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# Re: [femm] Modelling a three phase short circuit of a Synchronous machine.

- To: femm@egroups.com
- Subject: Re: [femm] Modelling a three phase short circuit of a Synchronous machine.
- From: David Meeker <dmeeker@foster-miller.com>
- Date: Tue, 23 Jan 2001 17:35:35 -0500
- Organization: Foster-Miller, Inc.
- References: <94hr28+111iq@eGroups.com>

    "C.Prem Kumar" wrote:

    > Hello there !
    >
    > I am interested in simulating a balanced three phase short circuit of
    > a Synchronous generator for determining the Short Circuit Ratio. Can
    > any one help me on how to go about it ?
    >
    > Many thanks in advance.
    >
    > C.Prem Kumar

    You can't really do this with femm right now. Simulating this test would
    actually require some sort of stepped integration over time in which the
    rotor is spinning--femm only does magnetostatic problems and harmonic
    problems in which the physical configuration is fixed. Since the source
    code to femm is available, it would be possible to "hotwire" the code to
    do time transient problems, but it would require some fairly extensive
    modifications. I'm hoping to get around to adding this sort of
    capability at some point, but I probably won't get to it in the near
    future.

    However, I understand that the main purpose of this sort of short-circuit
    test to infer the machine's reactance. With femm, you can set up a
    series of magnetostatic simulations and determine inductance directly for
    various rotor orientations. This might allow you to get the information
    that you are after without actually having to perform the short-circuit
    test on the numerical model.

    Dave.

    N.B.--A sort of interesting paper that examines performing a
    short-circuit test on a synchronous generator via finite element
    simulation is: S. Nabeta, et al., "A non-linear time-stepped
    finite-element simulation of a symmetrical short-circuit in a synchronous
    machine," IEEE Transactions on Magnetics, 31(3):2040-2043, May 1995.

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- References:
  - Modelling a three phase short circuit of a Synchronous machine.
    - From: "C.Prem Kumar" <prem@rnd.bhel.co.in>

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