Open AccessAdvanced method for determining the steady temperature and constant heating time of electric apparatus
Author(s) -
Е. И. Байда,
Oleksandr Chepeliuk
Publication year - 2021
Publication title -
vestnik nacionalʹnogo tehničeskogo universiteta "hpi". problemy soveršenstvovaniâ èlektričeskih mašin i apparatov
Language(s) - English
Resource type - Journals
eISSN - 2411-0604
pISSN - 2079-3944
DOI - 10.20998/2079-3944.2021.1.02
Subject(s) - constant (computer programming) , time constant , temperature measurement , electric heating , derivative (finance) , steady state (chemistry) , time derivative , electromagnetic coil , mechanics , control theory (sociology) , materials science , thermodynamics , mathematics , mathematical analysis , chemistry , computer science , electrical engineering , engineering , physics , composite material , control (management) , artificial intelligence , financial economics , economics , programming language
The article proposes an improvement in the method for determining the steady-state heating temperature of current-carrying parts of an electrical apparatus and its time constant in the case of real measurements of temperature values made with some error. In accordance with the specified method, at a known ambient temperature, the apparatus is turned on with the measurement of its heating temperature at regular intervals; based on the measurement data, a graph of the temperature derivative is plotted over time; according to the data of the graph, the steady-state temperature and the constant heating time are determined. It is shown that inaccuracies in temperature measurement can significantly distort the dependences obtained for determining the time constant and the steady-state heating temperature, and for a correct estimation of the parameters, the form of the approximating function of the temperature derivative with respect to time must be known a priori - a linear function. This method can significantly reduce the time for testing electrical devices for heating in continuous operation. This method is illustrated by the example of determining the heating of the coil over time by measuring the active resistance. On the basis of the obtained and processed experimental data, the power overload coefficients are also determined in the long-term operation mode, as well as in the short-term and intermittent modes, which makes it possible to correctly operate the electrical apparatus.