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Tapping in power systems

  1. Jul 29, 2015 #1
    1. The problem statement, all variables and given/known data
    What is meant by the term tapping in power system , I studied in my textbook that generally from feeders no tapping is taken to the consumers , therefore current loading of feeder remains the same along its length. I was not getting what is being referred here ..?


    2. Relevant equations


    3. The attempt at a solution
    I am familiar with the tapping we use in case of transformer which is the varying the number of turns , which further changes the voltage ratio.. Is this the same sense tapping in power supply system is being used??
     
    Last edited by a moderator: Aug 4, 2015
  2. jcsd
  3. Jul 29, 2015 #2
    Unless there is a definition I am not aware of, tapping is exactly what you describe.

    Primary substation transformers (generally) have on-load tap changers via a diverter and a large number of taps. There are many methods to automatically control the tap when you have two or more transformers in parallel - master/slaves; TAPP ; circulating current etc...

    Secondary substation transformers and pole-mounted transformers have off load tap changers and just a few taps (usually about 5) which are set when the transformer is installed. Off load is a bit of a misnmoer, becasue the transformer has not only to be off load but isolated.
     
  4. Jul 30, 2015 #3

    NascentOxygen

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    Staff: Mentor

    Based on what you provide here, I would conclude that tapping refers to connecting a couple of wires to take power to the premises of each consumer along the route. Where consumers take current from a power line, there will be a drop in remaining current as you progress away from the power station. It's saying that feeders don't have consumers tapping on along the route; feeders carry power between networks, and it is the local network that is responsibe for distributing that power to consumers.
     
  5. Jul 30, 2015 #4
    In 20 years in the power industry (UK) I have never heard that defintion of tapping

    what you describe is called a CONNECTION.
     
  6. Jul 31, 2015 #5

    NascentOxygen

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    Perhaps ranju could indicate which country his textbook was written for?
     
  7. Jul 31, 2015 #6
    that would be helpful!

    You may very well be right, I've just never heard a (consumer) connection called a tap before
     
  8. Jul 31, 2015 #7

    Nidum

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    One origin of the term tapping in comes from the time when telegraph signals were carried long distance with a single wire and earth return . After making a connection at a remote location operator 'tapped in' a Morse code sequence to tell the master operators that the connection was live . Phrase later came to be used more generally to denote making ad hoc connections to any system .

    Same root as phone tapping .
     
  9. Jul 31, 2015 #8
    thats fine

    but utility companies don't make ad hoc connections; and tapping has a defined meaning: the operation of a tap changer.

    If, in a power systems context, tapping is being used to mean anything other than the operation of a tap changer; then that is very shoddy indeed.
     
  10. Aug 4, 2015 #9
    Well.. Its written in India..
     
  11. Aug 5, 2015 #10
    well, I googled

    india power system tapping

    and it came up lots of articles about stealing power....

    maybe the OP needs to ask someone who works in India?
     
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