There are currently no thermal self-diagnostics systems of instrument transformers operating in real time, as opposed to power ones, and thermal inspections are often carried out according to a maintenance schedule, which affects the reliability of electrical equipment. Therefore, an important task is to create such systems for digital instrument combined current and voltage transformers based on resistive dividers, which determine temperature values at several points, including the most heated element. The aim of this study is to obtain experimental data on the thermal state of a resistive divider exposed to environmental factors and voltage for developing a self-diagnostics system. The results are obtained by physical simulation of thermal conditions of the transformer and its elements in high- and low-voltage climatic chambers. The effects of the following factors of critical importance have been simulated: electric voltage, insolation, temperature and speed of the ambient air. Data processing was performed using the methods of probability theory and mathematical statistics. The time needed for the thermodynamic system to move to a steady heat exchange mode, and also the temperatures on the lower resistors and on the surface of the voltage transformer insulation cover have been determined. It has been established that thermal conditions are more significantly affected by the simulated voltage than by insolation. The study has shown that even in the most severe emergency operating modes, heating in the lower resistor does not exceed the critical value. It has been found that the thermal state of the transformer is significantly influenced by the simulated factors including directional insolation, which is not taken into account in the existing methods of calculating the thermal state of the instrument electrical equipment. The reliability of the obtained results is ensured by the fact that the simulation took into account significant factors. The results of the experiment will be used to develop a thermal self-diagnostics system for the digital transformer, which will improve the reliability of operation of such instrument equipment by allowing the personnel’s to give a rapid response to real-time information about the transformer thermal state.

One of the effective ways to intensify heat exchange processes in the bulk tank is organization of gas filtration through the tank. However, it is necessary to compare the positive effect obtained by reducing the heating time and, hence, the required amount of heat input with the resistance of the bulk tank, which affects the choice of equipment. The existing formulas for determining tank layer resistance, as a rule, have a limited application range due to a number of structural parameteres. Thus, obtaining the value of the aerodynamic resistance of bulk tanks of different structures is an important task for determining the amount of energy consumed for the organization of the filtration process. The work employed the data obtained in the experimental study of fluid filtration through a porous medium in the range of porosity values. The method of nonlinear regression analysis was used to approximate the desired dependence. Based on the data on the resistance of bulk tanks of different porosity obtained in the experimental study, the authors have derived an empirical polynomial dependence of the resistance of bulk tanks on the fluid mass flow rate and porosity. This equation can be applied for the filtration rate values from 2 to 8 m/s and porosity values from 0,345 to 0,888 regardless of the structural parameters of the bulk tank layer. The authors carried out mathematical modeling of the air filtration process through the tank by replacing the real structure with a fractal-like model. The obtained results allow optimizing the operating parameters of the equipment in thermal heating furnaces, and the presented dependence can be used to determine the aerodynamic resistance of bulk tanks, affecting the choice of traction equipment in the reconstruction of furnaces. The accuracy of the obtained results is determined by the experiment error, which does not exceed 7 %.

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and Automation]. Sochi, 2015.

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Авторское резюмеСостояние вопроса.В рамках методологии матричной формализации разработаны модели для расчета практически всего оборудования ТЭС, кроме турбоустановки -собственно турбоагрегата и системы регенеративного подогрева питательной воды.Разработка в рамках единой методологии математической модели турбоустановки позволит создать замкнутое математическое описание всей тепловой схемы ТЭС, что, в свою очередь, обеспечит возможность более обоснованного определения энергетических характеристик оборудования, создания компьютерных тренажеров и программных средств оптимизации режимов технологических систем и подсистем ТЭС

Авторское резюмеСостояние вопроса: В целях решения проблемы снижения выбросов окcидов углерода в атмосферу от энергетического сектора за рубежом большое внимание уделяется разработкам замкнутых термодинамических циклов с кислородным сжиганием топлива.Наиболее перспективным с точки зрения внедрения признан термодинами

 ФГБОУВО «Ивановский государственный энергетический университет имени В

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