101131 - ELECTRICAL SYSTEMS

Subject type: Mandatory

Coordinator: Joan Triadó Aymerich

Trimester: Third term

Credits: 6

• Catalan

L'idioma d'impartició és el català, però no es descarta fer ús també de textos en anglès i en castellà. L'estudiant podrà fer ús en tot moment del català, anglès o castellà indistintament.

The purpose of the Electrical Systems subject is to train the students of the Engineering Degree in Industrial Electronics and Automation, and the Degree in Mechanical Engineering so that they are able to understand, interpret and perform fundamental calculations in the field of the theory of circuits and electrical machines. In addition, the use of mathematical tools corresponding to linear systems are useful for all industrial degrees: Industrial organization; Mechanics; and Electronics and industrial automation. 

1. Analysis of resistive circuits in direct current

1.1 Magnitudes and electrical units. Ohm's Law Circuit elements: Resistors, voltage and current sources.

1.2 Short circuit and open circuit. Elements in series and in parallel.

1.3 Kirchhoff's laws. Knot analysis. Mesh analysis.

1.4 Superposition theorem. Theorems of Thévenin and Norton.

Related activities:

Classes of theoretical explanation with resolution of exercises. Large group.

Practice 1: DC circuit. Small group.

Resolution of exercises and assignments. Non-face-to-face activity.

First partial test and final test. large group

2. Title content 2: Transient response

2.1 Coils and capacitors.

2.2 Study of the transient response in circuits with continuous sources containing resistors, capacitors and coils. 

2.3 Continuity conditions in coils and capacitors.

2.4 Complete response as sum of natural and forced responses.

2.5 Use of the Laplace Transform in solving linear circuits.

2.6 Graphical representations of functions.

Related activities:

Classes of theoretical explanation with resolution of exercises. Large group.

Practice 2: Circuits with transients. small group

Resolution of exercises and assignments. Non-face-to-face activity.

First partial test and final test. large group

3. Alternating current circuits

3.1 Permanent sinusoidal regime. Phasor transform.

3.2 Calculation of circuits in the frequency domain with phasors and impedances.

3.3 Electrical power in alternating current.

3.4 Effective values ​​of voltages and currents. Effective value phasors.

3.5 Complex power. Active, reactive, apparent power and power factor.

3.6 Three-phase circuits. Star and delta connection. Simple and compound tenses.

3.7 Line, phase and power quantities in balanced three-phase loads.

Related activities:

Classes of theoretical explanation with resolution of exercises. Large group.

Practice 3: Alternating current circuits. small group

Resolution of exercises and assignments. Non-face-to-face activity.

First partial test and final test. large group

4. Complex frequency. Frequency response.

4.1 Complex frequency. Sinusoidal functions with exponential amplitude. Transformed into s. 

4.2 Transfer functions.

4.3 Frequency response.

4.4 Bode diagrams.

4.5 Passive filters.

Related activities:

Classes of theoretical explanation with resolution of exercises. Large group.

Practice 4: Frequency response. Small group.

Resolution of exercises and assignments. Non-face-to-face activity.

final test large group

5. Introduction to Electric Machines.

5.1 Classification of electrical machines: transformer, generators and motors.

5.2 Nominal values, losses and performance.

5.3 Single-phase and three-phase transformer.

5.4 Asynchronous machine: three-phase induction motor.

Related activities:

Theoretical explanation classes. small group

Practice 5: Transformer and asynchronous motor. small group

Resolution of exercises and assignments. Non-face-to-face activity.

final test large group

The final grade of the ordinary assessment will be the weighted average of the grades of the assessable activities:

• Grade for both exams: 70% of the subject
  • First partial test 40% of the theory grade
  • Final exam (all subject matter of the course) 60% of the theory mark (or 100% of the theory mark if it exceeds the weighted average mark of Theory)

The grade of both exams must be equal to or higher than 3,5. If it is not achieved, it will not be averaged with the rest of the grades. 

• Practice grade: 25% of the subject
  •  The practices will be assessed based on the previous calculations, the work observed in the classroom and the reports delivered. All practices have the same value and some of them have no value for evaluation purposes, as will be noted. 

Before carrying out the practice, you can ask for the preliminary calculations for the practice to be done. This test and these previous calculations will be taken into account in the evaluation of the practice grade.

• Exercise grade: 5% of the subject

The first partial test can be recovered with the final test. If the weighted grade of the exams is worse than the final grade, only the final grade will be taken into account. 

For all students who have not passed the subject in the regular assessment, there will be a make-up exam for the exam part only. Practices and exercises will not be recoverable. This recovery exam will be for the whole subject, parts will not be examined separately. The grade of this recovery (70%) will be averaged with the practices (25%) and with the Exercises (5%). 

Alexander Charles, Sadiku Matthew, Fundamentals of electric circuits, 7th edition, McGraw Hill (C) 2021

Schaum's Outline of Electric Circuits, Seventh Edition (SCHAUMS' ENGINEERING). ISBN: 978-1260011968

William H. Hayt, J E. Kemmerly, Jamie Phillips, Steven M. Durbin, Analysis of circuits in engineering. 9th ed.. McGraw-Hill, 2019. ISBN 9781456272135.

Rabbit, Antonio. Electrical circuits for engineering. 1ª ed .. Madrid: McGraw-Hill, 2004. ISBN 8448141792.

Svodoba James, Dorf Richard Introduction to electric circuits 9th edition. Wiley 2014