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Thread: Large HP VFD output on switcboard bus

  1. #1
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    Large HP VFD output on switcboard bus

    I need to connect the output of a large regen. VFD (2,600HP, 690V) to a switchgear bus in order to direct power (via PLC controlled breakers) to either 1) a large M-G set or (2) a large motor test stand...up to 2500HP @ 690V. Owner wants the ability to use the drive for either load.

    VFD rated output is as follows:

    I(max) = 3680A (10-sec at start)
    I(2N) = 2362A (Normal duty use, continuous base current, Overload cycle I(2N) 110% for 1-min / 5-min allowed
    I(2HD) = 1840A (Heavy duty use, continuous base current, Overload cycle I(2HD) 150% for 1-min / 5-min allowed

    I'm not an expert on drives (these are owner provided) Preliminary design is to use a 4,000A, IEC gear, 690V. Does anyone know of any concerns with this large VFD "non-sinusoidal" output on a swichgear bus?...or any considerations to be aware of for the circuit breakers?

    Note: This is a motor test lab....would never have a need for this in industry.

  2. #2
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    So serious issues in that regard, should be fine. The nonlinear current would not be an issue if all you are doing is burning it off somewhere as a load.

    My concern would be if the MG set will have enough impedance for this though. Most regen drives need that, but that is a question for the drive mfr.
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