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# Problem with FEMM

- To: femm@yahoogroups.com
- Subject: Problem with FEMM
- From: "zifera <emiliano.menghi@inwind.it>" <emiliano.menghi@inwind.it>
- Date: Mon, 06 Jan 2003 22:33:07 -0000
- User-agent: eGroups-EW/0.82

    Dear David and Femm users, i've a big problem with Femm and i hope
    that you want help me.
    I use FEMM to computate the shielding effectiveness (low frequency:
    50-60 hetz) of plane aluminium screen (tickness 3 mm, lenght 2 m).
    The source is a triphase cable system with simmtric current (500 A).
    The distance between the conductor is 25 cm. The position of the
    screen is simmetric respect the conductors (the conductors are in
    plane)
    The problem is that near the screen the magnetic field (calculated
    along a line parallel to the sceen) is not simmetric!! For distance
    bigger than 50 cm magnetic field return to be simmetric. Why?
    I've tested the same configuration with a commercial fem (Ansoft) and
    the result is equal.
    Thanks.

    Emiliano

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    - From: "David Meeker <dcm3c@earthlink.net>" <dcm3c@earthlink.net>

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