scholarly journals Experimental study of quality and electricity losses in low voltage rural electric networks

2021 ◽  
Vol 23 (3) ◽  
pp. 224-237
Author(s):  
O. S. Rakhimov ◽  
D. N. Mirzoev ◽  
E. I. Grachieva
Keyword(s):  
Low Voltage ◽  
Experimental Studies ◽  
Digital Information ◽  
Electric Networks ◽  
Daily Consumption ◽  
Measuring Device ◽  
Three Phase ◽  
The Republic ◽  
Information Database

THE PURPOSE. Due to the increase in the number of farms in the Devashtichsky district of the Sughd region of Tajikistan, over the past 3-4 years, a disproportionate distribution of electricity in the 0.4 kV network has been observed. Unbalance currents of phase loads in relation to asymmetric phase voltages at the terminals of consumers of a three-phase network cause additional losses of electricity, which can reach 21% of the standard losses. In the decree of the President of the Republic of Tajikistan dated May 10, 2009 No. 29 “On energy saving and reduction of electricity losses” it is indicated that there is a need to study the quality of electricity in rural 0.4 kV networks and its compliance with GOST 32144. 2013, as well as an assessment of losses electricity in its distribution structure is an important task in the field of rural electricity. METHODS. A single-line diagram of a 0.4 kV network with initial parameters, which were refined during the survey of the network, and the current loads of outgoing lines were investigated. Experimental studies of the quality of electricity and assessment of the level of losses in the low- voltage network were carried out using a complex measuring device «Energotester» PKE - A - C4. RESULTS. The studies allowed obtaining data on the daily consumption of electricity in individual outgoing lines, information on the characteristics of consumers, digital information (database) on indicators of the quality of electricity in low-voltage networks. CONCLUSIONS. It has been established that the main factors influencing the losses of electricity in low-voltage networks are: incommensurability of the power of transformers of transformers and consumers, uneven loading of individual phases, a significant effect of individual converters on the quality of energy. Measures are forecasted to reduce losses and improve the quality of electricity in low-voltage rural networks of 0.4 kV.

scholarly journals Experimental study of quality and electricity losses in low voltage rural electric networks

2021 ◽  
Vol 23 (3) ◽  
pp. 209-222
Author(s):  
O. S. Rakhimov ◽  
D. N. Mirzoev ◽  
E. I. Grachieva
Keyword(s):  
Low Voltage ◽  
Experimental Studies ◽  
Digital Information ◽  
Electric Networks ◽  
Daily Consumption ◽  
Measuring Device ◽  
Three Phase ◽  
The Republic ◽  
Information Database

THE PURPOSE. Due to the increase in the number of farms in the Devashtichsky district of the Sughd region of Tajikistan, over the past 3-4 years, a disproportionate distribution of electricity in the 0.4 kV network has been observed. Unbalance currents of phase loads in relation to asymmetric phase voltages at the terminals of consumers of a three-phase network cause additional losses of electricity, which can reach 21% of the standard losses. In the decree of the President of the Republic of Tajikistan dated May 10, 2009 No. 29 “On energy saving and reduction of electricity losses” it is indicated that there is a need to study the quality of electricity in rural 0.4 kV networks and its compliance with GOST 32144. 2013, as well as an assessment of losses electricity in its distribution structure is an important task in the field of rural electricity. METHODS. A single-line diagram of a 0.4 kV network with initial parameters, which were refined during the survey of the network, and the current loads of outgoing lines were investigated. Experimental studies of the quality of electricity and assessment of the level of losses in the low- voltage network were carried out using a complex measuring device «Energotester» PKE - A - C4. RESULTS. The studies allowed obtaining data on the daily consumption of electricity in individual outgoing lines, information on the characteristics of consumers, digital information (database) on indicators of the quality of electricity in low-voltage networks. CONCLUSIONS. It has been established that the main factors influencing the losses of electricity in low-voltage networks are: incommensurability of the power of transformers of transformers and consumers, uneven loading of individual phases, a significant effect of individual converters on the quality of energy. Measures are forecasted to reduce losses and improve the quality of electricity in low-voltage rural networks of 0.4 kV.

scholarly journals On the choosing the installation location the balancing devices in low-voltage distribution electric networks

2021 ◽  
Vol 2094 (5) ◽  
pp. 052012
Author(s):  
I V Naumov ◽  
S V Podyachikh
Keyword(s):  
Power Quality ◽  
Low Voltage ◽  
Experimental Studies ◽  
Distribution Networks ◽  
Electrical Networks ◽  
Process Change ◽  
Electric Networks ◽  
Concentrated Load ◽  
Operating Modes ◽  
Three Phase

