Electrotechnics

DEGREE IN FOREST ENGINEERING AND NATURAL ENVIRONMENT (GEFMN)
1. Provide the student with the basic fundamentals of electrical engineering in order to know the applications and needs of the use of electrical installations.
2. Know and understand the basic elements of an electrical installation and the interaction between them.
3. Develop electrical installation projects within the scope of their competences.

DEGREE IN AGRICULTURAL AND AGRICULTURAL ENGINEERING (GEAA)
1. Know, understand and use the principles of rural engineering: electrotechnics.
2. To know, understand and use the electrical circuits of alternating current, relating them to the applications and needs of the employment of the electrical installations.
3. Design and direct transport lines and electricity distribution networks and select, protect and operate electrical receivers in accordance with current regulations.

The memoirs of the title includes the following contents for this subject:
Single phase alternating current. Power and energy (11 hrs face-to-face, 16 hrs non-contact).
Three-phase alternating current. Power and energy (11 hrs face-to-face, 16 hrs non-contact).
Electric calculation of lines and distribution networks (8 hours in person, 12 hours off-site).
Electrotechnical Regulation for Low Voltage (1 hour in person, 2 hours off-site).
Lighting technology and lighting installations (2 hours in person, 3 hours off-site).
Protection and security installations (3 hours in person, 5 hours off-site).

These contents will be developed in more detail below. The duration estimate is approximate, depending on the teaching needs.
Exhibition classes and seminars
Topic 1. Alternating currents.
1.1. General concept of waveforms.
1.2. Generation and values associated with the sine wave forms. Law of Faraday- Lenz.
1.3. Complex representation of a sinusoidal magnitude.
1.4. Symbolic expression of Ohm's Law.
Topic 2. Simple circuits with sinusoidal excitation. Calculation methods
2.1. Resolution of circuits formed by simple passive elements.
2.2. Pure resistive circuit.
2.3. Pure capacitive circuit.
2.4. Pure inductive circuit.
2.5. Impedance and complex admittance.
2.6. Analysis of circuits in series and in parallel.
Topic 3. Power and energy in the sinusoidal steady state.
3.1. Power and energy
3.2. Power and energy in the basic passive elements.
3.3. Instantaneous, average and flutter power in a passive dipole.
3.4. Apparent and reactive powers.
3.5. Complex power Boucherot's theorem.
3.6. Power factor (f.d.p.).
3.7. Correction of the power factor. Capacitor banks.
Unit 4. Three-phase systems.
4.1. Definitions.
4.2. Polyphase systems used in practice.
4.3. Generation of three-phase voltages.
4.4. Connection of sources in balanced star.
4.5. Load connection in balanced star.
4.6. Unbalanced star load connection: displacement of the neutral.
4.7. Connection of single-phase and three-phase receivers to a three-phase 4-wire system.
4.8. Connection of triangle loads.
4.9. Star triangle equivalence in balanced systems.
Unit 5. Power in three-phase systems.
5.1. Power in balanced loads connected in star.
5.2. Power in balanced loads connected in a triangle.
5.3. Correction of the power factor.
Topic 6. Calculation of electrical lines.
6.1. Types, materials and parameters of power lines.
6.2. Tension fall.
6.3. Maximum admissible current per line.
6.4. Regulatory specifications.
6.5. Distribution networks.
Topic 7. Protection of electrical installations
7.1. Types of protections.
7.2. Protections against overloads.
7.3. Protections against direct contacts.
7.4. Protections against indirect contacts.
Topic 8. Lighting technology.
8.1. Fundamental principles of lighting technology.
8.2. The production of light. Types of lamps
8.3. Calculation of lighting installations.
The interactive teaching will work with problems and practical cases derived from the theoretical contents.

Practical contents
The practical contents are structured in three 2-hour practices in the electrical engineering laboratory:
1. Recognition of protection material and control and realization of three-phase asynchronous motor start diagrams.
2. Star-delta start of three-phase asynchronous motor.
3. Introduction to the application of detectors and programmable logic controllers/lighting calculation using computer programs.

BASIC BIBLIOGRAPHY
1. Fraile Mora, J. Electromagnetism and Electrical Circuits. College of Civil Engineers, Canals and Ports. McGraw-Hill / Interamericana de España. 2005
2. Fernández, MD, González, MA., Rodríguez, MR. Fundamentals of Electrotechnics. Unicopia Campus of Lugo, SL 2004.
3. Fraile Mora, J. Introduction to Electrical Installations. College of Civil Engineers, Canals and Ports. Schools Collection. Madrid 1993
4. Alexander, CK, & NO Sadiku, M. (2000). Fundamentals of Electrical Circuits. McGraw-Hill Education. 2017.

