EVALUATION OF AFTER-EFFECT IN THE STREAMS OF POWER RECEIVERS USED IN ENTERPRISES

Abstract

All power equipment componemts of electrified facilities, ranging from internal wiring, protection, control, metering equipment to converter devices, are exposed to the influences of the flows of switching-on and -off of electrical receivers (ER). These flows are the basis for the formation of electrical loads. The authors point out the notable similarity of the fluxes of ER inclusions with the known fluxes of events described in the theory of probability. It is shown that flows of ER inclusions feture stationarity, ordinariness and the absence of after-effect, due to which these flows can be considered the simplest ones. The registrams of electrical loads obtained with the help of recording ammeters were processed using the methods of probability theory and mathematical statistics. The flows of switching-on and -off of electric drives at the inputs of electrified objects and group distribution cabinets were analyzed in order to clarify the formation patterns of electrical loads. The authors considered flows of homogeneous events that differed only in the moments of their occurrence. Their paper contains experimental data that confirm the exponential distribution of time intervals between the moments of switching on the electric drive. It is proposed to estimate the degree of after-effect in the flows of ER switching-on using normalized Ehrlang flows. A quantitative assessment of the after-effect in the flows of ER switching-on makes it possible to distinguish these flows when analyzing their possible influences on the operation of the electrical equipment used in enterprises.