Abstract The experimental studies result on the power quality and additional power losses analysis caused by the asymmetric modes occurrence in three-phase four-wire 0.38 kV electrical networks are considered. The operating modes 38 kV networks several types simulation – with power take-off nodes distributed along the power line, and an electric network with a concentrated load is carried out. The programs have been developed that allow to assess the change in indicators characterizing asymmetric modes, as well as programs that allow us to visualize this process change. The most installing special symmetrical devices appropriate places in electric networks with a distributed load (rural electric distribution networks) and concentrated power take-off nodes electric networks (urban electric networks) have been identified to minimize losses and improve the power quality. A numerical studied indicators analysis was performed.

scholarly journals DETERMINATION OF OPTIMAL CHARACTERISTICS OF DEVICES FOR VOLTAGE UNBALANCE REDUCING IN LOW VOLTAGE ELECTRIC NETWORKS

2020 ◽  
Vol 2020 (6) ◽  
pp. 43-46
Author(s):  
A.F. Zharkin ◽  
◽  
S.O. Palachov ◽  
A.G. Pazieiev ◽  
D.O. Malakhatka ◽  
...  
Keyword(s):  
Simulation Modeling ◽  
Low Voltage ◽  
Electric Energy ◽  
Electrical Safety ◽  
Electric Networks ◽  
Voltage Unbalance ◽  
Zero Sequence ◽  
Unbalanced Loads

Ways of searching for optimal ways to improve the quality of electric energy in electric networks with dispersed unbalanced loads using zero-sequence current filters are considered, which take into account the possibility of ensuring the desired performance with minimal cost and taking into account the peculiarities of operation in emergency network conditions and ensuring electrical safety of consumers. Corresponding calculations were carried out using simulation modeling. References 6, figures 4.

scholarly journals EXPERIENCE OF SEALING WEAK WATER-SATURATED LOESS SOILS WITH VERTICAL SAND DRAINS IN SEISMIC REGIONS

2019 ◽  
Vol 10 (2) ◽  
pp. 26-35
Author(s):  
R. A Mangushev ◽  
R. A Usmanov
Keyword(s):  
Experimental Studies ◽  
Layer By Layer ◽  
Loess Soils ◽  
Central Asian ◽  
Parameter Field ◽  
The Republic ◽  
Seismic Impact ◽  
Water Saturated

The article presents the results of studies relating to compaction of weak water-saturated forest soils and vertical sandy drains under static and seismic effects in the conditions of the Central Asian region. Considering the absence of any experimental and theoretical studies of the application of this parameter, field (in-situ) experimental studies were carried out to identify the possibilities and effectiveness of its use in conditions of weak water-rich loess soils of the Republic of Tajikistan. The article discusses changes in the basic physical and mechanical characteristics of soils and experimental structures. At the experimental site, three plots with a size of 10·10 m were prepared, where the plot was loaded without the installation of vertical sand drains; 3·3 m to a depth of 6.0 m. Static loading of experimental plots by a derivative by layer-by-layer dumping of ground material with measurement of total and layer-by-layer deformations of the packed thickness. Imitation of seismic impact with an intensity of 8 points was carried out using short-delayed explosions of explosive charges. Studies have shown the effectiveness of the use of vertical sandy drains for compaction of weak water-saturated loess soils. Recommendations are given on the use of explosion energy to improve the quality of soil compaction.

scholarly journals Forecasting the quality of mineral oils during oil refining according to the fuel and oil flow chart at Atyrau Refinery

2021 ◽  
Vol 288 ◽  
pp. 01028
Author(s):  
Aigul Bukanova ◽  
Fazilat Kayrliyeva ◽  
Saule Bukanova ◽  
Nagima Karabassova ◽  
Lydia Sakipova
Keyword(s):  
Viscosity Index ◽  
Experimental Studies ◽  
Chemical Properties ◽  
Vacuum Gasoil ◽  
Oil Refining ◽  
Mineral Oils ◽  
Type Composition ◽  
Oil Flow ◽  
The Republic

The article discusses the problem of rational oil refining at Atyrau Refinery. Based on a detailed study of the properties of low-sulfur oils of Kazakhstan, in order to assess the potential for the selection of petroleum oils, effective refining methods with modern technologies are shown. A graph is given that allows us to assess the raw mate-rial potential of the Republic of Kazakhstan for lube fractions of oil. The potential reserve of the considered deposits can fully meet the needs of the Republic in oils. The physical and chemical properties of crude oil sup-plied to Atyrau refinery, with a view to their use as raw materi-als for the oil refining and production. The results of experiments on hydrocracking of the plant’s vacuum gasoil are also presented, indicating that this refining option allows you to obtain not only light distillates (gasoline and diesel fuel), but also excellent base oils. This can significantly advance the oil refining in the enterprise as a whole. On the basis of experimental studies, the correlation dependence of the viscosity index on the hydrocarbon-type composition of oils was revealed, which allows predicting the quality of the resulting product.

