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To date, electrical power in a form of higher-order current harmonics and voltage are reported to be worsening substantially in power lines of industrial and non-commercial consumers. This fact relates to the change of power consumer types to use different household and industrial power receivers. Higher-order harmonic current components cause extra losses in transformers. As a consequence, electrical power delivery is less efficient and losses increase. Therefore, it is necessary to measure harmonic components of current and voltage in distribution networks. The paper presents a measuring tool of loss counter developed on the base of constant coefficients method. Performance and relative accuracy were studied experimentally using a variable-speed drive with the results reported in the paper. The developed measuring tool meets the standards of admitted relative accuracy and is applicable to implement conditionally constant coefficients method in order to calculate excessive losses to be caused by non-sinusoidal loads in transformers of distribution networks.

In this article, for the spectral expansion of periodic functions by means of a truncated segment of the Fourier series, the authors demonstrated options for their representation in the form of sets of coefficients and showed the relationship between the latter. On the basis of mathematical calculations, the authors have prepared an appropriate mechanism for organizing calculations, for which a number of linear matrix operations have been formed. The application of a new computing mechanism based on a discrete expansion of continuous periodic functions is demonstrated in detailing the problem of combinatorial optimization of the power distribution process, as well as the corresponding load model and target function.