In a 3-phase balanced star or delta system, the least number of wattmeter essential to measure the powerisO oneO fourO threeO twoThe load connected to a 3-phase supply comprises three similar coils connected in star. The line currents are15 A and the kVA ratings and input power are 15KVA and 8kW respectively.(a) Find the line and phase voltage.(b) If the coils are now connected in delta to the same three-phase supply, calculate the line current and phasecurrent.Chpf1010&8.6.7.A60O O OO

As per Bartleby expert policy, only first one individual question is to be answered, kindly repost…

Answered: In a 3-phase balanced star or delta…

In a 3-phase balanced star or delta system, the least number of wattmeter essential to measure the power is O one O four O three O two

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 2.48P

See similar textbooks

Related questions

Q: A three phase, balanced delta connected resistive load draws 30 ampere phase current from balance…

Q: Q4) Two wattmeters are connected to measure the input power of a balance three phase circuit. The…

A: In this question we need to find a power factor for the given reading of wattmeter.

Q: The two wattmeter method is used to measure the power in a three-phase load. The wattmeter readings…

A: Given The two wattmeter method is used for measure the power of three phase load. The readings of…

Q: The reading of wattmeter and ammeter is 1 kW and 10 A respectively in the three phase circuit given…

A: Given circuit, Reading of Wattmeter and Ammeter is 1 kW and 10 A respectively. P= 1000 W I= 10 A

Q: In the two-wattmeter method of measuring 3-phase power, the wattmeters indicate equal and opposite…

Q: 5. The two-wattmeter method is used to measure the power consumed by a delta connected load. Each…

Q: 4- An out balance three phase star connected load has the following complex Currents i A, I, =le…

A: In this question we will find neutral current...

Q: An over string of 2 insulators has Ce=0.14C. If the string is connected to 3- phase line has a…

A: GivenOver string of 2 insulators hasCe=0.14C3-phase line voltage VL=45 kV

Q: Two wattmeter method is applied to a balanced 3 phase load. Two wattmeter indicate 84.5 KW and 64.7…

A: Given data, Power is given, P1=84.5 KW, P2=64.7 KW

Q: In three phase power measurement, at cos $ =0.5 one of the wattmeter reads zero. Select one: True…

Q: PART A: write TRUE o Dynamometer type wattmeter is a moving iron instrument, which indicates the…

A: Given, We have a statement, and we have to decide whether true or false. Please see below for the…

Q: In two wattmeter method of 3-phase power measurement. One meter reads zero and other meter indicates…

Q: In a 3-phase balanced star connected system, the least number of wattmeter essential to measure the…

A: in balanced system , total power = 3* power in single phase so total power in balanced three phase…

Q: A balanced delta connected load draws 10 A of line current and 3 kW at 220 V. reactance of each…

Q: Q12 Choose correct answer: In 3-phase power measurement using two wattmeter method , if one…

A: Given that In 3-phase power measurement using two wattmeter method , if one wattmeter reads 3.5…

Q: Three similar coils, each having a resistance of 8 2 and an inductive reactance of 8 Q, are…

Q: In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter is zero.…

A: Given: Two wattmeter method has, First Wattmeter reading, W1=W Second wattmeter reading, W2=0

Q: Two watt meters are used to measure the power in a three-phase balanced system. when both the A1…

Q: In two-wattmeter method, the readings of the wattmeter will be identica load in one of the two…

A: Option - b ( Answer )

Q: 7 The two wattmeter method is used to measure power in a three phase load. The wattmeter readings…

Q: The two wattmeter method is used to measure the power in a three-phase load. The wattmeter readings…

A: Given- Three phase load-Wattmeter readings=400W & (-35) WTo Find-The total active power Pactive

Q: Q9. To represent the balanced single phase power systems, the systems should be connected in O delta…

A: Given that to represent the balance single phase power system the system should be connected in…

Q: What size 60 degree Celsius conductors are required for a 9000 watt single-phase 120/240 volt…

A: W=V*I 9000= 240* I I= 9000/240 I= 37.5 amp

Q: Three loads each having a resistance of 82 and capacitive reactance of 82 is connected in delta…

Q: The minimum number of wattmeter (s) required to measure 3-phase, 3-wire balanced or unbalanced power…

Q: In two wattmeter method of 3-phase power measurement, one meter indicates negative reading when the…

Q: In two wattmeter method of 3-phase power measurement, one meter indicates reading when the phase…

A: In two wattmeter method, Total power is given by, PT = P1 + P2 Where P1 and P2 are powers from each…

