Electrical Engineering

Total Hours in Course81

Number of hours for lectures8

Number of hours for seminars and practical classes8

Number of hours for laboratory classes16

Independent study hours49

Date of course confirmation16.03.2021

Responsible UnitInstitute of Engineering and Energetics

Course developer

lect.

Imants Plūme

Mg. sc. ing.

Course abstract

Students get acquainted with the concepts of electric and magnetic fields, calculation methods of direct current and alternating current electrical circuits, the principles of operation and application of various electrical devices. Students acquire knowledge about the principle and structure of transformers, electric motors, heating equipment and lighting and other equipment. Laboratory work includes the connection of various electrical devices, such as luminaires, electric motors and transformers, to the power supply, measurement, adjustment and functional testing.

Learning outcomes and their assessment

Knows the general characteristics of electric and magnetic fields and methods of engineering analysis of electrical circuits. Evaluates the completed tests (2 pieces) and knowledge in defending of laboratory works (2 works).

Is able to perform calculations of DC and AC circuits and is able to practically create DC and AC circuit connections and perform measurements of circuit parameters. Evaluates the completed tests (2 test) and knowledge in defending of laboratory works (2 works).

Knows the selection of various electrical devices, including electric motors, transformers, lighting devices and protection devices for a specific application and the determination of their operating parameters. Evaluates completed homework (2 homeworks) and knowledge in defending of laboratory works (4 works).

Assessment: test with a mark.

Assessment: knowledge, skills and competence are assessed with 4 tests, 2 home works and with defending of laboratory works.

Course Content(Calendar)

1.Basic concepts of DC circuits, Ohm's law, circuit operation modes, current work and power, lecture - 1 h.
2.Calculation methods of DC circuits, Kirhof's laws, pract. work - 1 h, test 1.

Laboratory works. Consumer triangle and star connection - 2 h.

1.Heat effect of electric current, melts. fuses, wire cross sect. calculation, lecture - 1 h.
2.Calculation of branched circuits with methods of circuits and node voltages, pract. work – 1 h Laboratory works. Determination of transformer parameters - 2 h.
3.Acquisition of sinusoidal alternating current, sinusoidal quantities, their effective values and display methods, lecture - 1 h.
4.Nonlinear elements of electric circuit, their application, pract. work - 1 h. Laboratory works. Determination of parameters of lighting devices - 2 h.

Laboratory works. Metering of electric energy, electricity meter connections - 2 h.

1.Basic values of magnetic field, law of full current, calculation of magnetic circuits, lecture - 1 h,
2.Sinusoidal AC circuits with series of closed R, L, C elements, circuit calculation, prakt. work - 1 h, 3rd test.

Laboratory work. Electric motor start and reverse - 2 h.

1.AC circuits with parallel closed R, L, C elements, current resonance, power factor improvement,, lecture - 1 h, laboratory. work - 1 h.
2.Calculation of branched AC circuits, pract. work - 1 h, 4th test.

Laboratory works. Single-phase electric motor connection in three-phase network - 2 h.

1.Three-phase power circuits, three-phase consumer stars and triangle circuit, lecture - 1 h.
2.Transformer structure, operating principle, power losses and efficiency, pract. work - 1 h.

Laboratory works. Improvement of electric motor power factor - 2 h.

1,Operating principle and operating parameters of asynchronous motors, lecture - 1 h.
2.Calculation of protection elements of lighting devices and electric motors, [individual work 1]. Laboratory work. Improvement of the power factor of lighting devices - 2 h.
3.Electrical power factor for electrical circuit, calculation of parameters for its improvement, lecture - 1 h [individual work 2].
4.Types of electric drive machines, start-up, speed regulation and application pract. work - 1 h, Laboratory work. Improvement of power factor of transformers and other electrical devices - 2 h.

Requirements for awarding credit points

Must have performed and credited all laboratory, independent works and passed all quizzes.

Description of the organization and tasks of students’ independent work

Students are guided by the requirements provided in lectures and laboratory works in the development of homeworks and in elaboration of laboratory works, and by using the recommended literature.

Homework 1. Calculation and selection of protection devices for electrical equipment.

Homework 2. Improving the load factor for end-user circuit.

Criteria for Evaluating Learning Outcomes

The student is able to prove the acquired knowledge and skills on calculation methods of electrical circuits, the principles of operation and application of various electrical devices. Criteria for assessment are 4 tests (30%), 2 home works (30%) and laboratory works (40%) and the level of acquired knowledge. The total grade of course is the test with a mark (100%).

Compulsory reading

1.Grunte U., Makreckis O. un Zacmanis V. Lietotāju un speciālo elektroietaišu ekspluatācija. Mācību palīglīdzeklis. RVT, 2012. 107 lpp. http://www.rvt.lv/GRAMATAS/Energjetikju_gramatas/17.1ISBNgramata.pdf, skatīts 14.10.2020.
2.Nilsson, James W.;Riedel, Susan, Electric Circuits, Global Edition, Pearson Education, edition:11, 2019, eISBN: 9781292261065, p 819. skatīts 15.10.2020.
3.Прянишников A.B. Теоретические основы электротехники. Курс лекций. Учебник для высших и средних учебных заведений. Корона-Принт, 2016 г, 369 c.
https://www.labirint.ru/books/110596/, skatīts 17.10.2020.

Periodicals and other sources

1.Žurnāls Enerģija un pasaule, www.energijaunpasaule.lv , skatīts: 20.09.2020.
2.https://mcliepa.lv/macibu-materiali/Elektrotehnika%20un%20elektriskie%20merijumi/PamatkurssElektrotehnika.pdf, skatīts: 20.09.2020.

Notes

The study course is included in the VBF full-time professional higher education

education bachelor study program "Construction", part - time 2nd

level professional higher education study programs

"Construction" and 1st level professional higher education study

in the compulsory part of the "Construction" program

Atsauksmes