SOME PROBLEMS

Some Problems

1. A balanced three phase load is connected star/wye, absorp the electric power 50 kVA at 0,9 lagging power factor. If the line voltage at loads 400 Vrms, the one phase voltage at loads 230 Vrms.

          a. Determine the line current also the value of a MCCB in panel as protection for this load?     
          b. Determine the value of the multicore aluminium conductor cable size between MCCB with this
              load? see table of aluminium cable!
          c. Determine the value resistance and reactance for every the one phase load?
          Answer :

         a. IL = 72,3 A and MCCB = 100 A
            b. NaXY 4 X 50 mm  
         c. R = 4,16 ohm ( resistance) and X = 2,03 ohm ( reactance)