Electric Circuits II Power Measurement. Dr. Firas Obeidat
|
|
- Egbert Newton
- 5 years ago
- Views:
Transcription
1 Electric Circuits II Power Measurement Dr. Firas Obeidat 1
2 Table of contents 1 Single-Phase Power Measurement 2 Three-Phase Power Measurement 2
3 Single-Phase Power Measurement The wattmeter is the instrument used for measuring the average power. The varmeter is the instrument used for measuring the reactive power. The wattmeter consists essentially of two coils: the current coil and the voltage coil. A current coil with very low impedance (ideally zero) is connected in series with the load and responds to the load current. The voltage coil with very high impedance (ideally infinite) is connected in parallel with the load and responds to the load voltage. The current coil acts like a short circuit because of its low impedance; the voltage coil behaves like an open circuit because of its high impedance. When the two coils are energized, the mechanical inertia of the moving system produces a deflection angle that is proportional to the average value of the product v(t)i(t). 3
4 Single-Phase Power Measurement if v t = V m cos (ωt + θ v ) and i t = I m cos (ωt + θ i ) then V rms = V rms θ v = V m 2 θ v and I rms = I rms θ i = I m 2 θ i The wattmeter measures the average power given by P = V rms I rms cos θ v θ i = V rms I rms cos θ v θ i Example: Find the wattmeter reading of the circuit The wattmeter reads the average power absorbed by the impedance (8-j6) because the current coil is in series with the impedance while the voltage coil is in parallel with it. The current through the circuit is 4
5 Single-Phase Power Measurement The voltage across the impedance (8-j6) is The complex power is The wattmeter reads Q: For the circuit, find the wattmeter reading. Answer: kw 5
6 A single wattmeter can also measure the average power in a three-phase system that is balanced, so that P 1 =P 2 =P 3 ; the total power is three times the reading of that one wattmeter. Two or three single-phase wattmeters are necessary to measure power if the system is unbalanced. The three wattmeter method of power measurement will work regardless of whether the load is balanced or unbalanced, wye or delta-connected. The total average power is the algebraic sum of the three wattmeter readings Where P 1,P 2 and P 3 correspond to the readings of wattmeters W 1,W 2 and W 3 respectively. The common or reference point o is selected arbitrarily. If the load is wye-connected, point o can be connected to the neutral point n. For a deltaconnected load, point o can be connected to any point. If point o is connected to point b, for example, the voltage coil in wattmeter reads zero and indicating that wattmeter is not necessary. Thus, two wattmeters are sufficient to measure the total power. 6
7 The two-wattmeter method is the most commonly used method for three-phase power measurement. The two wattmeters must be properly connected to any two phases. The current coil of each wattmeter measures the line current, while the respective voltage coil is connected between the line and the third line and measures the line voltage. The algebraic sum of the two wattmeter readings equals the total average power absorbed by the load, regardless of whether it is wye- or deltaconnected, balanced or unbalanced. The total real power is equal to the algebraic sum of the two wattmeter readings, For a balanced three-phase system wye-connected load Assume the source is in the abc sequence and the load impedance Z Y =Z Y θ. Due to the load impedance, each voltage coil leads its current coil by θ, so that the power factor is cosθ. each line voltage leads the corresponding phase voltage by 30 o. Thus, the total phase difference between the phase current I a and line voltage V ab is θ+30 o and the average power read by wattmeter is 7
8 Use the trigonometric identities The sum of the wattmeter readings gives the total average power The difference of the wattmeter readings is proportional to the total reactive power, or 8
9 The total apparent power can be obtained as The tangent of the power factor is given by The equations derived for balanced wye-connected load are equally valid for a balanced delta-connected load. The two-wattmeter method cannot be used for power measurement in a three-phase four-wire system unless the current through the neutral line is zero. The three-wattmeter method are used to measure the real power in a three-phase four-wire system. 9
10 (a) Example: Three wattmeters W 1,W 2 and W 3 are connected, respectively, to phases a, b, and c to measure the total power absorbed by the unbalanced wye-connected load. The three phase load is connected to balanced voltages of 100 V and the acb sequence. (a) Predict the wattmeter readings. (b) Find the total power absorbed. (b) The total power absorbed is or 10
11 Example: The two-wattmeter method produces wattmeter readings P 1 =1560 W and P 1 =2100 W when connected to a delta-connected load. If the line voltage is 220 V, calculate: (a) the per-phase average power, (b) the perphase reactive power, (c) the power factor, and (d) the phase impedance. (a) The total real or average power is The per-phase average power is then (b) The total reactive power is The per-phase reactive power is 11
12 (c) The power angle is It is a lagging pf because Q T is positive or P 1 >P 2 (d) The phase impedance is Z p =Z p θ, θ is the same as pf angle, so θ=14.33 o For a delta-connected load V L =V p =220 V 12
13 Example: The three-phase balanced load shown in the circuit has impedance per phase of ZY=8+j6 Ω. If the load is connected to 208-V lines, predict the readings of the wattmeters W 1 and W 2. Find P T and Q T. (a) The impedance per phase is The pf angle is o 13
14 14
Three Phase Systems 295
Three Phase Systems 95 9. MEASUEMENT OF POE Star-Connected Balanced Load with Neutral Point Power can be measured in this case by connecting a single wattmeter with its current coil in one line and the
More informationTHREE-PHASE CIRCUITS. Historical Profiles
C H A P T E R THREE-PHASE CIRCUITS 1 2 Society is never prepared to receive any invention. Every new thing is resisted, and it takes years for the inventor to get people to listen to him and years more
More informationThree Phase Circuits
Amin Electronics and Electrical Communications Engineering Department (EECE) Cairo University elc.n102.eng@gmail.com http://scholar.cu.edu.eg/refky/ OUTLINE Previously on ELCN102 Three Phase Circuits Balanced
More informationThree-phase AC Circuits. Measurement of Power in a Three-phase Circuit
Three-phase AC Circuits Lesson Measurement of Power in a Three-phase Circuit In the previous lesson, the phase and line currents for balanced delta-connected load fed from a three-phase supply, along with
More informationLO 1: Three Phase Circuits
Course: EEL 2043 Principles of Electric Machines Class Instructor: Dr. Haris M. Khalid Email: hkhalid@hct.ac.ae Webpage: www.harismkhalid.com LO 1: Three Phase Circuits Three Phase AC System Three phase
More informationUNIT- I Phase Sequence:
UNIT- I Phase Sequence: Phase sequence refers to the relation between voltages (or currents, as well) in a three-phase system. The common representation of this relation is in terms of a phasor diagram,
More informationVTU E-LEARNING NOTES ON:
VTU E-LEARNING NOTES ON: 10EE35 ELECTRICAL AND ELECTRONIC MEASUREMENTS AND INSTRUMENTATION BY DR. M.S. RAVIPRAKASHA PROFESSOR & HEAD DEPT. OF E&E ENGG. MALNAD COLLEGE OF ENGG. HASSAN 573 201. SUBJECT CODE
More informationLecture 11 - AC Power
- AC Power 11/17/2015 Reading: Chapter 11 1 Outline Instantaneous power Complex power Average (real) power Reactive power Apparent power Maximum power transfer Power factor correction 2 Power in AC Circuits
More informationEKT103 ELECTRICAL ENGINEERING
EKT13 EECTRCA ENGNEERNG Chater 1 Three-Phase System 1 COURSE OUTCOME (CO) CO1: Ability to define and exlain the concet of single-hase and threehase system. 2 Revision A sinusoid is a signal that has the
More informationPower and Energy Measurement
Power and Energy Measurement ENE 240 Electrical and Electronic Measurement Class 11, February 4, 2009 werapon.chi@kmutt.ac.th 1 Work, Energy and Power Work is an activity of force and movement in the direction
More informationTHREE PHASE SYSTEMS Part 1
ERT105: ELECTRCAL TECHNOLOGY CHAPTER 3 THREE PHASE SYSTEMS Part 1 1 Objectives Become familiar with the operation of a three phase generator and the magnitude and phase relationship. Be able to calculate
More informationLecture (5) Power Factor,threephase circuits, and Per Unit Calculations
Lecture (5) Power Factor,threephase circuits, and Per Unit Calculations 5-1 Repeating the Example on Power Factor Correction (Given last Class) P? Q? S? Light Motor From source 1000 volts @ 60 Htz 10kW
More informationChapter 5 Steady-State Sinusoidal Analysis
Chapter 5 Steady-State Sinusoidal Analysis Chapter 5 Steady-State Sinusoidal Analysis 1. Identify the frequency, angular frequency, peak value, rms value, and phase of a sinusoidal signal. 2. Solve steady-state
More informationPower and Energy Measurement
Power and Energy Measurement EIE 240 Electrical and Electronic Measurement April 24, 2015 1 Work, Energy and Power Work is an activity of force and movement in the direction of force (Joules) Energy is
More informationChapter 12: Three-Phase Circuits
Chater 1: Three-Phase Circuits 1.1 ntroduction 1. Balanced Three-Phase oltages 1.3 Balanced Wye-Wye connection 1.4 Balanced Wye-Delta Connection 1.7 Power in a Balanced System 1.1 NTRODUCTON A single-hase
More informationPower Factor Improvement
Salman bin AbdulazizUniversity College of Engineering Electrical Engineering Department EE 2050Electrical Circuit Laboratory Power Factor Improvement Experiment # 4 Objectives: 1. To introduce the concept
More informationECE 420. Review of Three Phase Circuits. Copyright by Chanan Singh, Panida Jirutitijaroen, and Hangtian Lei, For educational use only-not for sale.
