I have a question ..!!

Discussion in 'General Electronics Chat' started by ALI AMEER, Jan 8, 2011.

  1. ALI AMEER

    Thread Starter New Member

    Jan 8, 2011
    1
    0
    HI ..

    first i would like to thank you for all your explanation and hard work.I have a small question..
    what is meant by y-delta connection (joining y and delta in the same motor) ??
    i heard that this connection is good for starting because of the lower currant in delta-configuration than in Y-configuration

    thank you .
     
  2. GetDeviceInfo

    Senior Member

    Jun 7, 2009
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  3. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
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    Your supply and driven device dictates this more than anything. I'm pretty much totally 480V Y at work, in other words I've got 480V between the phases but can grab 277V to neutral from any one to feed lighting. Can't say that I've got a motor that even has a neutral on it, just earth ground through the conduit or, if I've added it, a separate earth ground wire in the conduit.

    There's a reason for transmitting power in three phase, that's why you usually see three wires on the poles above you.
     
  4. Hagen

    Active Member

    May 8, 2010
    30
    1
    Wye-Delta starting is used when it is desirable to reduce the inrush current on a 3 phase motor to minimize line disturbances, and sometimes to provide a soft start. The motor has at least 6 leads brought out and the windings are connected via a special multi-contactor starter in a wye configuration to start, then after a time delay, connected in delta for running at full horsepower. Starting torqe and starting current are both reduced by a factor of 3.
     
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