Q: Three phase power consumed by a three-phase unbalanced load can be measured by using two watt…

A: Yes three phase power consumed by a three-phase unbalanced load can be measured by using two watt…

Q: In balanced and unbalanced 3-phase power measurement, the minimum number(s) of wattmeter required to…

A: The balanced star means the value of the current in all phases are same

Q: 5. The two-wattmeter method is used to measure the power consumed by a delta connected load. Each…

Q: At what p.f will one of the wattmeter reading be zero in a three-phase system. Please answer this in…

A: In the Two wattmeter method of measuring power in a balanced three-phase circuit,…

Q: 59. What does EL(Load) represent? - a. line voltage of the load b. phase voltage of the alternator…

Q: In Figure 2, arrangement is shown for a voltage supply of 410V. For xyz sequence assume that Vw = V,…

A: The phase sequence is xyz, considering Vxy as reference voltage, Vxy=410∠0° VVyz=410∠-120°…

Q: In a two-wattmeter method of measuring power in a balanced 3 phase circuit the ratio of the Watt…

A: Given, For two wattmeter method the wattmeter reading is 1:2 W1=W.W2=2W.

Q: Three resistances of 20 Q each are connected in star across the 400 V, 3-phase A.C. supply.…

Q: In 3-phase power measurement using two wattmeter method, if one wattmeter reads 3.5 times the other,…

Q: In 3 phase star connected system, the potential between any line and neutral is called O ine voltage…

A: A star connection is one in which each winding has one end connected to a common junction and the…

Q: In 3 phase star connected system, the potential between any line and neutral is called zero voltage…

A: In 3 phase star connected system, the potential between any line of the three-phase transformer is…

Q: In 3-phase system, the power consumed by star connected load is _times less than delta connected…

Q: Q9. To represent the balanced single phase power systems, the systems should be connected in Why…

A: We have to find to represent the balance single phase power system the system should be connected in…

Q: A single phase two wire a.c. Find the percentage saving in feeder copper if the system voltage is…

Q: Match the following Each load will be connected between two phase wires Choose... Power measured by…

A: Given, Match the following Each load will be connected between two phase wires Power measured by…

Q: A balanced 3 phase star connected load draws power from a 400 V supply. Two wattmeter's indicate…

A: Given Data:W1 = 8800 WW2 = 3200 WVL = 400 V

Q: In a balanced three phase delta connected system, the volt meter which is connected between Y phase…

A: - According to the given data the circuit diagram for balanced 3 phase Delta connected system is…

Q: In a industry, a balanced 3 phase star connected load draws power from a 420 V supply. wattmeter's…

Q: 3. Two wattmeters measure the total power in three-phase circuits and are correctly connected. One…

A: From given data of question 3 first watt meter reading =4800 watt second watt meter = 400 watt (on…

Q: In two wattmeter method of 3-phase power measurement, both meter reads positive when the phase angle…

A: Given, 3-phase power is measured by two wattmeter method. Reading of both wattmeters are positive.…

Concept explainers

Fault Analysis

In an electrical engineering system, a fault is an abnormal electric current flowing through the system, and fault analysis is the study of these faults. For instance, a short-circuit is a fault where the live wire touches the ground or neutral wire. If a circuit is interrupted by a failure of a current-carrying wire then an open circuit fault occurs. The open-circuit faults are also called series faults. One or more phases or ground may be involved in a three-phase fault or may occur only between two phases. Current flows into the earth in case of a ground fault or earth fault. For most situations, the prospective short circuit current of a fault that is predictable can be calculated. To limit the loss of service because of a failure, the protective devices can detect fault conditions and operate circuit breakers and also other devices. All phases equally can be affected in a poly-phase system which is known as symmetric electrical fault. The asymmetric fault becomes more complicated to analyze if only some phases are affected. By using methods such as symmetrical components, the power system analysis of these types of faults is often simplified. The main objective of power system protection is to design, detect, and interrupt power system faults.

