Question
Download Solution PDFThree similar coils are connected in star when connected to a three-phase AC supply, drawing a line current of 10 A. kVA and KW inputs are 30 and 18, respectively. What are the resistance and reactance of the coil, respectively?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The total apparent power in a three-phase system is given by:
The active power in a three-phase system is:
where, VL = Line Voltage
IL = Line current
IP = Phase current
Calculation
Given, S = 30 kVA
P = 18 kW
VL = 1732 V
For a star connection, the phase voltage is:
VP = 1000 V
The impedance per phase is given by:
R = 60 Ω
X = 80 Ω
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