2/3 watt meter problem

Discussion in 'Homework Help' started by needs, May 8, 2010.

  1. needs

    Thread Starter New Member

    Mar 30, 2010
    16
    0
    Hi,

    I have problems on 3 phase systems,

    what is the purpose of connecting the load star point to the supply neutral current while setting currents taken from supply?
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    You tie the load star point to neutral to ensure the line-to-neutral load voltages are equivalent to the supply line-to-neutral voltages. A floating star point on an unbalanced (in particular) 3-phase load would lead to imbalance of the load line-to-star point voltages and hence unexpected load phase current values. It's sound procedure.
     
  3. needs

    Thread Starter New Member

    Mar 30, 2010
    16
    0
    Ohh Thanks very much!! i have another question when comparing results with the 2 or 3 watt meter methods, why is it necessary to disconnect the neutral?


    thanks alot!!
     
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