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ELECTRICAL INSTALLATIONS

CODE 66117
ACADEMIC YEAR 2022/2023
CREDITS
  • 12 cfu during the 3nd year of 8716 INGEGNERIA ELETTRICA (L-9) - GENOVA
  • SCIENTIFIC DISCIPLINARY SECTOR ING-IND/33
    LANGUAGE Italian (English on demand)
    TEACHING LOCATION
  • GENOVA
  • SEMESTER Annual
    PREREQUISITES
    Prerequisites
    You can take the exam for this unit if you passed the following exam(s):
    • Electrical Engineering 8716 (coorte 2020/2021)
    • MATHEMATICAL ANALYSIS II 60241
    • FOUNDATIONS OF ELECTRICAL ENGINEERING 60334
    • MATHEMATICAL PHYSICS 1 60352
    TEACHING MATERIALS AULAWEB

    OVERVIEW

    66117 – ELECTRICAL INSTALLATIONS 

    Scientific domain: ING-IND/33 Electrical Power Systems 

    European Credit Transfer System Credits (ECTS): 12 

    Duration: 12 + 12 weeks (in two semesters) 

    Lessons schedule: according to Polytechnic School timetable. In addition, experimental activities and panel sessions will be offered. 

    Lecturers: Marco INVERNIZZI – Stefano BRACCO 

    The course covers topics that represent the basic knowledge of electrical power systems through a modelling and practical approach.

    AIMS AND CONTENT

    LEARNING OUTCOMES

    Introduction to the basic topics related to the operation, the design and the planning of electrical systems, analysed as systems of interconnected elements and represented by mathematical or circuital models. Special attention is paid to practical operating conditions

    AIMS AND LEARNING OUTCOMES

    To solve problems related to the analysis of the operation of electrical systems, with emphasis on load-flow calculations and the evaluation of the effects of series and shunt faults, using dimensional values and in "per unit" system. 

    To design and verify various interconnected components of electrical power systems, considering thermal criteria, quality of service requirements, energy and economic aspects. 

    To define properties and characteristics of power line protection systems by evaluating possible alternative solutions. 

    PREREQUISITES

    Skills in solving AC electrical circuits, algebraic and differential equations, calculations using trigonometry and complex numbers. 

    TEACHING METHODS

    Theoretical and practical lectures (5 hours per week), with examples to solve examination problems. 

    Laboratory activities and seminars (additional hours not used for assessment). 

    SYLLABUS/CONTENT

    • Architecture of electricity generation, transmission and distribution systems: characteristics and needs of energy consumers; load diagrams for single and complex users; power generation: power plant types, classification and scheduling strategies to meet load demand; references to distributed generation and polygeneration microgrids. 

    • Electrical circuit modelling and design. Calculation of electrical line parameters. Theory of long lines. Wavelength concept. Modelling and analysis of electrical lines. 

    • Per-unit system: definitions and static applications. 

    • Steady-state sinusoidal regime for the electrical system. Load-flow problem. 

    • Electrical system faults (overcurrents): calculation of symmetrical short-circuit currents. Definition of short circuit power. Analysis of dissymmetrical faults. Method of symmetrical components. Definition of sequence impedances. Sequence filters. 

    • Electrical system faults (overvoltages): Disconnection and interruption of circuits. Arc characteristics and properties, extinguish strategies and devices. Recovery voltages. Dielectric regeneration curves for circuit breakers. 

    • Power system protection. Types and attributes of protection systems associated with various operating conditions and system components. Characteristics of selective protection systems. Protection systems against short circuit and overload. Automatic circuit breakers and fuses. 

    • Designing and test criteria for cable lines. 

    • General background on electrical safety. Reliability and safety definitions. Safety of persons, direct and indirect contacts. Description of earthing systems. 

    • Power factor correction systems: technical and regulatory aspects.

    RECOMMENDED READING/BIBLIOGRAPHY

    R. Marconato, “Electric Power Systems”

    W.D. Stevenson, “Elements of Power System Analysis”

    F. Saccomanno, ”Electric Power Systems – Analysis and Control”

    G. Pratesi, “Le Protezioni dei Sistemi Elettrici di Potenza” (in Italian)

    R. Benato, L. Fellin, “Impianti Elettrici” (in Italian)

    For students with specific needs (workers, non-attending, with SLD) recorded lessons and exercises are available on request.

    TEACHERS AND EXAM BOARD

    LESSONS

    Class schedule

    All class schedules are posted on the EasyAcademy portal.

    EXAMS

    EXAM DESCRIPTION

    For each semester, students must take a written exam (duration: 2 hours) consisting of assignments on the topics described in the Objectives and Learning Outcomes section. Both written exams may be taken on the same day (duration: 4 hours). During written exams, candidate may consult personal notes and texts.

    Candidates who successfully pass the written examination may take the oral examination (duration: about 1 hour). Both oral exams, one for each semester, may be taken on the same day. 

    ASSESSMENT METHODS

    Assessment of the acquisition of practical and theoretical knowledge in calculation methods for the design and operation of electrical power systems. The written examination aims to evaluate the student’s ability to solve numerical problems. The oral examination is designed to assess the students’ knowledge of theoretical and applied aspects related to electrical power systems; in addition, critical thinking skills and the use of an appropriate language, as well as the correct use of unit systems and mastery of the above prerequisites are also considered. 

    Exam schedule

    Date Time Location Type Notes