### High Voltage Technology and EMC

#### Course Description

Basic definitions and applications of high voltage. Analytical procedures and numerical methods for electric field calculation. Materials in the electric field; dielectric losses and polarization. Electromagnetic field near high voltage transmission lines and plants. Gases as insulators; ionization and deionization, electrical breakdown. Pashen's Law. The origin and effects of alternating and impulse corona. Electrical arc characteristics in circuit breakers; quenching of electrical arc. Liquid insulators; electrical breaktdown theory, dielectric strength. Solid dielectrics; electrical, thermal and electromechanical breaktdown. Partial discharges. High voltage production. High Voltage Measurement. High voltage tests. Coordination of insulation in high voltage systems.

#### Learning Outcomes

1. name and distinguish between the elements of the electric power system used in the high-voltage transmission of electricity
2. define and describe the method of generation and measurement of high voltage
3. describe high voltage insulation systems
4. describe the various processes that lead to the breakdown of high voltage insulation systems
5. define insulation coordination and indicate nominal and test voltages for individual voltage levels
6. identify and classify the types of overvoltages that occur in the power system
7. describe the origin and propagation of traveling waves

#### Forms of Teaching

Lectures

Three hours a week.

Exercises

There will be 5 auditory exercises of 3 school hours each.

Field work

A visit to the transformer factory in ZG will be organized.

Laboratory

There will be 6 laboratory exercises of 2 hours each.

Continuous Assessment Exam
Laboratory Exercises 7 % 10 % 0 % 0 %
2. Mid Term Exam: Written 12 % 30 % 0 %
Final Exam: Written 12 % 30 %
Final Exam: Oral 30 %
Exam: Written 0 % 60 %
Exam: Oral 30 %

#### Week by Week Schedule

1. Generation of high voltages, HV AC test transformers, Cascade of transformers, Measurement of HV in HV lab and HV substation
2. Voltage divider and spark gap, voltage measuring transformers, Applicability of HV in industry and transmission of electrical energy, Analytical methods for electrical field problem solving
3. Numerical methods for electrical field problem solving, Ionization and deionization of gases, The origins and effects of the AC and impulse corona, Materials in the electrical field; Dielectric losses and polarization, Electromagnetic field in the proximity of the HV transmission lines and substations
4. Live voltage working, Solid dielectrics, partial discharges, Electrical, thermal and electromechanical breakdown of solid dielectrics, Liquid dielectrics, electrical breakdown theory
5. Dielectric strength of liquid dielectric, Gases as insulators, Electrical breakdown, Electrical arc in circuit breakers; Characteristics and electrical arc interruption, Pashen's law, Breakdown in homogeneous and inhomogeneous electrical field
6. Generation of high DC voltages, electrostatic generator, Generation of impulse voltages, impulse generator, Tesla's coil (Tesla transformer)
7. Temporary overvoltages, Switching overvoltages, Physical basis of lightning flashes
8. Midterm exam
9. Theory of electro-geometric model of lightning stroke, Basics of lightning location systems, Gas insulated switchgear, Surge Protection, Basics of traveling waves
10. Overvoltage classification according to IEC 60071-1, Traveling waves in overvoltage protection, Wave equation, Reflections and refractures of traveling wave, Petersen's rule, Multiple reflections; Lattice diagram
11. Temporary overvoltages simulation, Ferranti effect, Ferroresonance, The emergence and switching-off of faults, Switchings of unloaded transmission lines, cables, transformers and reactors, Very fast transient overvoltages in gas insulated switchgear, Working principles and protection zone, Metal-oxide (MO) surge arrester, Selection of the MO surge arresters parameters
12. Origin and development mechanism of lightning stroke, Application of lightning location system in power system, Lightning protection of overhead transmission lines, Overvoltage protection of the switchgear, transformers and generators, Deterministical and statistical approach to the insulation coordination, Lightning protection of substations and important objects, Application of electro-geometric model of lightning stroke, Overvoltage protection of low voltage systems, Protective zones, Surge protective devices in low voltage systems, Theory of Electro Magnetic Transient Program (EMTP)
13. Basic concepts, Mechanisms of the disturbance transmission between source and the object, Capacitive and inductive influences on the LV equipment in the HV substation, Tesla transformer as a source of electromagnetic disturbances - laboratory measurements, Lightning protection and impulse response of earthing systems in the substations, The transient potential of the earthing system connected to lightning protection system in case of lightning flash, Recommendations for the reduction of transient overvoltages in secondary circuits of HV switchgears, Acting of electromagnetic interferences on electric circuits, systems, equipment, and living organisms, Survey of EMC standards and regulations, Substation project with regard of EMC protective concept - practical examples
14. Theory and calculation of magnetic field - practical examples, Measurement of magnetic induction in HV laboratory, Theory and calculation of electric field - practical examples, Measurement of electric field in HV laboratory
15. Final exam

#### Study Programmes

[FER3-EN] Electrical Power Engineering - profile
(2. semester)

#### Literature

John Kuffel, Peter Kuffel, Ed Kuffel, Waldemar Ziomek (2016.), High Voltage Engineering fundamentals, Elsevier
C.L. Wadhwa (2007.), High Voltage Engineering, New Age International
Mazen Abdel-Salam (2019.), High-Voltage Engineering, CRC Press
(.), Interni pisani materijali.,
Ravindra Arora, Wolfgang Mosch (2010.), High Voltage and Electrical Insulation Engineering, John Wiley & Sons

#### General

ID 223771
Summer semester
5 ECTS
L3 English Level
L1 e-Learning
45 Lectures
0 Seminar
15 Exercises
12 Laboratory exercises
0 Project laboratory