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Power Technology and Engineering
Journal Prestige (SJR): 0.204
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1570-145X - ISSN (Online) 1570-1468
Published by Springer-Verlag Homepage  [2570 journals]
  • Method of Calculating the Long-Term Permissible Current of Conductors with
           Cast Insulation
    • Abstract: The cast insulation of current conductors is made of epoxy resin having a low thermal conductivity, which worsens heat emission from the current-carrying busbar. A method is proposed for calculating the long-term permissible current for conductors with cast insulation with consideration of various locations indoors in electric power facilities or outdoors. The method is based on solving the heat balance equation. The results of the calculations are given for specific types of conductors and their analysis is performed.
      PubDate: 2019-12-02
       
  • Calculation of the Flow Depth on a Ledge at the Channel End
    • Abstract: The question of determining flow depth at the end of a ledge during free {flow into the atmosphere} was examined. The velocity-distribution law in the end cross-section of the channel is proposed. The results of depth calculation are compared.
      PubDate: 2019-12-02
       
  • Calculating the Crack Resistance of Fiber-Reinforced Concrete Lining of
           Free-Flow Water Tunnels Using Linear Fracture Mechanics
    • Abstract: The results of studying the crack resistance of fiber-reinforced concrete lining of circular free-flow water tunnels are presented. A method for calculating the crack resistance of such a lining using the finite-element method, factor analysis, and linear fracture mechanics is developed.
      PubDate: 2019-12-02
       
  • Experience of Designing and Constructing the Lower Bureya Earth-Fill Dam
           with an Impervious Diaphragm Made from Secant Bored Piles
    • Abstract: The design experience and construction stages of the Lower Bureya earth-fill run-of-river dam with an impervious diaphragm (“wall in trench”) made from secant bored piles are described. Recommendations for subsequent projects are formulated.
      PubDate: 2019-12-02
       
  • Numerical Analysis of the Protection of a Harbor Against Waves
    • Abstract: A method for evaluating the protection of a harbor against wind waves by numerical simulation is demonstrated for the Port of Ust-Luga as an example. For this purpose, the DHI MIKE 21 SW and BW models are used. Ageneral algorithm and a universal research plan are presented. The calculated wave characteristics are compared with their allowable values obtained from Russian regulations. Conclusions on the reliability of the numerical method used and the relevance of the data in the regulations are drawn.
      PubDate: 2019-12-02
       
  • Investigation of the State of an Earth Dam by Geophysical Methods
    • Abstract: Operational nondestructive monitoring is presently used actively for assessing the stability and predicting the physical state of earth dams. An investigation by several methods of such physical parameters as density, dielectric constant, electrical resistance, longitudinal electrical conductivity, and frequency dispersion coefficient was carried out on an earth dam located in the Sverdlovsk Oblast.
      PubDate: 2019-12-02
       
  • Use of Accumulation Basins to Reduce Silting of Reservoirs of
           Hydroelectric Power Plants Located on Mountain Rivers
    • Abstract: The effectiveness of the use of accumulation basins ordinarily used for river sediment to reduce the rate of silting of the reservoirs of hydroelectric power plants situated on mountain rivers is considered. The investigation is performed by methods of numerical hydrodynamic simulation based on the two-dimensional Saint-Venant equations and a new model of sediment transport that takes into account the fractional composition of the sediment. Using as an example a concrete reservoir located on a mountain river, it is shown that it is extraordinarily important to take into account the heterogeneity of the soil in the process of solving these types of problems. A combination of the annual hydraulic flushing of reservoirs and mechanical removal of soil from the accumulation basins together assure the required useful volume throughout the entire service life of the hydroelectric plant, though it requires the annual removal of up to 40% of the sediment discharge of the river.
      PubDate: 2019-12-02
       
  • Practical Implementation of Monitoring and Ice Melting on 110 – 120 kV
           Overhead Transmission Lines Based on the Dip Angle of the Wire
    • Abstract: The problem studied here is important because of the need for an efficient technology for monitoring the state of the wire in a span based on combined software and hardware for analyzing the technical state of the wires in 110 kV overhead electrical transmission lines in order to obtain a comprehensive estimate of the effect of external climatic factors owing to wind and ice loading, as well as the amount of thermal elongation of the wires owing to the effect of current flow. An analysis of the instantaneous state of the wires and their limiting mechanical strength makes it possible to evaluate the effectiveness of measures for preventing accidents and lessening the undersupply of electrical power to final consumers. Visualizing the instantaneous parameters of the wire in a span of an overhead electrical transmission line will make it possible to reduce the time needed to undertake steps to prevent emergencies. The algorithm for monitoring the state of wires in overhead lines is based on information about the existing values of the longitudinal and transverse angles obtained with sensors that are installed directly on the wire in an electrical transmission line.
      PubDate: 2019-12-02
       
