POWER SYS. ANALYSIS+DESIGN
6th Edition
ISBN: 9780357700907
Author: Glover
Publisher: INTER CENG
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Chapter 2, Problem 2.5P
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Each phase of star-connected load consists of a resistance of 100 ohms in parallel with a capacitance 31.8µF. Calculate the line current, power absorbed, total kVA and power factor of the load when connected to a 416V, 3phase, 4 wire 50Hz supply
Three identical capacitors are connected in Delta to a 415V, 50Hz, 3-phase supply. If the line current is 15A, calculate the Capacitance of the each capacitor.
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Use Van as the reference.
Calculate the line current,( Ia) in polar form.
Chapter 2 Solutions
POWER SYS. ANALYSIS+DESIGN
Ch. 2 - The rms value of v(t)=Vmaxcos(t+) is given by a....Ch. 2 - If the rms phasor of a voltage is given by V=12060...Ch. 2 - If a phasor representation of a current is given...Ch. 2 - Prob. 2.4MCQCh. 2 - Prob. 2.5MCQCh. 2 - Prob. 2.6MCQCh. 2 - Prob. 2.7MCQCh. 2 - Prob. 2.8MCQCh. 2 - Prob. 2.9MCQCh. 2 - The average value of a double-frequency sinusoid,...
Ch. 2 - The power factor for an inductive circuit (R-L...Ch. 2 - The power factor for a capacitive circuit (R-C...Ch. 2 - Prob. 2.13MCQCh. 2 - The instantaneous power absorbed by the load in a...Ch. 2 - Prob. 2.15MCQCh. 2 - With generator conyention, where the current...Ch. 2 - Consider the load convention that is used for the...Ch. 2 - Prob. 2.18MCQCh. 2 - The admittance of the impedance j12 is given by...Ch. 2 - Consider Figure 2.9 of the text, Let the nodal...Ch. 2 - The three-phase source line-to-neutral voltages...Ch. 2 - In a balanced three-phase Y-connected system with...Ch. 2 - In a balanced system, the phasor sum of the...Ch. 2 - Consider a three-phase Y-connected source feeding...Ch. 2 - For a balanced- load supplied by a balanced...Ch. 2 - A balanced -load can be converted to an...Ch. 2 - When working with balanced three-phase circuits,...Ch. 2 - The total instantaneous power delivered by a...Ch. 2 - The total instantaneous power absorbed by a...Ch. 2 - Under balanced operating conditions, consider the...Ch. 2 - One advantage of balanced three-phase systems over...Ch. 2 - While the instantaneous electric power delivered...Ch. 2 - Given the complex numbers A1=630 and A2=4+j5, (a)...Ch. 2 - Convert the following instantaneous currents to...Ch. 2 - The instantaneous voltage across a circuit element...Ch. 2 - For the single-phase circuit shown in Figure...Ch. 2 - A 60Hz, single-phase source with V=27730 volts is...Ch. 2 - (a) Transform v(t)=75cos(377t15) to phasor form....Ch. 2 - Let a 100V sinusoidal source be connected to a...Ch. 2 - Consider the circuit shown in Figure 2.23 in time...Ch. 2 - For the circuit shown in Figure 2.24, compute the...Ch. 2 - For the circuit element of Problem 2.3, calculate...Ch. 2 - Prob. 2.11PCh. 2 - The voltage v(t)=359.3cos(t)volts is applied to a...Ch. 2 - Prob. 2.13PCh. 2 - A single-phase source is applied to a...Ch. 2 - Let a voltage source v(t)=4cos(t+60) be connected...Ch. 2 - A single-phase, 120V(rms),60Hz source supplies...Ch. 2 - Consider a load impedance of Z=jwL connected to a...Ch. 2 - Let a series RLC network be connected to a source...Ch. 2 - Consider a single-phase load with an applied...Ch. 2 - A circuit consists of two impedances, Z1=2030 and...Ch. 2 - An industrial plant consisting primarily of...Ch. 2 - The real power delivered by a source to two...Ch. 2 - A single-phase source has a terminal voltage...Ch. 2 - A source supplies power to the following three...Ch. 2 - Consider the series RLC circuit of Problem 2.7 and...Ch. 2 - A small manufacturing plant is located 2 km down a...Ch. 2 - An industrial load consisting of a bank of...Ch. 2 - Three loads are connected in parallel across a...Ch. 2 - Prob. 2.29PCh. 2 - Figure 2.26 shows three loads connected in...Ch. 2 - Consider two interconnected voltage sources...Ch. 2 - Prob. 2.35PCh. 2 - Prob. 2.36PCh. 2 - Prob. 2.37PCh. 2 - Prob. 2.38PCh. 2 - Prob. 2.39PCh. 2 - A balanced three-phase 