Reliability and quality of electricity
Description: The article considers the quality indicators of electricity, the reasons causing the deviation of quality indicators from their normative values, as well as ways to maintain the required voltage quality standards. Statistical indicators of the reliability of restored systems and their definition are given, some questions of the mathematical apparatus of the theory of reliability are outlined.
Amount of credits: 5
Пререквизиты:
- Transient Processes
Course Workload:
| Types of classes | hours |
|---|---|
| Lectures | 30 |
| Practical works | 15 |
| 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
- To study the quality indicators of electricity, the reasons for the deviation of quality indicators from their standard values, as well as ways to maintain the required voltage quality standards.
Objective
- Statistical indicators of the reliability of restored systems and their definition are given, some questions of the mathematical apparatus of the theory of reliability are outlined.
Learning outcome: knowledge and understanding
- Evaluate the impact of various factors on the reliable operation of electric power systems and grids
Learning outcome: applying knowledge and understanding
- Use technical means to measure and control the main parameters of the technological process
Learning outcome: formation of judgments
- To be able to determine the parameters of equipment of objects of professional activity
Learning outcome: communicative abilities
- Have the ability to calculate operating modes of objects of professional activity
Learning outcome: learning skills or learning abilities
- To acquire new knowledge in conducting research work, to be able to apply the theoretical knowledge obtained in practice, to analyse the operation of electric power systems, to be able to process the results of experiments
Teaching methods
The discipline is interconnected with the disciplines of the core academic disciplines of the curriculum: mathematics, chemistry, descriptive geometry and engineering graphics, physics, computer science, theoretical mechanics, physical foundations of electronics, electrical and structural materials science, theoretical foundations of electrical engineering, applied mechanics, metrology, standardization and certification, basics electromechanics, theoretical foundations of electrical engineering, electrical machines, general energy, theory of automatic control, power electronics, electrical and electronic devices, electric drive, fundamentals of the theory of reliability.
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 | Power quality in electricity supply systems. | 0-100 |
| Electricity metering.Methods of reliability analysis in power supply systems | ||
| Neutral modes of distribution networks | ||
| Oral questioning | ||
| Routine control 1 | ||
| 2 rating | Reactive power compensation | 0-100 |
| Interior lighting installations | ||
| Electricity distribution | ||
| Oral questioning | ||
| Routine control 2 | ||
| 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 | |
| The policy for assessing student achievements is based on the principles of academic integrity, unity of requirements, objectivity and fairness, openness and transparency. The discipline involves completing tasks of 2 rating controls (weeks 8 and 15) and passing an exam. Depending on the quality of assimilation of theoretical knowledge, a score is given from 0 to 100%. | A complete, detailed answer to the question posed is given, the totality of conscious knowledge about the object is shown, the main provisions of the topic are conclusively revealed; the answer shows a clear structure, a logical sequence that reflects the essence of the concepts, theories, and phenomena being revealed. Knowledge about an object is demonstrated against the background of understanding it in the system of a given science and interdisciplinary connections. The answer is stated in literary language in scientific terms. There may be shortcomings in the definition of concepts, which are corrected by the student independently during the answering process. | A complete, but insufficiently consistent answer to the question posed is given, but at the same time the ability to identify essential and non-essential features and cause-and-effect relationships is demonstrated. The answer is logical and stated C+ 70-74 in scientific terms. There may be 1-2 mistakes made in defining basic concepts, which the student finds difficult to correct on his own. | An incomplete answer was given, representing scattered knowledge on the topic of the question with significant errors in definitions. There is fragmentation and illogical presentation. The student does not realize the connection of this concept, theory, phenomenon with other objects of the discipline. There are no conclusions, specificity and evidence of the presentation. Speech is illiterate. Additional and clarifying questions from the teacher do not lead to correction of the student’s answer not only to the question posed, but also to other questions in the disciplines | A complete, detailed answer to the question posed is given, the totality of conscious knowledge about the object is shown, the main provisions of the topic are conclusively revealed; the answer shows a clear structure, a logical sequence that reflects the essence of the concepts, theories, and phenomena being revealed. Knowledge about an object is demonstrated against the background of understanding it in the system of a given science and interdisciplinary connections. The answer is stated in literary language in scientific terms. There may be shortcomings in the definition of concepts, which are corrected by the student independently during the answering process. |
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
- Introduction
- Areas of work to improve the quality of electric power The Company's activities are aimed at improving the quality of electric energy in the process of operation of electrical installations in power supply systems
- Areas of work to improve the quality of electric power The Company's activities are aimed at improving the quality of electric energy in the process of operation of electrical installations in power supply systems
- Directions of organisational and technical measures to improve the quality of electrical energy during the operation of electrical installations in power supply systems
- Electricity quality indicators
- Management of technological processes of transmission, distribution and utilisation of electric energy, which allows improving the quality of electric energy
- Assessment of electric power quality in the process of operation, maintenance and repair of electrical installations in power supply systems
- Electromagnetic compatibility of power supply system equipment and technological installations during operation, maintenance and repair of electrical installations in power supply systems
- Assessment of electromagnetic compatibility of equipment during operation, maintenance and repair of electrical installations in power supply systems
- Technical solutions to improve the quality of electrical energy, electrical installations and maintenance and repair technologies in power supply systems
Key reading
- Electronic Library of the Training and Methodological Centre for Railway Transport Education https://umczdt.ru/books/
- Titkov V. V. Physical fundamentals of high voltage, strong magnetic fields and currents technology. fields and currents: textbook - Polytechnic University Publishing House, 2011, 185 с. - [Electronic resource]. - URL: http://biblioclub.ru/index.php?page=book_view_red&book_id=362996
- Olkhovsky V. Я. Power supply systems: textbook - NSTU, 2015, 262 p. - [Electronic resource]. - URL: http://biblioclub.ru/index.php?page=book_view_red&book_id=438343
Further reading
- Shekhovtsov V.P. Calculation and design of power supply schemes: - FORUM, INFRA-M 2014, 214 p.:il
