Course code ETeh4048

Credit points 3

Total Hours in Course81

Number of hours for lectures8

Number of hours for seminars and practical classes16

Number of hours for laboratory classes8

Independent study hours49

Date of course confirmation06.01.2015

Responsible UnitInstitute of Engineering and Energetics

Inženiertehnikas un enerģētikas institūts
## Ainārs Galiņš

Dr. sc. ing.

ETeh4037, Fundamentals of Electrical Engineering I

Fizi2032, Physics I

Fizi2033, Physics II

Mate1029, Mathematics I

Mate1030, Mathematics II

Mate2034, Mathematics III

Mate2035, Mathematics IV

The aim of the course is to learn the calculations of AC circuits, knowledge of magnetically coupled coils, inductance M, transformer, three-phase current physical nature, three-phase circuitry - star-star with "0" wire, star-star without "0" wire, triangle circuit and calculation methods, low-phase mode calculations. Nonlinear AC circuits and physical phenomena in nonlinear circuits, transition processes in linear electric circuits, their calculations, switching laws, electrical circuits, inductances, electric filters, electrical lines, processes in lines are considered.

Knowledge - the theoretical foundations of electrical engineering and theory of electric circuit calculation, is understanding of physical processes in electrical circuits - control works, laboratory works;

Skills - to perform calculations of electrical circuits - tests;

Competence - to calculate electrical circuit parameters and evaluate their performance - tests.

**Full time intramural studies:**

1. Calculations of Sinusoidal AC Circuits for Circuit Breaking (Lecture - 1h).

Test 1: Calculations of a series circuit (Practical work - 1h).

2. Calculations of alternating current circuits for parallel circuit (Lecture - 1h).

Test 2: Calculations of parallel circuit (Practical work - 1h).

3. Calculations of AC circuits for mixed circuit in symbolic form with complex numbers (Practical work - 2h).

Test 3: Mixed circuit calculations (Practical work - 1h).

4. Magnetically coupled coils. Transformer vector diagram (Lecture - 1h).

5. Multiphase systems. Three-phase current, system, circuits, power (Lecture - 1h).

6. Three-star system star-star with "0" wire (Practical work - 1h).

Test 4: Closing star-star with "0" wire calculation (Practical work - 1h).

7. Delta connection in a three-phase system (Practical work - 1h).

Test 5: Calculation of the delta connection (Practical work - 1h).

8. Three-star system star-star without "0" lead (Practical work - 1h).

Test 6: Closing star-star without "0" lead calculation (Practical work - 2h).

9. Symmetric three-phase load. Non-asymmetric three-phase load (Practical work - 1h).

10. Method of symmetric components in the calculation of three-phase circuits (Lecture - 1h).

11. Non-phase mode calculations (Practical work - 1h).

12. Nonlinear AC Circuits. Energy loss. Physical phenomena in nonlinear circuits (Lecture - 1h).

13. Transition processes, switching laws, their application (Lecture - 1h).

14. Calculation of Transition Processes. Overvoltages in electrical circuits (Practical work - 1h).

15. Electric filters. Electrical processes in lines. (Lecture - 1h).

16. Summary of the work done (Practical work - 1h).

Laboratory Works:

1. Circuit-switched AC circuit -1h.

2. Improving the power factor -1h.

3. AC circuit with parallel branches -2h.

4. Investigation of a single-phase transformer -1h.

5. Three-phase consumer in star-conection -2h.

6. Transition processes in DC circuits -1h.
**Part time extramural studies:**

All topics specified for full time studies are accomplished, but the number of contact hours is one half of the number specified in the calendar

Oral exam.

The exam consists of three theoretical questions and a practical calculation exercise and a discussion of what has been done.

All tests, laboratory works and independent assignments must be counted.

Pre-test homework (control type - test):

1. Calculations of a single-phase sinusoidal current circuit;

2. Parallel circuit calculations;

3. Single-phase sinusoidal current mixed circuit calculations;

4. Three-phase star-star with "0" wire calculation;

5. Calculation of the three-phase delta circuit;

6. Three-phase star-star without "0" wire calculation;

7. Calculation of symmetric three-phase load.

Quality of work performance. Understanding what you have done. Ability to logically justify processes and explain the causes of errors. Ability to discuss what you have learned.

1. A. Galiņš. Elektrozinību teorētiskie pamati. Elektrisko ķēžu aprēķini. Mācību metodiskais līdzeklis. Jelgava, LLU, 2008. 120 lpp.

2. Elektrotehnikas teorētiskie pamati: Stacionāri procesi lineārajās ķēdēs. Briedis J., Dūmiņš I., Lasis U.u.c.; K. Tabaka red. Rīga: Zvaigzne, 1999. 300. lpp.

1. Franco S. Electric circuits fundamentals. International edition. Saunders College Publishing 1995. 882 p.

2. Nahvi R., Sonderstand M. Student problems manual for electric circuits fundamentals. Saunders College Publishing, 1995. 578 p.

3. Dorf R.C. Introduction to electric circuits. 2nd edition. New York. John Wiley & Sons, Inc. 1993. 872 p.

Compulsory course in full-time and part-time studies of professional higher education bachelor study program "Applied Energy Engineering"