Journal articles on the topic 'KV electrical network'
To see the other types of publications on this topic, follow the link: KV electrical network.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'KV electrical network.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Naumov, I. V., S. V. Podyachikh, D. A. Ivanov, A. N. Tretyakov, M. A. Yakupova, and E. S. Fedorinova. "The 0.38 kV electrical networks unbalancing operating modes optimization." IOP Conference Series: Earth and Environmental Science 990, no. 1 (February 1, 2022): 012069. http://dx.doi.org/10.1088/1755-1315/990/1/012069.
Full textAbstract:
Abstract The equipment 0.38 kV low-voltage electrical networks is not a satisfactory level. Such electric networks operating modes management is carrying out save energy measures and electricity supply improve efficiency in general largely allows. As a result, the electric energy supplied parameters obtaining actual nature information about to consumers through these electric networks is the developing the power transmission requirements measures basis comply. The article presents results current unbalancing modes objective studies in 0.38 kV an electrical network that feeds Irkutsk multi-storey residential building electric consumers. The analysis electric energy parameters, power quality indicators changes as well as electricity lo sses caused by the currents unbalance in the studied electric network are presented. The calculate parameters and using results of balancing device efficiency as well as its influence on the quality indicators studied and electrical energy loss in the studied electrical network are presented.
2
Tavarov, Saidjon Sh, Aleksandr I. Sidorov, Rustam G. Valeev, and Ekatirina V. Zykina. "Estimation Method of the State of 6-10 kV Distribution Network." European Journal of Electrical Engineering 23, no. 2 (April 23, 2021): 95–101. http://dx.doi.org/10.18280/ejee.230202.
Full textAbstract:
The article analyzes the state of the elements of 6-10 kV distribution electrical networks in Dushanbe, showing the excess of reliability and efficiency indicators of the considered electrical networks from the permissible 10% values. For the first time, the factors influencing the reliability indicators of 6-10 kV electrical distribution network elements in Dushanbe were identified and a mathematical model of networks for determining the state of 6-10 kV electrical distribution network elements in Dushanbe was proposed. On the basis of them, an algorithm for monitoring the state of the elements of 6-10 kV electrical distribution networks in Dushanbe is proposed, which makes it possible to evaluate the efficiency of 6-10 kV distribution electrical networks in terms of undersupply of electricity - ΔW.
3
Panfilov, Alexander, Alexander Vinogradov, Alina Vinogradova, Vadim Bolshev, Zumeira Shakurova, and Elena Zaugolnikova. "Challenges and methods of monitoring the occurrence of unsanctioned voltage in the power grid." E3S Web of Conferences 288 (2021): 01111. http://dx.doi.org/10.1051/e3sconf/202128801111.
Full textAbstract:
The review of sources dedicated to the issues of monitoring in electric networks made in the article showed that the works of many scientists are aimed at developing methods, technical means, systems for monitoring current and voltage in various operation modes of power grids. The main objectives of monitoring are identified, it is shown that monitoring of parameters in the network operation modes provides observability of the network, which, in turn, allows to make timely decisions about switching in the network, regulating the parameters of the network operation modes. The relevance of monitoring for detecting cases of unauthorized voltage in the 0.4 kV power networks is shown. Similar cases lead to the risk of electric shock to people, increasing the risk of operating electrical networks. Identification of the occurrence of unauthorized voltage in the 0.4 kV network provides ways to prevent its transformation at substations of 10/0. 4 kV to a voltage of 10 kV. Therefore, it is relevant to develop methods for detecting unauthorized voltage in the 0.4 kV electric system. The methodological principles and one of the developed methods for monitoring the occurrence of unauthorized voltage in power transmission lines of 0.4 kV and blocking the reverse transformation on substations 10/0.4 kV, as well as the device for its implementation, are shown.
4
Vasiliev, N. V., D. A. Kartashev, and N. Yu Krishtopa. "Analysis of operating modes of three-phase distribution networks using their digital models of 0.4 kV." IOP Conference Series: Earth and Environmental Science 979, no. 1 (February 1, 2022): 012110. http://dx.doi.org/10.1088/1755-1315/979/1/012110.
Full textAbstract:
Abstract Today, the problem of the quality of electricity is of particular relevance, because it is one of the most important conditions for the economical and long-term operation of electrical equipment in industrial enterprises, as well as in housing and communal services. Analysis of existing methods, as well as other studies of the quality of electrical energy in 0.4 kV networks, shows the limitations of existing methods for assessing the quality of electricity and determining power losses in 0.4 kV networks. The total relative losses of electricity in the electric grids of Russia are several times higher than in the grids of other European, industrialized countries. Roughly the maximum relative technological losses of electricity in 0.4 kV networks should be no more than 8% in relation to the supply of electricity to the network. This article briefly outlines the methodology for constructing a digital model of a 0.4 kV network in asymmetric modes for the purpose of element-wise calculation of losses in all sections of the network and determining the quality of electricity at consumer connection points.
5
Bolshev, V. E., A. V. Vinogradov, A. V. Vinogradova, A. V. Bukreev, and S. R. Khasanov. "Study of statistical data on the composition of electric distribution networks on the example of a Kaluga region district." E3S Web of Conferences 220 (2020): 01005. http://dx.doi.org/10.1051/e3sconf/202022001005.
Full textAbstract:
Sustainable operation of the power grid complex is impossible without reliable and high-quality operation of 10/0.4 kV electrical distribution networks, which are the final link in the system for providing consumers with electric energy and are in direct interaction with a specific consumer. The study of statistical information on the composition of distribution networks makes it possible to draw conclusions about electrical network state, to implement recommendations for their development and to compare distribution electrical networks in different regions. This information is especially relevant for analyzing the reliability of power supply to consumers connected to the considered electrical distribution networks. Such indicators of network structure as the length of electric transmission lines of different voltages and power transmission schemes are studied. It also analyzes the number of damages in networks, the causes of these damages, data on the time of planned and emergency outages. This paper considers the structure of 10/0.4 kV electrical distribution networks located on the territory of one of the districts of the Kaluga region. The sample for distribution networks was: 1190 overhead transmission lines and 536 transformer substations. Consumers in the district are 21671 subscribers of individuals and 1986 subscribers of legal entities, that is, a total of 23657 metering points. On the lines of 0.4 kV and 10 kV, the percentage of their isolated design was revealed. The share of single-transformer and two-transformer versions of transformer substations is analyzed.
6
Gritsay, Alexander, Evgeny Chebanenko, Viktor Potapov, Elena Andreeva, Rustam Khamitov, and Igor Chervenchuk. "On the development of a software and hardware complex for modeling a power grid controller and microgeneration facilities based on renewable energy sources in LV 0,4 kV networks." Analysis and data processing systems, no. 1 (March 26, 2021): 61–72. http://dx.doi.org/10.17212/2782-2001-2021-1-61-72.
Full textAbstract:
The article discusses the issues of connecting microgeneration facilities based on renewable energy sources (RES) to electric networks of low voltage (LV) 0,4 kV. This method of connection will allow the use of microgeneration facilities as network sources of energy, and at the same time unused electrical energy generated by micro-generation facilities can be supplied to a low-voltage network of 0,4 kV. Methods of simulation modeling of the processes of electrical energy distribution in the power supply system with microgeneration objects are proposed; the requirements for the power grid controller used to ensure the connection of micro-generation facilities to the low voltage network are formulated. The problems arising in connection with this are analyzed and the ways of their solution are offered. The proposed methods for the development of software and hardware solutions using modern methods of simulation of electrical energy generation and distribution based on rapid prototyping in the Matlab Simulink environment make it possible to carry out field experiments in order to simulate the processes occurring in 0,4 kV low voltage electrical networks using microgeneration objects prosumers.
7
SKRYPNYK, S., and A. SHEINA. "Short circuits currents comparison of 6 (10) kV and 20 kV." Journal of Electrical and power engineering 14, no. 1 (February 27, 2020): 21–26. http://dx.doi.org/10.31474/2074-2630-2020-1-21-26.
