Том 51, № 3 (2017)
- Жылы: 2017
- Мақалалар: 19
- URL: https://journals.rcsi.science/1570-145X/issue/view/15306
Hydrotechnical Construction
Change to the Permafrost-Hydrogeological Environment During Construction of the Ust’-Srednekanskaya Hydroelectric Power Plant
Аннотация
The change to the permafrost-hydrogeological environment during construction of the Ust’-Srednekanskaya Hydroelectric Power Plant is examined, as well as change associated with construction timeframes that were extended beyond those that were was originally proposed in the project.
Article
Condition of the Gotsatli Hydroelectric Power Plant Dam During Filling of the Reservoir According to Field Observations and Numerical Modeling
Аннотация
Information on an evaluation of the condition of the Gotsatli hydroelectric station earth dam during filling of the reservoir and the results of field observations and numerical modeling are given. The characteristics of the seepage regime of the dam and stress-strain state of the asphalt concrete diaphragm are revealed on the basis of the data otained.
Closure of the Bureya River in April 2016 and Filling of the Plinth of the Lower Bureya Dam
Аннотация
At the preliminary design stage, the closure of the Bureya river was scheduled for October 20, 2015. The actual status of construction necessitated rescheduling the river closure for March 20, 2016, alteration of design discharges, 3D simulation, and adjustment of design solutions. The actual conditions of river closure on April 19, 2016 are described.
Construction of Nizhny Novgorod Low-Head Water Development for Ensuring Flow-Through Navigation on the Upper Volga
Аннотация
Hydrological aspects of ensuring flow-through large-capacity navigation in the tailwater of the Nizhny Novgorod (Gorky) water development are considered. Concise hydrological characteristics are presented for the reservoir of the projected Nizhny Novgorod low-head water development, one of the key objects of the water transport infrastructure of the European part of the Russian Federation, construction of which is provided for by the Federal Target Program “Development of Transport System of Russia (2010 – 2020),” the Transport Strategy of the Russian Federation for the period until 2030, and also the Strategy of Development of Inland Water Transport of the Russian Federation for the period until 2030.
Acoustical Monitoring of the Stress-Strain State of Welded Connections of a Rotor Frame During Upgrade of the Hydroelectric Unit of the Nizhnekamsk Hydroelectric Power Station
Аннотация
Results are presented for research by an acoustic method, of residual stresses and the plastic strains that occurred in a spoke of a rotor frame of the main generator after welding reinforcing plates (additional ribs for rigidity) during upgrade work on the hydroelectric unit of the Nizhnekamsk hydroelectric power station.
Operational Capability of an Electric Pump Unit with New and Worn Rotor Wheels
Аннотация
This article is devoted to experimental studies of the operational capability of an electric pump unit in operation with new and worn out rotor wheels. Results of measurements are presented for the operating parameters of the electric pump unit, vibration monitoring, and thermal imaging, and the calculation of static durability of a shaft, based on which the main conclusions are formulated.
Multi-Purpose Vibratory Driver for Hydraulic Engineering Construction
Аннотация
The VPP-2 vibratory driver and the Russian method based on it for compacting foundations using a vibratory compactor of longitudinal vibration with a spatial compactor in a “vibro-herringbone” form have been widely used around the world for driving (extraction of) a piling and vibration compaction of sandy foundation soil, both water-saturated or slightly damp and combinations thereof. The article presents the results of a theoretical substantiation of the developed calculation model and field tests of a method of deep vibration compaction of foundations, showing its shortcomings. These shortcomings were most clearly manifested during compaction of heavy thickness of the sandy foundations (9 m and greater). It is shown that the shortcomings of the known vibratory compactor can be eliminated or significantly decreased by using a vibratory compactor with radial elements placed at a specified height in the lower part of the compactor probe. This makes it possible to improve the technical characteristics of the vibratory compactor operating with a reliable and economic vibratory driver. The main results of these researches were reported at the 15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, “New innovations and sustainability” (15ARC) in Fukuoka, Kyushu, Japan, on November 9 – 13, 2015.
