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example 4 12
(a)
total current 433.01 -286jA
overall power factor 0.834 lagging
copper losses in synchrounous motor 6250W
copper losses in cable 24.25KW
(b)
total current 433.01 -178jA
overall power factor 0.925 lagging
copper losses in synchrounous motor 6250W
copper losses in cable 19.73KW
(c)
total current 433.01 -94jA
overall power factor 0.977 lagging
copper losses in synchrounous motor 6250W
copper losses in cable 17.67KW
(d)
copper loss of synchronous motor this is evidently minimum when tand=0 cosd=1
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