Full textAbstract:
Most failures in electrical installations are caused by short circuits (short circuits), which occur as a result of a failure in the electrical strength of the insulation of the conductive parts. A short circuit is an electrical connection of two points of an electric circuit with different values of potential, which is not provided by the design of the device, which interferes with its normal operation. Short circuits may result from a failure of the insulation of the current-carrying elements or the mechanical contact of the non- insulated elements. Also called a short circuit is a condition where the load resistance is less than the internal resistance of the power source. The reasons for such violations are various: aging of insulation, breakages of wires of overhead transmission lines, mechanical damages of isolation of cable lines at ground works, lightning strikes in the transmission line and others. Most often, short-circuits occur through transient resistance, such as through the resistance of an electric arc that occurs at the point of damage to the insulation. Sometimes there are metallic short circuits in which the resistance of the electric arc is very small. The study of short circuits in the power grid is a major step in the design of modern electrical networks. The research is conducted using computer software, first by modeling the system and then simulating errors. A malfunction usually leads to an increase in the current flowing in the lines, and failure to provide reliable protection can result in damage to the power unit. Thus, short-circuit calculations are the primary consideration when designing, upgrading, or expanding a power system. The three-phase short circuit is the least likely. However, in many cases, the three-phase short circuit is associated with the most severe consequences, as it causes the highest power imbalances on the shafts of the generators. The study of transients begins with the mode of three-phase closure due to its relative simplicity in comparison with other types of asymmetry. In most cases, the analysis and calculation of the transient regime of the electrical system involves the preparation of a calculated scheme of substitution, in which the parameters of its elements are determined in named or relative units. The electrical substitution circuitry is used to further study the transients in the power system. The definition of electrical and electromagnetic quantities in relative units is widely used in the theory of electric machines. This is because it significantly simplifies the theoretical calculations and gives the results a generalized view in the practical calculations of currents and residual voltages at the short circuit. By the relative value of any value is understood as its relation to another value of the same name, taken as the base. So, before presenting any quantities in relative units, we need to choose the basic units. In the electrical system with increased voltages, the overall load capacity of the network increases, which in turn makes it possible to supply high-quality electrical energy over a greater distance. In the process of comparing the type of transmission lines, it should be noted that the advantages of the cable transmission line. According to the results of the calculation of short-circuit currents, it can be concluded that in networks with a larger line cross-section and a higher voltage, the short-circuit currents are larger. Thus, during the transition of the electric networks to the higher voltage class of 20 kV, the currents of the KZ increased by 43% compared to the 6 kV electric network. This analysis shows that the importance of reliable power supply in the power supply system for high voltage classes must be high and have equipment to prevent emergencies. In the future, it is planned to develop a systematic calculation of short-circuit currents for a number of transmission lines and to conduct mathematical modeling in the system of applications for the study of transient processes at short circuits.
8
Lvov, Mikhail Yu, and Dmitriy Yu Kamnev. "Application of the 20 kV Voltage Class in the Electric Power Supply Systems of Modern Megalopolises." Vestnik MEI 5, no. 5 (2020): 83–88. http://dx.doi.org/10.24160/1993-6982-2020-5-83-88.
Full textAbstract:
Megacities are characterized by a high level of energy consumption, a significant density of electrical loads and increased requirements for the reliability of power supply to consumers. Traditionally in the USSR and further in Russia, voltage classes of 6 and 10 kV are used for urban distribution electric networks. The increasing density of electric load and electricity consumption does not allow in extremely cramped conditions of developing cities to provide electricity through existing cable lines with a voltage of 6-10 kV due to their limited bandwidth and lack of reliability. The technical condition of the equipment and cable lines in the 6-10 kV supply networks has significant physical and moral deterioration. Existing networks have insufficient redundancy and have practically exhausted their ability to connect new consumers. These circumstances required a decision to switch to a voltage class of 20 kV, which is a strategic direction for the development of medium voltage electrical networks in Moscow. According to this decision, since the 2000s, electric networks with a voltage of 20 kV have been actively developing in Russia and in Moscow. This article analyzes the implemented approaches to the use of an electric network of 20 kV in megacities of different countries.
9
Nassar, Ibrahim A., Mohammed Sh Seif, and Mahmoud M. ElAttar. "Improving the voltage quality of Abu Hummus network in Egypt." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 5 (October 1, 2020): 4458. http://dx.doi.org/10.11591/ijece.v10i5.pp4458-4468.
Full textAbstract:
In this paper the performance of the electrical network of Egypt is studied by considering a small part on the network (Abu Hummus city). The transmission network of Abu Hummus city was created for 66 kV, 11 kV, and 0.4 kV in the digital simulation and electrical network calculation (DIgSILENT power factory software) to study the voltage profiles. The load flow operational analysis was performed to obtain the voltage magnitudes at every bus bar. The voltage magnitudes in 11 kV and 0.4 kV networks were 10% to 15% less than the nominal value due to overloading off the transmission lines and the voltage magnitudes in 66 kV was within permissible limits. By using automatic tap-changing transformer or Static VAR System, the main idea of this paper is to obtain the voltage profiles at every bus bar to improve the voltage quality of the networks, so as to achieve better voltage profiles on the low voltage side without much effect on high voltage side under various operating conditions.
10
Perepecheny, V. "Increasing the parameters of electrical distribution networks of town districts with low load density." Lighting engineering and power engineering 1, no. 57 (April 6, 2020): 28–32. http://dx.doi.org/10.33042/2079-424x-2020-1-57-28-32.
Full textAbstract:
This article presents the results of research on the parameters of electrical networks with a voltage of 6 (10) and 0.38 kV in relation to capital investments. The analysis of existing methods of estimation of parameters before designing for power supply networks in a small town with low load density is carried out. In modern conditions, in the distribution of electrical networks is of paramount importance the introduction of energy-saving schemes and parameters of power supply systems. One of the main ways to implement them is to increase the efficiency of 6-10 / 0.38 kV networks. In the actual design of electrical networks, economic proportionality can not always be maintained for various reasons: the impact of technical constraints, the discreteness of the rated power of transformers and cable crossing scales, a significant deviation of individual capacities of consumers from the average value. In that case there is an increase in the reduced costs. A methodology for determining the optimal power of transformer substations and optimal sections of 0.38 kV power transmission lines is proposed, taking into account the probable nature of the applied load. When assembling the power supply circuit for the optimal form of parameters, voltage, principles of voltage regulation and reactive power compensation. Decisions of this kind are substantiated by technical and economic comparisons of a series of technically acceptable variants of power supply networks. An important measure that facilitates the selection of the most economical option is the assessment of the proposed project, which relates to the selection of the optimal capacity of transformer substation (TS) networks using calculation formulas. The aim of the research was to improve the existing methods on the basis of separate accounting of the reliability coefficient of 0.38 kV and 6-10 kV network. Key words - electric power supply network, network parameters, transformer substation, load density, line wire section, specific load, unit costs, optimum parameter, distribution networks, electric energy.
11
Naumov, Igor V., Sergey V. Podyachikh, and Andrey V. Bastron. "The Power Quality Improving and its Losses Reducing with Balancing Devices." IOP Conference Series: Earth and Environmental Science 979, no. 1 (February 1, 2022): 012160. http://dx.doi.org/10.1088/1755-1315/979/1/012160.
Full textAbstract:
Abstract The method, algorithms, modeling, calculations and analysis the 0.38 kV electric network operation with unbalancing power consumption are considered. It is noted that the 0.38 kV electric networks, being electric low observability networks, are largely characterized by low power quality, which is accompanied by additional losses. An electric network model with a distributed load is presented. The current and voltage asymmetry indicators calculating method is developed, and the specialized balancing device parameters are determined. Bas ed on the obtained expressions, using Matlab technologies, the calculating asymmetric modes program was developed. The studied indicators were calculated for the created electric network model with symmetric and asymmetric loads. The balancing device influence degree on the quality indicators stabilization and the electrical energy additional losses reduction is established.
12
Seheda, M. S., O. M. Ravlyk, Z. M. Bakhor, and A. Ya Yatseyko. "OVERVOLTAGE DURING ARC SINGLE-PHASE EARTH FAILURES IN 35 KV ELECTRICAL NETWORKS." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2021, no. 60 (December 10, 2021): 38–43. http://dx.doi.org/10.15407/publishing2021.60.038.
Full textAbstract:
The results of the study of overvoltages during arc single-phase earth faults of intermittent nature in the 35 kV electric network with isolated neutral are presented. Computer simulations of transients in the electrical network have obtained the maximum multiplicities of overvoltages at the point of occurrence of single-phase arc earth faults, which exceed theoretically expected according to known theories of the occurrence and development of overvoltages. The change of the overvoltage level on the 35 kV busbars of the network substations, electrically connected to the place of occurrence of the single-phase earth fault, and the influence of the cable line on the overvoltage multiplicity are shown. Ref. 12, fig. 3, table.
