10.26731/1813-9108.2017.4(56).207-217
The economic damage from the lowered quality of the electric power includes technological and electromagnetic components. The first one is due to the fact that the lowered quality can lead to violation of complex technological processes, decline in the quality of products, reduction of the productivity of working mechanisms. The electromagnetic component is defined by increase of losses of the electric power, decrease in reliability of power supply and reduction of reliability of the accounting of the electric power. Therefore, the problem of quantitative definition of influence of indicators of quality on energy efficiency of systems of power supply has an undoubted relevance.
Results of the computer modeling aimed to define the influence of asymmetry of tension of the three-phase system on a size of losses of power in electric network are presented in article.
The analysis of the negative effects caused by distortions of quality of the electric power is provided. Unlike many works in which such analysis was made on the basis of the simplified analytical ratios, the authors used the more adequate approach based on the modeling of the asymmetrical modes in phase coordinates.
It is shown that the size of additional losses depends on a way of creating asymmetry and a mode of the loading node. With the external asymmetry created by resistive loading, dependence of losses on asymmetry coefficient on the return sequence is close to linear. If the asymmetry is created by various loadings on phases, then this dependence becomes close to square one.
Additional losses in the transformer at big levels of asymmetry can reach 15 … 20% of the size of rated losses in copper.
The additional losses are inversely proportional to tension of short circuit of the transformer.
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