Electric Power Systems 1

  • Class 45
  • Practice 23
  • Independent work 82
Total 150

Course title

Electric Power Systems 1

Lecture type


Course code






Lecturers and associates

Course objectives

Fundamentals of engineering, standards and IEC standards; Legislation; Permits.
Bus bars; Power transformer; Insulators; Isolators; Capacitors; Voltage regulators; Earthing and protection system; Incoming and outgoing lines; Switchyard; Substation design and construction.
Principles of operation of transformers; Equivalent circuit and voltage equations; Main and leakage flux; Magnetization current; Inductances; No-load and short-circuit test; Equivalent circuit parameters; Basics of construction of winding and core.
Model of line; Model of transformer; Model of feeder; Simple load model.
Model of generator; Model of asynchronous motor; Model of power plant.
Equivalent circuit diagram for short-circuits; Methods of calculation; Calculation of parameters of short-circuit currents; IEC and other relevant standards; Single phase to ground fault; Double phase fault; Double phase to ground fault; Three phase fault; Three phase to ground fault.
Thermal equivalent short-time current; Thermal strength of equipment; Determining optimal cross-section of conductors; Peak short-circuit current; Calculation of stresses in rigid conductors; Forces on supports.
Midterm exam.
Circuit breakers; Disconnectors; Reclosers; Busbar configurations; Insulation and protection by insulating; Transformers selection and construction; Circuit breakers and disconnectors selection and construction; Earthing and requirements regarding earthing design.
Switches; Fuses; Load brake switches; Switching device combinations.
Parallel connection; Connection groups; Autotransformer; Intrinsic rated power; Losses; Efficiency; Temperature rise; External characteristics; Voltage drop.
Control systems in substations; Monitoring systems in substations; Measuring systems in substations; Communication systems in substations; Protection systems in substations; Reactive power compensation systems; Instrument transformers selection; Auxiliary systems in substations.
Project task; Location selection and data collection; Design, layouts and documentation (CAD); Master project; Circuit diagram and connection plans; Consents and approvals.
Expert supervision over the equipment development and facility construction; Construction, testing and commissioning; Safety; Environmental impacts; Costs and financial analysis; Timescales.
Final exam.

Prerequisites for:

  1. Electric Facilities Design
  2. Low-voltage Power Systems

Required reading

(.), Visokonaponska rasklopna postrojenja; H. Požar; Tehnička knjiga, Zagreb; 1990; ISBN: 8670591057,
(.), Transparencije s predavanja,
(.), Electric Power Substations Engineering; J.D. McDonald; CRC Press; 2003; ISBN: 0849373832, 9780849373831,
(.), Introduction to Electric Power Systems; ( MIT OpenCourseWare; MIT; 2005; ISBN: -,
(.), Symmetrical Components for Power Systems Engineering; J. Lewis Blackburn; Marcel Dekker; 1993; ISBN: 0849376181, 9780849376184,
(.), Power System Analysis John Grainger, Jr., William Stevenson McGraw-Hill 1994

Minimal learning outcomes

  • Define basic parts of electric facilities and their purposes
  • Identify basic parts of electric facilities on field
  • Describe current-voltage conditions in balanced and unbalaced systems
  • Solve short circuit problem on simple power system example
  • Distinguish between different arc interrupting techniques
  • Argue about utilization of given electric product in specific location in the system
  • Employ softvare tool NEPLAN for power system modeling and short circuit calculations
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