3. A power supply is having the following loads : Diversity of Demand Type of load Max. demand (kW) group factor Domestic 1500 1.2 0.?? Commercial 2000 1.1 0.?? Industrial 10000 1.25 1 If the overall system diversity factor is 1-35, determine (i) the maximum demand and (ii) Connected load of each type. Hinds: 0.??=Last two digits of your ID. Use 0.11 years only if your last digit is 00.

3. A power supply is having the following loads : Diversity of Demand Type of load Max. demand (kW) group factor Domestic 1500 1.2 0.?? Commercial 2000 1.1 0.?? Industrial 10000 1.25 1 If the overall system diversity factor is 1-35, determine (i) the maximum demand and (ii) Connected load of each type. Hinds: 0.??=Last two digits of your ID. Use 0.11 years only if your last digit is 00.

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

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.31P

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To convert a per-unit impedance from old to new base values, the equation to be used is Zp.u.new=Zp.u.old(VbaseoldVbasenew)2(SbasenewSbaseold)Zp.u.new=Zp.u.old(VbaseoldVbasenew)2(SbasenewSbaseold)Zp.u.new=Zp.u.old(VbaseoldVbasenew)2(SbasenewSbaseold)
What is the purpose of power factor correction to a given load? O To reduce the amount of voltage to the load. O To reduce the amount of dependence on automated machinery. O To reduce the amount of current to the load. O To reduce the amount of resistance of the load.
2. a) Explain the terms load factor and diversity factor. b) Discuss the advantages of interconnected grid system. c) A generating station is to supply four regions of load whose peak loads are 10 MW, 5 MW, 8 MW and 7 MW. The diversity factor at the station is 1-5 and the average annual load factor is 60%. Calculate: (i) the maximum demand on the station, (ii) annual energy supplied by the station and (iii) suggest the installed capacity and the number of units.
In a given system of base power of 250 MW, and bus 3 is taken as reference. The per-unit reactances are X12 = 0.2 p.u., X13 = X23 = 0. 1 p.u. The power flow in the system is given as: PF12 = 50 MW, PF13 = 150 MW, PF23 = 50 MW. Based on readings from 2 meters (not including M12 meter), M13 = 145 MW (not calibrated), and M23 = 50 MW (well calibrated), deduce the flow on line 1-2. Select one: O a. PF12 = - 47.5 MW. O b. None of these O c. PF12 = 67.5 MW. O d. PF12 = 47.5 MW. O e. PF12 =- 57.5 MW. O f. PF12 = 57 MW.
OR e) What is BILS? Explain their significance in power system studies.
The figure below shows the one-line diagram of a four- bus power system. The voltages, the scheduled real power and reactive powers, and the reactances of transmission lines are marked at this one line diagram (The voltages and reactances are in PU referred to 100 MW base. The active power P2 in MW is the last three digits (from right) of your registration number (i.e for the student that has a registration number 202112396, P2 =396). [10] Starting from an estimated voltage at bus 2, bus 3, and bus 4 equals V2 (0) = 1.15<0°, V3 = 1.15 < 0°, V4 1.1< 0°. 1- Specify the type of each bus and known & unknown quantities at each bus. 2- Find the elements of the second row of the admittance matrix (i.e. [Y21 Y22 Y23 Y24]). 3- Using Gauss-Siedal fınd the voltage at bus 2 after the first iteration. 4- Using Newton-Raphson, calculate: |- The value of real power (P2), at bus 2 after the first iteration. Il- The second element in the first row of the Jacobian matrix after the first iteration. 2 P2…
Q5. Answer the following: Explain the power factor using a voltage and current waveform. How the power factor has the adverse effects on the power system quality. What are triplen harmonics? Why these are significant or what are there consequences on transformer and the machines? Explain the five types of voltage disturbances using waveforms, which affect the power quality in distribution system.
Power factor PF PF=______________ Define the units of VA and VAR?
7. In the circuit below write the loop equations and set up (not solve) the matrix equation for the load current. Wiso 150 75 28 100
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Problem 2 The circuit diagram of a certain load is presented below. Determine the following: a. The power factor of the load. b. If the load is connected across a 400 Vrms source, determine the real and reactive power consumed by the load. c. From (b), determine the value of the capacitor to be placed in parallel with the load in order to improve the power factor of the load to 95% lagging. From (b), A synchronous motor is installed in parallel with the load to correct the pf. The motor is rated 5 hp operating at 60% efficiency. Assuming that the motor is running at rated power. Determine the apparent power and power factor of the motor in order to improve the load's pf to 95% lagging. 202 500 µF HI + VL -20 mH 5Ω >0.5VL m 15 mH
As seen in the figure, three generators of 800 kW, 900 kW and 1000 kW are connected in parallel. It generators feed 380 kW load. Frequency-active power graphs of generators are shown as given. According to this; a. Calculate the operating frequency for the situation given in the question.b. Calculate the power transferred by the generators to the load.c. A three-phase asynchronous load of 800 kW and 600 kVA with a reverse power coefficient of 0.78 is installed in the system. engine is connected. The new operating frequency of the system and the active power of the alternators. calculate.d. Do you think the generators in this system are suitable for parallel connection as in the figure?