Course syllabus
Course-PM
MTT040 MTT040 High voltage technology lp4 VT21 (7.5 hp)
Course is offered by the department of Electrical Engineering
Contact details
|
Activity |
Name |
Tel.ext. |
name@chalmers.se |
|
Examiner and lecturer 1 |
Yuriy Serdyuk (YS) |
1624 |
yuriy.serdyuk |
|
Lecturer 2 |
Xiangdong Xu (XX) |
1641 |
xiangdong.xu |
|
Invited Lecturer |
Kristian Gustafsson (KG), NKT Cables |
|
|
|
Invited Lecturer |
Thomas Hammarström (TH), Chalmers EPE |
1649 |
thomas.hammarstrom |
|
Invited Lecturer |
Tord Bengtsson (TB), Hitachi Power Grids |
|
|
|
Tutorials |
Yuriy Serdyuk Xiangdong Xu |
|
|
|
Project work |
Yuriy Serdyuk |
|
|
|
Laboratory exercise 1 (Electric breakdown) |
Jian Zhao Sarath Kumara |
1608 1686 |
zjian sarath.kumara |
|
Laboratory exercise 2 (Diagnostics) |
Jörgen Blennow Douglas Jutsell Nilsson |
1625 1686 |
jorgen.blennow jutsell |
|
Lab. demonstration (Polariz. & conduction) |
Xiangdong Xu Yuriy Serdyuk |
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HV laboratory manager Electrical safety |
Thomas Hammarström |
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Course purpose
The course builds up the knowledge gained during the course on “High Voltage Engineering” (MTT035) and it aims at preparing students to carry out engineering tasks involving design, laboratory testing as well as maintenance of high voltage components in power systems and in other technological applications through understanding of the physical phenomena involved. Focus is set on selection of adequate processes and materials that yield desired electric properties (breakdown and flashover strength, ionization, conduction and polarization). Based on this understanding, the knowledge on design criteria for insulation dimensioning and on principles for insulation diagnostics is built, including elucidation of basic differences in insulation systems for ac and dc applications.
After successful completion of the two courses in high voltage engineering and high voltage technology, belonging to the master program on electric power engineering, the student is well prepared to carry engineering tasks involving apparatus design, laboratory testing as well as maintenance of high voltage components in power systems and in other technological applications. In addition, the two courses together constitute a solid base for post-graduate studies within electrical power engineering.
The course is composed of lectures, tutorials, laboratory experiments and project work. In addition, a study visit to Hitachi production facilities in Ludvika is included to demonstrate manufacturing of high voltage devices and their testing.
Lectures and tutorials cover the following topics:
- Electric fields: field distribution in practical dielectric systems, capacitance calculations; geometric, capacitive and resistive field grading; finite element method (FEM) for field calculations.
- Breakdown mechanisms: in vacuum, gaseous, liquid and solid dielectrics; streamer mechanism, corona, electronegative gases, arc discharge, arc interruption techniques in gases; bubble and particle initiated breakdown in liquids; intrinsic, thermal and partial discharge initiated breakdown; treeing in solids.
- Conduction and polarization: mechanisms of conduction and polarization in insulating media, dielectric response, concepts of resistivity (conductivity), permittivity and dielectric losses.
- Insulation materials and systems: insulation systems in practice, organic and inorganic materials for insulation, impregnated insulation, composite insulation, ageing and life expectancy.
- DC insulation: materials for DC applications, capacitive and resistive field distribution including transient states, influence of surface and space charges, principles for measuring charge distribution, influence of a thermal gradients.
- Advanced measuring techniques and diagnostics: measurements of resistivity, dielectric response and partial discharges (PDs), characterization of dielectric systems by means of dielectric response, Schering bridge, non-electric detection and localization of PDs, PD-pattern and fault recognition.
- Phenomena at interfaces: electric strength of insulating systems containing interfaces, outdoor insulation, pollution flashover, composite insulators.
Two laboratory exercises (Lab1 and Lab2) and one demonstration (D1) are included:
- Electrical discharges and electric breakdown in air (Lab1),
- Diagnostics of insulation systems (Lab2)
- Electric conduction and polarization workshop (D1).