COMPLEMENTARY BIBLIOGRAPHY
1. RBT. Electrotechnical Regulations for Low Voltage and Complementary Technical Instructions. Application Technical Guide.
2. Torres, José Luis., “Low voltage installation systems”, AENOR editions. Madrid, 2006. 250 pax.
3. Moreno, N., Cano, R., García Trasancos J. Low Voltage Electrical Installations, Thomson. Madrid, 2004.
4. Rabbit, AJ and others. Electrical installations. McGraw Hill. 2007.
5. Roger Folch, J. et al. Electrical technology. Ed. Synthesis. 2000.
6. Torres, JL Low Voltage Installation Systems. AENOR Editions. Madrid, 2006.
7. Makarov, SN, Ludwig, R., & Bitar, SJ Practical electrical engineering. Springer International Publishing. 2019.

DEGREE IN FOREST ENGINEERING AND NATURAL ENVIRONMENT (GEFMN)
General competences:
CG9: Knowledge of hydraulics, construction, electrification, forest roads, machinery and mechanization necessary both for the management of forest systems and for their conservation.
Transversal competences:
CT1: Capacity for analysis and synthesis.
CT3: Individual work capacity with self-critical attitude.
CT4: Ability to work in a group and cover problematic situations collectively.
CT10: Use of bibliographic and internet information.
Specific competences:
CECF8: Ability to know, understand and use the principles of: Electrotechnics and Forest Electrification.

DEGREE IN AGRICULTURAL AND AGRICULTURAL ENGINEERING (GEAA)
General competences:
CG1: Knowledge in basic, scientific and technological subjects that allow a continuous learning, as well as an ability to adapt to new situations or changing environments.
CG2: Ability to solve problems with creativity, initiative, methodology and critical reasoning.
Transversal competences:
CT1: Capacity for analysis and synthesis.
CT3: Individual work capacity, with a self-critical attitude.
CT4: Ability to work in a group and deal with problematic situations collectively.
CT7: Ability to make an exhibition in public in a clear, concise and coherent way.
CT10: Use of bibliographic and Internet information.
Specific competences:
CEG2: Adequate knowledge of physical problems, technologies, machinery and water and energy supply systems, the limits imposed by budgetary factors and constructive regulations, and the relationships between facilities or buildings and agricultural operations, agri-food industries and spaces related to gardening and landscaping with its social and environmental scope, as well as the need to relate those and that area with human needs and the preservation of the environment.
CR7 - Ability to know, understand and use the principles of rural engineering: calculation of structures and construction, hydraulics, engines and machines, electrical engineering, technical projects.
CR10 - Ability to know, understand and use the principles of technology transfer, understand, interpret, communicate and adopt advances in the field of agriculture.

The classroom teaching will be developed through the application of the following methodologies:
Expositive teaching (24 hours), taught as a master class with the support of blackboard and video cannon. The following competences will be worked on: GEFMN: CT1, CT3, CG9, CECF8; GEAA: CG1, CG2, CT1, CT3, CEG2, CR7.
Seminar teaching (6 hours) distributed throughout the semester, taught through participatory class where they will propose and solve exercises related to the theoretical content taught. The following competences will be worked on: GEFMN: CT1, CT3, CG9, CECF8; GEAA: CG1, CG2, CT4, CT7, CT10, CEG2, CR7, CR10.
Practical teaching (6 hours): carried out in the electrical engineering laboratory and / or in the computer room where the methodology will be as follows: brief explanation of the work that will be developed and carried out by the students. The following competences will be worked on: GEFMN: CT4, CT10, CG9, CECF8; GEAA: CG1, CG2, CT4, CEG2, CR7.
Tutorials in small groups (2 hours) distributed in the weeks of expository and interactive teaching where the questions proposed by the students will be solved. The competences demanded by the students will be worked on.
Non-contact work is fundamental in the learning of the subject and in the degree of interaction of the students that must develop:
• Autonomous work and independent study. Competencies: GEFMN: CT1, CT3, CG9, CECF8; GEAA: CG1, CT1, CT3, CEG2, CR7.
• Study of theory, performance of exercises and problem solving. Competencies: GEFMN: CT1, CT3, CG9, CECF8; GEAA: CG2, CT1, CT3, CT10, CEG2, CR7.
• Group work and cooperative learning. Preparation of group course work/s. Learning based on the resolution of practical cases and projects. Competencies: GEFMN: CT4, CT10, CG9, CECF8; GEAA: CG1, CG2, CT1, CT4, CR7, CR10.
• Evaluation of competences through control exercises. Carrying out self-assessment control exercises throughout the course. Competencies: GEFMN: CG9, CECF8; GEAA: CG1, CG2, CT1, CEG2, CR7.