13
Buyakova, Natalia V., Andrey V. Kryukov, Dmitriy A. Seredkin, and Le Van Thao. "Simulation of Electromagnetic Fields Occurring at Intersection of Traction Networks and Multicircuit Power Lines." E3S Web of Conferences 209 (2020): 07002. http://dx.doi.org/10.1051/e3sconf/202020907002.
Full textAbstract:
Traction networks (TN) 25 kV generate higher electromagnetic fields (EMF) with frequency 50 Hz, whose strengths at a standardized height of 1.8 m, as a rule, do not exceed the permissible norms for electrical personnel. In places where railroads routes intersect with high voltage overhead power supply lines (OPL), interference of fields, generated by the traction network and OPL, occurs. This can lead to an increase in strengths and a complication of the EMF spatial structures. The article presents simulation results performed for a complex intersection, while 25 or 2 х 25 kV TN is crossed by a three-circuit 110-220 kV overhead power line at 90 degrees angle. Fazonord software application was used for simulating EMF strengths in points of traction networks and OPL intersection. Based on modeling results the following conclusions have been made: at intersection points of 1х25 kV traction network with a three-chain 110 - 220 kV power transmission line, the electrical field strength does not exceed the value acceptable for electrical personnel and reaches 4.2 kV/m; at the intersection with 2 х 25 kV traction network, this parameter decreases to 2.7 kV/m; the maximum amplitude of the magnetic field at the intersection points increases slightly.
14
Astashev, Mikhail G., Artem S. Vanin, Vladimir M. Korolev, Dmitriy I. Panfilov, Pavel A. Rashitov, and Vladimir N. Tulskii. "Assessment of the Technical and Economic Effect from Using Automatic Voltage Control Devices on 10/0.4 kV Transformers in Power Distribution Networks." Vestnik MEI, no. 5 (2021): 27–36. http://dx.doi.org/10.24160/1993-6982-2021-5-27-36.
Full textAbstract:
The article addresses the problem of ensuring permissible voltage levels in distribution electrical networks of various types: distribution networks of large cities, regional distribution electrical networks, and distribution electrical networks containing renewable energy sources. The most typical factors causing the voltage to go beyond the permissible limits specified by the relevant regulatory documents are pointed out. The negative factors conducive to the voltage at the consumer end deviating from the permissible limits, including a long length of network lines, high network load, low controllability of the network, load schedule nonuniformity, and poor observability of the network, are analyzed. The existing principles of voltage control in electrical distribution networks, namely, automatic and seasonal regulation, are studied. A distribution electrical network test model representing a real network fragment is developed. The model operation modes have been verified based on the data of measurements carried out in the original distribution electrical network. The voltage distributions in a medium voltage network during its operation under the conditions of the highest and lowest loads are demonstrated. It is shown, on the test model example, how the network voltage can be controlled by automatically regulating the voltage at the power supply center and selecting a fixed position of the NLTC at 10/0.4 kV transformer substations. It is shown that the use of power transformer OLTCs does not ensure sufficient means for adequately controlling the voltage in networks containing long power lines and featuring highly nonuniform seasonal and daily load schedules. The technical efficiency and economic feasibility of using automatic voltage regulation devices on 10/0.4 kV transformers for local voltage control are analyzed. The economic efficiency of applying automatic voltage regulation devices at 6--10/0.4 kV substations was evaluated in comparison with other means for improving the power distribution network voltage quality by upgrading the 10 kV feeder lines or installing a voltage booster at the inlet to the problematic 10 kV network section. The application field of automatic voltage regulators in the form of semiconductor devices for regulating the transformer output voltage at distribution transformer substations is shown.
15
Kovalenko, Viktor, Serhii Levchenko, Mykola Tryputen, Vitaliy Kuznetsov, Maksym Tryputen, Oleksiy Gorodny, Alisa Kuznetsova, and Yevheniia Kuznetsova. "CHARACTERISTIC LAYOUTS OF DISTRIBUTION NETWORKS WITH THE ANALYSIS OF VOLTAGE DEVIATIONS AND EXPEDIENCY OF ITS CONTROL." TECHNICAL SCIENCES AND TECHNOLOGIES, no. 3(17) (2019): 209–18. http://dx.doi.org/10.25140/2411-5363-2019-3(17)-209-218.
Full textAbstract:
Urgency of the research. It is well-known that electric energy characteristics are the levels of electromagnetic compatibility of electric grid providing adequate performance of any electrical means connected to the grid if the electric energy characteristics do not exceed permitted values. In the context of general idea of electromagnetic compatibility of consumers within power supply grids, power quality is the topical problem of modern electric-power supply industry. Target setting. The issue of assessing the possibility of ensuring the quality of electricity in terms of voltage deviation by consumers is very important. The problem of voltage fluctuations is relevant, so that voltage deviation have a negative impact on functioning electrical equipment Actual scientific researches and issues analysis. Papers [2-11] are devouted the effective management methods of electrical energy consumption. The articles [6-8] shows that under present conditions only system approach ensures accurate identification and prediction of electric power losses in distribution networks that are characterized by considerable ambiguity. Uninvestigated parts of general matters defining. Generalized diagram of the voltage modes characterizes the state for the entire distribution network connected to the main substation; it consists of the branched 10 kV network, all the distribution transformers, and all the 0.4 kV networks connected to those transformers. Along with the generalized diagram, values of the available voltage losses have been obtained; those values occur within 10 kV and 0.4 kV networks in terms of the favourable conditions of voltage control and the initial values of the admissible voltage deviations of electrical receivers. Moreover, that is the basis to determine operating position of control tappings of distribution transformers. The research objective. Since one of the important characteristics of electrical energy is the deviation of the voltage in the network, it is advisable to carry out its analysis in the urban distribution networks in terms of Levanevska substation, town of Zaporizhzhia. To simplify practical representation of possible voltage modes on the main substation buses and within the whole distribution networks, it is expedient to use graphic representation – so-called generalized diagram of voltage modes. That diagram helps make the analysis of voltage modes more demonstrative than analytical calculation; besides, the diagram gives great possibilities for further study. The statement of basic materials. While analyzing voltage mode in the distribution networks and determining the required law of voltage control in the main substation (MS), one should take into consideration great amount of factors effecting and complicating that study. Those factors include the following: changes in the operating mode of the network, differences in the points of connections of electrical receivers (ER) to the distribution network, differences in possible operating positions of the control tappings in the distribution transformers (DT), differences in the points of DT connections to 10 kV network, available dead zones of automatic voltage controller etc. Owing to that fact, it is required to perform generalized analysis of the voltage mode and conditions of its control within 10 kV and 0.4 kV distribution networks and on main substation buses. To do that, one should apply probabilistic calculation methods. At the same time, it is expedient to use graphic depiction (so-called generalized diagram (GD) of the voltage modes) to simplify representation of possible voltage modes on MS buses and within the whole distribution network. That diagram will help make the analysis of the voltage modes more clearly arranged than analytic calculations; moreover, it gives great opportunities for further study. Conclusions. Voltage deviation in the distribution networks has been performed and expediency of the voltage deviation control for electrically closest and farthest consumers have been analyzed in terms of Levanevska substation, town of Zaporizhzhia. Expediency of practical application of generalized diagrams for that purpose has been demonstrated. It has been defined that in the modes of maximum and minimum loads, voltage exceeds the admissible deviation norms of ± 5 %. Conclusion has been made on the expediency of more careful voltage control. Generalized diagram for 0-1 and 9-10 hours with the maximum voltage deviations has been constructed. Graph of dependences has been developed; formula of voltage deviations in the main substation, due to the voltage passing along that line, has been defined. According to the voltage data before and after the implementation of control, graphs of voltage deviations on the distribution transformer and in terms of the farthest consumer have been constructed.
16
Kuzmina, I. A. "Feasibility Assessment of Urban Electricity Distribution Networks Transition to the Voltage Level of 20 kV." Mechanical Engineering and Computer Science, no. 12 (January 4, 2018): 57–65. http://dx.doi.org/10.24108/1217.0001358.
