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Syllabus for

Academic year
MTT040 - High voltage technology
 
Syllabus adopted 2012-02-21 by Head of Programme (or corresponding)
Owner: MPEPO
7,5 Credits
Grading: TH - Five, Four, Three, Not passed
Education cycle: Second-cycle
Major subject: Electrical Engineering
Department: 43 - MATERIALS AND MANUFACTURING TECHNOLOGY


Teaching language: English
Open for exchange students
Block schedule: D

Course module   Credit distribution   Examination dates
Sp1 Sp2 Sp3 Sp4 Summer course No Sp
0107 Examination 7,5c Grading: TH   7,5c   02 Jun 2014 am V,  15 Jan 2014 pm V,  18 Aug 2014 am M

In programs

MPEPO ELECTRIC POWER ENGINEERING, MSC PROGR, Year 1 (compulsory elective)

Examiner:

Professor  Stanislaw Gubanski


Replaces

EEK195   High voltage technology

Course evaluation:

http://document.chalmers.se/doc/6651506a-e675-481c-be2d-168ea04ba17e


Eligibility:

For single subject courses within Chalmers programmes the same eligibility requirements apply, as to the programme(s) that the course is part of.

Course specific prerequisites

High voltage engineering

Aim

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 physical phenomena important for proper functioning of insulation systems in high voltage applications. Focus is set on selection of adequate processes and materials that yield desired electric properties (breakdown and flashover strength, ionisation, conduction and polarisation). 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.

Learning outcomes (after completion of the course the student should be able to)

  • 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 in relation to their constituency.
  • 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; use this knowledge to design a joint or a termination of high voltage cable.
  • 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.

Content

The course is composed of lectures, tutorials, laboratory experiments and project work. In addition, a study trip is organized 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, the finite element method (FEM) for field calculations.
- Breakdown mechanisms: in vacuum, gaseous-, liquid- and solid dielectrics, i.e. streamer mechanism, corona, electronegative gases, arc discharge, arc (current) interruption techniques in gases; bubble and particle initiated breakdown in liquids; intrinsic, thermal- and partial discharge initiated breakdown, treeing in solids.
- Conduction and polarisation: mechanisms of conduction and polarisation 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/diagnostics: measurements of resistivity, dielectric response and partial discharges (pd), characterisation of dielectric systems by means of dielectric response, Schering bridge, non-electric detection, localisation of pd, pd-pattern and fault recognition.
- Phenomena at interfaces: electric strength of insulating systems containing interfaces, outdoor insulation, pollution flashover, composite insulators.

Two laboratory experiments (compulsory) are included:
- electric breakdown in air
- diagnostics of insulation systems (tg delta;, pd)

Project work (compulsory) is included to consolidate the knowledge on electric field calculations. A special software (Comsol Multiphysics), based on the finite element method (FEM), is introduced as a tool. Five projects are prepared - one of them is to be selected:
- chain of cap&pin insulators,
- bushing,
- cable terminations,
- overhead lines and cables,
- interfaces and inhomogeneities in insulation

Organisation

The course comprises of ca 20 lectures (2 x 45 min), 16 tutorials (2 x 45 min), two laboratory exercises (4 h) and a 8 h study visit to a production site for high voltage equipment.

Literature

Kuffel E., Zaengl W. S., Kuffel J., High Voltage Engineering Fundamentals, Newnes 2000, 2nd ed, ISBN 0 7506 3634 3
alternatively
Kreuger F. H., "Industrial high voltage", Vol. I and II, Delft University Press, 1991, 1992, ISBN 90-6275-561-5 and ISBN 90-6275-561-3, respectively, and
Kreuger F. H., "Industrial high dc voltage", Delft University Press, 1995.
ISBN 90-407-1110-0

Examination

Written examination. Grades: Fail, 3, 4 or 5. Approved laboratory exercises including short laboratory reports. Participation in study trip.


Page manager Published: Mon 28 Nov 2016.