Electric Traction

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Electric Traction

Course Description

Electric traction supply systems: 600 V, 1500 V and 3000 V dc, 15 kV alternating at 16 2/3 Hz, and 25 kV and 2x25 kV alternating at 50 Hz. Economic criteria and conditions for railway electrification. Main components of electric traction systems: power sources, electric traction substations, electric traction motors. Types of contact networks: uncompensated, semi-compensated and compensated. Mathematical model of electric traction vehicle movement; driving modes. Traction force. Calculation of electrical conditions in the contact network: voltages, power and energy required for traction. Sizing of stable electric traction substations. Influence of unsymmetrical load of the traction substations on a three-phase high voltage network. Influences of electrified lines on interference and hazard voltages in telecommunication circuits and on signaling and control devices. Electric and magnetic fields under contact lines and near electrical traction facilities. Electric power supply of high-speed railway .

Learning Outcomes

define the basic physical laws and principles required to model the traction system
explain the method of calculation of traction and braking of trains
describe existing traction power systems
describe the main components of the electrical traction system
perform the power supply calculation of stable traction power substations
analyze the environmental impact of stable electric traction substation

Forms of Teaching

Lectures

Lectures will be held 2 hours a week.

Exercises

Auditory exercises will be held in 7 cycles lasting 2 hours per week.

Field work

Visit to traction station Zaprešić.

Independent assignments

Seminar.

Grading Method

	Continuous Assessment		Exam
Type	Threshold	Percent of Grade	Threshold	Percent of Grade
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			50 %	30 %
Exam: Oral				50 %

Week by Week Schedule

DC 600 V, 1500 V and 3000 V, AC 15 kV 16 2/3 Hz, 25 kV and 2x25 kV 50 Hz
Economic and technical criterions and conditions for railway electrification
Main components of electrical traction systems: traction power substations, railway network section switchgear
Construction and types of the contact line systems: non-compensated, semi-compensated and compensated
Determination of the electrical parameters of the railway traction lines
Regime of traction vehicle drives, tractive effort, 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
Midterm exam
Power and energy demand, Connections of the stable traction power substations in the three phase power system
Allowed unsymmetry of voltages and currents, Radial and parallel operation of traction substations
Supply of the 2x25 kV system from the 1x25 kV system, Interference- and danger- voltages in telecommunication, signal and control circuits and equipment
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
Power supply of high speed rail, Electromagnetic levitation
Final exam