Full textAbstract:
The article gives a feasibility assessment for increasing a voltage level of the urban electricity distribution networks from 6 and 10 kV to 20 kV.The emphasis is on the urban electricity distribution network in Moscow. It is noted that by now the reliability, efficiency and automation indicators of Moscow electrical grids are substantially lower than those of Europe, America, etc. The electrical grids in Moscow have a high wear and tear of equipment, a historically developed non-optimal structure, and a high loading level. In recent years, the situation has been significantly improved due to numerous government programs for the development of the electric power industry.It was noted that the high rate of development in Moscow resulted in a significantly increasing density of power loads. So modernisation of grids is a necessary-and-proper step to deliver electric power of good quality and in appropriate volume to all consumers. As the most promising option of such modernisation, the article’s proposal is to increase a voltage level of the electrical grid of medium voltage from 6 and 10 kV to 20 kV.The main advantages of the electrical grid transition to the higher voltage level is an increased power grid capacity and reduced losses of voltage and electric power when transmitting through the electrical grid elements. The article presents some calculations to prove decreasing several times losses in medium voltage cable lines. The shortcoming of the transition to an electrical grid of 20 / 0.4 kV is significant implementation costs, most of which will lead to increasing tariff for consumers.The experience of other countries examined in the article proves that increasing voltage level of the distribution network in Moscow and other megacities is expedient. At the same time, a gradual introduction of 20 / 0.4 kV substations to the electrical grid structure with a gradual unloading and elimination of 10 kV electrical grid elements is expected. The article appeals to successful experience available in the transition of large industrial enterprises to a voltage level of 20 / 0.4 kV.
17
Fursanov, M. I., A. A. Zalotoy, and V. V. Makarevich. "Calculation of Technological Consumption (Loss) of Electricity in Modern 0.38–10 kV Electrical Distribution Networks." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 61, no. 5 (October 4, 2018): 408–22. http://dx.doi.org/10.21122/1029-7448-2018-61-5-408-422.
Full textAbstract:
. New conditions of functioning of electric power industry, tougher of requirements to technological condition of the industry predetermined transition to restructuring of electric networks on the basis of innovative structure of SMART GRID. This leads to the improvement of traditional tasks of calculation and analysis of modes and technological consumption (loss) of electricity. The authors have developed a promising method of operational calculations of technical losses of electricity in modern electrical networks of 0.38–10 kV on the basis of telemechanical graphs of loads on the head sections of distribution lines, in the area of additional installation of digital metering devices and of sources of distributed generation. The method proposes a new technique for determining the flow of electric energy in the sections of distribution lines. This is done as follows. First, according to the data of additional measurements of the network and taking into account the calculated no-load losses of transformers, electricity flows are calculated in the head sections of 6–10 kV lines. Then, according to the obtained data and the measured values of the active and reactive energy graphs of the head sections, the electric power flows targeted for their subsequent distribution over all sections of the 0.38–10 kV network are determined, taking into account the load losses of electricity and the flow distribution coefficients. The distribution coefficients are the fractions of the calculated phase loads of the 0.38 kV network of their total value. Then, according to the obtained data and the measured values of the active and reactive energy graphs on the head sections, the electric power flows intended for their subsequent distribution over all sections of the 0.38–10 kV network are determined, taking into account the load losses of electricity and the flow distribution coefficients. The basic analytical relations concerning the estimation of losses and mode as well as an example of calculation of technological consumption (loss) of electricity in the general scheme of the distribution network of 0.38; 6 and 10 kV are given. The latter is performed for a single (first)stage of load graphs.
18
Zakharov, Sergei, Dmitriy Kudryashov, Viktor Brodt, Ivan Pascar, and Vyacheslav Voronin. "Analysis of Accidents in 6-110 KV Electric Networks of Kuzbass Power System." E3S Web of Conferences 41 (2018): 03015. http://dx.doi.org/10.1051/e3sconf/20184103015.
Full textAbstract:
Power system of the Kemerovo region is unique in terms of the number of hazardous production facilities (coal mines, coal pit). To ensure trouble-free operation of hazardous production facilities and the normal operation of other consumers, it is necessary to ensure reliable operation of regional electrical grid networks. Based on reports on technological disruptions in electric networks of the Kemerovo region in 2015, performed analysis of accidents in 6-110 kV electric networks of Kuzbass power system. The statistics of the technological disruptions in terms of voltage classes, damaged elements, causes of occurrence, time to recovery and the number of outages of household consumer, are given. Conclusions were drawn about the high level of accident rate in 6-10 kV electrical network.
19
Khomutov, Stanislav O., and Nikolay A. Serebryakov. "Creation of a short-term load forecasting neural network model of electrical engineering complex of section regional electric grid 6-35 kV." Transportation Systems and Technology 6, no. 1 (March 30, 2020): 80–91. http://dx.doi.org/10.17816/transsyst20206180-91.
Full textAbstract:
Aim: Is developing of short-term load forecasting math model of the electrical engineering complex of the district regional electric grid 6-35 kV with the use of artificial neural networks.
Methods: The tools of regression analysis and deep machine learning were used in the work.
Results: The neural network model for short-term load forecasting of the electrical engineering complex of section regional electric grid 6-35 kV, which considered factors of time, meteorological conditions, disconnections of individual power transmission lines, the operation mode of electricity consumers with a capacity of over 670 kW, the fact of the availability of central heating and water supply, has been obtained.
Conclusion: The developed neural network math model reduces the problem of short-term load forecasting to the search of matrix free coefficients through training on the available statistical data.
20
Golikov, I. O., A. V. Vinogradov, V. E. Bolshev, A. V. Vinogradova, M. Jasinski, and R. R. Gibadullin. "Structure of many-level adaptive automatic voltage regulation system." E3S Web of Conferences 178 (2020): 01068. http://dx.doi.org/10.1051/e3sconf/202017801068.
Full textAbstract:
This article describes the features of voltage regulation in electrical networks of 35, 110, 220 kV. The structural diagram of the 35/10/0.4 kV network is presented. The paper also describes the adaptive automatic voltage regulation system which allows regulating the voltage taking into account the actual voltage values at the consumers’ inputs. The structural diagram of the adaptive automatic voltage regulation system in the 0.4 kV electrical network using a boost transformer as an additional means of voltage regulation is given. The system is based on voltage sensors installed in different parts of an eletcrical network sending information on voltage values to to the processing unit which generates a signal for voltage regulating supplied to the executive device and the working body whuch, in turn, change the on-load tap-changer position of a transformer. The paper justifies the need for the enhancement of the adaptive automatic voltage regulation system for different voltage classes wich allows controlling a voltage change at different power supply system levels and regulating voltage level in accordance with this change. For this problem the multi-level adaptive automatic voltage regulation systemis proposed. The system allows regulating the voltage not only in the 0.4 kV network but also in networks of higher voltage classes. The proposed system can be integrated into the structure of intelligent electrical networks.
21
SHEINA, A., and S. SKRYPNYK. "Comparison of technological losses of 6 (10) kV and 20 kV electrical network." Journal of Electrical and power engineering, no. 1 (2019): 64–69. http://dx.doi.org/10.31474/2074-2630-2019-1-64-69.
Full text
22
TIUTIUNNYK, N., and G. SHEINA. "Analysis of voltage regulation devices." Journal of Electrical and power engineering 23, no. 2 (December 23, 2020): 44–47. http://dx.doi.org/10.31474/2074-2630-2020-2-44-47.
Full textAbstract:
The paper considers an electrical substation with a voltage of 330/110/35 kV. Means of voltage regulation on the substation autotransformer are investigated. The paper considers the means of voltage regulation on autotransformers of the 330/110/35 kV substation to ensure uninterrupted power supply and the desired voltage level on the busbars of consumers. The choice of the optimal version of the on-load tap-changer of the autotransformer is shown. The electric network with voltage of 110 and 35 kV is considered. The power supply center is substation 330 kV. The connection between voltages is provided by three three-phase autotransformers of the ATDCTN200000/330/110 type. Autotransformers are used instead of three-winding transformers to reduce the cost of conductive material and increase transmission power, but unlike three-winding transformers, they have only one voltage control device - load control regulation. Steady-state and emergency modes are investigated. The PowerFactory program has created a network model, which is used to calculate the mode and evaluate the methods of voltage regulation. On the basis of calculations the point of economic flow distribution in which it is expedient to open a network in a normal mode, and on the switch to provide the device of automatic input of a reserve is defined. The principles of control of modes of operation of electrical systems are investigated: minimum costs for generation, transmission and consumption of electricity (technological losses), reliability of operation of electrical systems, quality of electricity. The purpose of this work is to substantiate the optimal operational scheme of the electrical network, the study of the modes of operation of the 330/110/35 kV network. The simulation of steady and emergency modes is performed in the work. The optimal operational scheme of the electric network is substantiated in order to improve the reliability of power supply and ensure the desired level of voltage on the busbars of consumers.