Use of Vibration for Monitoring the Condition of Turbogenerator Stators
Аннотация
The physical causes of the radial vibration of the stator core of a two-pole turbogenerator are considered. Their relationship, influence on the vibration of the core, and dependence on the operating conditions of the turbogenerator are shown. The principles and practice of using vibration parameters for monitoring the condition of stators are described and justified.
Features of Vibration Adjustment of T-185/210-16.2 Turbogenerator
Аннотация
Some features of the vibratory condition of the prototype T-185/210-16.2 + TZFP-220-2UZ turbogenerator during the first years of operation that required thorough vibration survey and analysis to identify the main causes of the increased vibration of the bearings and shafting. The main causes of the increased vibration of the turbogenerator include a slight residual unbalance of the rotor, design features, and operating conditions. A package of measures was taken to reduce the vibration of the bearings and rotor journals in all operating conditions to a level meeting international requirements.
Measurement of Residual Creep Deformation of Elements of High-Temperature, High-Chromium Steel Steam Pipes Without Using Reference Marks
Аннотация
The urgency of testing residual creep deformation of high-chromium steel steam pipes is substantiated. For cases when the high-chromium steel pipes are delivered from the manufacturer without reference marks, it is suggested to measure residual creep deformation not by the traditional method, i.e., without the use of reference marks. For this purpose, the design of a device enabling checking residual deformation directly on the outside surface of a pipe element is proposed and the principle of action of this device is described. The acceptable accuracy and reproducibility of the measurement results by means of the proposed device is substantiated.
Noise Abatement of Forced-Draft Fans Using Absorptive Silencers
Аннотация
Absorptive silencers of different types for noise abatement of forced-draft fans, and the factors influencing the characteristics of silencers, are examined. Adescription is provided for the silencers developed and introduced by authors for noise abatement of induced-draft fans and fans. It is shown that silencers have specific characteristics and facilitate the provision of acoustic safety of the population of nearby residential areas.
Evaluation of the Effect of the Duration of the Repair Status of the Electrical Network on an Increase in Electric Power Losses1
Аннотация
The effect of the duration of the repair status of networks, their load, composition, and configuration of schemes on an increase of electric power losses in 6 – 35 kV distribution networks is examined. For the report interval (a month), as a result of deterministic modeling of multiple regimes, the character was determined and the graphic and analytical dependences of the increase in the relative value of electric power losses on the duration of the repair status of the network and its load were obtained. The statistical test method is the basis of the investigations.
Calculation of Admissible Currents for the Protected Wires of 110 kV Overhead Lines
Аннотация
Protected wires have insulation from cross-linked polyethylene with low heat conductivity, which impairs heat removal from the hot wire. A methodology is proposed for designing admissible continuous currents for the insulated wires of overhead transmission lines, taking into account various climatic conditions, and based on the solution of the equation of thermal balance. The materials provided in this article can be used for design and operation of overhead transmission lines on which the protected wires are used.
Thermal Power Plants
Stress-Rupture Strength, Structure, and Properties of Welded Joints of 15Kh1M1F and X10CrMoVNb9-1 (P91) Steels
Аннотация
Stress-rupture tests of transverse similar-metal and dissimilar-metal welds are simulated numerically. The dependence of the stress-rupture strength of P91 steel weldments on the relative width of the interlayer and the ratio between the creep rates of the parent metal and the weakened region in the heat-affected zone is identified and described. An upper bound estimate of the stress-rupture strength of a dissimilar-metal weld is obtained using a model of a weldment with two soft interlayers with identical properties. Achange of the point of rupture with reduction in the stress is found numerically and confirmed experimentally.
Power Systems and Electric Networks
Study of Transient Ferroresonance on a PTL with a TCSR
Аннотация
The phenomenon of transient ferroresonance that arises in a PTL from TCSR magnetization currents is examined. Data on the design and model of the electromagnetic part of a TCSR are given. It is shown that use of automatic reclosing of TCSR during PTL setup under voltage prevents excitation of transient ferroresonance.