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A 150 km long, 3-phase, 400 kV overhead line is used to transmit 1800 MW to a distribution area at 0.9 power factor lagging. The line parameters per phase and per unit length in standard notation are as follows: r = 0.017 Ω/km, x = 0.27 Ω/km and y = j10.58 μS/km. Using the medium-line representation method and pi-equivalent circuit, calculate:
a) The required sending-end voltage.
b) The power loss in the line.
c) The efficiency of the transmission.
A 4000-V, 5000-hp, 60-Hz, 12-pole synchronous motor, with a synchronous reactance of 4 per phase (based on cylindrical-rotor theory), is excited to produce unity power factor at
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A 0.1µF capacitor is charged to 200 V before being connected across a 4 kΩ resistor. Determine: (a) The initial discharge current (b) The time constant of the circuit
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