Electric Apparatus

The course is a substitute for:

Electric Apparatus (E14EPR)

Lecturer:

Tutor:

Supervisor:

Department of Electric Drives and Traction

Synopsis:

Introduction to electric apparatus. Switching AC and DC circuits. Basic theory and characteristics of arcs. Short term and long term switching arcs. Interaction between turn-off devices and switching circuits. Recovery voltage. Switching-off small inductive and capacitive currents. Switching arcs in various environments. Basic properties of switching and protection devices.

Requirements:

Syllabus of lectures:

1. Introduction in switching problems.

2. Interruption of electric circuits with and without arcs

3. Short switching arc in circut breakers

4. Long switching arc in circuit breakers, post zero currents

5. Interruption of DC currents, speed of breaking, switching over-voltage

6. Interruption of AC currents at current zero

7. Recovery voltage, three-phase short-circuit switching. Short-line faults

8. Small inductive currents, current chopping, over-voltage

9. Capacitive currents, switching over-voltage

10. Switching capability. Network switching conditions

11. Oil circuit breakers, air-blast circuit breakers

12. SF6 circuit breakers

13. Vacuum circuit breakers, air-break circuit breakers

14. Special switching systems

Syllabus of tutorials:

1. Introduction

2. Contactor combinations

3. Over-current relais

4. Characteristics of AC electromagnets

5. V-A characteristics of contactors

6. Calculating and simulation of electromagnet characteristics

7. Simulation electromagnet characteristics

8. Control test

9. Characteristics of contacts

10. AC electromagnet in DC systems

11. Protection circuit breakers

12. Overheating in contactors

13. Recovery voltage, modeling

14. Recovery voltage, modeling. Assessement

Study Objective:

Study materials:

Literature will be specified by the lecturer

Note:

Further information:

No time-table has been prepared for this course

The course is a part of the following study plans: