NSCET QUESTION BANK DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING Nadar Saraswathi College of Engineering and Technology, Vadapudupatti, Theni - 625 531 (Approved by AICTE, New Delhi and Affiliated to Anna University, Chennai) Format No. Rev. No. Date Total Pages NAC/TLP- 07a.12 01 14-11-2017 01 Question Bank for the Units – I to V SEM - VIth Semester – B.E. / B.Tech. BR - Department of Electrical & Electronics Engineering EE8006 –Power Quality Part-A (10 x 2 = 20 Marks) UNIT – I No 1. 1 1. 2 1. 3 1. 4 1. 5 1.6 W h a t d o you mean by voltage sag and voltage swell? List the ma jo r po we r qu al
Transcript
NSCET QUESTION BANK
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
Nadar Saraswathi College of Engineering and Technology,
Vadapudupatti, Theni - 625 531
(Approved by AICTE, New Delhi and Affiliated to Anna University, Chennai)
Format No.
Rev. No.
Date
Total Pages
NAC/TLP- 07a.12
01
14-11-2017
01
Question Bank for the Units – I to V
SEM- VIth Semester – B.E. / B.Tech.
BR- Department of Electrical & Electronics Engineering
EE8006 –Power Quality
Part-A (10 x 2 = 20 Marks)
UNIT – I
No
1.1
1.2
1.3
1.4
1.5
1.6
Question
What do you mean by voltage sag and voltage swell?
List the major power quality issue.
Define power frequency variation.
Define the power quality as per IEEE
What are the main components of power quality standards?
Comment” harmonics affect the electrical system”
Level
L2
L1
L1
L1
L2
L6
Competence
Comprehend
Knowledge
Knowledge
Knowledge
Comprehend
Synthesis
Mark
2
2
2
2
2
21.7 Differentiate inter harmonic and sub harmonics L4 Analysis 2
2.1
2.2Plot the CBEMA curve L2
What are the reasons for voltage imbalance L2
Comprehend 2
Comprehend 2
2.3
2.4
Comment transients or noise on the power line causing problems now
List out the need of power quality standards
L6 Synthesis 2
L1 Knowledge 2
NSCET QUESTION BANK
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
2.5
2.6
2.7
3.1
3.2
3.3
3.4
How are the power quality problems detected?
Illustrate about notching in power quality
Criticize “capacitor switching leads to overvoltage”
When sag leads to interruption
List out the causes of sag
List out the three levels of possible solutions to voltage sag and momentary interruption problems
List some industry standards associated with voltage sags
L2 Comprehend 2
L2 Comprehend 2
L5 Evaluation 2
L2 Comprehend 2
L 1 Knowledge 2
L 1 Knowledge 2
L 1 Knowledge 2
3.5
3.6
3.7
4.1
4.2
4.3
How to estimate voltage sag performance
Demonstrate the causes for voltage sags due to transformer energizing
Define active series compensator
Name the sources of sags and interruption
What are the sources of short interruption?
Describe the importance of voltage sag estimation
L2 Comprehend 2
L3 Application 2
L 1 Knowledge 2
L3 Application 2
L2 Comprehend 2
L2 Comprehend 2
4.4
4.5
4.6
Design the active low pass filter to mitigate the voltage swell L6
Summarize the main function of DSTATCOM L2
Explain static transfer switch L2
Synthesis 2
Comprehend 2
Comprehend 2
4.7What are the main functions of DVR? L2 Comprehend 2
5.1
5.2
What is transient overvoltage?
Define the term Ferro resonance.
L2 Comprehend 2
L1 Knowledge 2
5.3 Define lightning phenomena L 1 Knowledge 2
5.4 What is the significance of EMTP studies? L2 Comprehend 2
NSCET QUESTION BANK
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
5.5
5.6
5.7
6.1
6.2
6.3
6.4
6.5
Write the need for power conditioners
List the sources of over voltage
Demonstrate the working principle of surge arrestor?