To teach, the following resources will be used:
• Making presentations by computer.
• Use of classic and digital slates.
• Use of the virtual campus to provide the following material:
1. Development of the theoretical agenda.
2. Questionnaires and exams.
3. Resolved exercise bulletins
4. Proposed exercise bulletins
5. Practice scripts
6. Course works scripts
7. Other information of interest
• Microsoft Teams
• Free software for calculation and simulation.

Students' learning will be monitored through the realization of: final exam, work / s of course and use of the practices that includes attendance and delivery of the memory of practices, according to the following table.

Assessment system Competencies (GEFMN) Competencies (GEAA) Weight in the rating
Oral tests and / or writings CG9, CECF8 CG1, CG2, CT1, CEG2, CR7 70%
Work delivered and / or exposed CT3, CT10, CG9, CEGF8 CT4, CT5, CT7, CR10 15%
Practices CT4, CG9, CECF8 CEG2, CR7 15%

The percentage dedicated to exams (70%) can be obtained either in the final exam or in the different partial tests, which will eliminate the corresponding topics. The works and other activities developed in the classes and the internship report must be submitted within the established deadlines, which will be at most the date of the first evaluation period exam. The course work will have to be exposed in class for each group. Students who have completed the subject and pass practices in previous years will not have to repeat them while retaining the qualification from the previous year.
To overcome the matter it is necessary that the following two requirements are met:
• obtain a minimum grade of 4 points out of 10 in the evaluation sections of exams.
• the overall score obtained as weighting according to the table of exams, works and practices should be at least 5 points out of 10.
In case the student has not passed the subject in the first evaluation period, he / she must present the final exam in the second evaluation period examining the whole subject, since partial grades will not be retained. The grade of not presented will be reserved for those students who do not have any qualification in the different sections of the evaluation.
The students who have been granted the attendance waiver according to Instrucción 1/2017 de la Secretaría General, will be able to deliver all the activities that are carried out throughout the course, since they will be provided in the Virtual Campus, so their evaluation will be in the same conditions than other students.
For cases of fraudulent completion of exercises or tests, the provisions of the Regulations for evaluating the academic performance of students and reviewing grades will apply. The fraudulent completion of any exercise or test required in the evaluation of a subject will imply the qualification of fail in the corresponding call, regardless of the disciplinary process that can be followed against the offending student. It will be considered fraudulent, among others, the realization of works plagiarized or obtained from sources accessible to the public without reworking or reinterpretation and without citations to the authors and sources.

Study time and personal work that a student must devote to overcome it
PRESENTIAL HOURS
Expository classes: 24.0
Seminars: 6.0
Practices: 6.0
Group tutorials: 2.0
Subtotal: 38.0
Review and revision: 4.0
Total: 42.0

NON-PRESENTIAL HOURS: 70.5
Study and preparation of contents: 54
Jobs and practices: 12.0
Exam preparation: 4.5

TOTAL HOURS: 112.5

It is recommendable that students have completed and passed the Physics subjects. Likewise, the domain of vector, differential and integral calculus and operations with complex numbers is recommended. For the study of the matter is very important the continued study of it which requires:
1. Prior reading of the theoretical topics before their explanation in class.
2. Attention in the theoretical classes and resolution of the doubts that arise.
3. Study of the theoretical topics and resolution of the questionnaires.
4. Application of the acquired concepts to exercises and problems with follow-up of the teacher.
5. Resolution of exercises and problems autonomously.
6. Realization of the course work.
7. Realization and understanding of the practices.

The language used will be Galician.
The admission of students enrolled in the laboratory of practices requires that they know and comply with the "general rules of safety in the laboratories of practices" of the University of Santiago de Compostela. This information is available on the website (http://www.usc.es/estaticos/servizos/sprl/normalumlab.pdf).
DEGREE IN FOREST ENGINEERING AND NATURAL ENVIRONMENT (GEFMN)
The student body enrolled in the subject will have ongoing face-to-face attention during tutoring hours in office number 12 of hall 2, 2nd floor above. In addition attention will be paid through the Virtual Campus, MSTeams and the teacher's email: manuelramiro.rodriguez@usc.es

DEGREE IN AGRICULTURAL AND AGRICULTURAL ENGINEERING (GEAA)
The student body enrolled in the subject will have ongoing face-to-face attention during tutoring hours in office number 14 of pavilion 2, 2nd floor above. In addition attention will be paid through the Virtual Campus , MSTeams and the teacher's email: mdolores.fernandez@usc.es