A balanced 3 phase star supply with a line voltage of 415V, 50Hz is connected to a balanced load having resistance of 10Ω and inductor of 42mH connected in series. Find (a) total power using two wattmeter method and power factor if the balanced load is connected in a star configuration, (b) total power using two wattmeter method and power factor if the balanced load is connected in a delta configuration.
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connected to a balanced load having resistance of 10Ω and inductor of 42mH connected in series. Find (a) total power using two wattmeter method and power factor if the balanced load is connected in a star configuration, (b) total power using two wattmeter method and power factor if the balanced load is connected in a delta c
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Power P=5000W,
line voltage VL = 400 V,
line current, IL = 8.6A and
power, P =√3 VLIL cos φ
Hence
power factor = cos φ = P √3 VLIL
= 5000 √3 (400) (8.6)
= 0.839
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