ECE 40 Review of Three Phase Circuits Outline Phasor Complex power Power factor Balanced 3Ф circuit Read Appendix A Phasors and in steady state are sinusoidal functions with constant frequency 5 0 15 10
More informationLecture 05 Power in AC circuit
CA2627 Building Science Lecture 05 Power in AC circuit Instructor: Jiayu Chen Ph.D. Announcement 1. Makeup Midterm 2. Midterm grade Grade 25 20 15 10 5 0 10 15 20 25 30 35 40 Grade Jiayu Chen, Ph.D. 2
More informationTotal No. of Questions :09] [Total No. of Pages : 03
EE 4 (RR) Total No. of Questions :09] [Total No. of Pages : 03 II/IV B.Tech. DEGREE EXAMINATIONS, APRIL/MAY- 016 Second Semester ELECTRICAL & ELECTRONICS NETWORK ANALYSIS Time: Three Hours Answer Question
More informationTHREE-PHASE CIRCUITS
THR-HAS CIRCUITS 4.1 Introduction Generation, Transmission and distribution of electricity via the National Grid system is accomplished by three-phase alternating currents. The voltage induced by a single
More informationSinusoidal Steady State Analysis (AC Analysis) Part II
Sinusoidal Steady State Analysis (AC Analysis) Part II Amin Electronics and Electrical Communications Engineering Department (EECE) Cairo University elc.n102.eng@gmail.com http://scholar.cu.edu.eg/refky/
More informationINVESTIGATION OF THREE PHASE SYSTEM
EXPEIMENT 4 INVESTIGATION OF THEE PHASE SYSTEM. Purpose of the exercise. a) To be familiar with certain methods of the measurements of the average power in the three phases three and four-wire balanced
More informationLecture 3: Three-phase power circuits
1/24/28 Lecture : Three-phase power circuits 1 nstructor: Dr. Gleb. Tcheslavski Contact: gleb@ee.lamar.edu Office Hours: TBD; Room 2 Class web site: MyLamar ntroduction 2 Almost all electric power generation
More informationENE 104 Electric Circuit Theory
Electric Circuit Theory Lecture 11: : Dejwoot KHAWPARSUTH http://webstaff.kmutt.ac.th/~dejwoot.kha/ Objectives : Ch12 Page 2 single-phase and polyphase systems Y- and Δ- connected three-phase system per-phase
More informationGeneration, transmission and distribution, as well as power supplied to industrial and commercial customers uses a 3 phase system.