23
Naumov, I. V., and S. V. Podyachikh. "On the choosing the installation location the balancing devices in low-voltage distribution electric networks." Journal of Physics: Conference Series 2094, no. 5 (November 1, 2021): 052012. http://dx.doi.org/10.1088/1742-6596/2094/5/052012.
Full textAbstract:
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.
24
KAMOLOV, Mukhammadzhon М., Sagid A. АBDULKERIMOV, Khurshed B. NAZIROV, Shokhin D. DZHURAEV, and Saidjon Т. ISMOILOV. "Consideration of Nonsinusoidal/Unbalanced Operating Conditions of a Municipal Electric Network for Calculating the Current Level through the Neutral Conductor." Elektrichestvo 1, no. 1 (2021): 35–43. http://dx.doi.org/10.24160/0013-5380-2021-1-35-43.
Full textAbstract:
During the operation of 0.4 kV electric networks, asymmetry of currents and voltages is unavoidable. As is known, unbalanced operation of 0.4 kV networks is stemming from nonuniform distribution of loads between the phases. This results in that a fundamental frequency zero-sequence current will flow through the neutral conductor in a four-wire three-phase electric network. On the other hand, during balanced operation of a four-wire electric network containing loads with a nonlinear volt-ampere characteristic, higher harmonic currents multiple to three are summed in the neutral conductor. Therefore, it is of relevance to analyze unbalanced operating conditions of a four-wire electric network containing loads with a nonlinear volt-ampere characteristic. The article presents the characteristics of a municipal load for analyzing unbalanced/nonsinusoidal conditions of its operation. For carrying out full-valued assessment of unbalanced operating conditions of a four-wire electric network, a simulation model of a 0.4 kV network section containing a nonsinusoidal load is developed. It is shown that during unbalanced operation of an electric network containing electric loads with a nonlinear volt-ampere characteristic it is recommended to take into account zero-sequence current higher harmonic components that are not multiple to three. An algorithm for calculating the neutral conductor current harmonic component for determining the cable temperature rating is developed.
25
CRUCITTI, PAOLO, VITO LATORA, and MASSIMO MARCHIORI. "LOCATING CRITICAL LINES IN HIGH-VOLTAGE ELECTRICAL POWER GRIDS." Fluctuation and Noise Letters 05, no. 02 (June 2005): L201—L208. http://dx.doi.org/10.1142/s0219477505002562.
Full textAbstract:
Electrical power grids are among the infrastructures that are attracting a great deal of attention because of their intrinsic criticality. Here we analyze the topological vulnerability and improvability of the spanish 400 kV, the french 400 kV and the italian 380 kV power transmission grids. For each network we detect the most critical lines and suggest how to improve the connectivity.
26
Arizaldi, Afif, S. Salahuddin, M. Muhammad, Vishal Jain, Govinda Prashad Pandey, and Manoj Jagannathrao Watane. "Short Circuit Analysis on Distribution Network 20 kV Using Etap Software." Journal of Renewable Energy, Electrical, and Computer Engineering 1, no. 2 (September 30, 2021): 49. http://dx.doi.org/10.29103/jreece.v1i2.5232.
Full textAbstract:
In an electric power system, electricity is generated by the power plant and then channeled to a transmission line and then distributed to consumers, in the process of distributing electrical energy, the system does not always work in normal conditions, sometimes the system can experience disturbances such as one-phase, two-phase, and three-phase disturbances. This interference can disrupt the electrical system and can damage equipment if left unchecked, therefore it is necessary to install a protection device that can decide the interference so as not to damage other equipment when a disturbance occurs. Here the protection device used is a circuit breaker. In a fault condition, the circuit breaker must be able to separate the points of the fault so as not to damage other electrical equipment. In this case, to determine the capacity of the best protection device for the system, a short circuit fault simulation is performed. To simplify the calculation process here the author uses the help of ETAP software (Electrical Transient Analysis Program).
27
Kachanov, Alexander Nikolaevich, Vadim Alekseevich Chernyshov, Boris Nikolaevich Meshkov, Marsel Sharifyanovich Garifullin, and Evgeny Alexandrovich Pechagin. "Improving the functioning efficiency of 6-10 kV electrical networks with isolated neutral in conditions of single-phase ground faults." E3S Web of Conferences 288 (2021): 01010. http://dx.doi.org/10.1051/e3sconf/202128801010.
Full textAbstract:
The main objectives of this publication are: 1) to attract the attention of energy specialists to the problems of reliability and electrical safety of 6-10 kV overhead electrical networks with isolated neutral, operating in conditions of single-phase insulation damage; 2) substantiation of the feasibility of introducing a fundamentally new way to improve the efficiency of 6-10 kV distribution networks, based on the resonanceless limitation of the single-phase ground fault current arising from the breakdown of the insulator and the use of its own infrastructure of the electrical network for remote identification of the place of its occurrence. The expediency of including a nonlinear surge suppressor between the traverse and the grounding outlet of the reinforced concrete support is confirmed by the positive results of experimental studies carried out on the basis of high-voltage testing laboratories of IDGC of Center PJSC - Orelenergo and EnerGarant LLC. The use of deductive analysis allowed the authors to select a reliable and affordable electrical insulating material installed between the support and the traverse, as well as to formulate the main requirements for it, including taking into account weather and climatic factors. The analysis of various methods of transmitting information about the place of occurrence of the insulator damage made it possible to establish the predominant advantage of a wired communication channel using its own 6-10 kV electric network infrastructure. The authors have developed an original circuitry solution that provides remote identification of the insulator damage location using a thyristor shunting the nonlinear surge suppressor, according to a given switching algorithm, and also provides local identification of the insulator breakdown by means of special signaling devices with volatile power supply. It is expected that the proposed method, with relatively low investment, will significantly reduce the level of accidents and electrical hazards in overhead distribution networks of 6-10 kV, as well as minimize the costs associated with their operation and undersupply of electrical energy.
28
Lutsenko, Ivan, Sergey Fedoriachenko, Andrey Malienko, Natali Rukhlova, Evgen Koshelenko, Pavel Tsyhan, and Anton Kholodov. "Estimation of the potential of energy efficiency increase in SMARTGRID systems with prosum-ers based on electric vehicles." Bulletin of Kharkov National Automobile and Highway University, no. 95 (December 16, 2021): 241. http://dx.doi.org/10.30977/bul.2219-5548.2021.95.0.241.
Full textAbstract:
The modes of operation of power transformer substations 6 (20)/0.4 kV are analyzed. Scientific and technical solutions for the use of electric vehicles as prosumers of electric energy are substantiated. The potential influence of electric cars on electricity losses in "smart" electric networks is determined. Feasibility study of expediency of using electric mobiles as prosumers from the standpoint of loss reduction and efficiency of network equipment use is given. Quantitative indicators of the potential of equalization of the daily schedule of electric loads of the typical area of consumers of city electric networks are determined. The main indicator is the reduction of electricity losses in transformers by 7-10% compared with the existing ones when regulating the mode from the side of 0.4 kV with help of electric vehicles. Additionally, the possibility of increasing the capacity of electrical networks up to 45% identified.
29
Nadtoka, Ivan, Pyotr Osadchy, and Vladimir Tropin. "Analysis of Circuit Solutions for the Modernization of Distribution Networks for Housing and Communal Services." Известия высших учебных заведений. Электромеханика 64, no. 3 (2021): 75–84. http://dx.doi.org/10.17213/0136-3360-2021-3-75-84.
