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Overhead Lines vs Power Cables - Question on Insulation

  1. Feb 5, 2013 #1
    Hello I have a very basic question.

    I'm studying power cable engineering right now and I've learned about the role of insulation in a cable to reduce dielectric losses and charging current losses, but I don't understand what this means exactly. Here are my questions..

    1. Is the insulation basically reducing the voltage from building up outside of the conductor and creating leakage current?

    2. I'm trying to understand what would happen without insulation in a power cable. Why do we need insulation? And why do overhead power lines just have bare wires without any insulation? How does this effect power losses?

    3. Why can overhead transmission lines transmit at higher voltage levels that power cables?

    Any help would be greatly appreciated. I am preparing for an exam and this is my weakspot :(
    Last edited: Feb 5, 2013
  2. jcsd
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