Three-phase Circuits Generation, transmission and distribution, as well as power supplied to industrial and commercial customers uses a 3 phase system. Where 3 voltages are supplied of equal magnitude,
More informationWork, Energy and Power
1 Work, Energy and Power Work is an activity of force and movement in the direction of force (Joules) Energy is the capacity for doing work (Joules) Power is the rate of using energy (Watt) P = W / t,
More informationECE 1311: Electric Circuits. Chapter 2: Basic laws
ECE 1311: Electric Circuits Chapter 2: Basic laws Basic Law Overview Ideal sources series and parallel Ohm s law Definitions open circuits, short circuits, conductance, nodes, branches, loops Kirchhoff's
More informationUnit-3. Question Bank
Unit- Question Bank Q.1 A delta connected load draw a current of 15A at lagging P.F. of.85 from 400, -hase, 50Hz suly. Find & of each hase. Given P = = 400 0 I = 15A Ans. 4.98, 5.7mH So I P = 15 =8.66A
More informationCh 8. Three-phase systems
Ch 8. Three-ase systems Lecture outcomes (what you are supposed to learn): Generation of three-ase voltages Connection of three-ase circuits Wye-Delta transformation Power of three-ase connected loads
More informationmywbut.com Lesson 16 Solution of Current in AC Parallel and Seriesparallel
esson 6 Solution of urrent in Parallel and Seriesparallel ircuits n the last lesson, the following points were described:. How to compute the total impedance/admittance in series/parallel circuits?. How
More informationChapter 2-3 Transformers
Principles of Electric Machines and Power Electronics Chapter 2-3 Transformers Third Edition P. C. Sen Auto transformer Per unit system S b = S rate V b1 = V rate1 V b2 = V rate2 S b I b1 = = S rate =
More informationThe Eects of Harmonics in Power Systems and Methods to Reduce or Eliminate Them
The Eects of Harmonics in Power Systems and Methods to Reduce or Eliminate Them Wilbur N. Dale, Ph.D., P.E. wilburd@rstva.com March 15, 2012 Overview Introduction Analysis of Harmonics Sources of Harmonics
More informationNotes on Electric Circuits (Dr. Ramakant Srivastava)
Notes on Electric ircuits (Dr. Ramakant Srivastava) Passive Sign onvention (PS) Passive sign convention deals with the designation of the polarity of the voltage and the direction of the current arrow
More informationSymmetrical Components. References
Symmetrical Components Review of basics Sequence Equivalents Fault Analysis Symmetrical Components Fall 28 References Your power systems analysis class text book NPAG: Chapter 4 (analysis) Chapter 5 (equipment
More information6. Three-Phase Systems. Department of Electrical, Electronic, and Information Engineering (DEI) - University of Bologna
6. Three-Phase Systems J B G Three-Phase Systems v v v i i i The generation and the distribution of electrical energy is usually done by three- phase systems. There are three wire system connected to a
More informationRevised October 6, EEL , Henry Zmuda. 2. Three-Phase Circuits 1
Three Phase Circuitsit Revised October 6, 008. Three-Phase Circuits 1 Preliminary Comments and a quick review of phasors. We live in the time domain. We also assume a causal (nonpredictive) world. Real-world
More informationReview of DC Electric Circuit. DC Electric Circuits Examples (source:
Review of DC Electric Circuit DC Electric Circuits Examples (source: http://hyperphysics.phyastr.gsu.edu/hbase/electric/dcex.html) 1 Review - DC Electric Circuit Multisim Circuit Simulation DC Circuit
More informationPower Systems - Basic Concepts and Applications - Part I
PDHonline Course E104 (1 PDH) Power ystems Basic Concepts and Applications Part I Instructor: hihmin Hsu PhD PE 01 PDH Online PDH Center 57 Meadow Estates Drive Fairfax A 006658 Phone & Fax: 709880088
More informationBasics of Electric Circuits
António Dente Célia de Jesus February 2014 1 Alternating Current Circuits 1.1 Using Phasors There are practical and economic reasons justifying that electrical generators produce emf with alternating and
More informationEE 3120 Electric Energy Systems Study Guide for Prerequisite Test Wednesday, Jan 18, pm, Room TBA
EE 3120 Electric Energy Systems Study Guide for Prerequisite Test Wednesday, Jan 18, 2006 6-7 pm, Room TBA First retrieve your EE2110 final and other course papers and notes! The test will be closed book
More informationECE 421/521 Electric Energy Systems Power Systems Analysis I 2 Basic Principles. Instructor: Kai Sun Fall 2013
ECE 41/51 Electric Energy Systems Power Systems Analysis I Basic Principles Instructor: Kai Sun Fall 013 1 Outline Power in a 1-phase AC circuit Complex power Balanced 3-phase circuit Single Phase AC System
More informationRefresher course on Electrical fundamentals (Basics of A.C. Circuits) by B.M.Vyas
Refresher course on Electrical fundamentals (Basics of A.C. Circuits) by B.M.Vyas A specifically designed programme for Da Afghanistan Breshna Sherkat (DABS) Afghanistan 1 Areas Covered Under this Module
More informationBASIC PRINCIPLES. Power In Single-Phase AC Circuit
BASIC PRINCIPLES Power In Single-Phase AC Circuit Let instantaneous voltage be v(t)=v m cos(ωt+θ v ) Let instantaneous current be i(t)=i m cos(ωt+θ i ) The instantaneous p(t) delivered to the load is p(t)=v(t)i(t)=v
More informationModule 4. Single-phase AC circuits. Version 2 EE IIT, Kharagpur
Module 4 Single-phase circuits ersion EE T, Kharagpur esson 6 Solution of urrent in Parallel and Seriesparallel ircuits ersion EE T, Kharagpur n the last lesson, the following points were described:. How
More informationHours / 100 Marks Seat No.
