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"Jerry" wrote in
news:s5Ivk.448$sq3.441@trnddc07: .... I realize that you have asked this question to Richard, who is far better prepared to answer than I am. But, it seems that you are confused about how two sine waves add. Maybe I am wrong, and you do know how two sine wave voltages generated at different times and are connected in series combine to being other than 180 degrees from terminal to terminal. All the 208 power lines I am familiar with *are* 208 from terminal to terminal when each leg is 120 "terminal to center". Where did you get the "240"? Jerry KD6JDJ Jerry, in the three wire system with 180° phase difference between Line1 and Line2 wrt Neutral (the centre wire) the voltage Line1 wrt Line2 is exactly twice the Line1 to Neutral voltage. You probably don't use the word Neutral over there, it is the word used for four wire three phase systems and it is equally applicable for a three wire two phase system where the Neutral wire carries the "imbalance" current. None of this is a good analogy to a two wire open transmission line at radio frequencies, principally because the length of conductors at power frequencies is usually a very small part of a wavelength and can be approximated well using a simpler analytical model than the traditional 'Telegrapher's' equations applied to transmission lines. Those who resort to explaining radio frequency transmission lines and transformers using 60Hz models need to justify the accuracy / limits of the approximation. The low frequency model does not explain high frequency roll-off in RF transformers and inductors, so it is clearly incomplete. Almost all of this discussion is using lumped circuit analysis (a low frequency model) to explain not just transmission lines, but conductors with significant mutual coupling (the nominal radiator and its feedline). Owen |
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