Quality of electricity (ETF EEI KEE 4860) |
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General information |
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Module title | Quality of electricity |
Module code | ETF EEI KEE 4860 |
Study | ETF-B |
Department | Electric Power Engineering |
Year | 1 |
Semester | 2 |
Module type | Elective |
ECTS | 5 |
Hours | 60 |
Lectures | 35 |
Exercises | 15 |
Tutorials | 10 |
Module goal - Knowledge and skill to be achieved by students |
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| The primary goal of this course is to present in a systematic manner - transitional and permanent disturbances which lead to the loss of quality of electricity. For each type of disturbance, there will be given operational definition, causes, problems that it poses for the grid system, systems for compensation, necessary instruments for the measurement, as well as valid regulations. <br> |
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Syllabus |
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| General aspects related to the quality of electricity; costs of breakdown - in general and pertaining to different sectors of industrial production; system performance indexes; economic aspects related to the quality of electricity: the optimal level of investments, contracts between the supplier and consumer; quality of electricity as the service in the electricity market; immunity level and emissions of one electric device which operates in the industrial ambient: deterministic and probabilistic access; transitional and permanent voltage disturbance, classifications of disturbances; regulations: the European standard, IEC, IEEE. <br> Permanent phenomena: harmonics in the electrical - power system; Definition of harmonics; causes and consequence of harmonics appearance - problems related to the harmonic appearance; harmonics propagation in the system: grid models and probabilistic aspects; harmonics compensations: passive and active filters. <br> Transitional phenomena: overvoltages and voltage holes; origin and sources of transitional disturbances; removal techniques of short-circuiting in electric grids and their impact on the availability and quality of electricity; propagation of transitional disturbances through the distributive grid; immunity to transitional disturbances; CBEMA curve; probabilistic analysis of immunity of one device which operates in the given grid; methodologies for achieving immunity of electronic components. <br> Flickers: Flicker definition; voltage fluctuations which lead to flickers; physiological disturbances caused by flickers: subjective sensitivity curve; flicker sources in electric grids: arc blow furnaces, welding devices; dynamic compensation of reactive energy in arc blow furnace as a method for flicker elimination; accepted international standards. <br> Monitoring of quality of electricity; basics of the monitoring system; appliances in the analysis of breakdowns; other advanced appliances; integration problems; Intelligent monitoring systems. <br> |
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Literature |
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Didactic methods |
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| Course lessons are taught by the professor in lecture halls, and followed by demonstration and solving of practical examples and mathematical equations/graphs. Additionally, students spend time on tutorials and lab-exercises. They resolve specific problems pertaining to their theses, using available or student-developed software. Goal of these activities is to enable students to get hands-on, practical experience in this area, as well as to gauge students' knowledge through assigned papers and exams (mid-term, as well as final). <br> |
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Exams |
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| During the course students earn points according to the following system: <br> - Attending classes and tutorials: 10 points; a student with more than three absences from lectures and/or tutorials will not be eligible to get these points. <br> - Home assignments, laboratory reports and/or final thesis: maximum of 10 points. <br> - Mid-term and final exams: a student can score up to 20 points on each exam (passing grade is 10 points). <br> During each of the two exams (time assigned is 90 minutes) students will solve simple questions - designed to examine whether students acquired basic theoretical knowledge - multiple choice problems, as well as one open-answer problem. Students who gain less than 20 points during one semester must re-take that course. <br> Students who earn 40 or more points during the semester are eligible for taking a final exam; the exam asks the student to discuss mathematical problems from the mid-term exam and home assignments, as well as to answer to simple questions related to general course topics. <br> A student can score a maximum of 40 points on the final oral exam (passing threshold is 20 points). A student who gets less than this minimum, must take a makeup oral exam. <br> A student who earns 20 points or more, and less than 40 points during the whole semester will have to take a makeup exam. The makeup exam is organized in the following manner: <br> - Written part is structured similarly to mid-term written exam, during which students will have to solve problems in which they failed on their mid-term exams (got less than 10 points). <br> - Oral part of the exam is structured in the same way as the oral part of the final exam. <br> |
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Aditional notes |
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