A three-phase, 440 V system has the following load connected in delta: between the red and yellow lines, a non-reactive resistor of 200 Ω; between the yellow and blue lines, a coil having a reactance of 160 Ω and negligible resistance; between the blue and red lines, a loss-free capacitor having a reactance of 250 Ω. Two wattmeters are used to measure the total power drawn by the three-phase load. Wattmeter One has its current coil connected in the red line, and its voltage coil connected across the red and yellow lines. With the aid of a clearly labelled diagram, calculate: The phase currents, The line currents, The power read by each wattmeter,The total power measured by the two wattmeters, The power drawn by the resistor and Compare your answers for parts (iv) and (v) above and provide an explanation for your findings.
A three-phase, 440 V system has the following load connected in delta: between the red
and yellow lines, a non-reactive resistor of 200 Ω; between the yellow and blue lines, a
coil having a reactance of 160 Ω and negligible resistance; between the blue and red
lines, a loss-free capacitor having a reactance of 250 Ω. Two wattmeters are used to
measure the total power drawn by the three-phase load. Wattmeter One has its current
coil connected in the red line, and its voltage coil connected across the red and yellow
lines. With the aid of a clearly labelled diagram, calculate:
The phase currents, The line currents, The power read by each wattmeter,The total power measured by the two wattmeters, The power drawn by the resistor and Compare your answers for parts (iv) and (v) above and provide an explanation for your findings.
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