Overvoltages and Insulation Coordination (ETF EEO PKI 4865) |
|
General information |
|
Module title | Overvoltages and Insulation Coordination |
Module code | ETF EEO PKI 4865 |
Study | ETF-B |
Department | Electric Power Engineering |
Year | 1 |
Semester | 2 |
Module type | Mandatory |
ECTS | 6 |
Hours | 65 |
Lectures | 35 |
Exercises | 20 |
Tutorials | 10 |
Module goal - Knowledge and skill to be achieved by students |
|
| Course objective is to introduce the fundamental concepts of high voltage engineering, provide basic knowledge pertaining to specific physical phenomena that occur at high voltages, with special emphasis on the engineering aspect. Insulation coordination, different types of electrical stress (working voltage, lightning and switching over voltages) and the behavior of different insulation systems in action of these stresses, represent the central part of this course. <br> In addition to this, the course will entail demonstration to students of apparatus and testing methodologies that are used in laboratories for reproduction of stresses that occur during operation of high voltage apparatus. <br> |
|
Syllabus |
|
| Overvoltage and insulation coordination: wave equations; classification of voltage stresses: continuous (power-frequency) voltages, temporary overvoltage, slow-front overvoltage, fast-front overvoltages, very fast-front overvoltages and combined overvoltages; conceptual definition of insulation coordination; conventional and statistic insulation coordination; dielectric characteristics of insulation systems; risk of failure. <br> Temporary overvoltages; overvoltages due to earth faults; overvoltages due to load rejection; overvoltages due to resonance and Ferroresonance; longitudinal overvoltages occurring during synchronization; combinations of temporary overvoltage origins; limitations of temporary overvoltages. <br> Slow-front overvoltage (switching overvoltage): overvoltage due to line energization and re-energization; overvoltages due to line faults and fault clearing; overvoltages due to load rejections; overvoltages due to switching of capacitive or inductive currents; overvoltages due to distant lightning strikes to the conductor of overhead lines; limitation of slow-front overvoltage. <br> Fast-front overvoltages (lightning overvoltages); back flashover, direct strikes to the phase conductors, induced over voltages due to lightning strikes to soil close to the line; modeling because of determination of overhead line and substation breakdown characteristics; limitations of fast-front overvoltages; protection of sub-stations from direct strikes. <br> Very fast-front overvoltages: very fast-front overvoltages originate from disconnector operations or faults within AIS (air insulated substations) or GIS (SF6 gas insulated substations); limitations of very fast-front overvoltages. <br> Metal oxide surge arresters: Constructive design of Metal Oxide (MO) surge arresters; classification of MO surge arresters; selection procedure of MO surge arresters; testing procedure of MO surge arresters; System for a real-time check of MO surge arresters' condition. <br> High-voltage testing and measuring <br> |
|
Literature |
|
| Recommended | |
| Additional | |
Didactic methods |
|
| 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). | |
Exams |
|
| 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> |
|
Aditional notes |
|