38 research outputs found
Diagnostics of pumping units of pumping station of machine water lifting
No full textThe purpose of diagnostics is to determine the operability of the pumping units of the pumping station of the machine water lifting at a given time and to identify defects in their components. For this reason, the article presents diagnostic issues for pumping stations No. 1 - No. 6 of the Karshi main canal, designed and commissioned in 1965-1976, where 6 pumping units of the OPV11-260EG type with electric motors of the VDS-375/130-24 type are installed, vertical pumping units, shaft power – 8010 kW, rated power electric motor – 12500 kW, voltage – 10.0 kV, stator current – 825.0 A, maximum permissible temperature of the stator winding – 120 OC, bearing temperature – no more than 70 OC. Diagnostics of the main equipment involves the prompt detection of malfunctions as a result of processing sensor readings of the standard monitoring system, sensor readings are entered manually once a day, and data from monthly and special tests. Technological algorithms of vibration and thermal diagnostics are similar to those developed for vertical pumps installed at thermal power plants, the processes being diagnosed in which are similar to the processes occurring in pumping units of a pumping station. Taking into account the above tasks, algorithms have been developed for diagnosing the main components whose condition affects the performance of the pumping unit: the upper bearing, the upper crosspiece, the stator winding and core, the upper and lower guide bearings, and the electric motor bearing. Possible malfunctions of pumping unit components and ways to eliminate them are given
Analysis of the safety of pumping units of pumping stations of machine water lifting in the function of reliability indicators
No full textThe article presents ways of analyzing the safety of pumping units of pumping stations of machine water lifting in the function of reliability indicators, taking into account the complexity of analyzing the safety of pumping stations of machine water lifting and presenting the pumping unit of a pumping station as a "system", as well as taking into account the need to attract information about their functional scheme, information about the reliability indicators of the elements included in these schemes, information about the adopted system of maintenance and repair, as well as the criteria for the failure of such systems, structural schemes for calculating the reliability of the pumping unit have been developed. The developed structural scheme for calculating the reliability of a pumping unit is presented, consisting of an electric motor, a pump, a power supply network, a control device, a converter, a machine exciter or a semiconductor excitation system, a winding, active steel, an excitation winding, a collector-brush apparatus, a bearing, guide bearings, an oil cooler, an air cooler of an electric motor, a working ring, guide bearings, system lubrication of pump bearings. Structural diagrams are also given for four variants of the design layout of pumping units: each pumping unit supplies water to its pipeline; several pumping units operate in one common pressure pipeline; the main and backup pumping units are connected in series; pumping units are connected to a common pressure pipeline in series-parallel. Based on these structural schemes, formulas for determining the probability of trouble-free operation of the pumping unit and pumping units, considering their structural layout, are compiled. The article assumes that the uptime of the synchronous motor of the pumping unit is distributed exponentially, and the law of the repair time distribution corresponds to the gamma distribution
Algorithm and Software Implementation of the Diagnostic System for the Technical Condition of Powerful Units
No full textThis article discusses the software implementation of the diagnostic system for auxiliary equipment of power plants (on the example of smoke exhausters). The developed program of diagnostics of auxiliary equipment of electric power plants is given on the example of condition diagnostics designed for early detection and localization of certain defects and providing recommendations for their elimination in smoke pumps, which should ensure the issuance of appropriate protocols and, upon request, protocols of the current state of smoke pumps, quality assessment of repairs and special tests, as well as graphs of retrospective parameter values for the time period selected by the user, where the users of the task - there are heads and deputy heads of workshops, senior foremen, repair engineers, as well as specialists of the planning and technical department. The problem is considered, which was solved within the framework of the software and hardware complex of the automated process control system) of the 800 MW power unit No.1 of Talimarjan TPP and is intended for operational specialists, where the task operates under the Windows operating system and the program is written in the C++ programming language Builder 6 for the development of application tasks with client -server architecture. And also the composition of the program and the program menu are given: “Task Launch”, “Daily statements”, “Input data”, “Output forms”, “Diagnostics” and “Special tests” allow you to implement the required task function at the moment. In addition, the article presents elements and components, processes and conditions of a pumping plant, pumping station and pumping station cascade, potentially dangerous and processes and conditions potentially dangerous for a pumping plant, pumping station and pumping station cascade
Improvement of the cooling system of reactive power compensating devices used in railway power supply