Full textAbstract:
The article presents the results of the analysis of the main stages of the development of electric networks for housing and communal services (HCS) since the 50s of the last century and ending with the latest innovative developments, which are both at the stage of theoretical research and experimental tests in pilot projects implemented in existing networks. It is noted that the traditional 10(6)/0.4 kV structure with a dead-earth neutral on the low-voltage side, which is used both in industrial and utility networks, has disadvantages associated with increased power losses, as well as the need to use special technical means to ensure the required quality of electricity. It is shown that with the average value of the reverse sequence current coefficient equal to 0.3, the relative value of additional power losses in the low-voltage line from the presence of current in the neutral wire can reach 36% of the total amount of additional losses. The review and analysis of the four most promising areas of modern research, innovative developments and experiments on the structural optimization of utility networks is given: a network with an increased voltage of 6(10; 35) kV and a reduced voltage of 0.4 kV with an isolated neutral; a network with an increased voltage of 6 (10; 35) kV and a reduced voltage of 0.4 kV with an isolated neutral; 0,95/0,4 /0,23 A network with two levels of high voltage of 1.14 (0.66) kV and a reduced line voltage of 0.23 kV with a grounded neutral of transformers; Fundamentally new methods of transmitting electricity over a single wire at alternating and direct current of increased voltage are described. The necessity of choosing the most rational integrated circuit solution for the structure and schemes of utility networks, which will reduce the loss of electricity in the networks, improve the quality of electricity and electrical safety, is justified.
30
Bassam, Fadel, and Andrey Kryukov. "DIGITAL MODELS OF DISTRIBUTION ELECTRIC NETWORK OF IRAQ." Modern Technologies and Scientific and Technological Progress 2020, no. 1 (June 16, 2020): 187–88. http://dx.doi.org/10.36629/2686-9896-2020-1-187-188.
Full textAbstract:
The restoration and development of Iraq's electric power industry is planned to be carried out on the basis of the concept of intelligent electric networks (smart grid). To implement this concept, it is necessary to create integrated digital models of electrical networks. Such models can be implemented on the basis of methods and tools for modeling electric power systems in phase coordinates. The report presents the results of modeling normal and emergency modes of distribution electric networks of 11 kV.
31
Vinogradov, Alexander, Alina Vinogradova, Vadim Bolshev, and Alexander Ivanovich Psarev. "Sectionalizing and Redundancy of the 0.38 kV Ring Electrical Network." International Journal of Energy Optimization and Engineering 8, no. 4 (October 2019): 15–38. http://dx.doi.org/10.4018/ijeoe.2019100102.
Full textAbstract:
The use of power line sectionalizing and power line redundancy in 0.38 kV networks entails the need to take into account the fact that currents and voltages can vary significantly at different points of the network. The article proposes a mathematical model to solve this problem. The mathematical model is based on the method of phase coordinates. Using mathematical modeling, the article determines the voltages and currents in the sections of the backup line after the automatic load transfer switch is activated. The article also proposes an improvement in the scheme of the power line sectionalizing unit. The sectionalizing unit scheme is suggested to be modified with a bypass circuit and the installation of a voltage indicator for signaling the voltage presence on the lower contacts of the switch.
32
Kovalyov, Aleksandr, Sergei Soleniy, and Oksana Solenaya. "Development of Electric Current Sensor for the Device Protecting Electrical Wiring against Sparks." Materials Science Forum 856 (May 2016): 337–42. http://dx.doi.org/10.4028/www.scientific.net/msf.856.337.
Full textAbstract:
The paper is devoted to the development of electrical current sensor, comparable with one pole of protective-switching apparatus of electric network for the voltage up to 1 kV. It is defined, that variation of mass, dimensions and electrical characteristics of the sensor generates a nominal row of currents of the device, protecting from sparks.
33
Klimenko, Yu A., and A. P. Preobrazhensky. "Development of an Adaptive Module for Control of Energy Supply of the Consumer in the Distributive Electrical Network 0,4 kV for Elimination of the Phase Load Unsymmetry." E3S Web of Conferences 209 (2020): 07005. http://dx.doi.org/10.1051/e3sconf/202020907005.
Full textAbstract:
The paper considers the possibility of modeling the process of controlling the power supply of the consumer in the lower levels of network organizations to improve the quality indicators of electrical energy in the distribution electrical networks of 0.4 kV. The analysis of the process of control of indicators of the quality of electricity in the supply of energy to consumers. The block diagram of the adaptive power supply control module of the consumer and the algorithm of the control process are presented. A consumer power supply control module in 0.4 kV distribution networks is proposed.
34
Mnukwa, Siphokazi, and Akshay Kumar Saha. "Electrical Load Flow Analysis of 132/33/11 kV Port of Durban’s Substation." International Journal of Engineering Research in Africa 51 (November 2020): 79–93. http://dx.doi.org/10.4028/www.scientific.net/jera.51.79.
Full textAbstract:
The Port of Durban (PoD) is currently upgrading its existing power supply to a supply voltage of 132 kV. The existing 33 kV supply cables are old and have exceeded their designed life resulting in unplanned power outages. The existing 33 kV switchgear is old and obsolete as a result it is difficult to maintain. The existing maximum demand capacity will not be able to cater for the additional loads required for the planned expansion developments.The electrical load flow is a very important and fundamental tool for the analysis of any power systems and in the operations as well as planning stages. The electrical load flow study was conducted using PowaMaster software to analyse the behaviour of PoD’s electrical network post implementation of the new substation onto the currently existing network. In performing the electrical load flow study, load diversification is one of the critical input parameters that was considered because it is a true representation of the network behavior. The load forecasting was based on the planned developments commissioned between 2017 and 2027. The electrical load flow study was also to validate if all the new selected reticulation cables and transformers as part of the design have been correctly sized and will be able to operate reliably without compromising security of firm supply with the implementation of all the planned future loads. This report entails the results of the electrical load flow study that was conducted to analyse the voltage stability and system reliability of the PoD’s electrical network in conjunction with new 132/33 kV Langeberg Substation.
35
Klyuev, R. V., I. I. Bosikov, O. A. Gavrina, and V. I. Lyashenko. "Improving Safety and Efficiency of Power Supply to Ore Mining Sites at the High Mountain Mine." Occupational Safety in Industry, no. 1 (January 2022): 7–13. http://dx.doi.org/10.24000/0409-2961-2022-1-7-13.
Full textAbstract:
The results of study in the field of improving safety and efficiency of power supply to ore mining sites at a high mountain mine are presented. It is shown that safety and efficiency of power supply, as well as the hazard of electric shock in the electrical installations with a voltage of 6 kV, largely depends on the number of single-phase earth faults. It is established that high earth fault currents make it necessary to compensate for capacitive currents in 6 kV networks by installing compensating (arc-quenching) reactive coils. This will allow to reduce the ground fault currents to 3–5 A, increase the network insulation impedance by a factor of 4–6, reduce the over-voltages in the undamaged phases during ground faults, and improve conditions of ensuring electrical safety. It is substantiated that at the sections of the cable network leading to substations 25, 26, 28 and «Stvol», the resistance level is higher than the average for the high mountain mine, and in the sections of substations 31–35 and substation 33 it is slightly lower than the average. The worst state of insulation (maximum leaks) is observed at the sections of substations 31–106 and 31–34, where the insulation level is lower than the average by 16.6 and 3.56 times, respectively. It is recommended to carry out a preventive check of not only the condition of the cable, but also cable couplings, equipment at substations 31, 34 and 106 at these sites. And in the future, to continue study on high earth fault currents in the absence of control over the continuity of the earth network. Recommendations are given to improve the operation of electrical networks, to make fuller use of existing networks, and to ensure safe conditions for the maintenance of electrical installations of the networks with a voltage of 6 kV of the high mountain mine.
36
Shaqiri, Rexhep. "Reducing the Losses in the Electrical Power System of Kosovo by Implementation of New Type of Transformers in the Power Distribution System." Materials Science Forum 856 (May 2016): 331–36. http://dx.doi.org/10.4028/www.scientific.net/msf.856.331.
Full textAbstract:
This paper contains a strategy to minimize the power losses in the electrical distribution network of Kosovo. In order to develop the strategy, a model was constructed to simulate an electrical distribution network, and different parameters were included that helped in estimation of the technical power losses in the medium voltage (MV) distribution network. The main objective of this paper is to present approach to minimize technical and non-technical losses in power systems. The analysis of the Kosovo electric power system was performed by means of PSS/E 3.3 software. The results indicate options for reduction of the loses by replacement of old type of transformers and preparation of the MV system for upgrade and change the voltage level from 10 kV to 20 kV. As a first step new 110/10kV transformers can be installed, designed to be reconnected in the future to 110/20kV.
37
Gulakhmadov, Aminjon, Salima Asanova, Damira Asanova, Murodbek Safaraliev, Alexander Tavlintsev, Egor Lyukhanov, Sergey Semenenko, and Ismoil Odinaev. "Power Flows and Losses Calculation in Radial Networks by Representing the Network Topology in the Hierarchical Structure Form." Energies 15, no. 3 (January 21, 2022): 765. http://dx.doi.org/10.3390/en15030765.
Full textAbstract:
This paper proposes a structured hierarchical-multilevel approach to calculating the power flows and losses of electricity in radial electrical networks with different nominal voltages at given loads and voltages of the power source. The researched electrical networks are characterized by high dimensionality, dynamism of development, but also insufficient completeness and reliability of state information. The approach is based on the representation of the initial network graph in the form of a hierarchical-multilevel structure, divided into two stages with rated voltages Unom≤35 kV and Unom≥35 kV, and using the traditional (manual) engineering two-stage method, where the calculation is performed in a sequence from bottom to top (stage 1) and from top to bottom (stage 2), moving along the structure of the network. The application of the above approach makes it possible to obtain an algorithm for implementation on a computer, which is characterized by universality (for an arbitrary configuration and complexity of the network), high performance and low requirements for the computer memory.
38
Kudryashev, Gennadiy, Aleksandr Tret’yakov, and Oksana Shpak. "The Impact of Electricity Losses on the Reliability of Electrical Equipment in the Rural Power Grid of 0.4 kV." Elektrotekhnologii i elektrooborudovanie v APK 1, no. 42 (January 2021): 34–38. http://dx.doi.org/10.22314/2658-4859-2021-68-1-34-38.
Full textAbstract:
Rural networks are characterized by a large length and low load density. In the country, there are problems with the reliability of electricity supply to agricultural enterprises and the uninterrupted operation of electrical equipment. The average duration of consumer outages is up to 100 hours annually. In Western developed countries, it is statistically defined as an acceptable state of electricity supply, when for a medium- voltage network during the year, the total duration of interruptions is in the range of 15-60 minutes per year. The permanent functioning of the Russian agro-industrial complex is impossible without reliable and stable operation of rural electric distribution networks. (Research purpose) The research purpose is in studying the impact of electricity losses on the reliability of electrical equipment in the rural power grid of 0.4 kilovolt. (Materials and methods) The methods of ensuring reliability include: design features of the system, reliability of electrical equipment; provision of backup power, system management tools, organization of operation. The reasons for the decrease in reliability were: equipment failures, errors of operating personnel, excess of resource capabilities, deviation of the actual operating conditions of the equipment from the calculated ones. (Results and discussion) The article considers the issues of additional electricity losses in the low- voltage network of 0.4 kilovolts on the example of the power supply of an agricultural enterprise, caused by the flow of reactive energy. The article presents graphs of phase voltages and power consumption. Authors conducted experimental studies in a network of 0.4 kilovolts. The article presents the calculated reliability indicators of electrical equipment at an agricultural enterprise. The increase in reliability when installing a compensating device in the 0.4 kilovolt network are described. (Conclusions) The increase of reliability of electrical equipment is revealed, the probability of failure operation of the electric motors decreased by 3 percent; the probability of failure operation of the electric motors decreased by 19 percent; reducing the failure rate by 15 percent; decrease in failure rates by 14 percent.
39
Shelekh, Yurii, Myroslav Sabat, Vladyslav Lysiak, and Lidija Parashchuk. "Enhancing safety and reliability of electric power supply to consumers through safe electricity networks of up to 1 kV." Energy engineering and control systems 7, no. 2 (2021): 97–102. http://dx.doi.org/10.23939/jeecs2021.02.097.
Full textAbstract:
The study presents an electric network that allows both increasing the level of electrical safety and eliminating one-phase damage to the electrical network without switching off the consumer's electric energy. The application of the network does not require significant investments. The technical feasibility of implementing an electrical installation with voltage values in the emergency mode on the leading parts, which does not exceed the permissible values for normal mode, is demonstrated. An additional advantage of the proposed technical solution is the immutability of the voltage at the customer's outputs, which allows it to operate normally also in the emergency mode of the electrical installation.
40
KLYUEV, R. V., V. I. GOLIK, I. I. BOSIKOV, and O. A. GAVRINA. "DEVELOPMENT OF METHODS FOR ENSURING ELECTRICAL SAFETY OF ELECTRIC NETWORKS OF QUARRIES." News of the Tula state university. Sciences of Earth 3, no. 1 (2020): 74–91. http://dx.doi.org/10.46689/2218-5194-2020-3-1-74-91.
Full textAbstract:
The paper presents the results of a study of the state of isolation of quarry networks with a voltage higher than 1000 V, which is a mandatory requirement for periodic inspection of all electrical devices and equipment at mining enterprises to ensure electrical safety. A method of comparative assessment of the isolation level of quarry networks has been developed, which includes a number of parameters as input data, such as the total length of electrically connected cable and overhead lines, respectively, the number of excavators, transformer substations and switch points in the quarry network. The method allows you to compare the average total conductivity of individual, newly introduced network elements or the average total conductivity of the modified network as a whole with the actual conductivity of the quarry network as a whole, developed over the entire period of operation of the quarry. The paper presents practical results of the study of the state of isolation of individual sections of the 6 kV network of the quarry, allowing for their comparative analysis using an accurate method that takes into account all the parameters of the electrical network and a simplified calculation method, taking into account the allowed 10% error in determining the equivalent length of the cable network. The obtained results can be used in the analysis of insulation condition of the electrical network at the various enterprises of the mining industry.
41
Mikheev, Georgi M., and Ayrat G. Ziganshin. "THE ABILITY OF MODERN TECHNOLOGIES TO INFLUENCE THE NEUTRAL MODE OF ELECTRIC GRIDS." Vestnik Chuvashskogo universiteta, no. 3 (September 29, 2021): 103–12. http://dx.doi.org/10.47026/1810-1909-2021-3-103-112.
Full textAbstract:
In this article, we consider the modes of neutrals of 0,38 to 750 kV networks. In any network with different voltage classes, the neutral point of a power transformer winding can operate both in isolated and deaf earthed mode. However, the choice of this mode depends on economic feasibility.
The paper presents arguments and advantages of application of system with isolated and compensated neutral of networks with voltage classes 6–35 kV. For networks of these voltage classes various options of connecting arc suppression reactors with step and smooth regulation, as well as low and high impedance resistors in the neutral point of neutralizing transformer or zero sequence filter are considered. On the example of operation of electric networks of the Republic of Chuvashia for many decades it is emphasized that compensation of capacitive currents with arc suppression reactors is an effective and reliable way to protect not only substation electrical equipment from overvoltage, but also to ensure electrical safety of people and animals, as well as reinforced concrete towers from destruction.
It is noted that the 6–35 kV networks in the future can be made with deaf earthed neutral. However, this will be possible under the condition that self-supporting insulated wires will be installed on overhead transmission lines instead of bare wires, and cross-linked polyethylene cables will be used on cable lines. It is emphasized that the introduction of work under voltage in 6-35 kV networks and digitalization of substations with the widespread introduction of microprocessor technology will accelerate the transition from a system with insulated (or compensated) neutral to a deaf earthed system. Nevertheless, the decision to switch from the insulated neutral system to a deaf earthed system will remain the prerogative of the design organization based on the specifics of the electrical equipment and the sphere of industrial activity.
42
Buslov, Viktor V., and Nailia Sh Chemborisova. "The Static Characteristics of Modern Load Types and Their Influence on the Electric Network Operating Modes." Vestnik MEI 2, no. 2 (2021): 20–28. http://dx.doi.org/10.24160/1993-6982-2021-2-20-28.
Full textAbstract:
One of the main aims pursued in conducting a power system operating mode is to maintain the normal voltage level at the control points of the power system and at its consumers. The voltage operation parameters in the electric network must meet the requirements of Russian State Standard (GOST) 32144‑2013 in regard of permissible voltage deviations for electric energy consumers who are powered from this network. In addition, it is desirable for the consumer to have an optimal voltage level at which the costs for producing a unit of goods are kept to a minimum. Each load is characterized by different active power consumption and reactive power absorption as a function of voltage, which leads to changes in the network operating parameters. Thus, in studying the electric power system operating modes, it is necessary to take into account the load static voltage characteristics. In this study, the electrical regimes were numerically analyzed (using the RastrWin3 software package), the Jacobi matrix was calculated, and the resulting data array was approximated using the Gauss, Cramer, and numerical methods. The distribution of power consumption in an individual house/apartment is determined; modern equations for the static characteristics of domestic loads for an individual house/apartment and for load nodes belonging to the 6-20 kV and 110-220 kV voltage classes are derived, and standardized node sensornet lists for different electrical networks are calculated. The study results can be used in designing modern electrical networks, in optimizing the network operating modes, and in settling operational dispatch control matters. It has been proven based on the results from comparing the obtained equations of static load characteristics with the typical ones that the introduction of energy saving technologies and the use of modern types of electrical appliances generate the need to change the typical static load characteristics. The necessity of representing the load at nodes by full models of static load characteristics is shown.
