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Unformatted text preview: Q.2: A 1000HP, Y-connected motor is connected to a 3500 V (line-to-line), 3-phase, 60 Hz line. If the motor produces a total output of 746 HP at an efficiency of 90 % and a power factor of 85% lagging, calculate (a) the total real power absorbed by the motor; (b) the total reactive power absorbed by the motor; (c) the line current. If a delta connected capacitor bank is connected to the line to improve the power factor to 95 % lagging, calculate the size of the capacitor bank per phase. Also calculate the new line current. V an V cn V bn Z Φ Z Φ Z Φ Z Φ = 4.2 Ω j 2.4 Ω 216 V 4.2 Ω j 2.4 Ω 4.2 Ω j 2.4 Ω Figure 1: Three-phase circuit for Q.1...
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- Spring '09