A lo ac-dc full converter is used to control the speed of a dc motor, as shown in Fig. 10.21. The molor parameters are Ra = 0.25 N, kąð = 0.1 V/rpm, and La is sufficiently large. The converter is fed from a lø, 120 V, 60 Hz supply. For a = 60°, the motor current is continuous, and motor average current is 20 A, and the ripple current is 20%. (a) Draw waveforms of supply voltage (v), supply current (i), output voltage (vo), and output current (ig). (b) Determine the speed of the motor in rpm. (c) Detcrmine the power lost in the armature resistance and the power developed by the motor. (d) Determine the supply power factor. S2

A lo ac-dc full converter is used to control the speed of a dc motor, as shown in Fig. 10.21. The molor parameters are Ra = 0.25 N, kąð = 0.1 V/rpm, and La is sufficiently large. The converter is fed from a lø, 120 V, 60 Hz supply. For a = 60°, the motor current is continuous, and motor average current is 20 A, and the ripple current is 20%. (a) Draw waveforms of supply voltage (v), supply current (i), output voltage (vo), and output current (ig). (b) Determine the speed of the motor in rpm. (c) Detcrmine the power lost in the armature resistance and the power developed by the motor. (d) Determine the supply power factor. S2

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.21P: An industrial plant consisting primarily of induction motor loads absorbs 500 kW at 0.6 power factor...

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An example power system has two distinct manufacturing areas, one with harmonic loads, and another with only linear loads. The portion of the system with the harmonic loads draws 75 A rms at 60 Hz, 10 A rms at 300 Hz, and 5 A rms at 420 Hz. The part of the system with only linear loads draws 75 A rms at 60 Hz. (i) What is the total load current (at 60 Hz) if both manufacturing plants are running? Calculate the THD. (ii) What is the total load current (at 60 Hz) if only the manufacturing plant with harmonic loads is running? Calculate the THD.
2) The net inlet to a factory powered by a 2300 volt infinite busis measured as 765 A, for a lag 0.92 power factor. although mostloads is inductive, the input power factor has been improved by installing asynchronous capacitor operating at its nominal value of 1000 KVA. Determine the factor oforiginal factory power.
If vt = 230cis40degrees. determine the equivalent impedance.
: A single phase motor operating off a 400V, 50Hz supply is developing 10KW with an efficiency of 84% and a power factor (p.f) of 0.7 lagging. Calculate; The input apparent power; The active and reactive components of the current; The reactive power (in kilovars).
Electromechanical energy conversion (One AC induction motor and one AC synchronous motor were operated connected to an infinite bus of 600V. Power factor of the induction motor is 0,7 (lagging) and consumes 400 W from the bus. Synchronous motor consumes 300 W from the bus. If the power factor of the synchronous motor is 0,9 (lagging) find the line current from the bus, for the total of two motors (IL total 1) of the line that connects the motors with the bus and find the total appearent power (SL total 1) of the motors consumed from the bus. When the induction motor has the same conditions, if the power factor of the synchronous motor is 0,9 (leading) find the line current from the bus, for the total of two motors (IL total 2) of the line that connects the motors with the bus and find the total appearent power (SL total 2) of the motors consumed from the bus.
For the system given below, Rf=10000 ohm, Ki=0.0125 Nm/A, J=10-6 kg.m2, n=800, Kb=0.0125V/(rad/second), Ra=6.25 ohm, Ks=0.1 A/ rad, with B=0 Nm/(rad/second); Determine the K value for the 9.9% overshoot.Calculate the time of overshoot that will occur for this situation.
Q6: An AC source operating at 60 Hz with a maximum voltage of 170 V is fed to a series combination of1.2kΩ resistor and 2.5μF capacitor connected in a timer circuit. How can you evaluate the maximumcurrent in the circuit? Can you estimate the rms value potential difference across each circuit element?Compare the power factor of this timer circuit with a circuit contain only ohmic resistance. Justify youranswer?
Consider you have a network connected to a 100V,ms AC supply with an Ims of 10A and a power factor of 0.4 lead. What must be the power added to make the power factor 0.9 leading using power factor correction?
A motor draws 680 W at 156 Vrms 60Hz. The motor is operating at a lagging power factor, with a power factor angle of 45 deg.. Determine the capacitance (in microFarad) required to correct the power factor so that the power factor angle becomes 15 deg, lagging. (Give answer in 2 decimal places. Unit is not required)
The load at a certain factory consists of the following:10 kW, pf = 0.6 lagging15 kW, rf = 0.5 lagging25 kVA, pf = 0.75 lagging15 kVAR, pf = 0.8 lagging22 kW5 kVAR, pure inductance1. The power factor is to be corrected to 0.95 lagging. If a synchronous motor is to be used instead, determine the real power rating of this motor if its power factor is 0.6 leading. Ans = 18.257 2. The power factor is to be corrected to 0.95 lagging. If resistive heating units were used instead, determine the real power rating of these devices. Ans = 92.3222 3. The power factor is to be corrected to 0.95 lagging. The power factor is to be corrected to 0.95 lagging. Determine the kVAR rating of pure capacitors needed to accomplish this. Ans = 30.3447
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Your company is considering the installation of a 2 MW wind turbine with a rotor diameter of 90 m in a location with average wind v = 8.5 m/s. The turbine has a cut-in velocity of 5 m/s and a cut-out velocity of 25 m/s. The capacity factor is 0.45. The installed cost of the turbine is $3,500,000. Operating expenses are $225,000 per year. The system has a power coefficient (electric power generated divided by wind power) of 0.45. What price would you have to get for the electricity you produce to obtain a 10% return on the plant investment assuming a project lifetime of 20 years? Use the tables for the cumulative wind power distribution in the notes on wind probability to answer this question. Assume an air density of 1.225 kg/m3.