17322 21314 3 Hours / 100 Seat No. Instructions (1) All Questions are Compulsory. (2) Answer each next main Question on a new page. (3) Illustrate your answers with neat sketches wherever necessary. (4)
More informationElectric Machines I Three Phase Induction Motor. Dr. Firas Obeidat
Electric Machines I Three Phase Induction Motor Dr. Firas Obeidat 1 Table of contents 1 General Principles 2 Construction 3 Production of Rotating Field 4 Why Does the Rotor Rotate 5 The Slip and Rotor
More information11. AC Circuit Power Analysis
. AC Circuit Power Analysis Often an integral part of circuit analysis is the determination of either power delivered or power absorbed (or both). In this chapter First, we begin by considering instantaneous
More informationAC Power Analysis. Chapter Objectives:
AC Power Analysis Chapter Objectives: Know the difference between instantaneous power and average power Learn the AC version of maximum power transfer theorem Learn about the concepts of effective or value
More informationEEE3405 ELECTRICAL ENGINEERING PRINCIPLES 2 - TEST
ATTEMPT ALL QUESTIONS (EACH QUESTION 20 Marks, FULL MAKS = 60) Given v 1 = 100 sin(100πt+π/6) (i) Find the MS, period and the frequency of v 1 (ii) If v 2 =75sin(100πt-π/10) find V 1, V 2, 2V 1 -V 2 (phasor)
More informationAC Circuits Homework Set
Problem 1. In an oscillating LC circuit in which C=4.0 μf, the maximum potential difference across the capacitor during the oscillations is 1.50 V and the maximum current through the inductor is 50.0 ma.
More informationWork, Energy and Power
1 Work, Energy and Power Work is an activity of force and movement in the direction of force (Joules) Energy is the capacity for doing work (Joules) Power is the rate of using energy (Watt) P = W / t,
More informationEE221 - Practice for the Midterm Exam
EE1 - Practice for the Midterm Exam 1. Consider this circuit and corresponding plot of the inductor current: Determine the values of L, R 1 and R : L = H, R 1 = Ω and R = Ω. Hint: Use the plot to determine
More informationFACULTY OF ENGINEERING LAB SHEET
FCLTY F ENGNEERNG LB SHEET EEL1196 nstrumentation & Measurement Techniques TRMESTER 2 2017-2018 M2: Power Measurement sing Two Wattmeter Method *Note: Students will have to tabulate the theoretical values
More informationChapter 1W Basic Electromagnetic Concepts
Chapter 1W Basic Electromagnetic Concepts 1W Basic Electromagnetic Concepts 1W.1 Examples and Problems on Electric Circuits 1W.2 Examples on Magnetic Concepts This chapter includes additional examples
More informationChapter 15 Power And Harmonics in Nonsinusoidal Systems
Chapter 15 Power And Harmonics in Nonsinusoidal Systems 15.1. Average power in terms of Fourier series 15.2. RMS value of a waveform 15.3. Power factor THD Distortion and Displacement factors 15.4. Power
More informationModule 4. Single-phase AC Circuits
Module 4 Single-phase AC Circuits Lesson 14 Solution of Current in R-L-C Series Circuits In the last lesson, two points were described: 1. How to represent a sinusoidal (ac) quantity, i.e. voltage/current
More informationHomework 2 SJTU233. Part A. Part B. Problem 2. Part A. Problem 1. Find the impedance Zab in the circuit seen in the figure. Suppose that R = 5 Ω.
Homework 2 SJTU233 Problem 1 Find the impedance Zab in the circuit seen in the figure. Suppose that R = 5 Ω. Express Zab in polar form. Enter your answer using polar notation. Express argument in degrees.
More informationFault Analysis Power System Representation
.1. Power System Representation Single Line Diagram: Almost all modern power systems are three phase systems with the phases of equal magnitude and equal phase difference (i.e., 10 o ). These three phase
More information= 32.0\cis{38.7} = j Ω. Zab = Homework 2 SJTU233. Part A. Part B. Problem 2. Part A. Problem 1
Homework 2 SJTU233 Problem 1 Find the impedance Zab in the circuit seen in the figure. Suppose that R = 5 Ω. Express Zab in polar form. Enter your answer using polar notation. Express argument in degrees.
