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Mains Overvoltage Transients and the mains inductance

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by Flyback, Jul 15, 2017.

  1. Flyback

    Flyback Well-Known Member

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    Hello
    How do we assess which value of mains wiring inductance to use for our investigation of mains transients on our outdoor electric lights?
    The schematic and LTspice simulation of our situation is as attached.

    The following says that impedance of the mains in UK is 0.25+j0.23 ohms
    http://www.acoustica.org.uk/other/mains_Z.html
    That means that the mains inductance depends on the frequency. So which value do we use?
     

    Attached Files:

  2. Dick Cappels

    Dick Cappels Member

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    No. It means that mains impedance depends on frequency. The impedance is the square root of the sum of the impedance squared plus the resistance squared.
     
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  3. Flyback

    Flyback Well-Known Member

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    Thanks, as you know, the energy stored in the mains wiring inductance when current flows in it is ultimately what causes mains transients. We are trying to get to know what value we can give for mains wiring inductance in our simulation of the top post. Then we can see how to mitigate these mains transients.
     

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