This article is devoted to solving the critical task of improving the reliability of the power systems for agricultural processing plants. The article’s material is exploratory in nature, reflected in the fact that the proposed mathematical models for the analysis of groups of high-voltage induction motors will allow to investigate various modes of symmetric groups of asynchronous motors more effectively. We present the analysis of the existing mathematical models of induction motors considering the design features of such machines that directly affect the dependence of resistance and inductance on the rotor current frequency. The assumptions taken into consideration to obtain a more accurate mathematical model of the induction motor are also formulated. The article provides a comparison of different reference frames used in the mathematical modeling of asynchronous motors. It is proved that the use of the generalized coordinate vector for mathematical modeling of asynchronous motors is the most optimal approach. The equivalent circuit of asynchronous deep-bar motor in generalized vector coordinates derived in the work is used for analysis of transient behavior as well as the steady state operation. The results of the study are suitable for transient analysis of electrical power supply systems of agricultural enterprises with large number of high-power electric motors, for example, CHP of sugar processing plants and grain elevators
There are two different complete sets of replaceable gears bracket of metal-cutting machine tools in the article. One is delivered together with the 5К32 machine tool, another is received on the basis of work of the author. The samples made of these complete sets, are checked by the plate-measuring machine. Diagram of measurements and comparative tables are presented
n the article we have presented the results of the influence of ultrasonic processing on quality of model meat systems. We have also determined optimum parameters of ultrasonic processing
The article presents a simulation mathematical model of technical and technological systems for heating livestock complex, which establishes the relationship between the structural and technological parameters of the technical and technological system and the parameters characterizing the efficiency of their operation in the process of heat transfer at the heat supply of the livestock sector
The article presents the results of studies of dynamic phenomena caused by the process of cutting band saw and clarified the zones in which resonance occurs, which negatively affects the overall bandsaw
The efficiency of an ultra-low-volume spraying (ULV) of field crops was substantiated; we have also presented high performance complex machines
In the given article a model which allows defining general characteristics of covert channels in packet-switched networks as well as countermeasures to covert channels developed on the basis of the model in question are presented
The article shows the test procedure and the value of the overvoltage in fault-free phases achieved dependencies on the moment of a one-time single-phase ground fault at the 35 kV voltage with an insulted neutral
The article discusses the relevance of the development of a mathematical model of threats and an intruder model which has been expressed in formalization of the process of finding vulnerabilities in information systems data at all stages of interaction between users and web-based applications, starting from user authentication procedures
The feasibility study is required in determining the effectiveness of the implementation of electrotechnical products. The main aim is to determine the magnitude of the economic effects of using key and related results in agriculture. The article presents a feasibility study of production and implementation electroactivator device in the production of 5 units monthly, 60 units per year. It is the device cost calculation based on investment, energy costs and wages. Capital investment in new plant is the cost of materials and installation. The magnitude of the value of individual elements of the unit is determined by the price lists. Determining the cost-effectiveness and technical feasibility in the production when introducing electrified units involves additional investment and operating costs, this is reflected in the cost of production. The comparison was made for the device with a new electroactivator developed in KubSAU and using chemical means of Lakmus. Calculations of economic efficiency of investments for the farm which has 225 hectares of arable land have shown that basic income will be obtained by reducing operating costs. Net present value was determined for different levels of the bank rate and inflation