OBIETTIVI FORMATIVI

The teaching of shipboard electrical systems aims to consolidate the skills of the maritime students in an application context of the knowledge of electrical engineering. Training proposals are proposed on the knowledge of the principal components and main characteristics associate to electrical machines. The correct definition and basic sizing and operation of power system distributions and protection devices.

OBIETTIVI FORMATIVI (DETTAGLIO) E RISULTATI DI APPRENDIMENTO

At the end of the course the student is expected:

• to know and comprehend the operation of a shipboard power system and the interaction between electric machines, power distribution system, generators and loads.
• to solve problems related to the operation of electrical machines;
• to solve problems related to the operation and protection of the power distribution;
• to know the elements related to the hazard of high voltage system for shipboard application;
• to know the procedure to follow in order to safely operate high voltage system on ships.

PREREQUISITI

The student expected background to fully understand the content of the course is related to the basics of electric circuits, especially AC systems, single phase and three phase, and electromagnetism.

MODALITA' DIDATTICHE

Theoretical lectures in class (or via Teams according to the COVID situation) and practical exercises during the lectures.

Working students and students with certified SLD (Specific Learning Disorders), disability or other special educational needs are advised to contact the teacher at the beginning of the course to agree on teaching and examination arrangements so to take into account individual learning patterns, while respecting the teaching objectives.

PROGRAMMA/CONTENUTO

The course will cover the following topics:

Fundamentals of electrical machines employed in shipboard systems, e.g. transformer, asynchronous machine, synchronous machine, DC machine and special machines:

• general introduction to electric machines;
• structures and operating principles;
• equivalent circuits;
• rated data and plate;
• operation of transformers in parallel
• torque and current characteristics of motors and generators;
• methods of AC motors start-up and speed control.

Electrical Power Distribution Boards and Electrical Equipment

• description of the transmission and distribution of electrical power
• suitable layout of power distribution system employed in maritime applications;
• electric cables operation (thermal and voltage drop analysis);
• short circuits;
• power System protections (circuit breaker, fuse, disconnects switch, relays).

High Voltage system in shipboard applications

• general overview of the specific elements related to the operation of High voltage system;
• hazard related to high voltage electrical systems;
• effect of current on human body;
• typical switchboard layout, operation and maintenance;
• safety procedure and equipment (Personal Protective Equipment - PPE) to operate on high voltage shipboard systems.

TESTI/BIBLIOGRAFIA

• M. Piattelli, ‘Impianti Elettrici sulle navi', Tighler 2007
• M. Ceraolo, ‘Sistemi Elettrici Navali’, Accademia Militare 2006