# TET4130 - Power System Transients

### Examination arrangement

Examination arrangement: Written examination

Evaluation form Weighting Duration Examination aids Grade deviation
Written examination 100/100 4 hours D

### Course content

Introductory description of high voltage equipment and substations. Analysis of overvoltages in electrical systems in addition to an overview of protective measures as design, grounding, shielding and surge protection. Overvoltages caused by lightning, circuit breaker operations, ground fault and resonances are discussed and analyzed analytically. Methods for analytical calculation of voltages and currents in circuits with physical extension is emphasized. This implies calculation and measurement of travelling waves in power systems. An overview of ligthning overvoltages in high and low voltage systems, lightning protection and lightning induced overvoltages as well as switching overvoltages and temporary overvoltages is given. Ideal computational models valid for the voltage and frequency ranges represented by the overvoltages are established. Different types of overvoltage protective devices in both high- and low-voltage systems are described with a focus on metal oxide arresters. Overview on dimensioning and location of protection in the system to avoid damage to equipment. Introduction to computer calculation of transients with EMTP.

### Learning outcome

Knowledge:
After completing this course the candidate shall:
- understand the source and characteristics of lightning, switching, and temporary overvoltages.
- understand travelling wave propagation on transmission lines.
- understand the critical switching transient situations.
- be able to set up differential equations for RLC circuits and solve it via stationary and transient solutions.
- understand the mode of operation and dimentioning criteria for surge arresters.
- understand the physical and electrical construction of high voltage systems.

Skills:
After completing this course the candidate shall be able to:
- contribute to a reliable operation of high voltage systems.
- carry out simple, analytical calculations of overvoltages and currents in power systems.
- set up lattice diagrams and make calculation in systems with two reflection points.
- utilize EMTP programs in a critical and effective way for calculation of power system transients.
- dimentioning surge arresters in power systems.

The student will also have increased his/hers abilities to use instruments and equipment in the laboratory.

### Learning methods and activities

Lectures. Compulsory exercises, computer exercise, laboratory experiments.

### Compulsory assignments

• Laboratory work with report
• Computer exercise with report
• Exercises

### Further on evaluation

If there is a re-sit examination, the examination form may change from written to oral.

### Specific conditions

Exam registration requires that class registration is approved in the same semester. Compulsory activities from previous semester may be approved by the department.

Compendium.

### Credit reductions

Course code Reduction From To
SIE1030 7.5

# Timetable

Detailed timetable

# Examination

Examination arrangement: Written examination

Term Statuskode Evaluation form Weighting Examination aids Date Time Room *
Spring ORD Written examination 100/100 D
• * The location (room) for a written examination is published 3 days before examination date.
If more than one room is listed, you will find your room at Studentweb.