More informationConsider Figure What is the horizontal axis grid increment?
Chapter Outline CHAPER 14 hree-phase Circuits and Power 14.1 What Is hree-phase? Why Is hree-phase Used? 14.2 hree-phase Circuits: Configurations, Conversions, Analysis 14.2.1 Delta Configuration Analysis
More informationModule 7. Transformer. Version 2 EE IIT, Kharagpur
Module 7 Transformer ersion EE T, Kharagpur Lesson 5 Testing, Efficiency & Regulation ersion EE T, Kharagpur Contents 5 Testing, Efficiency & regulation 4 5. Goals of the lesson.. 4 5. Determination of
More informationECE 476 Power System Analysis Fall 2014 Exam #1, Thursday, October 2, :30AM - 10:50AM
ECE 476 Power System Analysis Fall 4 Exam #, Thursday, October, 4. 9:3AM - :5AM Name: Problem (5 p) Two balanced 3-phase loads are connected in parallel. One is Y-connected and draws 75 kw (3-phase) at.8
More informationCircuit Theorems Overview Linearity Superposition Source Transformation Thévenin and Norton Equivalents Maximum Power Transfer
Circuit Theorems Overview Linearity Superposition Source Transformation Thévenin and Norton Equivalents Maximum Power Transfer J. McNames Portland State University ECE 221 Circuit Theorems Ver. 1.36 1
More informationTransmission Line Input Impedance
1/22/23 Transmission e Input Impedance.doc 1/9 Transmission e Input Impedance Consider a lossless le, length, termated with a load. I(z) I + V (z) -, β + V - z z What is the put impedance of this le? Q:
More informationBASIC NETWORK ANALYSIS
SECTION 1 BASIC NETWORK ANALYSIS A. Wayne Galli, Ph.D. Project Engineer Newport News Shipbuilding Series-Parallel dc Network Analysis......................... 1.1 Branch-Current Analysis of a dc Network......................
More informationPHASOR DIAGRAMS HANDS-ON RELAY SCHOOL WSU PULLMAN, WA.
PHASOR DIAGRAMS HANDS-ON RELAY SCHOOL WSU PULLMAN, WA. RON ALEXANDER - BPA What are phasors??? In normal practice, the phasor represents the rms maximum value of the positive half cycle of the sinusoid
More informationBasics of Network Theory (Part-I)
Basics of Network Theory (Part-I) 1. One coulomb charge is equal to the charge on (a) 6.24 x 10 18 electrons (b) 6.24 x 10 24 electrons (c) 6.24 x 10 18 atoms (d) none of the above 2. The correct relation
More informationTransformer Fundamentals
Transformer Fundamentals 1 Introduction The physical basis of the transformer is mutual induction between two circuits linked by a common magnetic field. Transformer is required to pass electrical energy
More informationSimple Resistive Circuits
Simple Resistive Circuits Qi Xuan Zhejiang University of Technology September 2015 Electric Circuits 1 Structure Resistors in Series Resistors in Parallel The Voltage/Current- Divider Circuit Voltage/Current
More informationEXP. NO. 3 Power on (resistive inductive & capacitive) load Series connection
OBJECT: To examine the power distribution on (R, L, C) series circuit. APPARATUS 1-signal function generator 2- Oscilloscope, A.V.O meter 3- Resisters & inductor &capacitor THEORY the following form for
More informationREACTANCE. By: Enzo Paterno Date: 03/2013
REACTANCE REACTANCE By: Enzo Paterno Date: 03/2013 5/2007 Enzo Paterno 1 RESISTANCE - R i R (t R A resistor for all practical purposes is unaffected by the frequency of the applied sinusoidal voltage or
More informationB.E. / B.Tech. Degree Examination, April / May 2010 Sixth Semester. Electrical and Electronics Engineering. EE 1352 Power System Analysis
B.E. / B.Tech. Degree Examination, April / May 2010 Sixth Semester Electrical and Electronics Engineering EE 1352 Power System Analysis (Regulation 2008) Time: Three hours Answer all questions Part A (10
