Fundamentals of Electrical Devices

Lecturer:

Tutor:

Supervisor:

Department of Electric Drives and Traction

Synopsis:

Switching arc in contact switching apparatus, environmental influence on arc property. Switching ability of switching devices. Electrical contacts. Protecting of electric circuits. Breaking of electric circuits under current limiting. Breaking of special electric circuits. Switching over voltage. Surge arresters, its properties, characteristics and application

Requirements:

Activity on laboratory training, measurement remarks and measurement protocols

Syllabus of lectures:

1.Physical fundamentals of switching arc

2.Switching arc theory

3.Short and long switching arc in circuit breakers

4.Switching arc in the air, oil, SF6. Vacuum switching arc

5.Circuit breaker breaking ability

6.Switching device and electrical circuit interaction

7.DC circuit breakers extinguishing chambers

8.AC circuit breakers extinguishing chambers

9.Fuse theory

10.Over-voltage limiting devices

11.Contact theory

12.Contact models

13.Special electric circuits breaking

14.Network switching conditions

Syllabus of tutorials:

1.Laboratory rules, safety instructions

2.DC circuits breaking with contacts in series - part 1

3.DC circuits breaking with contacts in series - part 2

4.AC circuits breaking with air extinguishing chamber - part 1

5.AC circuits breaking with air extinguishing chamber - part 2

6.AC circuits breaking with vacuum extinguishing chamber - part 1

7.AC circuits breaking with vacuum extinguishing chamber - part 2

8.AC circuits interruption with current limiting - part 1

9.AC circuits interruption with current limiting - part 2

10.Fuses time-current characteristics measurement - part 1

11.Fuses time-current characteristics measurement - part 2

12.Over voltage protector limiting characteristics measurement - part 1

13.Over voltage protector limiting characteristics measurement - part 2

14.Final measurement, assement

Study Objective:

Study materials:

1.Flurscheim, C. H. Power circuit breaker theory and design. IEE 1985

2.Ragaller, A. Current interruption in HV networks. Mc Graw - Hill. 1978

Note:

Further information:

No time-table has been prepared for this course

The course is a part of the following study plans: