ELECTROTECHNICS, ELECTRICAL PLANTS AND ELECTRICAL RISK
- Overview
- Assessment methods
- Learning objectives
- Contents
- Bibliography
- Teaching methods
- Contacts/Info
The knowledge necessary for a successful learning concerns mathematics; in particular: the principles and laws of trigonometry, the complex numbers and the algebra of the phasors, the foundations of analysis with particular reference to the linear differential equations of the first order.
The methods of verification to ascertain that the student has acquired the knowledge and skills constituting the training objective, consist in passing a written test and an oral test.
The written test, lasting 1.5 hours, proposes the resolution of 3 electro-technical exercises related to part 1 of the "Course contents" section.
The oral exam focuses on the arguments of the parts 2 ^ and 3 ^ of the section "Course contents".
During the oral examination the slides projected during the course are also recorded to verify the actual acquisition of the knowledge and the expected skills.
A degree course in Engineering for the Safety of Work and the Environment can not ignore the teaching of the general principles of electrical engineering and the analysis of risks related to the use of electricity in all its forms.
The knowledge that the teaching aims to provide are those related to the general laws of electrical engineering, the principle of operation of electrical machines, the conformation of electrical systems and related equipment, technical standards.
The skills that the teaching proposes (and therefore the expected learning outcomes) are those related to the knowledge and resolution of elementary electric circuits or to the determination of the tensions, currents and powers at stake, as well as the recognition of risks related to the various types of machines and / or electrical systems and their prevention thanks to compliance with the specific legislation and the technical standards of the CEI and CENELEC. All with particular reference to the principles of security, or to protection against accidental contacts (direct and indirect).
Part 1 ^: Electrotechnics
• Steady-state networks: definitions of electrical quantities, their units of measurement, elementary bipoles and their external characteristics, series-parallel connections, Ohm's law, Kirchhoff's principle, voltage and current divider (5 h).
• Energy and electric power: transmission of power in generators and users (2 h).
• Methods of analysis of linear circuits: principle of superposition of effects, Thevenin and Norton theorems, Millmann's theorem (5 h).
• First order transistors in normal two-port networks (3 h).
• Sinusoidal periodic networks: phasor algebra and representation of sinusoidal quantities, inductive and capacitive reactors, impedance, analysis and resolution of circuits (4 h).
• Active, reactive, apparent power, power factor, power factor correction, Boucherot theorem (6 h).
• Three-phase systems; balanced and unbalanced system, star triangle connection, power measurement, wattmeter insertion (5 h).
Part 2 ^: Electrical machines and installations
• Electrical machines: conductive, insulating and ferromagnetic materials (1 h).
• Transformer: operating principle, construction aspects, selection criteria, MV / LV transformer (2 h).
• Asynchronous motors: operating principle, mechanical characteristics, asynchronous motor applications, high efficiency motors (1 h).
• Direct current motors and generators: overview (1 h).
• Production and transmission of electricity (2 h).
• Classification of low voltage electrical systems (2 h).
• Supply and distribution: operating currents, loads and flows, overcurrents (2 h).
• The system components: the piping, the switching and protection equipment, the electrical panels, the earthing system (2 h).
Part 3 ^: Electrical risk and safety principles
• Physiopathological effects of the electric current on the human body, accident prevention, emergency relief (1 h).
• Protection against accidental contacts: direct and indirect contacts, degrees of IP protection, earth resistance and relationships to be satisfied in TT, TN, IT systems, operating principle of the differential switch and selectivity between differentials (2 h).
• Laws and regulations: Legislative Decree 81/2008, CEI standards, international regulatory situation (1 h).
• Electrical work: CEI EN50110-1 standard, subjects authorized to carry out electrical work, type of works, protection devices and correct methodology for carrying out electrical work (1 h).
A. Porro: Exercises and topics of electro-technical examination, published by Città Studi
L. Olivieri and E. Ravelli: Foundations of electrotechnics and electronics, published by CEDAM
A. Porro and L. Muzzini: Design of low voltage electrical systems, published by CEI
Lectures in the classroom, with the partial aid of projected power point slides.
Exercises using the traditional method and the aid of the blackboard.
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