Electric Machinery and Apparatus 1

Vztahy:

In order to register for the course BE5B14SP1, the student must have registered for the required number of courses in the group BEZBM no later than in the same semester.

Garant předmětu:

Lecturer:

Tutor:

Supervisor:

Department of Electric Drives and Traction

Synopsis:

Electric drive and its components. Electromechanical energy conversion. Rotational converters - DC machines, induction motors, synchronous generators and motors. Special electric machines, actuators. Static converters - transformers. There are presented operational principles, main constructional scheme and characteristics, applications. Switching theory. Interaction between turn-off switch and switched circuit. Basic theory and characteristic of electric arc. Transient recovery voltage. Switching overvoltage. Low voltage protection apparatuses

Requirements:

Active participation on laboratory measurement, document administration in due form, measure result processing, submit of test reports

Syllabus of lectures:

1.Electric drive and its components. Electromechanical energy conversion. Electrotechnical laws application

2.DC machines, principles, design, main characteristics. Generators and motors

3.Starting and braking of motors. Common DC machine characteristics, commutation principles

4.Transformers, principles and design, main characteristics. Three-phase transformer winding accouplement

5.Main work states, parallel operation. AC rotating electromechanical converters, rotating magnetic field

6.Induction machines, principles, use, characteristics. Single-phase induction motor

7.Energetic electric machines. Synchronous generators. Synchronous motors, principles, constructional design

8.Introduction to switching problems. Switching apparatus operational principles. Switching arc in circuit breakers

9.DC current interrupting, Influence of circuit induction and disconnecting speed on switching over-voltage

10.AC current interrupting. Influence of an arc voltage, breaking current deformation

11.Transient recovery voltage (TRV). Influence of TRV on the switching process

12.Switching over-voltage in AC circuits. Small inductive current- and capacitive current breaking

13.Circuits breakers for low voltage circuits, characteristics and application rules

14.Protecting apparatuses - residual current circuit breakers, over-voltage arresters

Syllabus of tutorials:

1.Introduce to labs, security laws, laboratory rule, adjustable sources and their control

2.Starting and reversation of DC motors. Torque- and speed measurement. Tachodynamo calibration

3.Independent excited motor - load characteristics

4.Speed control of independent excited DC motor

5.Transformer - no load and short circuit operation measurement, standby circuit

6. Induction motor - starting, mechanical characteristics

7.Synchronous generator - synchronizing with the network, operation on the network

8.Contactor combinations

9.Programmable relay in distributor boxes control - I

10.Programmable relay in distributor boxes control - II

11.Overcurrent relais, switching characteristics

12.Contactors V - C characteristics

13.Contactor current path overheating measurement

14.Reparation measurements, credit

Study Objective:

Study materials:

1.Chapman,S.J.: Electric Machinery Fundamentals, McGraw-Hill, 1985

2.Flurscheim, C.H., Power Circuit Breaker, Theory and Design. IEE.1982

Note:

Further information:

No time-table has been prepared for this course

The course is a part of the following study plans:

• Electrical Engineering and Computer Science (EECS) (compulsory elective course)
• Electrical Engineering and Computer Science (EECS) (compulsory elective course)