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Course: 2022/2023

High voltage engineering

(14001)

Bachelor in Electrical Power Engineering (2008 Study Plan) (Plan: 166 - Estudio: 222)

Coordinating teacher: MARTINEZ TARIFA, JUAN MANUEL

Department assigned to the subject: Electrical Engineering Department

Type: Electives

ECTS Credits: 6.0 ECTS

Course:

Semester: 2º

Requirements (Subjects that are assumed to be known)

Fundamentos de Ingeniería Eléctrica Líneas y subestaciones eléctricas Circuitos Magnéticos y Transformadores

Objectives

-Understanding essential properties of electrical insulating materials. -Knowledge about degradation mechanisms acting on insulating materials. -Analysing the interaction between different degradation mechanisms enhancing premature ageing of electrical equipment. -Understanding the behaviour of High Voltage (HV) generation and measurement circuits. -Calculating electrical stresses applied to one insulating material taking into account the knowledge of its design. -Getting useful information about acceptance and maintenance tests that certify the insulation status of electrical equipment subjected to High Voltages.

Skills and learning outcomes

Link to document

Description of contents: programme

Theoretical sessions. 1. Introduction. 1.1. High Voltage equipment. 1.2. Electrical, thermal and mechanical stresses applied to electrical equipment. 1.3. Insulation coordination. 1.4 Asset Management. 2. Electrical insulating materials. 2.1. Insulating gases. 2.1.1. Ionization process. 2.1.2. Air. 2.1.3. SF6 and other gases. 2.1.4. Applications 2.1.5. Degradation processes. 2.2. Insulating liquids. Applications and degradation processes. 2.3. Insulating solids. 2.3.1. Breakdown at insulating solids. 2.3.2. Applications. 2.3.3. Degradation mechanisms. 2.3.4. Partial discharges (PD) and tg delta. Equivalent circuit. 3. Devices for insulation tests. 3.1. High voltage generation circuits: AC, DC and impulse tests. 3.2. HV measurement circuits. 4. Insulation systems design. 4.1. Electrical stresses analysis in simple geometries. 4.2. Dielectric strength in common materials. 4.3. Introduction to manufacturing techniques in power cables and electric machines. 5. Degradation mechanisms in electrical equipment. 5.1. General issues. 5.2. Insulated power cables. 5.3. Insulators and bushings 5.4. Aerial conductors. 5.5. Switchgears. 5.6. Power transformers. 5.7. Rotating machines. 6. Maintenance tests for insulation status evaluation. 6.1. Insulation resistance measurement. Polarization index. Applications to different equipment. 6.2. AC and DC withstanding voltages. 6.3. Lightning and switching impulses tests. Surge tests. 6.4. Capacitance and tg delta measurement. Applications to different equipment. 6.5. PD measurements. Applications to different equipment. 6.6. Specific evaluation methods for transformers. 6.7. Specific evaluation methods for generators. 6.8. Fault location in power cables. Practical sessions: 1.- Introduction to the HV laboratory and safety rules. Impulse tests. 2.- Insulation resistance measurements in power transformer and surge tests measurements in one rotating machine. 3.- Capacitance and tg delta measurements. 4.- PD tests.

Learning activities and methodology

- Learning in big groups (theoretical approach), learning in small groups (solving doubts), individual meetings to solve doubts (ask for them by email), individual student work. Theoretical knowledge (3 ECTS). - Laboratory learning (4 sessions), learning in small groups (solving practical problems), individual meetings to solve problems (ask for them by email), individual student work. Practical knowledge (3 ECTS).

Assessment System

Laboratory qualification:
The qualification will consider the solution to questions in the script after session and behavior and respect for safety rules (15%).
 


1st examination (May):
40% will be one final examination. 
45% will be a continuous evaluation made at small groups. Each small group professor will explain his evaluation criteria, but there will be, at least, 3 exercises along the course. 
In addition to this, depending on the number of the students in the subject, professor could qualify one voluntary report to do individually or in groups. This report could, as a maximum, increase the continuous evaluation mark in 30%.
15% will be the practical mark. 

It is possible to pass the subject without doing the final examination. In order to achieve this, the student must have a continuous evaluation (85%) and practical (15%) mark above 6/10.



2nd examination (June):
If the student followed the small group evaluation, the final examination will be the same as in 1st examination (May). If not, the examination will have a maximum value of 100%, but the practical mark should be above 5/10.

If the student did not attend to lab sessions, he/she will have to pass an additional lab examination which must be solved without any mistake. 



In order to pass the subject (1st or 2nd examination), students must reach one overall qualification of 5 points in a maximum of 10 points.

% end-of-term-examination 40
% of continuous assessment (assigments, laboratory, practicals...) 60

Calendar of Continuous assessment

Basic Bibliography

J.A. Martínez Velasco ,. Coordinación de aislamiento en redes eléctricas de Alta Tensión,. McGraw Hill.
J.M. Martínez Tarifa, J. Sanz Feito. Aislamiento Eléctrico de Equipos de Alta Tensión. Garceta. 2020
Khalifa M.;. High Voltage Engineering. Theory and Practice,. Marcel Dekker.
Kreuger F.H.;. Partial Discharge Detection in High-Voltage Equipment,. Butterworth & Co..
P. Gill;. Electrical Power Equipment Maintenance and Testing;. Marcel Dekker.
R.E. James, Q. Su;. Condition assessment of High Voltage Insulation in Power System Equipment;. Institution of Engineering and Technology;.
Stone G., Boutler E.A., Culbert I., and Dhirani H.;. Electrical Insulation for Rotating Machines: Design, Evaluation, Aging, Testing and Repair;. IEEE Press Series on Power Engineering, Wiley Interscience.

Additional Bibliography

D. Kind and H. Kärner;. High-voltage insulation technology : textbook for electrical engineers;. Braunschweig : Vieweg;.
E. Kuffel, W.S. Zaengl, and J. Kuffel;. High Voltage Engineering: Fundamentals;. Butterworth-Heinemann;.
H.M. Ryan ;. High Voltage Engineering and Testing;. Institution of Electrical Engineers.
N.H. Malik;. Electrical Insulation in Power Systems;. Marcel Dekker.
R. Bartnikas and E. J. McMahon;. Engineering Dielectrics;. ASTM American Society for Testing and Materials;.
R.W. Sillars;. Electrical Insulating Materials and their Applications;. Ann Arbor, University Microfilms International;.
T.J. Gallagher and A.J. Pearmain;. High voltage: measurement, testing, and design;. Wiley.

The course syllabus may change due academic events or other reasons.