Calculation of power losses in feeders 0,4 Kv with incorrect information about the load current dynamic management model of innovations generations

Abstract

The non sinusoidal currents, which is caused by the increase in the percentage of electric energy consumers with nonlinear volt-ampere characteristic, has an increasing influence on the amount of losses. The different currents amplitude and the degree of distortion in phases are also the significant factors. Existing methods for calculating power losses either take into account only the Effective current values(the generally accepted practice in Russia) or take into account the sinusoidal distortion of the shape of the current curve (IEEE Std1459-2010, IEEE Std 519–2014). In this paper, the cases of incorrect description of the load current are described and the effect of distortion of the curve's shape of the flowing current on the amount of power losses in a three-phase four-wire transmission line with a voltage of 0.4 kV is investigated. It is shown that the amount of electric power losses at an incorrectly specified load can exceed the amount of electric power losses of a sinusoidal case by several times.