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An Odd Ball

Discussion in 'System Modeling and Calculations' started by JPJ, Sep 14, 2009.

  1. JPJ New Member

    Is there anyone here who can help me please,

    i have a need to try an calculate the AC single phase Arc energy (230v - 20amps upto 470Amps at 50Hz)
    I then need to replicate this "Arc energy" at DC at 220volts

    Its a totally different application from switchgear and i know most of you would say its to low however i need to try and model this

    thanks

    Jas
    JPJ, Sep 14, 2009
    #1

  2. THE CABLE GUY Well-Known Member

    :confused:
    Sorry, out of my league. Sounds like you need someone with the Canadian or European calculations.
    THE CABLE GUY, Sep 14, 2009
    #2

  3. JPJ New Member

    Thanks anyway Martin.

    i was wondering if i just used VA's, weather or not this would be representative in getting the idea across that an DC Arc is worse than an AC one.

    say for instance we pick up load at 230v 420A 50Hz rms (ignoring vectors fro the time being)

    That would be 96.6KVA however if the Arc lasted for 1.5s then 1/50 x1.5 = 0.03.
    therefore 96600 x 0.03 = 2.9KVA for the duration of the Arc.

    If i did the same test on DC (as the AC is rms so should be equivalent to DC)

    230V x 420A = 96.6KVA

    However with the Arc lasting a 1.5s this equates to 144.9KVA for the duration of the Arc.

    so to get similar values at DC as those in AC
    :confused:
    2900VA / 1.5 = 1933.3 / 420A = 4.6volts
    or / 230v = 8.4Amps
    :confused: so i think i need a different approach

    ( this is assuming that the distance and time it take to close the arc is constant)
    JPJ, Sep 15, 2009
    #3

  4. Vincent B. Well-Known Member

    Why 1/50 x 1.5? That's only 1.5 cycle, quite far from the original 1.5 second...
    Vincent B., Sep 15, 2009
    #4

  5. JPJ New Member

    Ah! its always better to read a post first:eek:
    JPJ, Sep 15, 2009
    #5

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