IRE30821 High voltage technology and relay protection (Autumn 2025)

Compulsory course for class of 2024-2027 in Bachelor's degree in engineering - electrical: electronics and green energy, as well as for TRESS and the Y-veien associated with this study programme.

Elective subject for class of 2025-2028 in Bachelor's degree in engineering - electrical: electronics and green energy, as well as for TRESS and the Y-veien associated with this study programme.

• Dimensioning criteria for high-voltage insulation
• Electric field strength in various configurations
• Lightning surges
• Switching overvoltages
• Symmetrical components
• Transient conditions in the network and electrical machines during short circuits
• Types of relays, operation and setting
• Overcurrent protection, Differential protection, Impedance protection, special protection for electrical machines
• Calculation of short-circuit currents in the network based on the Impedance method

Knowledge
The student 

• has a theoretical basis for being able to perform short-circuit calculations in high-voltage power systems 
• can calculate fault current/the setting of protection in simple high-voltage networks 
• knows material properties that are important for the electrical stress of high-voltage insulation and knowledge of the most commonly used insulation materials.
• can apply and understand simplified theoretical models for calculation/estimate for voltage stresses of electrical equipment during operational stress, temporary overvoltages, atmospheric overvoltages and switching overvoltages in the network.
• understands load flow calculation approach, perform insulation coordination calculation.

Skills
The student 

• can carry out short-circuit analyzes using symmetrical components 
• can use the per unit model when calculating voltage drops and losses in the grid.
• can perform calculations for fault current in the power network, insulation coordination, travelling wave transients.

General competence
The student 

• understands relay scheduling 
• understands the operation of various types of relay protection for grids and components in the energy supply 
• understands procedure for insulation coordination in a substation.

• 1 group report from laboratory assignments/Assigned design (analysis) calculations, relevant to the course topics.
• Approved 4 out of 6 exercises

Required coursework is assessed as approved/not approved. Required coursework must be approved before the student can sit for the exam. 

Written exam, individual. Duration: 5 hours

Allowed aids: Issued formula sheet. Calculator, with empty memory, which cannot calculate symbolically or communicate wirelessly. 

Grading scale: A-F.