Q23. The average load of a dairy plant at 11 kV, 50 Hz is 950 kW at 80% power factor, but the maximum contract load of plant is 1200 kW. As per local electricity regulating authorities norms consumer must maintain a power factor of 95% to avoid non-compliance power factor penalty. What will be capacitance (in micro farad) of a capacitor bank required to install to meet the requirement?? (a) 10.60 (c) 13.29 (d) None of the option (b) 11.19

Q23. The average load of a dairy plant at 11 kV, 50 Hz is 950 kW at 80% power factor, but the maximum contract load of plant is 1200 kW. As per local electricity regulating authorities norms consumer must maintain a power factor of 95% to avoid non-compliance power factor penalty. What will be capacitance (in micro farad) of a capacitor bank required to install to meet the requirement?? (a) 10.60 (c) 13.29 (d) None of the option (b) 11.19

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 2.11P

See similar textbooks

Similar questions

Let a series RLC network be connected to a source voltage V, drawing a current I. (a) In terms of the load impedance Z=ZZ, find expressions for P and Q, from complex power considerations. (b) Express p(t) in terms of P and Q, by choosing i(t)=2Icost. (c) For the case of Z=R+jL+1/jC, interpret the result of part (b) in terms of P,QL, and Qc. In particular, if 2LC=1, when the inductive and capacitive reactances cancel, comment on what happens.
Consider two interconnected voltage sources connected by a line of impedance Z=jX, as shown in Figure 2.27. (a) Obtain expressions for P12 and Q12. (b) Determine the maximum power transfer and the condition for it to
Consider a load impedance of Z=jwL connected to a voltage and V let the current drawn be I. (a) Develop an expression for the reactive power Q in terms of ,L, and I, from complex power considerations. (b) Let the instantaneous current be i(t)=2Icos(t+). Obtain an expression for the instantaneous power p(t) into L, and then express it in terms of Q. (c) Comment on the average real power P supplied to the inductor and the instantaneous power supplied.
Let a voltage source v(t)=4cos(t+60) be connected to an impedance Z=230. (a) Given the operating frequency to be 60 Hz, determine the expressions for the current and instantaneous power delivered by the source as functions of time. (b) Plot these functions along with v(t) on a single graph for comparison. (c) Find the frequency and average value of the instantaneous power.
Under balanced operating conditions, consider the three-phase complex power delivered by the three-phase source to the three-phase load. Match the following expressions, those on the left to those on the right. (i) Realpower, P3 (a) (3VLLIL)VA (ii) Reactive power, Q3 (b) (3VLLILsin)var (iii) Total apparent power, S3 (c) (3VLLILcos)W (iv) Complex power, S3 (d) P3+jQ3 Note that VLL is the rms line-to-line voltage, IL is the rms line current, and is the power-factor angle.
A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)
A 15kVA, 440V, single-phase alternator draws a field current of 5A at rated load. With the same field current, the open circuit emf and short-circuit current are 100V and 80A respectively. The ohmic resistance of the armature between terminals is 0.12 ohm. The ratio of effective to ohmic resistance maybe taken as 1.1. Determine the voltage regulation (in %) when the load is purely resistive.
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.
1. A motor load consists of a resistance of 6 Ohms in series with an inductance of 12 mH. Assume 120Vac, 60 Hz supply. a. What is the complex impedance of the load? b. What is the ac current through this load? c. What is theta, the angle between voltage and current through this load? d. What is the power factor? e. What capacitance should be added in parallel with this load to correct the power factor to 1? f. What is the current from the supply when the power factor is corrected?
A 100KVA, 220V, a star-connected alternator is loaded at full load and at 60% pf lagging.The effective AC resistance per phase is 0.01411Ω. If the synchronous reactance is 4.5times the effect of the armature leakage reactance wherein the later is 0.046 Ω perphase, find(a) the phase voltage that would be generated at the load if the circuit were operating normally(b) What no-load open-circuit phase voltage must be present in order to circulate full-load current in short-circuit state while maintaining the same speed and field current?(c) What is the terminal phase voltage of the alternator when it is under a shorted load condition? Give an explanation in support of your response using just one sentence. The IA phasor should be used as the reference one.
q13/ choose the correct answer The variation of the load is considered over a period of one year in an annual load curve. Select one: True False
You own a factory that uses several conveyor belts and other motor-driven machineries. Upon measuring the factory's apparent power requirement and power factor, it turns out that it runs at 15 MVA at 0.7 lagging of; therefore, it is too inductive! To avoid electrical code violations, the factory must operate at a pf of at least 0.9 lagging. If the factory is connected to 34.5 kV AC at 60 Hz, what is the size of the compensating capacitor that must be installed to achieve the desired pf level? Express the answer in microfarads. The given voltage can be assumed to be at angle zero.