Project work is included to consolidate the knowledge on electric field calculations. Software COMSOL Multiphysics, based on the finite element method (FEM), is introduced as a tool. Five course projects are prepared, one of them is to be selected:
- Chain of cap-and-pin insulators,
- Transformer bushing,
- Cable termination,
- Overhead lines and cables,
- Insulators for polluted environment.
Schedule
Day Date Time Room Topic and literature reference Teacher
Tue 23/03 08-09 Zoom (L1): Course organisation, introduction YS to laboratory exercises and workshop
Tue 23/03 10-12 Zoom (L2): Electric fields in high voltage components YS Chapters 1, 2.1, 2.2
Wed 24/03 08-10 Zoom (L3): Material- and field-controlled design YS Chapters 5.1-5.4, 7
Fri 26/03 08-12 Zoom (T1&T2): Field calculations (analytical) XX
Exercise examples
Tue 30/03 08-10 Zoom (L4): Capacitive and resistive field distributions, XX measurements of electric charges Chapter 2.4
Tue 30/03 10-12 Zoom (T3): Capacitive and resistive field distributions XX Exercise examples
Wed 31/03 08-10 Zoom (L5): Gas discharges, streamers and corona YS Chapters 3.2.1-3.2.3, 3.2.5
========================== Easter break ===================================
Tue 13/04 08-10 Zoom (T4): Gas discharges, streamers and corona YS Exercise examples
Tue 13/04 10-12 Zoom (L6): Electric arcs, high voltage breakers YS Chapters 3.2.7.1, 3.2.7.2, handouts
Wed 14/04 08-10 Zoom (L7): Electric breakdown in liquids YS Chapter 3.3, 3.4, 3.5, handouts
Fri 16/04 08-10 Zoom (L8): Electric breakdown in solids YS Chapter 3.3, 3.4, 3.5, handouts
Fri 16/04 10-12 Teams (L9): High voltage cables technology and testing, KG invited lecture NKT Cables
Tue 20/04 08-10 Zoom (L10): Surface discharges, outdoor insulation, YS pollution flashover, insulators for polluted environment Chapter 3.2.6, handouts
Tue 20/04 10-12 Zoom (L11): Paper impregnated insulation YS Chapter 5.5, handouts
Wed 21/04 08-10 Zoom (L12): Assessment of failure risk, new trends in YS insulation systems, environmentally friendly solutions Handouts
Fri 23/04 08-12 Zoom Virtual study visits to Hitachi Power YS Grids in Ludvika: Power Transformers, HPG HV Bushings, High Power Lab, HVDC staff
Tue 27/04 08-11 Zoom (L13): Introduction to FEM and Comsol Multiphysics. YS Field and capacitance calculations (numerical).
Chapters 2.5.1, 2.5.4
Tue 27/04 11-12 Zoom (P1): Introduction to project work YS
Wed 28/04 08-10 Zoom (L14): Polarisation and conduction, interfacial YS polarisation Chapter 4, handouts
Tue 04/05 08-10 Zoom (L15): Measurements of dielectric loss and partial XX discharges Chapters 3.6, 4, 6.4.1, 6.4.2, 6.4.7
Tue 04/05 10-12 Zoom (T5): Measurements of dielectric loss and partial XX discharges Exercise examples
Wed 05/05 08-10 Zoom (P2): Project work - consultation YS
Fri 07/05 08-10 Zoom (L16): Diagnostics of high voltage equipment, TB invited lecture HPG Chapter 6.4, handouts
Fri 07/05 10-12 Zoom (L17): Partial discharges at rapidly varying voltages, TH invited lecture EPE Chalmers
Tue 11/05 08-12 Zoom (D1): Conduction and polarisation, demonstration YS and modelling, XX home assignment
Wed 12/05 08-10 Zoom (P3): Project work - consultation YS
Tue 18/05 08-10 Zoom (L18): Insulation coordination in low voltage XX systems Handouts
Tue 18/05 10-12 Zoom (L19): Digital substations XX Handouts
Wed 19/05 08-10 Zoom (L20): Non-power strong-field technologies YS Handouts
Fri 21/05 08-12 Zoom Project work (self-study, finalizing) YS*
Tue 25/05 08-12 Zoom Project presentations YS
Fri 28/05 09-11 Zoom Exam consultation YS XX
Tue 01/06 PM Exam YS*
* YS is available via Zoom for questions
Course literature
The main course book is Andreas Küchler, “High Voltage Engineering. Fundamentals, technology, applications”, Springer Verlag, Germany, 2018, ISBN 978-3-642-11992-7 (electronic version is available via Chalmers library). The chapters recommended for reading before lectures are indicated in the schedule below. Additional handouts of the lecture materials will be available on the course website.
