### Electric Traction Power Supply

#### Course Description

Power supply systems for electrical traction: direct voltages 600 V, 1500 V, 3000 V, alternating voltage 15 kV with frequency 16 2/3 Hz), alternating voltages 25 kV and 2x 25 kV with frequency 50 Hz. Economic criterions and conditions for railway electrification. Main components of electrical traction systems: electric power sources, traction power substations and tractive engines. Type of the contact line systems: non-compensated, semi-compensated and compensated. Mathematical model of the train movement: regime of traction vehicle drives. Tractive effort. Calculation of the electrical conditions in the contact line system: voltages, powers and energy demanded for the traction. Dimensioning of the stable traction power substations. Influences of the two-phase traction substation connections on the unsymmetry in the three phase power system. Impact of contact line systems on interference- and danger- voltages in telecommunication circuits on signal and control equipment. Electric and magnetic fields below the contact line in the vicinity of electric traction. Power of electric high speed rail.

#### General Competencies

Knowledge of electric traction systmes working principle, calculations methods, dimensioning and their enivormental impact.

#### Learning Outcomes

1. define the basic physical laws and principles necessary for modeling the traction system
2. explain the calculation method of traction and braking trains
3. describe the existing power systems of electric traction
4. describe the main components of the electric traction system
5. apply a railway power flow calculation
6. analyze environmental impacts of railways

#### Forms of Teaching

Lectures

Llectures are two hours per week.

Exams

It consists of exams and seminars.

Consultations

After the lecture or by appointment.

Seminars

Practical work of students.

Internship visits

Visit of the new electric substation Zaprešić.

Continuous Assessment Exam
Homeworks 0 % 15 % 5 % 0 %
Class participation 0 % 5 % 0 % 0 %
Seminar/Project 0 % 20 % 10 % 0 %
Mid Term Exam: Written 0 % 25 % 0 %
Final Exam: Written 0 % 20 %
Final Exam: Oral 15 %
Exam: Written 30 % 50 %
Exam: Oral 50 %
##### Comment:

To access the oral examination is necessary to collect 50 points from homework, mid-term exams and the written part of the final exam.

#### Week by Week Schedule

1. Overview of the traction power supply: direct voltages 600 V, 1500 V, 3000 V, alternating voltage 15 kV with frequency 16 2/3 Hz, alternating voltages 25 kV and 2x 25 kV with frequency 50 Hz.
2. Economic and technical criterions and conditions for railway electrification.
3. Main components of electrical traction systems: traction power substations, contact line systems, railway network section switchgear.
4. Construction and types of the contact line systems: non-compensated, semi-compensated and compensated.
5. Determination of the electrical parameters of the railway traction lines.
6. Mathematical model of the train movement: regime of traction vehicle drives. Tractive effort.
7. Calculations of the electrical conditions in the contact line system: voltages, powers and energy demanded for the traction. Calculations of fault currents in the power supply systems for electrical traction.
8. 1st knowledge test
9. 1st knowledge test
10. Locations and sizing of the stable traction power substations; power and energy demand.
11. Connections of the stable traction power substations in the three phase power system; allowed unsymmetry of voltages and currents.
12. Radial and parallel operation of traction substations in power supply systems. Supply of the 2x25 kV system from the 1x25 kV system.
13. Impact of contact line systems on interference- and danger- voltages in telecommunication, signal and control circuits and equipment.
14. Electric and magnetic fields under contact lines and in proximity of the traction power installations. Influences of eddy currents on underground metallic pipes and cables.
15. Power supply of very high speed trains. New power supply for rapid transport systems; electromagnetic levitation.

#### Study Programmes

[FER2-HR] Electrical Power Engineering - profile
Specialization Course (2. semester)

#### Literature

F. Kießling, R. Puschmann, A. Schmieder (2002.), Contact Lines for Electrical Railways: Planning - Design - Implementation, Wiley
I. Švaljek, T. Kožulj, M. Bošnjak (2003.), Tehničko-eksploatacijski pokazatelji i značajke vučnih vozila Hrvatskih željeznica, Željeznička tiskara d.o.o
3. V.A Profillidis (2006.), Railway Managment and Engineering third edition, British Library cataloguing in Publication Data
J. Zavada (2004.), Željeznička vozila i vuča vlakova, Fakultet prometnih znanosti, Zagreb
K. KARWOWSKI, A. SZELAG (2009.), Modern Electric Traction, Power Supply, Gdank University of Technology, Gdansk

#### General

ID 34445
Summer semester
4 ECTS
L1 English Level
L1 e-Learning
30 Lectures
0 Seminar
0 Exercises
0 Laboratory exercises
0 Project laboratory