More informationPHASOR DIAGRAMS HANDS-ON RELAY SCHOOL WSU PULLMAN, WA. RON ALEXANDER - BPA
PHASOR DIAGRAMS HANDS-ON RELAY SCHOOL WSU PULLMAN, WA. RON ALEXANDER - BPA I m VECTOR. Cause I m committing crimes with magnitude and direction at the same time!" What are phasors??? In normal practice,
More informationSSC-JE EE POWER SYSTEMS: GENERATION, TRANSMISSION & DISTRIBUTION SSC-JE STAFF SELECTION COMMISSION ELECTRICAL ENGINEERING STUDY MATERIAL
1 SSC-JE STAFF SELECTION COMMISSION ELECTRICAL ENGINEERING STUDY MATERIAL Power Systems: Generation, Transmission and Distribution Power Systems: Generation, Transmission and Distribution Power Systems:
More informationPower system conductor volume calculation
Power system conductor volume calculation Dr Audih alfaoury T&D power systems 2017-1018 Electrical Energy Engineering Department Dr Audih alfaoury 1 The transmission of electric power is carried at high
More information10.1 Instantaneous Power 10.2 Average and Reactive Power 10.3 The RMS Value and Power Calculations 10.4 Complex Power
SINUSOIDAL STEADY-STATE STATE POWER CALCULATIONS C.T. Pan 1 10.1 Instantaneous Powe 10. Aveage and Reactive Powe 10.3 The RMS Value and Powe Calculations 10.4 Complex Powe C.T. Pan 10.5 Powe Calculations
More informationANDERSON S BRIDGE & SCHERING S BRIDGE
ANDERSON S BRIDGE & SCHERING S BRIDGE ANDERSON S BRIDGE AIM: A)To measure inductance of a given coil by Anderson s bridge. B) To determine the value of a given capacitor and to obtain for its dissipation
More information8 z 2, then the greatest value of z is. 2. The principal argument/amplitude of the complex number 1 2 i (C) (D) 3 (C)
1. If z is a complex number and if 8 z 2, then the greatest value of z is z (A) 2 (B) 3 (C) 4 (D) 5 4 2. The principal argument/amplitude of the complex number 1 2 i 1 3i is (A) 2 (B) 4 (C) (D) 3 4 3.
More informationEE313 Fall 2013 Exam #1 (100 pts) Thursday, September 26, 2013 Name. 1) [6 pts] Convert the following time-domain circuit to the RMS Phasor Domain.
Name If you have any questions ask them. Remember to include all units on your answers (V, A, etc). Clearly indicate your answers. All angles must be in the range 0 to +180 or 0 to 180 degrees. 1) [6 pts]
More informationTECHNICAL BULLETIN 006 Symmetrical Components Overview. Introduction. I a g I b g I c
Introduction The method of symmetrical components is a mathematical technique that allows the engineer to solve unbalanced systems using balanced techniques. Developed by C. Fortescue and presented in
More informationECE 421/521 Electric Energy Systems Power Systems Analysis I 2 Basic Principles. Instructor: Kai Sun Fall 2014
ECE 41/51 Electric Energy Systems Power Systems Analysis I Basic Princiles Instructor: Kai Sun Fall 014 1 Outline Power in a 1-hase AC circuit Comlex ower Balanced 3-hase circuit Single Phase AC System
More informationEE 212 PASSIVE AC CIRCUITS
EE 212 PASSIVE AC CIRCUITS Condensed Text Prepared by: Rajesh Karki, Ph.D., P.Eng. Dept. of Electrical Engineering University of Saskatchewan About the EE 212 Condensed Text The major topics in the course
More informationAC Electric Machines. Objectives. Introduction. 1. To understand what the meant by the term ac circuit. 2. To understand how to analyze ac circuits.
AC Electric Machines Objectives 1. To understand what the meant by the term ac circuit.. To understand how to analyze ac circuits. 3. To understand the basic construction and operation of an ac machine.
