12. A certain load takes 300 kW at 400 V. A three phase capacitor bank rated 15 kVA per phase is connectedin parallel with the load to raise the power factor of the system to 90% lagging. What is the power factor ofthe load before correction?c. 92%d. 88%a. 99%b. 95%13. A 132 kV line three phase system delivers 70.7 MVA on a balanced delta connected load of a power factor70.7% lagging. Determine the reactance necessary to attain unity power factor.a. 1 092 ohmsc. 1142 ohmsd. 1 045 ohmsb. 965 ohms14. A 150 kVA transformer bank will serve a load expected to draw 135 kW at 0.80 lagging power factor.Solve for the size of the capacitor bank needed to be added in order to prevent overloading of thetransformer bank.a 40.391 KVARd. 28.266 KVARa. 32.506 KVARb. 35.866 KVAR

As per our policy, i have attempted 1 question Given data Reactive power of capacitor is QC=15 kVA…

12. A certain load takes 300 kW at 400 V. A three phase capacitor bank rated 15 kVA per phase is connected in parallel with the load to raise the power factor of the system to 90% lagging. What is the power factor of the load before correction? a. 99% c. 92% b. 95% d. 88%

12. A certain load takes 300 kW at 400 V. A three phase capacitor bank rated 15 kVA per phase is connected in parallel with the load to raise the power factor of the system to 90% lagging. What is the power factor of the load before correction? a. 99% c. 92% b. 95% d. 88%

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 2.47P: Two three-phase generators supply a three-phase load through separate three-phase lines. The load...

See similar textbooks

Related questions

Q: A balanced three-phase source supplies a balanced delta load having 39 angle -40° Q per phase. The…

A: The solution is given below

Q: 1 12 kVA at power factor of @ the average calculate 0.86 agging from a sinusui dal source. and…

Q: 2) A 30- resistor, a 15-0 inductive reactance, and a 12- capacitive reactance are connected in…

A: In this question, We need to determine the current in the each Branch, total current and impedance…

Q: (a) the full load efficiency at unity power factor;

Q: A three-phase motor draws 9 kVA at a lagging PF of 0.8 from a balanced system with line voltages of…

Q: .A balanced 40 Ohms Y-connected load is connected to a 480V (line voltage), three phase source. Find…

A: A balanced 40 Ohms Y-connected load is connected to a 480V (line voltage), three phase source. To…

Q: 5. It is required to raise the power factor of a 750 kW balanced 3-phase load from 0.70 lagging to…

Q: ww v, 202 152 ww 302 50 mH

Q: What is the main direct cause of reactive power in AC system? A. Resistance of transmission lines B.…

A: The explanation is as follows.

Q: A. A single-phase AC circuit has got a supply voltage of 230 V at a phase angle of 15°, and has an…

A: In this question we will find capacitance required per phase to improve power factor in three phase…

Q: -2. A. A lighting load of 2000 kW and a mo pplied by two alternators running in parallel E. lagging.…

Q: Three Impedances each of (12- j16)N are connected in mesh across a three-phase 410V ac supply.…

A: we need to determine phase current line current real power reactive power

Q: Identify the source and load sides of a three-phase three-wire transmission system by a, b, c, and…

A: The reading of a wattmeter P is given by P = VI cos ϕ where V and I are the RMS values of voltage…

Q: Three Impedances each of (12 -j18)N are connected in mesh across a three-phase 420V ac supply.…

A: According to the given question, it is required to determine the below given parameters for the…

Q: Two Alternators working in parallel supply a lighting bulb of 3MW together with induction motor load…

A: In this question, Two alternator are connected in the parallel and supplied to the power two…

Q: 1. With neat diagram, discuss the 3-phase power measurement using three wattmeter method and write…

Q: Write a report on the Star connection for three phase load experiment using the data/results from…

Q: balanced three-phase Delta connected voltage source supplies Delta connected three-phase symmetrical…

A: In the question the source is balanced and connected to balanced load through transmission line. For…

Q: Three identical impedances each having a resistance R and a capacitance C are connected in star…

A: Given, V=400Vf=50HzW1=800WW2=2000W

Q: 4. A single phase load draws a current of 30 / 35 deg A. The voltage across the load is 220/ 75 deg…

Q: In 3 phase 11kVV generator having unity power factor of 100MW load and the sending and receiving end…

A: The diagram for the sending and receiving end is shown below:

Q: (a) A single phase, unity power factor load takes 60 A at 25 kV. Using a base voltage of 65 kV and…

Q: a. The equivalent impedance of the connection b. The phasor and instantaneous current flowing…

A: Series RLC circuit solve as

Q: a)When three inductive loads, each of reactance 9 Ω and resistance 4 Ω are connected in delta which…

A: As you have not mentioned which question has to solve so I am solving only (a). It is given 3 phase…

Q: A 11 KV source is connected to a 12 MVA load with a 0.83 lagging power factor. How much capacitive…

