Electromagnetic Transients
Description: The discipline forms students' knowledge, skills and abilities in the field of control of electromagnetic transients that occur when the operating modes of electrical equipment of electric power systems and networks, power plants and power supply systems change under normal and emergency operating conditions. The discipline discusses the basics of the formation of criteria and methods for the quantitative and qualitative assessment of currents and voltages during electromagnetic transients, allowing to determine the requirements for the means of protecting equipment from the manifestation of dangerous factors of their influence, to choose means of protection from such influences, to make design decisions that limit the intensity of their manifestation.
Amount of credits: 5
Пререквизиты:
- Theoretical Foundations of Electrical Engineering II
Course Workload:
| Types of classes | hours |
|---|---|
| Lectures | 15 |
| Practical works | 30 |
| Laboratory works | |
| SAWTG (Student Autonomous Work under Teacher Guidance) | 30 |
| SAW (Student autonomous work) | 75 |
| Form of final control | Exam |
| Final assessment method | a written exam |
Component: Component by selection
Cycle: Base disciplines
Goal
- The objectives of mastering the discipline are the formation of systematized knowledge in the field of transient processes both in the energy system as a whole and in its individual elements, the acquisition by students of the skills of their calculation in case of three-phase and asymmetric short circuits, as well as in case of phase breaks, skills in calculating and analyzing transient modes of electrical systems and load nodes, taking into account the operation of automatic regulation and control systems.
Objective
- - development by students of mathematical models of various elements of electric power systems - synchronous generators, asynchronous electric motors, transformers, etc., reflecting the features of transient processes in these elements; - obtaining knowledge in the field of methods for studying transients, practical methods for calculating short-circuit currents; - study of methods and algorithms for calculating currents and voltages in case of asymmetric short circuits and phase breaks, including with the help of software and computer systems; - formation of skills for the calculation of transient processes in electric power systems.
Learning outcome: knowledge and understanding
- Know: the main schemes and diagrams of the auxiliary needs of the power plant, ways to ensure the normal operation of the equipment and the prevention and / or elimination of abnormal and emergency modes
Learning outcome: applying knowledge and understanding
- To be able to: comply with the requirements of regulatory and technical documentation, organize and control the process of performing work by subordinate operational personnel of a shop shift during the operation of turbogenerators, transformers, autotransformers and shunt reactors
Learning outcome: formation of judgments
- Possess: skills with modern control systems, collection of data transmission, continuous monitoring of the state of equipment, parameters of its operation mode and their analysis
Learning outcome: communicative abilities
- be able to work in a team when performing interdisciplinary tasks of the electric power industry using electromagnetic transients
Learning outcome: learning skills or learning abilities
- be ready to master new knowledge and methods for optimizing the modes of electric power systems based on the study of electromagnetic transients
Teaching methods
The methods (technologies) of teaching used in the course of teaching the discipline are indicated. Among the effective pedagogical techniques and technologies that contribute to the involvement of students in the search and management of knowledge, the acquisition of experience in solving various tasks independently, it should be highlighted: - technologies of problem- and project-oriented learning; - technologies of educational and research activities; - communication technologies (discussion, press conference, brainstorming, educational debates and other active forms and methods); -case study method (situation analysis); - gaming technologies in which students participate in business, role-playing, simulation games; - information and communication (including distance education) technologies.
Assessment of the student's knowledge
Teacher oversees various tasks related to ongoing assessment and determines students' current performance twice during each academic period. Ratings 1 and 2 are formulated based on the outcomes of this ongoing assessment. The student's learning achievements are assessed using a 100-point scale, and the final grades P1 and P2 are calculated as the average of their ongoing performance evaluations. The teacher evaluates the student's work throughout the academic period in alignment with the assignment submission schedule for the discipline. The assessment system may incorporate a mix of written and oral, group and individual formats.
| Period | Type of task | Total |
|---|---|---|
| 1 rating | Estimated work 1 | 0-100 |
| SAW1 | ||
| Colloquium 1 | ||
| Estimated work 2 | ||
| Testing | ||
| 2 rating | Estimated work 3 | 0-100 |
| SAW2 | ||
| Colloquium 2 | ||
| Estimated work 4 | ||
| Testing | ||
| Total control | Exam | 0-100 |
The evaluating policy of learning outcomes by work type
| Type of task | 90-100 | 70-89 | 50-69 | 0-49 |
|---|---|---|---|---|
| Excellent | Good | Satisfactory | Unsatisfactory |
Evaluation form
The student's final grade in the course is calculated on a 100 point grading scale, it includes:
- 40% of the examination result;
- 60% of current control result.
The final grade is calculated by the formula:
| FG = 0,6 | MT1+MT2 | +0,4E |
| 2 |
Where Midterm 1, Midterm 2are digital equivalents of the grades of Midterm 1 and 2;
E is a digital equivalent of the exam grade.
Final alphabetical grade and its equivalent in points:
The letter grading system for students' academic achievements, corresponding to the numerical equivalent on a four-point scale:
| Alphabetical grade | Numerical value | Points (%) | Traditional grade |
|---|---|---|---|
| A | 4.0 | 95-100 | Excellent |
| A- | 3.67 | 90-94 | |
| B+ | 3.33 | 85-89 | Good |
| B | 3.0 | 80-84 | |
| B- | 2.67 | 75-79 | |
| C+ | 2.33 | 70-74 | |
| C | 2.0 | 65-69 | Satisfactory |
| C- | 1.67 | 60-64 | |
| D+ | 1.33 | 55-59 | |
| D | 1.0 | 50-54 | |
| FX | 0.5 | 25-49 | Unsatisfactory |
| F | 0 | 0-24 |
Topics of lectures
- General information about electromagnetic transients processes
- Steady state three-phase short closures
- The transient process with a sudden short circuit in movable magnetically coupled circuits
- Influence and consideration of the load at the initial moment of a short circuit
- Accounting for an infinite power system when calculating transients
- Practical methods for calculating transients
- Calculation of transient processes for asymmetric short circuits
- Single transverse asymmetry
- Relationships between three-phase short-circuit currents and asymmetrical short-circuit currents
- Consideration of transient resistances at the fault site in case of asymmetric short circuits
- Quality of electromagnetic transients
- Methods and technical means for limiting short-circuit currents
Key reading
- 1. Transient processes in electric power systems: a textbook for universities / I.P. Kryuchkov, V.A. Starshinov, Yu.P. Gusev, M.V. Pirates; ed. I.P. Kryuchkov. – M.: MPEI Publishing House, 2012. 2. Short circuits and asymmetrical modes of electrical installations: a textbook for university students / I.P. Kryuchkov, V.A. Starshinov, Yu.P. Gusev, M.V. Pirates. - M .: MPEI Publishing House, 2018.
Further reading
- 1. Calculation of short circuits and the choice of electrical equipment: a textbook for students of higher education. educational institutions / I.P. Kryuchkov, B.N. Neklepaev, V.A. Starshinov and others; ed. I.P. Kryuchkov and V.A. Starshinov. - 3rd ed., erased. - M .: Publishing Center "Academy", 2018. 2. Kryuchkov I.P. Electromagnetic transient processes in electric power systems. Textbook for universities. - M .: MPEI Publishing House, 2012. 3. Kryuchkov I.P., Kozinova M.A. Three-phase short circuits. Calculation tasks: a methodological guide. – M.: MPEI Publishing House, 2012. 4. Kryuchkov I.P., Volkova N.N. Asymmetrical short circuits. Calculation tasks: a methodological guide. – M.: MPEI Publishing House, 2017.