  • Information Bases of Algorithms for Protecting a Generator Operating on
           Busbars from Single-Phase-to-Ground Faults. 1 Part III. Investigation of
           the Information Bases of Algorithms Controlling Higher Current Harmonics
    • Abstract: The information bases of algorithms for protecting the stator of a generator operating on busbars from single-phase-to-ground faults (SPGFs) are investigated. The information bases of algorithms in which the effective values of the components of zero-sequence higher current harmonics and differential currents are studied. It is shown that higher harmonics in the current of the SPGFs of the generator stator are divided into three groups, the harmonics of each of which have the property of individuality, manifesting itself in the original character of dependence of their level on the location of the SPGFs. The information content of harmonics of one group enrich the information value of other harmonic groups, increasing protection sensitivity and selectivity. It follows from an analysis that the most promising direction of development of algorithms for protection against SPGFs is the use of components of higher current harmonics.
      PubDate: 2019-12-02
       
  • Experience in the Development and Implementation of Modernized Designs of
           Sliding Bearings of Turbine Generator Units
    • Abstract: Bearing assemblies in many respects determine the operating reliability of turbine generator units. Experience in operating a number of hydropower plants indicates that these assemblies remain a problem and require redesigning. This article describes the authors’ technical developments in modernizing bearings and experience in their implementation, showing the reliability and effectiveness of the proposed solutions.
      PubDate: 2019-12-02
       
  • Single-Cylinder Steam Turbine for Powers Up to 100 MW with Axial Exhaust
           Pipe
    • Abstract: The design of a new single-cylinder steam turbine for powers up to 100 MWwith an axial exhaust pipe is discussed. The turbine belongs to turbine class A.3. It can operate in steam power and steam-gas cycles. It is intended for operation at newly commissioned power plants, including those with air condenser systems (ACS). A.3 class turbines are single-shaft single-cylinder machines with loop-type steam circulation in the flow path, and can be used both for radial and axial exhaust hood arrangements. In this paper, an axial exhaust version with an air condenser system is described. The turbine cylinder consists of four major parts: steam intake path made from two cast housings– inner and outer– along with intermediate and exhaust welded parts. The flow-through part is organized as follows: on passing through the left flow stages, steam is diverted by 180° and is directed along the inter-housing space to the right flow stages. The full design cycle for this single-cylinder turbine with an axial exhaust pipe was completed in less than 9 months. The design documentation for this steam turbine consists entirely of 3D-models (100% of component parts and assemblies).
      PubDate: 2019-11-29
       
  • Implementing the System Functions of the Automatic Proportional-Derivative
           Excitation Control of Synchronous Generators
    • Abstract: Subsystems of Russian automatic excitation regulators that ensure the maximum dynamic stability and effective damping of oscillations in an electric power system are described. They are compared to stabilizers included in international and national standards of other countries. It is shown that the Russian system stabilizer PSS2RU is effective in oscillation damping in various circuits and modes.
      PubDate: 2019-11-29
       
  • Features of Temperature Monitoring of Overhead Power Transmission Lines
           with Insulated Wires
    • Abstract: When monitoring the temperature of insulated wires, the temperature is measured on the surface of the insulation rather than the conductor. The insulation is made of cross-linked polyethylene with low heat conductivity, which leads to a significant temperature difference between the conductor and the insulation surface. A method of calculating the temperature of the conductor from the temperature measured on the insulation surface is described. The permissible surface temperatures of 20 and 35 kV SIP-3 wires that allow controlling the line loading are determined.
      PubDate: 2019-11-28
       
  • Diamond-Cutting Technology for Underwater Repair and Retrofit of Hydraulic
           Structures
    • Abstract: The managerial and technological aspects of using diamond-cutting technologies for underwater operations in hydraulic engineering and engineering solutions for repair and retrofit of hydraulic structures are considered.
      PubDate: 2019-11-28
       