240-V source supplies a...Ch. 2 - Prob. 2.41PCh. 2 - A balanced -connected impedance load with (12+j9)...Ch. 2 - A three-phase line, which has an impedance of...Ch. 2 - Two balanced three-phase loads that are connected...Ch. 2 - Two balanced Y-connected loads, one drawing 10 kW...Ch. 2 - Three identical impedances Z=3030 are connected in...Ch. 2 - Two three-phase generators supply a three-phase...Ch. 2 - Prob. 2.48PCh. 2 - Figure 2.33 gives the general -Y transformation....Ch. 2 - Consider the balanced three-phase system shown in...Ch. 2 - A three-phase line with an impedance of...Ch. 2 - A balanced three-phase load is connected to a...Ch. 2 - What is a microgrid?Ch. 2 - What are the benefits of microgrids?Ch. 2 - Prob. CCSQCh. 2 - Prob. DCSQ
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- 34. A 33 kV, 50 Hz network has a capacitance to neutral of 1.0 µF per phase. Calculate the reactance of an arc suppression coil suitable for the system to avoid adverse effect of arching ground.arrow_forwardA 3- phase star connected load has resistance of 4 Ω, inductance of 15.9mH & a capacitive reactance of 6 Ω respectively in R B & Y phases. If the load is connected to 400V, 50Hz supply, i. Calculate the neutral current .ii. Find the total power absorbed by the load.iii. Draw the current phasorsarrow_forwardThree coils each having resistance 6 and inductance LH areconnected in delta, to a 415V, 50Hz, 3-phase supply. If the linecurrent is 30A, fine the value of L.arrow_forward
- A coil of wire having a value of (5 + j8) ohms is connected in series with a capacitive reactance Xc, and this series combination is then connected in parallel with a resistor R. If the equivalent impedance of the circuit is 4 /0o ohms, calculate the values of Xc and R.arrow_forwardA transmission line of impedance (0.05 + j0.02) pu interconnects the buses of a switchyard and a bulk supply point. The receiving end apparent power is (1.0 + j0.6) pu and sending end voltage, 1/0°pu. Estimate the following: i) Receiving end voltage after two iterations ii) Perform two further iterations to test the convergence of the value of receiving end voltage deduced in (i) iii) load currentarrow_forwardA capacitor having reactance of 5.0 per unit is connected between the reference node and bus 2 of the circuit below. The original [Zbus] is also given. The original emf corresponding to bus 2 is V2 = 0.9534 angle -20.1803° per unit. Find 1. Draw Thevenin equivalent circuit at bus 2. 2. Calculate current drawn by the capacitor. 3. Calculate new Zbus after adding new capacitor.arrow_forward
- A 3-phase balanced star connected inductive coil load, each of reactance 22 ohms are connected to a 3 phase 210V, 50 Hz supply. Calculate the inductance of each coil, which when connected in delta to the same supply will take the same line current. Reactance Xc is = The Inductance L =arrow_forwardCalculate the equivalent impedance of a circuit where a coil of (5H, angle 53.2 Deg.) ohms is connected in parallel with a capacitive reactance of 6.25 ohms.arrow_forwardThe impedance of an electrical circuit is (30 − j50) ohms. Determine (a) the resistance, (b) the capacitance, (c) the modulus of the impedance, and (d) the current flowing and its phase angle, when the circuit is connected to a 240V, 50 Hz supply.arrow_forward
- 1. Three equal impedances each having a resistance of 14 omh and inductance of 32 mH are connected in star to a 415, 3-phase 5OHZ system. Calculate (i) the line current (ii) phase current (iii) power consumed.arrow_forwardA 3-phase, 50 Hz, 3000 V motor develops 600 H.P. (447·6 kW), the power factor being 0·75 lagging and the efficiency 0·93. A bank of capacitors is connected in delta across the supply terminals and power factor raised to 0·9 lagging. Each of the capacitance units is built of five similar 600-V capacitors. Determine the leading Kvar taken by each three sets.arrow_forwardGiven a mesh connected system with reactive factor of 60 percent and true power of 2,500 kW. Calculate the reactive powerarrow_forward
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