**UDC 621.3**

**O. Kyrychenko ^{1}**, Candidate of Technical Sciences, Associate Professor

**I. Sidorika**, Candidate of Technical Sciences, Associate Professor

^{2}**D. Marchenko**, Candidate of Technical Sciences

^{1}^{1}Mykolayiv National Agrarian University

^{2}National Shipbuilding University named after. Admiral Makarov

Introduction. According to the state educational standards of Ukraine, the passage of laboratory practice in the discipline of electrical engineering and electronics basics involves the practical development of students’ experimental methods for studying electric circuits and consolidation of theoretical knowledge and skills, as well as familiarity with electrical measurements.

The error in determining of parameters and electric circuits operating modes by calculation and obtained experimentally differs in magnitude, which in some cases amounts to 10-15%. One of the reasons that affects the error magnitude is the heat emission in the electric circuit’s elements, which leads to an increase in the spread of their parameters, which was not taken into account before.

Research methodology. The methodology for studying the elements of the training and testing stand of the electrotechnical laboratory envisaged the creation of a geometric, finite-elemental and realistic 3D-resistor models.

Electrothermal analysis of the electrical laboratory training bench elements was carried out using numerical simulation.

Research results. The distribution of the main electric and thermal quantities by the volume of the electrical laboratory’seducational-research stand element is established.

As a result of the electrothermal analysis, different values of the resistor heating were obtained at a different magnitude of the current strength flowing through it, on the basis of which the resistor’s electrothermal characteristics were constructed. The resulting thermal model is adiabatic, and therefore the resulting numerical values for temperature should be considered as the upper thermal limit.

Conclusions. Conducting an electrothermal analysis of elements of the UNSS-1 training laboratory unit allowed to establish the distribution of the main electrical and thermal variables by the volume of the training laboratory stand element.

The influence of heat on the accuracy of calculations in determining the parameters and modes of operation of electric circuits by calculation and determined experimentally is determined. Taking into consideration thermal flux has increased the general accuracy of electric parameters calculations, since the error was not more than 5-7%.

**Keyword:** electrothermal analysis, educational and research stand, electrotechnical laboratory, modeling, temperature fi eld.

Ключевое название (Key title):

Vìsnik agrarnoï nauki Pričornomor'â (Online)

Сокращенное ключевое название (Abbreviated key title):

Vìsn. agrar. nauki Pričornomor'â (Online)

Параллельное название (Parallel title):

Ukrainian Black Sea region agrarian science