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Active power losses in three-phase cable power lines

Otcenasova Alena, Bolf Andrej, Altus Juraj, Regula Nichal

Przegląd Elektrotechniczny

2020

R. 96, nr 2

200--208

This paper deals with the power quality in a distribution grid. It is aimed to analyze active power losses that arises in the distribution grid of 22 kV. The active power losses are influenced by various adverse effects such as the load voltage unbalance, the load power factor, and the higher harmonics. The influence of these adverse effects was analyzed by the simulation model that was created in the simulation program Matlab – Simulink. The simulation was performed for three types of power line cable conductors, their different lengths, different types of active power consumption and different values of adverse effects that are mentioned above. Pursuant to data, obtained from the real measurement on an existing part of the distribution grid, another simulation was performed. Based on the individual analyzes of the real measurement, the financial losses during a certain period were calculated.

W artykule analizowano straty mocy czynnej w sieci rozdzielczej 22 kV. Analizowano nierównowagę napięć obciążenia, współczynnik mocy I obecność harmonicznych. Przeprowadzono symulację dla trzech typów linii kablowych o różnej długości I różnych poborów mocy. Inalizowano też koszty.

Influence of unbalance of loads in quality of electric enegry in a low voltage line

Kolber P.

Journal of Polish CIMAC

2010

Vol. 5, no 3

55-62

The paper presents results of investigations of deviations of voltage from rated value (äU) and the voltage unbalance coefficient (áU2) at the rural consumers’ sites supplied from the final section of a low voltage line under the load asymmetry conditions. Those parameters are one basic parameters describing quality of electric energy. A probabilistic model of the distinguished parameters, taking into account load unbalance, was built in scope of the investigations. A simulation programme enabling to determine voltage deviation and the voltage unbalance coefficient, among other things, for various variants of the cable cross-sections applied and various variants concerning the types of the consumers connected was elaborated on the basis of the model built; two essential types were distinguished here: living and production consumers characterised by different power consumption rate. The calculations were performed for a three-phase, four-cable airborne power line with flat arrangement of cables.