The contract load of a medium scale Industry (MSI) at 11 kV, 50 Hz is 0.8 MW, but the maximum demand of that industry in last two years has not exceeded 0.6 MW at average power factor of 0.75, while as per Oman electricity norms power factor must be maintained 0.92 to avoid any penalty. Find the following: i) Capacitor rating to avoid power factor penalty ii) The capacitance of the capacitor bank 13 ELEC4242-Power System Quality

The contract load of a medium scale Industry (MSI) at 11 kV, 50 Hz is 0.8 MW, but the maximum demand of that industry in last two years has not exceeded 0.6 MW at average power factor of 0.75, while as per Oman electricity norms power factor must be maintained 0.92 to avoid any penalty. Find the following: i) Capacitor rating to avoid power factor penalty ii) The capacitance of the capacitor bank 13 ELEC4242-Power System Quality

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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q5
(e) The load in milling factory is having active and reactive power of 100 kW and 59.33 kVAr, respectively at voltage supply of 415 V. A capacitor bank system (PFC) with voltage rating 515 V is to be installed with the target to increase the power factor to 95%. The PFC has the step arrangement of 1:1:2:2:3:3 with 5 kVAr for each capacitor unit. (i) Analyse the average power factor and the minimum effective reactive power, Os injected into supply system. (ii) Examine the effective reactive power, Qceff to be supplied by capacitor bank and the total unit steps of power factor corrector to be (iii) Estimate the actual average power factor for the system based on the unit step recommended in Q(e)(ii). (iv) Justify the implication of total unit steps of power factor corrector if 3.3kVAr per unit of capacitor is to be used in the factory.
An air blast circuit breaker is designed to interrupt a transformer magnetising current of 15 A (rms) chops the current at an instantaneous value of 10 A . If the value of L & C in circuit are 35.2 H and 0.0023 µF, then the voltage that appears across the contacts of the breaker is A 100 kV B C 1432.8 kV 1237.2 kV D 962.3 kV
I need the answer for all 6 sub questions
3. A 12020⁰ Vrms is to supply power to a welder, heater and an induction motor. A welder is a coil of (4+j3) ohm, the induction motor draws 60KW with 0.8 power factor, and the heater is a resistor that draws 15KW power. Find the complex power, real power, reactive power and the total power factor that must be supplied by source. If a capacitor will be used to supply a reactive power in the circuit in order that the net load will have a unity power factor, what reactive power must be supplied by the capacitor? Draw the circuit.
5.5 kW, 1450 rpm. L-type equivalent circuit and parameters for a continuous sinusoidal phase of a star connected 3-phase ASM with line voltage 220 V and frequency 50 Hz are given as follows, ignoring core (iron) losses: R1=0.21 Ohm, R2=-0.18 Ohm, X1=X2-0.66 Ohm and Xm = 9.9 Ohm How many times the inrush current will be the rated current when the ASM is started directly? Answer options group 8.0815 2.6455 4.3763 7.1534 1.2558 6.3414 5.2280 3.7473
For a power station the yearly load duration curve is a straight line from 50,000 to 4000 kw. To meet the load three turbo-generators are installed. The capacity of two generators is 16,000 kw each and the 3rd is rated at 7,000 kw. Determine the following a) Load factor. b) Capacity factor. c) Maximum demand.
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Problem 4
1. Consider a building with a real power demand of 650 kW and reactive power demand of 480 KVAR. Determine the current power factor and then find the required size of a set of capacitors to be installed in parallel with the building service entrance so that the power factor becomes at least 0.90.
For all of the Questions use 4 most significant digits after the decimal point (e.g.: ) 1. A three-phase load draws 720 kW from the grid with 0.8 lagging power factor. The load is balanced and star connected. For reactive power compensation, a bank of capacitors is connected in star across the load terminals. With this compensation, active power loss across the lines is reduced 10% (Meaning that If the power loss is 1 unit before compensation, power loss is 0.9 unit after compensation). Assuming that compensation does not change the load terminal voltage, calculate a) b) c) The kVAr rating of capacitors in each phase The improved power factor The new power factor if the same bank of capacitors is connected in delta Hint: The power loss across the line is proportional to the line current and hence the apparent power.
In an installation there is a three-phase load of 300 kVA with a power factor of 0.8 behind, in parallel with a three-phase load of 150 kVA with a power factor of 0.6 ahead. A pure reactive element is connected in parallel, and a unity power factor is obtained at the power input. Indicate the reactant of the element, with a positive sign if it is a bank of reactors, or with a negative sign if it is a bank of capacitors. Just put the corresponding sign followed by the numerical value, without units. The numerical value must correspond to the three-phase kVARS. You can use integer values with no decimal places or up to two decimal places