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- The amplitude of the voltage Vs (t) is 2 1/2 150 volts, the phase angle isQs = 0 degrees, its period is T = 200Pi microseconds.Since R = 300 ohms and C = 1 pico farad:a)If L0 = OH constant, find the value of R0 that enables the load to draw the maximum average power from the circuit.b) Calculate the complex power on the loA single phase 11 kV line with a length of 15 km is to transmit 500 kVA. The inductive reactance of the line is 0·5 Ω/km and the resistance is 0·3 Ω/km. Calculate the efficiency and regulation of the line for 0·8 lagging power factor. [97·74%, 3·34%]It is desired to correct the 2,400-kVa 0.65 lagging power factor load in a plantto unity by the installation of a synchronous condenser. Calculate the kilovoltampere rating of the latter. Ans.: 1824 kVA
- A 3-phase overhead transmission line is being supported by three disc insulators. The potentials across top unit and middle unit are 9 kV and 11 kV respectively. Calculate: a. The ratio of capacitance between pin and earth to the self-capacitance of each unit. b. The line voltage. c. String efficiency. JAns: a. 0.22 b. 35.444 kV c. 76%]The amplitude of the voltage Vs (t) is 2 1/2 150 volts, the phase angle isQs = 0 degrees, its period is T = 200Pi microseconds.Since R = 300 ohms and C = 1 pico farad:a)If L0 = OH constant, find the value of R0 that enables the load to draw the maximum average power from the circuit.b) Calculate the complex power on the load.A three-phase synchronous Y-mounted alternator with constant excitation, driven by a turbine. This alternator runs at no load at 1500 rpm and delivers Vφ =230V and f=50Hz, Rs=1ΩCalculate the reactance Xs
- If a 3- Ø, Y-connected system has a line-to-line voltage of 1103Sin(377t) V, then the line-to-neutral (RMS) voltage would be:The three-phase average power rating of the central processing unit (CPU) on a mainframe digital computer is 22,659 W. The three-phase line supplying the computer has a line voltage rating of 208 V. The line current is 73.8 A. The computer absorbs magnetizing VARs. 1. a) Calculate the total magnetizing reactive power absorbed by the CPU. 2. b) Calculate the power factor.A three phase, 60 Hz transmission line delivers 20 MW to a load at 66 kV at 80% pf lagging. The total series impedance of each line is 15 + j75 ohms. If a nominal pi circuit is used, what would be the transmission efficiency if the admittance is j0.0006 mhos?
- A 3-phase induction motor is connected across a 220V three-phase source. A wattmeter reads 600W when its current coil is connected in line 1 and its potential coil across line 1 and 2. If the potential coil of the wattmeter is transferred to lines 2 and 3, the reading of the wattmeter is the same. Calculate the power factor of the motor.Three-phase, 50 Hz, 132 KV power system of equivalent impedance 10+j35 12 with load 110+j29 12. Draw the corresponding power flow diagrams with total values. Use one-digit approximation.Q21) A 3-phase star connected alternator supplies a delta connected load, each phase of which has a resistance of 15Ω and inductive reactance of 20 Ω. If the line voltage is 400V, and frequency 50Hz, i) Calculate The output power of the alternator. ii) Calculate the KVA rating of the alternator.