Get PDFThis article analyzes the reactive power generation and compensation solutions in the "Uzbekistan Railways" electrical supply system operating at 25kV, 50Hz frequency. It examines the efficiency and economic analysis of the cooling system connected to the control components (thyristors) of the device compensating reactive power under various operating conditions. The study compares the conventional cooling system approach with the newly researched cooling system for the controlling components of reactive power compensation. It proposes specific systematic solutions regarding the electric locomotive's load current, environmental conditions, reliability of the cooling system, maintenance capabilities of the cooling system, and real-time monitoring and control analysis delivery to the service provider. Additionally, conclusions are drawn regarding the economic and energy efficiency
Improvement of the cooling system of reactive power compensating devices used in railway power supply
No full textThis article analyzes the reactive power generation and compensation solutions in the "Uzbekistan Railways" electrical supply system operating at 25kV, 50Hz frequency. It examines the efficiency and economic analysis of the cooling system connected to the control components (thyristors) of the device compensating reactive power under various operating conditions. The study compares the conventional cooling system approach with the newly researched cooling system for the controlling components of reactive power compensation. It proposes specific systematic solutions regarding the electric locomotive's load current, environmental conditions, reliability of the cooling system, maintenance capabilities of the cooling system, and real-time monitoring and control analysis delivery to the service provider. Additionally, conclusions are drawn regarding the economic and energy efficiency
Modern state of the energy sector of Uzbekistan and issues of their development
No full textThe data on the current state of the energy sector in Uzbekistan are presented. The need to diversify the structure of the republic’s energy balance is shown to ensure the energy security of the state in the medium and long term. The development of the energy sector is extremely important for ensuring sustainable economic growth and solving social problems of the state; as well as the development and modernization of the electrical system, the oil and gas sector, the construction of a nuclear power plant and a gradual transition to renewable energy sources are strategic directions for the development of the fuel and energy complex of Uzbekistan. It is argued that the construction of a nuclear power plant in Uzbekistan is not only advisable, but also necessary. The issues of the prospects for the development of renewable and nuclear energy sources in Uzbekistan, issues of investment and system costs with different shares of their participation in electricity generation are considered. It has been developed and shown that in the future, based on the symbiosis of renewable nuclear energy, by the middle of the 21st century, conditions for carbon-neutral energy can be formed in the economy of Uzbekistan
Analysis and ways of reducing electricity losses in the electric power systems of industrial enterprises
Get PDFAs a result of the analysis, ways to reduce electricity losses in the system of its production, distribution, transmission and consumption in industrial enterprises have been identified. The problem of recompense of jet capacity always occupied the important Place in the general complex problems of increasing transfer efficiency, distribution and consumption of electric energy. The correct decision such problems appreciably predetermines economy monetary and material resources, electrical supply improvement of quality. The main recompense problems of jet capacity should be considered with the account of modern views and taking into account new technical decisions in this area. The analysis of electricity losses in the Republic and increasing their energy efficiency while optimizing the consumption of reactive power is made. Recommendations have been developed to reduce losses on the line and in-plant losses of electricity
Improvement of the multifilament wire lager for cable production
Get PDFThe article discusses a possible way to solve the urgent problem of cable production - increasing the efficiency of the technological process by modernizing the control system of technological equipment by developing an intelligent system that allows to improve the reliability of the technology as a whole. The stranding equipment for the implementation of the stranding technology has been chosen as the object of the study, namely, a multifilament wire lager. This equipment is used in the production process of manufacturing cable and wire products, in particular the production of cable semi-finished products – strands. The work done on the modernization of the multifilament wire lager due to the introduction of the intelligent control system has resulted in outputs that provide high flexibility of the technology, which shall meet modern quality requirements of finished cable products
Power Losses of Asynchronous Generators Based on Renewable Energy Sources
No full textThis article discusses the possibility of using asynchronous generators in wind turbines, in particular asynchronous generators with phase rotors, in parallel with the network. Currently, due to the decrease in non-renewable energy sources around the world, the use of renewable energy sources, especially wind energy, is being considered. Also in this article, the power losses and energy balance of asynchronous generators with a phase rotor, all losses in an asynchronous generator, its efficiency, and torque are considered. In addition, a functional diagram of an asynchronous generator in a wind turbine has been developed, as have methods for simplifying calculations due to the generator substitution scheme. Due to this, methods for calculating the impedance of an asynchronous generator are given. With the help of an experimental research stand, the state of a number of parameters was analyzed during the parallel operation of an asynchronous generator with a phase rotor and a network. Taking into account that the indicators of the wind potential of land plots identified for the construction of wind turbines in Uzbekistan are higher than the average indicators of existing wind turbines in the world, it is assumed that the use of asynchronous generators in wind farms in the near future is considered promising