scholarly journals Investigation of the quality of Arctic diesel fuel imported to the Republic of Sakha (Yakutia)

2018 ◽  
Vol 80 (3) ◽  
pp. 358-361
Author(s):  
E. L. Iovleva
Keyword(s):  
Low Temperature ◽  
Diesel Fuel ◽  
Experimental Studies ◽  
Geographic Location ◽  
Normative Values ◽  
Temperature Characteristics ◽  
Gas Stations ◽  
Operational Characteristics ◽  
The Republic

The results of experimental studies of the quality of Arctic diesel fuel taken from various gas stations of the Republic of Sakha (Yakutia) are shown. The main operational characteristics of Arctic diesel fuel are investigated. The work was carried out in the laboratory of the department "General, analytical and physical chemistry". Taken diesel fuel by geographic location is divided into 3 parts: central, northern and district. From each region, 3 samples of Arctic diesel fuel were taken from various gas stations. The study found that the selected main indicators of diesel fuel: density, viscosity, fractional composition and low-temperature characteristics – differ from the normative values. The worst results were shown by diesel fuel samples from the northern part of the Republic of Sakha (Yakutia). Samples of arctic diesel fuel taken from the central part and district, generally meet the quality standards of GOST 305-82, but for low-temperature characteristics, do not meet the standard.

scholarly journals Efficiency of pelleting of sugar beet seeds in centrifugal pelleting machine

2020 ◽  
Vol 58 (3) ◽  
pp. 364-372
Author(s):  
V. R. Petrovets ◽  
D. A. Mikheyeu ◽  
V. P. Gnilozub
Keyword(s):  
Sugar Beet ◽  
Experimental Studies ◽  
Bentonite Clay ◽  
Spherical Shape ◽  
Good Alternative ◽  
Technological Parameters ◽  
The Republic ◽  
Domestic Variety ◽  
Finished Mixture

Seed pelleting is an efficient way to improve the sowing quality of seeds. Diverse positive effect of pelleting is mostly noticeable for beet seeds. Increased size and spherical shape of seeds with shell allows to use precision seeding technology, as well as fertilizers and protective agents being part of the shell, increase their sowing potential and finally increase yields. To obtain pelleted seeds, it is required to use a specialized line with a seed pelleting machine being the main equipment. An improved design of centrifugal batch-operated seed pelleting machine has been developed and manufactured in Belarusian State Agricultural Academy. To activate the process of rolling the shell in the mixing chamber of the pelleting machine, it was proposed to use separately installed blades. Based on theoretical and experimental studies, the main structural and technological parameters of the pelleting machine has been determined to ensure the highest quality of pelleted seeds. Seeds of sugar beet of the domestic variety “Polybel” obtained in a favorable climate were selected for experimental studies. Finished mixture based on bentonite clay was selected as a filler of the seed coat. After the coat formation, the insect-fungicidal dressing agent Prestige was applied to the seeds. The seeds of sugar beet of the domestic variety “Polybel” obtained on experimental pelleting machine showed high results in germination and yield. They are comparable to imported sugar beet hybrids. Pelleting of seeds of domestic varieties of sugar beet on the territory of the Republic of Belarus can become a good alternative to imported pelleted seeds, especially considering their cost, which significantly exceeds the cost of untreated seeds.

Estimates on poverty in Russia and the additional measures to reduce it at the regional level

2020 ◽  
Vol 18 (4) ◽  
pp. 739-752 ◽  
Author(s):  
R.M. Sadykov
Keyword(s):  
Poverty Rate ◽  
Regional Level ◽  
Living Standards ◽  
Standard Of Living ◽  
High Quality ◽  
Social Standard ◽  
Republic Of Bashkortostan ◽  
The Republic ◽  
Sociological Studies

Subject. This article deals with the issues of social justice and a high quality of life, creating favorable economic and social conditions. Objectives. The article aims to assess the rate and changes in poverty in Russia and the Republic of Bashkortostan and develop complementary measures to reduce it. Methods. For the study, I used the methods of logical, comparative, economic and statistical analyses, the results of sociological studies, and official statistics. Results. The article highlights additional measures to reduce poverty in the region, including the establishment of a minimum social standard of living in each particular region that determines the poverty rate. Conclusions. Various factors, such as economic sanctions, economic slowdowns, territorial and regional imbalances, lead to living standards decline and poverty rise.

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