Q: A 3-phase, star-connected alternator has a resistance of 0-5 2/phase and a synchronous reactance of…

A: In this question we need to find a terminal voltage and voltage regulation of alternator for given…

Q: The load to the three phase supply comprises three similar coils connected in Star. The line current…

A: From given kva and kw calculate phase and line voltage and KVAR. Power factor =active power/apparent…

Q: Three Impedances each of (8 - j24)N are connected in mesh across a three-phase 420V ac supply.…

A: Calculate the above parameters

Q: (b) A symmetrical three-wire three-phase supply as shown in Figure Q2(b) is connected to a balanced…

A: “Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…

Q: 9. A three-phase overhead transm potentials across the first and se (i) the line voltage (ii) the…

Q: A 30-Ω resistor, a 15-Ω inductive reactance, and a 12-Ω capacitive reactance are connected in…

Q: 12.57 Determine the line currents of the three-phase circuit in the figure. /-120°, V. = 110/120° V.…

A: The solution can be achieved as follows.

Q: Find the total real power dissipation in a balanced delta-connected system. Phase voltage is 100V…

A: Given: A balanced delta connected system Phase voltage, Vph=100 V Load impedance, Zph=175 Ω Power…

Q: = 7200 ∠ - 130 ° V VBN = 7200∠110 ° V? Also, find VCN

A: The sequence components are equal in magnitude and displaced by 120 degree. The angle between the…

Q: Q1 (a) A 3 phase industrial load can be represented by a balanced star connected load (ZRN etc) of…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a…

Q: A 200 V single phase circuit has an apparent power of 5 KVA and reactive power of 4 KVAr. Then find…

Q: 3. The power factor of each phase of a balanced wye-connected 5-ohm impedance is 0.6 lagging. This…

Q: QUA power plant has to meet the following load demand: Load A: 100 MW from 8 AM - 6 PM Load B: 150…

Q: 5 Assume a Thévenin equivalent source composed of V, in series with Ze (a) Prove that maximum…

Q: 4. A single phase load draws a current of 30 / 35 deg A. The voltage across the load is 220 / 75 deg…

Q: A single phase circuit is supplying the two loads, Load1 draws a real power of 350 kW at a unity…

A: Given: A single-phase circuit is supplying the two loads, Load 1 draws a real power of 350 kW at a…

Q: Two Alternators working in parallel supply a water pump motor of 100KW with a power factor of 0.6…

A: In this question, We need to determine the KVA and power factor of the load if two loads are…

Q: Determine the complex power for the following give values and specify whether the power factor is…

Q: A naval in-board synchronous generator has anapparent power of 50 kVA and supplies a…

A: To calculate the active power and reactive power of the synchronous generators. For power factor…

Q: A single phase circuit is supplying the two loads, Load1 draws a real power of 350 kW at a unity…

A: Solution: For load 1: P=350 kWCosϕ=1Apparant power:S=PCosϕ=3501S=350 kVA

Q: Determine the nominal impedance per phase of a three-phase alternator, wye connected load, 12KV and…

Q: A 3-phase identical load is connected in delta and consist of a resistance of 160 and an inductance…

A: Phase current=phase voltagephase impedance. line current =3×Phase current. Active power=3*I2*R.…

Q: Two parallel loads are connected to a 120 volt rms, 60 Hz power line. One load absorbs 10 k watts at…

A: Given data, The value of power P1 = 10 kW at 0.8 pf. The value of power P2 = 4 kW at 0.9 pf. The…

Q: Consider a 10 kVA, 200/400 V, 50 HZ: single-phase tranformer has the folloving test results: 0.C.…

Concept explainers

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.

Question

12. A certain load takes 300 kW at 400 V. A three phase capacitor bank rated 15 kVA per phase is connected
in parallel with the load to raise the power factor of the system to 90% lagging. What is the power factor of
the load before correction?
c. 92%
d. 88%
a. 99%
b. 95%
13. A 132 kV line three phase system delivers 70.7 MVA on a balanced delta connected load of a power factor
70.7% lagging. Determine the reactance necessary to attain unity power factor.
a. 1 092 ohms
c. 1142 ohms
d. 1 045 ohms
b. 965 ohms
14. A 150 kVA transformer bank will serve a load expected to draw 135 kW at 0.80 lagging power factor.
Solve for the size of the capacitor bank needed to be added in order to prevent overloading of the
transformer bank.
a 40.391 KVAR
d. 28.266 KVAR
a. 32.506 KVAR
b. 35.866 KVAR

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.