  • Determining the Elevations of Industrial Sites of Nuclear Power Plants
           Located in Floodplains
    • Abstract: A method is proposed for determining the elevations of industrial sites of NPPs and other high-risk facilities located near water channels and water bodies, and is based on constructing a curve that associates water level with the probability of reaching these levels in a broad range of variation of probabilities. This makes it possible to enhance the reliability of determining the elevation of flooding for an assumed probability, ensure invariance to the standards of project design, and evaluate the effectiveness of the magnitude of the required reserve. A description of the method of constructing such a curve is presented using the example of the Rooppur NPP under project on the Ganges River (Republic of Bangladesh). The calculations employ both the method of extrapolation of field data and numerical hydrodynamic modeling of a combination of several hydrometeorological phenomena of rare repeatability, in order to determine the maximum levels of high waters, including taking into account possible climate changes. An evaluation of the risks of flooding of the industrial site was conducted, and an optimum elevation from the point of view of risk minimization was obtained.
      PubDate: 2019-11-28
       
  • Assessment of State of Backfill Material in Large-Diameter Shells
           Subjected to the Effect of Wind Waves
    • Abstract: Results of experimental investigations of large-diameter shells subjected to regular waves in the construction period are presented. Factors responsible for a loss of stability of the backfill material are identified.
      PubDate: 2019-11-28
       
  • Multilayer Anti-Seepage Liners Based on Bentonite Mats: Comparison of
           Their Effectiveness
    • Abstract: Multilayer and combined anti-seepage liners, including bentonite mats, geomembranes, geotextile, rock fills, and soil are considered. The effectiveness of the multilayer bentonite mat liner is evaluated for the Don Main Canal as an example.
      PubDate: 2019-11-28
       
  • Operational Features of Combined-Cycle Power Plants at Large Frequency
           Excursions
    • Abstract: Currently, the share of combined-cycle power plants (CCPP) in the total installed power of Russia has increased due to their advantages over conventional power plants. Therefore, it is necessary to have a clear idea of how CCPPs operate in different modes. Most of the CCPPs installed in Russia were produced by foreign companies, which increases the uncertainty of data on the operation of CCPPs. Modeling of CCPPs and their operational features at large frequency excursions are discussed. Low-frequency events are considered in detail. If the compressor and the turbine are direct coupled, a frequency decrease leads to a lower compressor speed and, consequently, to reduced air supply to the combustion chamber. As a result, the air/fuel ratio is distorted, which can cause an increase in the gas temperature. To recover the temperature, the temperature controller signals to reduce the fuel supply. Thus, upon frequency decrease, the CCPP can start reducing power, which can lead to an increase in power deficit and an emergency. These processes are modeled mathematically. To prevent emergencies, an algorithm for power boosting during low frequency events is proposed. It is shown that this algorithm helps to increase the permissible power deficit, keeping the gas temperature within the permissible range.
      PubDate: 2019-11-28
       
  • A Method for Systematic Design of Protection Against Flooding in a River
           Basin
    • Abstract: The augmented volume of existing and anticipated hydropower installations may prove insufficient for transforming a design flood when there is an increase in the extremal flood discharges of water under the conditions of climate change. Amethod of sharing flood-control capacity between multipurpose hydropower installations provided with hydroelectric power plants on a mainstream and a system of constricting hydropower installations with self-regulated reservoirs on side tributaries is proposed to achieve the required conditions in the headrace and tailrace channels of hydropower installations. Results of simulation of the management of flood discharges in a river basin by a system of hydropower installations under the conditions of climate change are analyzed in the article. The use of geological information systems for assessing the effect of floodcontrol hydropower installations on the environment accompanied by an evaluation of their parameters is considered.
      PubDate: 2019-11-28
       
  • Optimization of Restorative Heat Treatment of Turbine Housings Made from
           Low Alloy Steel
    • Abstract: Metal of steel 20KhMFL housings after restorative heat treatment with a different amount of normalizing and high-temperature tempering (1N + T, 2N + T, 3N + 2T) has been studied by experiment for the first time as applied to modernizing turbines. Data for the short-term and stress-rupture strength, ductility in tension, critical brittleness temperature, critical notch opening, and hot hardness of metal, and the amount and number of defects for repair are analyzed. The advantage of heat treatment by a regime with single-stage normalizing and high-temperature tempering (1N + T) is demonstrated.
      PubDate: 2019-11-28
       
 
 
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