Courses

Electrical Installations

General

Course Contents

1. Aspects of electric power production, transmission and distribution. Generators, transformers, transmission lines. Voltage levels: High, Medium and Low voltage.
2. Nominal values of three-phase systems. 20/0.4 kV transformers in Dyn configuration. IT, TT, TN-C, TN-S, TN-C-S grounding systems.
3. Dangers and measures against electric shock. Safe voltage levels. Often mistakes in installations. Proper and improper neutral grounding. Residual Current Device.
4. Safety measures during operation and maintenance of electrical installations. Step voltage, touch voltage. Reference to norms and regulations: ELOT, HD 384, Cenelec, IEC, ITU.
5. Typical domestic and industrial power distribution. Switchgear, types of switches, types of fuses. Relays and conductors. Thermal relays and thermomagnetic circuit breakers.
6. Components of automation panels and installations: time relays, limit switches, inductive and capacitive sensors, counters, various types of relays, PLCs.
7. Marking and numeration of contacts. Schematic symbols.
8. Power cables: basic types and usages. Color code of installation power cables. Cable types and cable colors inside power and automation panels.
9. Calculation of current carrying capacity of cables, installation conditions and methods, operational conditions, electrical, thermal and mechanical strain.
10. Examples of power cables calculations.
11. Sizing of switchgear and fuses. Protection of power lines and installations.
12. Examples: simple automation circuits, Star/Delta starter, motor reversing.
13. Presentation of exemplary installations. Presentation of good practice guidelines.

Educational Goals

The course is designed to provide the theoretical and practical knowledge on the basic principles of electrical installations with an emphasis on industrial installations. It concentrates on the chapters of electrical power systems regarding power distribution on the level of medium and low voltage and on some simple automation configurations based on relays. Upon successful completion of the course the student will be able to:
a) Recognize the category of the grounding method of a power system.
b) Understand the importance and the impact of the various voltage levels.
c) Have a clear understanding of the dangers involved in the construction, operation and maintenance of electrical installations.
d) Understand the design of a typical power distribution system on the medium and low voltage level.
e) Read and comprehend a schematic of a power distribution system.
f) Calculate the required conductor cross-section in a typical electrical installation.
g) Estimate the proper protection of a power line.

General Skills

Using corresponding technologies
Research, analysis and synthesis of data and information
Decision making
Autonomous work
Teamwork – distribution and delegation of responsibilities
Working in an international environment
Working in an interdisciplinary environment
Project design
Adherence to professional ethics
Promoting free, creative and inductive thinking

Teaching Methods

Lectures, Projected Presentations, E-mail and facebook communication, Online Synchronous and Asynchronous Teaching Platform (moodle). Recorded lectures available on moodle.

Students Evaluation

Assessment Language: Greek
Final written examination with short answer questions and more elaborate questions (problem solving).

Recommended Bibliography

1. Petros Ntokopoulos, Electrical Installations of Medium & Low Voltage Consumers., Ziti Pelagia and Co., ISBN: 960-431-155-7, 2002 (in Greek)
2. Seip Gunter G., Electrical Installations Handbook, ISBN-10: 3800914670, Publicis; 2nd edition, 1987.