On Apr 14, 6:01 pm, Roy Lewallen wrote:
Walter Maxwell wrote:

Consider my two explanations, or definitions of what I consider a virtual short--perhaps it should have a
different name, because of course 'virtual' implies non-existence. The short circuit evident at the input of
the two line examples I presented---do you agree that short circuits appear at the input of the two lines? If
so, what would you call them?

I'd call them "virtual shorts". If they were short circuits, we should
be able to connect a wire across the transmission line at that point
with no change in transmission line operation. But we can't. While
things will look the same on the generator side, they won't be the same
beyond the real short. So they aren't short circuits.

I want to bring up another reason to be very careful to even call them
"virtual shorts." They are virtual shorts only at certain
frequencies. To me, that is a very important distinction. Keeping
that frequency dependence in mind helps me be ever aware that they are
not anything like a real short.

Cheers,
Tom