EI3330 Insulation Diagnostics and Monitoring of Power Equipment, PhD Course 5.0 credits

Isolationsdiagnostik och tillståndskontroll för kraftapparater, doktorandkurs

The course covers existing methods used for diagnostics and monitoring of electric power apparatuses.

  • Education cycle

    Third cycle
  • Main field of study

  • Grading scale

    P, F

Information for research students about course offerings

The course is given when there is sufficient demand. Please contact the examiner if you are interested in taking the course.

Intended learning outcomes

After the course, the student should be able to:

  • describe the mechanisms behind ageing and deterioration of electrical insulation systems
  • describe the principle of operation for basic methods of diagnostics and monitoring
  • analyze the information content given by the different instruments
  • analyze possible error sources in the results
  • use and develop models for interpretation of measurement results based on equipment design and material properties
  • identify when there is a need or not for a complementary high voltage stress test

Course main content

Overview of insulating materials in high voltage equipment. Electrical insulation systems and design concepts. Degradation mechanisms and defects. Basic methods for diagnostics and monitoring based on insulation resistance, loss tangent, and capacitance. Advanced methods based on dielectric spectroscopy, polarisation and depolarisation currents, recovery voltage. Partial discharge measurements based on oscilloscope techniques, phase resolved acquisition techniques, acoustical PD measurements, PD localisation. On-line techniques. Chemical and physical analyzing methods. High voltage test methods: AC, DC and impulse. Power equipment: generators, breakers, transformers, cables, capacitors, outdoor insulation, etc.


Lectures (12*2h = 24h), 6 homework problems, presentations by participants on solutions to homework problems (2*6h = 12h), 1 individual project on a particular component and with a particular method, 3 field measurements: cable, transformer and generator


MSc in electrical engineering, physical engineering or similar. The course FEI3230 is good to have, but not compulsory.


R.E. James and Q.Su, Condition Assessment of High Voltage Insulation in Power System Equipment;  Compendia: H.Edin, Insulation diagnostics and monitoring of power equipment, containing lecture notes, articles and selected chapters from other books.


  • EXA1 - Examination, 5.0, grading scale: P, F

Requirements for final grade

Participated (short presentation every time) in 5 out of 6 homework problems. Accepted (80% correctness) solutions to 5 of 6 homework problems.  Participated in 2 out of 3 field measurements. Accepted solution to individual project.

Offered by

EECS/Electromagnetic Engineering


Hans Edin <edin@kth.se>


Course syllabus valid from: Autumn 2011.
Examination information valid from: Spring 2019.