Course design
The teaching is pursued in form of lectures (40h), tutorials (10h), project work (10h), demonstration (4h), laboratory exercises (2x4h) and study visit (4h). A project reporting session (4h) and exam consultation (2h) are also included. Participation in the lectures and tutorials are voluntary, but highly recommended. The laboratory exercises, demonstration, project work and study visit are compulsory.The course materials, including handouts and labs descriptions, are available for the course participants on the course website in Canvas.
Laboratory experiments (compulsory)
Two compulsory laboratory experiments (4h each) are included in the course. The exercises aim at providing insight on (i) development of electrical discharges in air, and (ii) classical diagnostic methods for quality assessment of insulation systems.
Before participating in the experiments in the high voltage laboratory, each student must study safety instructions, certify their understanding, and thereafter follow the rules exactly. The instruction manual contains two parts. The first part, entitled General Safety Instructions for the Electric Power Engineering and High Voltage Engineering Laboratories and Workshops, is completed by the second one, entitled Addition to General Safety Concerning Operations and Testing in High-Voltage Laboratories and at Outdoor Test Plants. The instructions can be found on the course website.
The laboratory exercises will take place during weeks 15-17 (Lab 1: discharges and breakdown in air, starts 14/04) and weeks 18-20 (Lab 2: insulation diagnostics, starts 5/05). Time booking for the laboratory exercises is to be made through the course web page. The exercises are to be held in the High Voltage Laboratory (EPE, room 2506). All students must follow covid19-related rules which will be explained on place by the lab supervisors.
NOTE! Students will not be allowed to proceed with the exercises without being adequately prepared. The same applies to late arrivals. Short lab reports should be prepared after each of the exercises for final approval.
Changes made since the last occasion
Updated lecture materials and tutorials, new lecture L19.
Learning objectives and syllabus
Learning objectives:
- Recognize various types of apparatuses and insulators in high voltage substations and networks and explain phenomena leading to their failure; understand criteria for insulator selection.
- Identify insulating materials and systems most frequently used in high voltage technology and characterise their advantageous and disadvantageous properties.
- Calculate or estimate electric field strength and its distribution in real insulation systems exposed to ac and dc high voltages; analyse the importance of geometrical design for optimizing electric field distributions.
- Apply computer based tools for solving complex field distribution problems in various high voltage components; demonstrate the outcomes of your simulations and communicate them to other students.
- Possess knowledge on allowable working electric stresses in different insulation systems.
- Be acquainted with different methods for controlling electric field distribution in high voltage devices.
- Explain physical mechanisms responsible for various types of electric discharges in gases with special emphasis to streamer, barrier (partial), surface and arc discharges.
- Describe the influence of different parameters, like electrode geometry, temperature, humidity and pressure, on the electric strength in different insulating materials.
- Evaluate risk for appearance of partial discharges in insulation systems containing defects.
- Define and describe the mechanisms of electric conduction, polarisation and breakdown in gaseous, liquid and solid insulating materials (dielectrics).
- Identify the dielectric response in insulating materials an systems; explain how measurements of dielectric response can be used for diagnostics of high voltage devices.
- Recognize environmental risks imposed by different materials used in high voltage technology.
Link to the syllabus on Studieportalen.
Examination form
To receive a final grade, approved written examination, laboratory exercises, workshop and project work are required.
Course summary:
| Date | Details | Due |
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