Similar questions

Two three-phase generators supply a three-phase load through separate three-phase lines. The load absorbs 30 kW at 0.8 power factor lagging. The line impedance is (1.4+j1.6) per phase between generator G1 and the load, and (0.8+j1) per phase between generator G2 and the load. If generator G1 supplies 15 kW at 0.8 poir factor lagging, with a terminal voltage of 460 V line-to-line, determine (a) the voltage at the load terminals. (b) the voltage at the terminals of generator G2, and (c) the real and reactive power supplied by generator G2. Assume balanced operation.
Two balanced three-phase loads that are connected in parallel are fed by a three-phase line having a series impedance of (0.4j2.7) per phase. One of the loads absorbs 560 kVA at 0.707 power factor lagging, and the other 132 kW at unity power factor. The line-to-line voltage at the load end of the line is 2203V. Compute (a) the line-to-line voltage at the source end of the line. (b) the total real and reactive power losses in the three-phase line, and (c) the total three-phase real and reactive power supplied at the sending end of the line. Check that the total three-phase complex power delivered by the source equals the total three-phase comp lex power absorbed by the line and loads.
Consider a three-phase Y-connected source feeding a balanced- load. The phasor sum of the line currents as well as the neutral current are always zero. (a) True (b) False
A single-phase source is applied to a two-terminal, passive circuit with equivalent impedance Z=3.045, measured from the terminals. The source current is i(t)=22cos(t)kA. Determine the (a) instantaneous power, (b) real power, (c) reactive power delivered by the source, and (d) source power factor.
A three-phase line with an impedance of (0.2+j1.0)/ phase feeds three balanced three-phase loads connected in parallel. Load 1: Absorbs a total of 150 kW and 120 kvar. Load 2: Delta connected with an impedance of (150j48)/phase. Load 3: 120 kVA at 0.6 PF leading. If the line-to-neutral voltage at the load end of the line is 2000 v (rms), determine the magnitude of the line-to-line voltage at the source end of the line.
Figure 3.32 shows the oneline diagram of a three-phase power system. By selecting a common base of 100 MVA and 22 kV on the generator side, draw an impedance diagram showing all impedances including the load impedance in per-unit. The data are given a follows: G:90MVA22kVx=0.18perunitT1:50MVA22/220kVx=0.10perunitT2:40MVA220/11kVx=0.06perunitT3:40MVA22/110kVx=0.064perunitT4:40MVA110/11kVx=0.08perunitM:66.5MVA10.45kVx=0.185perunit Lines I and 2 have series reactances of 48.4 and 65.43, respectively. At bus 4, the three-phase load absorbs 57 MVA at 10.45 kV and 0.6 power factor lagging.
Consider a 10 kVA, 200/400 V, 50 HZ: single-phase tranformer has the folloving test results:0.C. test: 200 V, 0.6A, 63 W (L.V.side)S.C. test : 20 V, 25A, 85 W (H.V. side)Deternine:i- The eficiengy at 75 % offiull-load at 0.9 leading power factor.ii -The secondary terminal voltage on fill-load at tunity power facton
A balanced delta connected load of 13+j16 ohm per phase is connected at the end of a three-phase line. The line impedance is 2+j11 ohm- per phase. The line is supplied from a three-phase source with a line-to-line voltage of 207.85 Vrms. Taking phase "a" voltage Va as reference, determine the following: (a) Current in phase a. (b) Total complex power supplied from the source. (c) Magnitude of the line-to-line voltage at the load terminal.
A balanced three-phase source with grounded neutral has line-to-neutral voltages of 132.7906 volts with an-bn-cn sequence. This source has an internal series impedance of 0.2+j2.5 ohms per phase. It supplies power to an unbalanced three-phase wye, neutral grounded, load with impedances: Zan = 18-j10; Zbn = 15+j25; Zcn = 20+j30 ohms. If there is a line-to-line fault at lines b and c load-side, what is the magnitude of the fault current in amperes?
A balanced load consists of three coils with each coil having a resistance of 10 Ω and an induction reactance of 15 Ω The load is conneted as star to a 420 V, three-phase, 50 Hz supply as shown in the Figure For abc phase sequence, find (i) the line currents, and (ii) power factor.
Can you please solve the d e f parts? Three symmetrical three-phase loads are connected in parallel. Load 1 is connected in Y with an impedance of 400 + j300Ω / φ, load 2 is connected in with with an impedance of 2400 - j1800Ω / φ and load 3 is evaluated at 172.8 + j2203.2 kVA. Loads are supplied from a distribution line with an impedance of 2 + j16Ω / φ. Size of the voltage between the line and the neutral conductor at the end of the charge the line is 24√3 kV. The operating frequency is 50 Hz.(a) Calculate the line currents and the phase currents of the loads.(b) Calculate the total complex power at the receiving end of the system.(c) Calculate the total complex power at the transmitting end of the line.(d) Calculate the values of the compensation capacitors which are connected from the line to the neuron at the load end of the system so that the power factor at the load end reaches pf ≥ 0.98.(e) What if the capacitors are connected from one line to another? What would be the best…
A balanced three-phase ∆- connected source has a line voltage 120 V. It is connected to a load via a three-wiretransmission line. The per-phase impedance of the ∆-connected load is 30 + j120 Ω. The impedance of each wireof the transmission line is 2 + j4 Ω.How much power is dissipated by the load? How much power is dissipated in transmission line? Power factor of load?