Learning outcome

After successfully completing the course, the candidate will have achieved the following learning outcomes defined in terms of knowledge, skills and general competence.
Knowledge
The candidate can:

• Calculate the heat energy input to electrical components caused by the current flow, based on the (ohmic) electric resistances, including the dependence on temperature and power frequency. Describe superconductivity phenomena.
• Understand the physical phenomena involved in current transport through electrical contacts.
• Explain the induced currents losses in (ferromagnetic) structures.
• Understand and make estimates for stationary and dynamic heat transfer/accumulation mechanisms involved in the energy and thermal balance of electric components as busbars, cables, transformers and switchgear.
• Calculate or estimate the mechanical forces caused by the passage of high electric currents in conductors and apparatus.
• Master the basic theory of electric arcs, and describe the possible effects of internal short circuit fault arcs in enclosed switchgear on personnel and constructions.

Skills
The candidate can:

• Make estimates of the electrical resistance in switchgear constructions, and calculate the maximum permissible load current for cables, busbars and switchgear.
• Determine possible thermal de-rating of equipment due to increased ambient temperatures or restrictedcooling conditions.
• Calculate, or extract from relevant documentations, the maximum permissible short circuit current due to dynamic thermal and/or mechanical effects.
• Make estimates to document the effects of hot gases and pressure rise caused by arc fault currents on personnel and building constructions.

General competence
The candidate can:

• Demonstrate good attitudes and behavior in HSE in relation to laboratory work.

Course Description

The course gives a detailed overview of the most important physical phenomena determining the behavior of electrical apparatus employed in transmission and distribution of electrical energy.
The course has a special focus on thermal and mechanical phenomena, both in dynamic short circuit conditions, and stationary steady state conditions.

Teaching and Learning Methods

Lectures, exercises, demonstrations, and laboratory exercises.

Assessment Methods

Exercises and laboratory work are mandatory and must be satisfactory documented in order to receive a final grade for the course.
Written final examination (100%). Individual grades (A-F).

Minor adjustments may occur during the academic year, subject to the decision of the Dean