Study Guide

Objective

The student:
- knows about switchgears, measuring transformers and work protection in electrical stations
- knows and is able to calculate short-circuit effects and currents
- knows about the impact of reactive power on the electrical network and how to compensate for it
- knows the control of electrical power.

Content

Switchgear and power stations.
Short-circuit currents and short-circuit power.
Compensation.
Control of electrical power..

Location and time

Spring semester 2024

Materials

The lectures as power point presentations, will be found on Moodle.
Based on the books:
Sähkölaitostekniikan perusteet by Elovaara & Laiho
Elkraftsystem 1 & 2 from Elkrafthandboken
In addition, various links to material will be posted on Moodle.

Teaching methods

Lectures.
Excercises.
Laboration.
Self studies.

Completion alternatives

Written exam.
Laboration.
Lab report.

Student workload

A total of 81 hours, of which contact lessons are six weeks with two lessons of two hours per week. In addition, one laboratory session of 4-5 hours.

Evaluation scale

H-5

Assessment criteria, satisfactory (1)

Knows different switchgear and general equipment as well as distribution transformers.
Knows how the short-circuit current is propagated.
Knows about the effect of the reactive power on the net.
Knows different control options.

Assessment criteria, good (3)

Understands the use of current and voltage transformers and other equipment and work protection.
Can calculate short-circuit current, short-circuit power and earth-current current.
Capable of sizing capacitor battery and choke.
Understands the control principle from the control center.

Assessment criteria, excellent (5)

Can design appliances and busbar systems for switchgear and observe work protection when working in switchgear and power stations.
Can calculate short-circuit current and short-circuit power over transformer.
Understands the use of automatic battery and the risk of overcompensation.
Understands the principle of TCP / IP control.

Assessment methods and criteria

The written exam consists of five questions of 6 points, with a total of 30 points. About half theoretical questions, other half calculations.
In the calculation exercises, an answer gives full points if the calculations are complete with the right values ​​and the correct answer. Careless errors give deductions.
The lab is assessed with a score of 1-10, ie a maximum of 10 points. The report is primarily assessed, but the own activity during the laboratory session is also taken into account.

Qualifications

The course Basics in Electrical Engineering, AC.