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How Transmission Lines Transposition could affect Protection systems?

  1. Nov 14, 2010 #1
    I would like to know if Transposition on Transmission Lines could affect the basis and the way the power system is evaluated to set up the protection for the Transmission line? as compared to the non-transposed Transmission Lines.

    Thanks in advance,

  2. jcsd
  3. Nov 14, 2010 #2


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    Are you referring to the fact that an open circuited quarter wave line will present a short circuit at the input? (etc.) It's enough of a problem to make it worth while using DC for long distance power transmission.
  4. Nov 14, 2010 #3
    I'm Talking about Long AC Transmission Lines, not DC in this case. Thanks.

    Transposition is done regularly in long AC transmission lines as a means of balancing transmission line frequency impedance and admittance in a long line, and that contribute to unbalance voltages. This is usually done in double circuit AC long transmission lines...
  5. Dec 17, 2010 #4
    I want to why TEM waves are not supported by transmission lines? and where is the point of difference in using waveguides and transmission lines?
    Thanx in Advance.
  6. Dec 17, 2010 #5
    They do. See http://en.wikipedia.org/wiki/Transmission_line
    This is why RG-8 has a characteristic impedance of Z=50 ohms, for example.

    Bob S
  7. Dec 17, 2010 #6
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