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Analysis of the methods for determining losses in the transformer magnetic core
https://doi.org/10.32446/0368-1025it.2022-1-52-57
Abstract
Exact separation of total losses in the magnetic cores of electrical machines into hysteresis and eddy current is a serious technical problem, the solution of which is urgently needed to effectively minimise magnetic losses and, therefore, to increase the efficiency of machines, in particular transformers. To solve this problem, the author proposes the wattmeter method, which can be used in three variants. Each of the variants has its own characteristics. This uses the results of two no-load experiments carried out under different conditions. The methods are based on the fact that eddy current and hysteresis losses depend differently on magnetisation frequency, magnetic flux and temperature. Based on measurements in the no-load experiments at two frequencies, two magnetic flux densities and two magnetic core temperatures, expressions for hysteresis and eddy current losses are obtained. The experimental results obtained by the different methods are consistent with each other. The advantages and difficulties of each method are analysed. It is shown that the combination of methods makes it possible to determine the degree of density index for the magnetic flux in the hysteresis loss power expression (Steinmetz factor) in a particular transformer.
About the Author
S. M. Plotnikov
Reshetnev Siberian State University of Science and Technology; Krasnoyarsk Institute of Railway Transport
Russian Federation
Russian Federation
Sergey M. Plotnikov
Krasnoyarsk
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Review
For citations:
Plotnikov S.M. Analysis of the methods for determining losses in the transformer magnetic core. Izmeritel`naya Tekhnika. 2022;(1):52-57. (In Russ.) https://doi.org/10.32446/0368-1025it.2022-1-52-57
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