When does Ferro resonance occur in a power system?
Summarize the devices used for protection of over voltages?
Show the various causes of over voltages?
Analyze how does lightning cause over voltages?
Compare the difference between Transient Voltage Surge Suppressors (TVSS) and surge arrestors.
L3 Application 2
L1 Knowledge 2
L3 Application 2
L2 Comprehend 2
L2 Comprehend 2
L3 Application 2
L4 Analysis 2
L5 Evaluation 2
6.6
6.7What is the need for low-pass filter in transient protection?
Predict the functions of line arrestors
L2 Comprehend 2
L3 Application 2
7.1
7.2
State the difference between harmonics and transients L1 Knowledge 2
Define point of common coupling (PCC). L1 Knowledge 2
7.3
7.4
7.5
7.6
7.7
8.1
8.2
Mention the harmonic effects on devices and loads.
Analyse the objectives of IEEE and IEC standards?
Why even harmonics are normally absent in the power Converters?
Define harmonics.
Interpret about Total Demand Distortion (TDD)?
What are the sources of harmonic distortion?
Define Total harmonic distortion
L2 Comprehend 2
L4 Analysis 2
L2 Comprehend 2
L1 Knowledge 2
L5 Evaluation 2
L2 Comprehend 2
L1 Knowledge 2
8.3
8.4Write the need of locating harmonic sources
Infer voltage and current distortion?
L3 Application 2
L2 Comprehend 2
NSCET QUESTION BANK
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
8.5 Distinguish between active filter and passive filter. L2 Comprehend 2
8.6 Prepare the IEEE standard for harmonic level in distribution system. L3 Application 2
8.7 Differentiate between linear loads and nonlinear loads L4 Analysis 2
9.1 What is the role of expert system in power quality studies L2 Comprehend 2
9.2 Define power quality monitoring L1 Knowledge 2
9.3 Interpret the merits of modelling and simulation? L5 Evaluation 2
9.4 What is the need for power quality monitoring? L2 Comprehend 2
9.5 What is flicker meter? L2 Comprehend 2
9.6Describe about signal processing tools for analysing powerquality issues L2 Comprehend 2
9.7 List out the various power quality monitoring steps L1 Knowledge 2
10.1 List some of the major power quality monitoring equipment’s. L1 Knowledge 2
10.2 What is spectrum analyser? L2 Comprehend 2
10.3 Name the factors of selecting the instrument for power quality monitoring
L2 Comprehend 2
10.4 Infer the power quality disturbance analyser. L2 Comprehend 2
10.5 List the difference between offline and online power quality data assessment L1 Knowledge 2
10.6 What is meant by proactive monitoring L2
L2
Comprehend 2
10.7 Write any two IEEE standards to assess the power quality monitoring
Comprehend 2
Part – B ( 5 x 16 = 80 Marks) or Part – B ( 5 x 13 = 65 Marks)
UNIT- I
11.a-1 Discuss about any four power quality issues, indicating more Attention in power system.
L3 Application (13)
NSCET QUESTION BANK
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
11.a-2
(i) Discuss the following characteristics of power quality issue(a) Short duration variations(b) Long duration variations
(ii)Discuss in detail about transients
L3Application
L3 Application
(7+6)
11.a-3
(i) Describe the CBEMA and ITI curve
(ii)Define waveform distortion and explain the waveform distortion categories
L2 Comprehension
L2 Comprehension (7+6)
11.a-4
11.b-1
11.b-2
Write short notes on following power quality issues(i) Harmonics L4(ii) Power frequency variations
Discuss the source and effects of different categories of long L3 duration voltage variations that affect the power quality
(i) Summarize the impact of poor power quality on utility and L2 consumers
(ii) Discriminate on over voltage and under voltage in power quality issue L4
Analysis
Application
Comprehension
Analysis
(13)
(13)
(7+6)
11.b-3
11.b-4
(i) Demonstrate the major reasons for the growing concernabout the quality of electric power by both electric utilities and end users
(ii) Illustrate the principle phenomenon causing electric magnetic disturbance classified by International Electro technical commission
(i)Discuss about the Computer Business Equipment Manufactures Associations (CBEMA) curve. Explain the events described in the curve.
