Ing Ind - Inf (Mag.)(ord. 270) - MI (475) ELECTRICAL ENGINEERING - INGEGNERIA ELETTRICA
093584 - ELECTRICAL SWITCHING DEVICES
052576 - ELECTRICAL SWITCHING DEVICES
This course allows electrical engineering students to learn and understand the operating principles, the design techniques and the application criteria of electrical switching devices, i.e.. devices designed to make or break the current in electric circuits. Operating principles and design techniques are based on an understanding of electrical transients caused by switching, while application criteria make reference to power system design practice and standards.
Risultati di apprendimento attesi
After attending this course, students master the fundamental concepts of transients in electric circuits (DdD1).
They are also able to apply their knowledge of electrical switching devices to the design of equipment and systems, for diversified application areas, including networks/systems for power generation, transmission and distribution, railway transportation systems, industrial automation, and electric vehicles, i.e. automotive, aeronautics, aerospace, and naval sectors (DdD2).
Design abilities include the basic skills to select the appropriate switching device for an application, keeping the different technical trade-offs into account (DdD3), and the communication skills required to explain the technical reasons behind such selection (DdD4).
The acquired knowledge also allows students to keep their technical expertise up-to-date in the future, by understanding technical and scientific literature dealing with electrical switching devices, and distinguishing innovative aspects from established design solutions, with the purpose to contribute to technological innovation of the electrical engineering sector (DdD2 and DdD3).
1) Current making and breaking. Ideal circuit breaker. Opening and closing transients in circuits.
2) Real world circuit breakers and other electromechanical apparatus: technical data, definitions and testing.
3) Processes associated with breaking of currents: electric arc, interrupting means, contact operation; typical circuit breaker designs.
4) Electrical switching devices employed in low voltage power distribution: short circuit protection, ground fault protection, selectivity and coordination.
Basic circuit theory and ability to solve simple steady-state AC and DC circuits is required. Knowledge of phasor representation of AC electrical quantities is a recommended prerequisite.
Modalità di valutazione
Exam includes a written test and an oral session. Before the exam, each student shall submit the solution of an exercise proposed during the lab sessions of the course.
The homework exercise has the purpose ot test the student's ability to apply the knowledge acquired during the course to a specific case, choosing the proper mathematical tools to describe the electrical system under consideration.
The written test includes multiple-answer questions and/or numerical exercises: it aims to test the knowledge and understanding of topics taught in the course.
The oral session includes:
- theoretical questions about the course topics, aimed to test acquired knowledge and communications skills
- questions requiring the students to establish connections of course topics between them and with topics of other courses, with the purpose of additionally probing ability to apply knowledge, judgement skills and ability to effectively communicate reasons for technical choices
Arieh L. Shenkman, Transient Analysis of Electric Power Circuits Handbook, Editore: Springer, Anno edizione: 2005, ISBN: 978-0-387-28797-3 Note:
particularly chapters 1 and 2
Allan Greenwood, Electrical Transients in Power Systems, Editore: Wiley-Interscience, Anno edizione: 1991, ISBN: 0-471-62058-0 Note:
Chapters 3, 4, 5, and 6.
Lou van Der Sluis, Transients in Power Systems, Editore: John Wiley and Sons, Anno edizione: 2001, ISBN: 0-471-48639-6 Note: