CKnight

[CKnight]

Thank you for replying.

I thought about the graphs supplied by the course video and the one in a previous reply of yours (#17451) that shows the sine wave of 240 volts AC. I was able to settle in my mind that it is unnecessary for me to deal with the primary side of the source transmissions signals (or high voltage “pressure”). I think I was over-analyzing what the input and output signals might be from having a small hobby of basic electronics and transformers. Trying to reverse-engineer the diagram, I suppose.

So, I have wrestled with some thoughts in my mind and understand better what is happening in the L1, L2, neutral, and ground lines. I had eventually pictured in my mind what I think you all are showing. The positive and negative charges alternating to generate the phases (not to mention anything yet about current flow) with respect to neutral. Also, that the 240 volt sine wave does not actually exist, but it is a sine wave based on voltage changes over the time period on a graph without respect to neutral. I hope that I am making sense.

Thank you for that file of a more detailed manual. I usually like to look at technical illustrations first.

Thanks again.

[CKnight]

I called a friend, an electrician, and we talked over the phone. He found a few graphs online for me to view. I think the graph showing the three sine waves might need some clarification for others, including myself, that might have difficulties in understanding the processes involved to produce voltages and to be able to correctly graph each phase.

Am I correct in saying, for example, that the black 240 volt AC sine wave was superimposed over the two 120 volt phases? If I am, I think I would have understood more easily what was being displayed in the graph if that black sine wave was indicated it was superimposed.

Also, if the black 240 volt AC sine wave was placed on the primary side of a transformer drawing, I think I would have understood more easily that the two L1 and L2 phases were the resulting voltages on the secondary side of the transformer with respect to neutral (that is to say, a center-tapped transformer).

Is what I have written correct? Does it seem to you that I am correctly understanding this material?

I would appreciate any corrections and/or suggestions.

Thank you,
CKnight

[CKnight]

Thank you for the quick reply. I will think about what you said.

I will try to send the link of the graph here for you to view.

[CKnight]

Also, should not there be only two sine waves in that graph and not three?

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