Question

In a 3-phase balanced star or delta system, the least number of wattmeter essential to measure the power
is
O one
O four
O three
O two
The load connected to a 3-phase supply comprises three similar coils connected in star. The line currents are
15 A and the kVA ratings and input power are 15KVA and 8kW respectively.
(a) Find the line and phase voltage.
(b) If the coils are now connected in delta to the same three-phase supply, calculate the line current and phase
current.
Chp
f10
10
&
8.
6.
7.
A
60
O O OO

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

1. A balanced, three-phase, 900V system is supplying a balanced load connected in delta. A three-phase wattmeter (measuring total three-phase power) is connected to the supply and an ammeter is connected to one of the supply phases. Each load consists of a resistance in parallel with an inductive reactance. a. If the wattmeter reads 14.1 kW, what is the resistance of each load? b. If the ammeter reads 10 A What is the impedance (Z) of each load? c. What is the reactance (X)? d. If this load was instead connected in star, what would the new readings be? (P and I).( need only handwritten solution .otherwise downvote.)
The balanced three-phase load shown is fed from a balanced, positive-sequence, three-phase Y-connected source. The impedance of the line connecting the source to the load is negligible. The line-to-neutral voltage of the source is 7200 V. 1. a) Find the reading of the wattmeter in watts. 2. b) Explain how you would connect a second wattmeter in the circuit so that the two wattmeters would measure the total power. 3. c) Calculate the reading of the second wattmeter. 4. d) Verify that the sum of the two wattmeter readings equals the total average power delivered to the load.
28. The impedances are mesh-connected to a symmetrical three-phase, 40-V, 50, Hz supply of phase sequence RYB. Z1=(5+j10)ohm is connected between lines R and Y Z2=(5+j5)ohm is connected between lines Y and B Z3= (6+j4)ohm is connected between lines 8 and R. Two wattmeters connected to measure input have their current coils in lines R and Y respectively. Calculate the line currents and the wattmeter readings. (195.5 A, 79.4 A, 43.4 A; 39.8 kW, 9.6 kW] Answers.
At what power factor will one of the wattmeter reading be zero in a three-phase system??? KINDLY SOLVE THIS. THANX!!!
The load connected to a 3-phase supply comprises three similar coils connected in star. The line currents are 22 A and the kVA rating and power input are 25 kVA and 12 kW respectively. (a) Find the line and phase voltage. (b) If the coils are now connected in delta to the same three phase supply, calculate the line current and phase current
The power flowing in a three-phase, three-wire balanced load system is measured by the two-wattmeter method. The reading on wattmeter A is 5kW and on wattmeter B is -1kW. If the voltage of the circuit is 440V, 60Hz, what is the value of the capacitor that must be introduced into each other phase to cause the whole power measured to appear on wattmeter A? Assume the capacitor to be Y-connected.
2. A wattmeter reads 5,540 W when the current coil is connected in phase a and the voltage coil is connected between the neutral and phase a of a balanced 3-phase system supplying a balanced load of 30 A at 400 V. What will be the reading of the instrument if the connections to the current coil remain unchanged and the voltage coil is connected between phase b and c? Take a-b-c phase sequence.
The electrical power supply system of a particular country is made of the following. Draw asingle line diagram of the electrical power supply system of the country based on the informationbelow using any computer-aided software.Power supply from an infinite bus bar S connected to bus bar A, through a circuit breakerconnected between isolators and a three-phase delta/star solidly earthed transformer T1.Powersupply source from a generator G1 connected to bus bar B through a circuit breaker connectedbetween isolators, and a three- phase delta/star solidly earthed transformer T2. power supplysources from two generators G2 and G3. Each of the generators are connected to a reactor.Furthermore, each of the generators connected to a common bus bar C through a circuit breakerconnected between isolators and a three-phase star/star solidly earthed transformer T3 and T4respectively. bus bar F to bus bar A by means of two isolators, one at each end of transmissionline L6; bus bar A to bus bar E by…
Two balanced Y-connected loads in parallel, one drawing 15 kW at 0.6 power factor lagging andthe other drawing 10 kVA at 0.8 power factor leading, are supplied by a balanced, three-phase,480-volt source.a. Draw the power triangle for each load and for the combined load.b. Determine the power factor of the combined load and state whether lagging or leading.c. Determine the magnitude of the line current from the source.
A single wattmeter is connected to measure reactive power of a three-phase, three-wire balanced load. The line current is 17 A and the line voltage is 440 V. Calculate the power factor of the load if the reading of the wattmeter is 4488 VAR.
At the supply side, the line current was measured as 25A and lags the corresponding line-to-neutral voltage by 30 deg. Shown VL is between lines A and B. 1. What is the total real power in kW delivered by the supply? 2. What is the per-phase impedance in ohms, of the unknown delta connected balanced load? 3. If a wattmeter is connected at the source side: Voltage probe measures VAB, and current problem Measures IAa, what will be the wattmeter reading in watts?
Three identical impedances of 15Ð60°W are connected in star to a three-phase, three-wire, 240 volt system. The lines between the supply and the load have impedances of 2 + j ohms. Find the voltage magnitude at the load.