion arises out of the use of non-specific terminology.
A three phase system has three phase-to-neutral voltages that are (usually) equal in magnitude and displaced by 120 electrical degrees. These are sometimes casually referred to as 'phase voltages' (although 'phase-to-neutral voltage' is a better term.)
A three-phase system also has three phase-to-phase voltages that are also (usually) equal in magnitude and displaced by 120 electrical degrees. These voltages either lead or lag the phase-to-neutral voltages depending on which phase-to-neutral voltage you choose as reference and how you define phase-to-phase voltage (ie, phase A-B voltage is numerically equal to phase B-A voltage, but they are 180 degrees out of phase with each other). The term "line voltage" is sometimes carelessly equated with the more exact term 'phase-to-phase voltage'.
So, bottom line is that once you get a clear definition of what you mean by the terms you are using, and also a clear definition of how 'phase-to-phase voltage' is defined, then the lead/lag relationship can be described. Otherwise, you have only confusion.
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