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For a three-phase delta connected load, fed from a star connected network, the power transferred to the load is
  • a)
    3 KW
  • b)
    7 KW
  • c)
    5 KW
  • d)
    7KW
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
For a three-phase delta connected load, fed from a star connected netw...
Given values:
Star Connected phase voltage, Vphs = 230 Volts
Phase load resistance, RphLd = 20 Ohms
Phase load reactance, XphLd = 40 Ohms
Hence, phase load impedance, = 
Star connected line voltage, VL =√3Vphs = 398.37 Volts
For the delta connected load, Phase Voltage, VphLd = VL = 398.37 Volts
Therefore, current through each phase of load, IphLd = VphLd/ZphLd = 8.9 Amperes
Line current for delta connected load, IL =  √3IphLd = 15.41 Amperes
Power Factor, pfs = RphLd/ZphLd = 0.44
Thus, power supplied to load, PL =√3 VLILpfs = 4.7 KW
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Most Upvoted Answer
For a three-phase delta connected load, fed from a star connected netw...
Given values:
Star Connected phase voltage, Vphs = 230 Volts
Phase load resistance, RphLd = 20 Ohms
Phase load reactance, XphLd = 40 Ohms
Hence, phase load impedance, = 
Star connected line voltage, VL =√3Vphs = 398.37 Volts
For the delta connected load, Phase Voltage, VphLd = VL = 398.37 Volts
Therefore, current through each phase of load, IphLd = VphLd/ZphLd = 8.9 Amperes
Line current for delta connected load, IL =  √3IphLd = 15.41 Amperes
Power Factor, pfs = RphLd/ZphLd = 0.44
Thus, power supplied to load, PL =√3 VLILpfs = 4.7 KW
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