Keyword: «higher harmonics»

The article presents the results of experimental studies to determine the time of use of the maximum load and the time of greatest losses for the most significant harmonics of the current by seasons. The measurements were performed on low-voltage inputs of 10/0.4 kV power transformers that supply mainly utility networks with a voltage of 0.38 kV. To obtain reliable results, 37 head sections of 0.38 kV networks were examined.

The article discusses issues related to the development of a model of an electrical receiving device of a 0.22 kV load node in the form of a replacement circuit represented by a linear part and a set of current sources of various frequencies, the parameters of which are described by statistical estimates obtained by the method of parametric identification. A computer has been selected as an electrical receiving device. The simulation results are presented. The resulting model can be used to create a computer model of a 0.22 kV load node.

Тhe article presents the results of a study of the effect of voltage on the parameters of a nonlinear electrical receiver. The subject of the study is relevant, as the parameters of electrical receivers are the initial data for modeling load nodes, which is performed in order to optimize the parameters of higher harmonic filters or their compensation devices. In the load nodes of a 0.38 kV distribution network with an asymmetric load, the voltage constantly changes. It is known that nonlinear electrical receivers have a nonlinear current-voltage characteristic, and the changing voltage will affect the parameters of the electrical receiver. The purpose of the study was to determine the extent of the influence of voltage changes on parameter estimates. Two laptops of well-known manufacturers are taken as objects of research. The article presents the results of the research.