ii)Differentiate between power quality, voltage quality and current quality
ApplicationL3
L2 Comprehension
L2Comprehension
L4 Analysis
(7+6)
(7+6)
12.a-1
UNIT – II
(i) Explain the sources of sags in power system L3 Application (7+6)
NSCET QUESTION BANK
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
(ii) Discuss the sources of interruption to affect the power quality
L3 Application
12.a-2
(i) Explain various indexes used to estimate voltage sag
(ii) Discuss some of the solutions for voltage sag and interruption
L2
L3
Comprehension
Application(7+6)
12.a-3Explain the causes of long interruptions and the principle of regulating the voltage
L2 Comprehension (13)
12.a-4 Analysis and calculation of power quality due to various faulted condition
L4 Analysis (13)
12.b-1Explain the operation of Distribution Static Compensator(DSTATCOM) used for sag mitigation
L2 Comprehension (13)
12.b-2
(i) Explain active series compensator to compensate the voltage sag occurs in power system
(ii) Explain how ferro resonance transformer to improve the voltage sag performance
L2
L2
Comprehension
Comprehension
(7+6)
12.b-3 Explain the role of compensators in mitigation of voltage sags.
L2 Comprehension (13)
12.b-4
(i) Explain the solid state transfer switch with transferoperation
(ii)Explain fast transfer switch with transfer operation
L2
L2
Comprehension
Comprehension
(7+6)
UNIT – III
13.a-1 What are the types and causes of transients? Explain the principle of over voltage protection.
L2 Comprehension (13)
13.a-2Write short notes on the following:
(i)Low pass filters (ii)Power conditioner
L3 Application (13)
13.a-3
(i) Explain the problems associated with Ferro resonance.
(ii)What are the different sources of transient over voltages? Discuss the capacitor switching transient.
L2
L2
Comprehension
Comprehension(7+6)
13.a-4 (i) Explain the underground cable system protection.(ii) Explain in detail about the protection of transformer
L2 L2
Comprehension Comprehension
(7+6)
NSCET QUESTION BANK
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
13.b-1
13.b-2
13.b-3
13.b-4
14.a-1
14.a-2
14.a-3
14.a-4
14.b-1
14.b-2
14.b-3
Write short notes on the following(i) Lightning arrestor L5
(ii) Line arrestor
Illustrate the phenomena of impulsive transients and L3 oscillatory transients
Describe the sources of transient over voltages in high, L2 medium and low frequency range.
(i) Define lightning. Discuss in detail about the over L3 voltages due to lightning and the problems associated withit.
(ii)What are the advantages of computer analysis tools? L3 Generalize about PSCAD and EMTP for transient studies?
UNIT –IV
Explain the methods to evaluate harmonic distortion and L2 devices to control.
(i)Explain the IEEE and IEC standards on harmonics distortion. L2
(ii) What are the filters in harmonic analysis? ExplainL2
active and passive filters
(i) Explain briefly how the phenomena of current L4 distortion affects the voltage distortion under the presenceof harmonics
(ii) Explain briefly about locating harmonic sources and L4 characterization in power system
Explain briefly about the sources of harmonics generation L2 and waveform distortion.
Discuss the effects of harmonics on electrical power L4 components
(i) Write short notes on THD and TDD. L2
(ii)Discuss the effects of harmonic distortion on L3 transformers and motors
(i) Demonstrate about evaluation of harmonic distortionL3
(ii) Define the following terms related with IEEE
Evaluation
Application
Comprehension
Application
Application
Comprehension
Comprehension
Comprehension
Analysis
Analysis
Comprehension
Analysis
Comprehension
Application
Application
(13)
(13)
(13)
(7+6)
(13)
(7+6)
(7+6)
(13)
(13)
(3+10)
(7+6)
NSCET QUESTION BANK
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
14.b-4
standards.a) SCRb) Total harmonic distortion.
