S searley Senior Member Joined Sep 12, 2008 Messages 320 Reaction score 0 May 26, 2009 #1 could somebody show me the formula for this question ? a 3 phase 400vlt delta connected motor draws a line current of 27.5A a full load at a power factor of 0.78 lagging. determine the total power ? cheers.
could somebody show me the formula for this question ? a 3 phase 400vlt delta connected motor draws a line current of 27.5A a full load at a power factor of 0.78 lagging. determine the total power ? cheers.
J Jono Pashley Well-known member Joined Oct 18, 2008 Messages 1,250 Reaction score 20 May 26, 2009 #2 Voltage stays the same Phase current would be IL/1.73 giving 15.877A per phase 15.877x3 = 47.63A 400 x 47.63 x 0.78 = 14.86KW or 14860.872W Easier Calculation P = root3 x VL x IL x PF
Voltage stays the same Phase current would be IL/1.73 giving 15.877A per phase 15.877x3 = 47.63A 400 x 47.63 x 0.78 = 14.86KW or 14860.872W Easier Calculation P = root3 x VL x IL x PF