More informationChapter 33. Alternating Current Circuits
Chapter 33 Alternating Current Circuits 1 Capacitor Resistor + Q = C V = I R R I + + Inductance d I Vab = L dt AC power source The AC power source provides an alternative voltage, Notation - Lower case
More informationReview of Basic Electrical and Magnetic Circuit Concepts EE
Review of Basic Electrical and Magnetic Circuit Concepts EE 442-642 Sinusoidal Linear Circuits: Instantaneous voltage, current and power, rms values Average (real) power, reactive power, apparent power,
More information12. Introduction and Chapter Objectives
Real Analog - Circuits 1 Chapter 1: Steady-State Sinusoidal Power 1. Introduction and Chapter Objectives In this chapter we will address the issue of power transmission via sinusoidal or AC) signals. This
More informationPARALLEL A.C. CIRCUITS
C H A P T E R 4 earning Objectives Solving Parallel Circuits Vector or Phasor Method Admittance Method Application of Admittance Method Complex or Phasor Algebra Series-Parallel Circuits Series Equivalent
More informationKINGS COLLEGE OF ENGINEERING Punalkulam
KINGS COLLEGE OF ENGINEERING Punalkulam 613 303 DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING POWER SYSTEM ANALYSIS QUESTION BANK UNIT I THE POWER SYSTEM AN OVERVIEW AND MODELLING PART A (TWO MARK
More informationSinusoidal Steady State Analysis
Sinusoidal Steady State Analysis 9 Assessment Problems AP 9. [a] V = 70/ 40 V [b] 0 sin(000t +20 ) = 0 cos(000t 70 ).. I = 0/ 70 A [c] I =5/36.87 + 0/ 53.3 =4+j3+6 j8 =0 j5 =.8/ 26.57 A [d] sin(20,000πt
More informationSinusoidal Steady State Power Calculations
10 Sinusoidal Steady State Power Calculations Assessment Problems AP 10.1 [a] V = 100/ 45 V, Therefore I = 20/15 A P = 1 (100)(20)cos[ 45 (15)] = 500W, 2 A B Q = 1000sin 60 = 866.03 VAR, B A [b] V = 100/
More informationElectric Circuits I. Nodal Analysis. Dr. Firas Obeidat
Electric Circuits I Nodal Analysis Dr. Firas Obeidat 1 Nodal Analysis Without Voltage Source Nodal analysis, which is based on a systematic application of Kirchhoff s current law (KCL). A node is defined
More informationUniversity of Jordan Faculty of Engineering & Technology Electric Power Engineering Department
University of Jordan Faculty of Engineering & Technology Electric Power Engineering Department EE471: Electrical Machines-II Tutorial # 2: 3-ph Induction Motor/Generator Question #1 A 100 hp, 60-Hz, three-phase
More informationTRANSFORMERS B O O K P G
TRANSFORMERS B O O K P G. 4 4 4-449 REVIEW The RMS equivalent current is defined as the dc that will provide the same power in the resistor as the ac does on average P average = I 2 RMS R = 1 2 I 0 2 R=
More informationExercise Dr.-Ing. Abdalkarim Awad. Informatik 7 Rechnernetze und Kommunikationssysteme
Exercise1 1.10.015 Informatik 7 Rechnernetze und Kommunikationssysteme Review of Phasors Goal of phasor analysis is to simplify the analysis of constant frequency ac systems v(t) = max cos(wt + q v ) i(t)
More informationModule 4. Single-phase AC Circuits. Version 2 EE IIT, Kharagpur 1
Module 4 Single-phase A ircuits ersion EE IIT, Kharagpur esson 4 Solution of urrent in -- Series ircuits ersion EE IIT, Kharagpur In the last lesson, two points were described:. How to represent a sinusoidal
More information2 Signal Frequency and Impedances First Order Filter Circuits Resonant and Second Order Filter Circuits... 13
Lecture Notes: 3454 Physics and Electronics Lecture ( nd Half), Year: 7 Physics Department, Faculty of Science, Chulalongkorn University //7 Contents Power in Ac Circuits Signal Frequency and Impedances
More informationBook Page cgrahamphysics.com Transformers
Book Page 444-449 Transformers Review The RMS equivalent current is defined as the dc that will provide the same power in the resistor as the ac does on average P average = I 2 RMS R = 1 2 I 0 2 R= V RMS
More informationElectrical Machines-I Prof. D. Kastha Department of Electrical Engineering Indian Institute of Technology, Kharagpur
Electrical Machines-I Prof. D. Kastha Department of Electrical Engineering Indian Institute of Technology, Kharagpur Lecture - 20 Potential and Current Transformers (Refer Slide Time: 00:37) So far we
More informationDistribution System Line Models
FAKULTA ELEKTROTECHNIKY A KOMUNIKAČNÍCH TECHNOLOGIÍ VYSOKÉ UČENÍ TECHNICKÉ V BRNĚ Distribution System Line Models Authors: Ing. Mayada Daboul doc. Ing. Jaroslava Orságová, Ph.D. May 2013 epower Inovace
More informationElectrical Circuits Lab Series RC Circuit Phasor Diagram
Electrical Circuits Lab. 0903219 Series RC Circuit Phasor Diagram - Simple steps to draw phasor diagram of a series RC circuit without memorizing: * Start with the quantity (voltage or current) that is
More information