(i) What is meant by point of common coupling? Generalize the IEEE 519 standard and IEC 61000-3-2 standard with respect to harmonics.
(ii)Design the detail operation of shunt active filter.
L4 Analysis
L2 Comprehension
L6Synthesis
(7+6)
15.a-1
15.a-2
15.a-3
15.a-4
15.b-1
UNIT V
Explain different types of monitoring and diagnostic techniques for various power quality problems.
Explain the flicker meter and flicker measurement techniques in details.
Explain in detail with necessary diagram the working principle and functioning of power quality analysers
Briefly discuss the common objectives of power quality Monitoring.
Design the block diagram of advanced power quality monitoring systems. Explain it in detail
(i) Analyse the role and application of expert systems in
L2 Comprehension (13)
L2 Comprehension (13)
L2 Comprehension (13)
L2 Comprehension (13)
L5 Evaluation (13)
L4
15.b-2power quality monitoring
(ii) Discuss briefly about the different features of harmonicL2
analyser
Analysis
Comprehension(7+6)
15.b-3
15.b-4
Describe the modelling of power quality problems by Mathematical solution tools.
Illustrate the importance of power line analyzer.
L2 Comprehension
L2 Comprehension
(13)
(13)
Part – C ( 1 x 15 = 15 Marks)
U NIT-1
16 .a-1Draw the CBEMA Curve and explain the significance of the term used in it.
L3 Application (15)
NSCET QUESTION BANK
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
16 .a-2Discuss in detail about transients and waveform distortion L3 related to the power quality
Application (15)
16.b-1
(OR)
Explain briefly about international standard of power quality L2 Comprehension (15)
Explain the various types of power quality disturbances in16.b-2 power system and also explain the characteristics of each L2
disturbanceComprehension (15)
U NIT-2
16 .a-1
16 .a-2
Describe the procedure for estimating motor switchingvoltage sag.
L2
Discuss the effects of voltage sag and interruption on various L3 electrical equipment
Comprehension
Application
(15)
(15)
16.b-1
16.b-2
(OR)
What are the different voltage sag mitigation sag L2 Comprehension techniques? Explain in detail
Briefly explain static transfer switches and fast transfer L2 Comprehension switches.
(15)
(15)
U NIT-3
16 .a-1 What are the various lightning protection scheme used for over voltage protection under the presence of harmonics L2 Comprehension (15)
16 .a-2 Briefly explain about shielding and surge arrestor L3 Application (15)
16.b-1
16.b-2
(OR)
Explain in detail over voltages produced due to Ferro resonance
Explain in detail about various methods to mitigate voltage swells
L3 Application (15)
L2 Comprehension (15)
U NIT-4
16 .a-1
16 .a-2
What are the devices used for controlling harmonic distortion L2 and explain their function
Explain briefly about harmonic distortion and conduct an L2 evaluation of study
Comprehension
Comprehension
(15)
(15)
NSCET QUESTION BANK
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
16.b-1
16.b-2
(OR)
Explain briefly about the phenomena of how current distortion affects the voltage distortion under the presence of harmonics
Explain the function of active filters and how it overcomes the drawbacks of passive filter in controlling harmonic
L2 Comprehension (15)
L3 Application (15)
U NIT-5
16 .a-1 Explain monitoring requirement of different types of power quality variation L2 Comprehension (15)
16 .a-2 Discuss the standard measuring instruments used for power Quality survey. L2 Comprehension (15)
16.b-1
(OR)
Explain the steps involved in power quality monitoring. Whatare the information from monitoring site survey?
L2 Comprehension (15)
16.b-2 Illustrate the features of power quality monitoring and Assessment.
