Problem 3 phase systems

Discussion in 'Homework Help' started by needs, May 9, 2010.

  1. needs

    Thread Starter New Member

    Mar 30, 2010
    Hi I have a question,

    when comparing results with from 2 or 3 watt meter methods, why is it necessary to disconnect the neutral?

  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    In the two watt meter connection method the two required line-to-line voltages are connected to the potential coils on the individual watt meters. So you don't need a neutral connection. The meter potential coil must therefore be rated for the supply line-to-line voltage.

    The three meter method is a 4-wire arrangement with each meter potential coil connected between line (phase) and supply neutral.