43
Dris, Mida, and Benattous Djilani. "Hybrid System Power Generation'wind-photovoltaic' Connected to the Electrical Network 220 kV." International Journal of Applied Power Engineering (IJAPE) 7, no. 1 (April 1, 2018): 10. http://dx.doi.org/10.11591/ijape.v7.i1.pp10-17.
Full textAbstract:
Renewable energy have the potential to generate electricity cleanly without pollution and a lesser dependence of resources for this production of electric power by these systems sources such as solar, wind, hydro, geothermal and biomass instead anti-environmental conventional systems such as gas, coal and oil is a remarkable idea but not frequent in Algeria. Our research focuses on the study of a hybrid energy system (Photovoltaic-Wind), connected to the Electrical Network 220 kV and this by tracking the maximum power point (MPPT) for two energy sources. For this, methods based on optimization algorithms were used side PV array and Wind turbine. With regard to the wind turbine, optimization was based on an analytical approach method. The Matlab/Simulink is used for simulated power output from Hybrid System, power delivered to or from grid and phase voltage of the inverter leg
44
El-Sayed Gouda, Osama, and Noura Ahmed Elshesheny. "Simulation of the Lightning Back-Flashover for Medium Voltage Distribution Network." Indonesian Journal of Electrical Engineering and Computer Science 3, no. 2 (August 1, 2016): 264. http://dx.doi.org/10.11591/ijeecs.v3.i2.pp264-272.
Full textAbstract:
Lightning strikes represent a considerable cause of short interruptions in electrical overhead line networks. The over voltages caused by lightning cannot be avoided but their influence can be limited by appropriate over voltage protection. This paper presents analysis study on some factors affecting the back flashover of Egyptian 66 kV distribution lines using Alternative Transient Program (ATP). The study includes the modeling of 66 kV distribution lines, the effects of magnitude and the front and tail times of lightning wave on the back flashover voltages, the effects of the striking distance, and the using of counterpoise wires on the back flashover on the 66 kV line towers. In this paper the 66 kV lines sag is neglected and the soil ionization by the flow of the stroke current is considered.
45
Suzuki, Mamoru, Takayuki Matsuda, Keizou Inagaki, Hiroshi Sasaki, Masaji Usui, and Masao Hori. "Study of 1000-kV network protection." Electrical Engineering in Japan 115, no. 4 (June 15, 1995): 42–59. http://dx.doi.org/10.1002/eej.4391150404.
Full text
46
Dicki, Dimas Aditia, and Winarso Winarso. "Prakiraan Beban Puncak Pada Transformator GITET 150 kV Kesugihan Cilacap Menggunakan Jaringan Syaraf Tiruan Multilayer Feedforward Dengan Algoritma Backpropagation." Proceedings Series on Physical & Formal Sciences 1 (October 31, 2021): 8–16. http://dx.doi.org/10.30595/pspfs.v1i.127.
Full textAbstract:
The increasing population and the growth of the industrial world, offices, hotels, and modern markets must be directly proportional to Indonesia's availability of electrical energy. The availability of sufficient electrical energy can affect the quality of life of the people and foster investor confidence in our country. Studies on the prediction (estimation) of peak electrical loads in electricity in Indonesia can be carried out using the Artificial Neural Network (ANN) method. The estimation of electricity load for the next 5 years is strongly influenced by several parameters, including population growth and peak load data of 150 kV GITET, Kesugihan Cilacap. This study took population data and peak load data at GITET 150 KV Kesugihan Cilacap in the past 5 years. The data used in this study were actual data, starting from 2015 to 2019. To display the results of the estimated electrical load on the 150 kV GITET transformer, the authors used the artificial neural network method. The peak electrical loads estimation results using artificial neural networks for electricity loads in the next 5 years, to wit from 2020 - 2024. The estimated peak load in Lomanis District is20.0311 MW, 24.443 MW, 19.9707 MW, 19.9705 MW and 19, 9705 MW. In Gombong District, the estimated peak load is 57,398 MW, 57,472 MW, 57,476 MW, 57,474 MW, and 57,479 MW.
47
Taiwo, Ogunboyo Patrick, and Melodi O. Adegoke. "Electrical Distribution Industry - Long Term Load Forecast on Ilesha Road 11kV Feeder, Akure, Ondo State, Nigeria." International Journal of Engineering Research in Africa 37 (August 2018): 52–61. http://dx.doi.org/10.4028/www.scientific.net/jera.37.52.
Full textAbstract:
This paper presents an investigative study on a selected 11 kV distribution feeder network in Akure township, Nigeria, aimed at evaluating power distribution problems and solution proposals for effective application of existing 11 kV feeders for power supply within Nigeria. Based on peak loads recorded on the feeder for 8 years a long term load forecast up to 2021 was carried out using “Trend’ and “Growth’ functions in Excel worksheet. These functions use Method of Least Squares. The peak network load is 8 MW and the expected load in 2021 is 14.5 MW (18.5 MVA at 0.8 power factor) after an exponential growth rate of 0.6 MW per annum. There is need to increase the rating of the power transformer feeding the feeder in order to enhance the security power supply to the network. Furthermore, the Power Company must provide standard input voltage (1.05x11 kV) to the network in order to normalize end-users voltage quality.
48
Орлов, П. С., and О. Н. Круду. "Full-phase Voltage Restorer in a Four-wire Circuit of 0.4/0.23 kV when one of the 6 (10) kV Supply Phases of the Transformer Breaks." Vestnik APK Verhnevolzh`ia, no. 1(53) (March 30, 2021): 82–86. http://dx.doi.org/10.35694/yarcx.2021.53.1.014.
Full textAbstract:
Рассмотрены проблемы повышения надёжности электроснабжения потребителей и снижение электротравматизма в электроустановках. При обрыве одной из питающих фаз силового трансформатора напряжением 6(10) кВ созданное авторами устройство восстановления полнофазного напряжения в четырёхпроводной сети 0,4/0,23 кВ позволяет восстановить питающее напряжение. Это достигается использованием уникальных свойств аналоговых устройств – трёхфазных электрических сетей и трёхфазных силовых трансформаторов с первичной и вторичной обмотками, включёнными по схеме «звезда с нулём - звезда с нулём», запитанных от четырёхпроводной сети. При утрате питания от любого одного из четырёх питающих проводов за счёт неразрывности магнитных потоков и обратимости электрических машин автоматически (после физического отключения утраченной фазы) устройства восстанавливают полнофазное напряжение в первичной и во вторичной обмотках трансформатора. The problems of increasing reliability of power supply to consumers and reducing electrical injuries in electrical installations are considered. When one of the supply phases of a 6 (10) kV power transformer breaks, the full-phase voltage restorer in a 0.4/0.23 kV four-wire network created by the authors allows restoring the supply voltage. This is achieved by using the unique properties of analog devices – three-phase electric networks and three-phase power transformers with primary and secondary windings, connected according to the scheme "star with zero – star with zero" powered from a four-wire network. When power is lost from any one of the four supply wires due to the continuity of magnetic flows and the reversibility of electrical machines, the devices automatically (after physically disconnecting the lost phase) restore full-phase voltage in the primary and secondary windings of the transformer.
49
Zalesova, O. V. "Determination of Electromagnetic Influence of 25 kV AC Electric Traction Network on 10 kV High-Voltage Overhead Line." Journal of Physics: Conference Series 2096, no. 1 (November 1, 2021): 012078. http://dx.doi.org/10.1088/1742-6596/2096/1/012078.
Full textAbstract:
Abstract Electrified railways include a system of cable and overhead lines. An analysis of the operation of alternating current (AC) electrified railways sections shows that the value of the induced voltage caused by the operation of the traction network can significantly exceed the permissible level on adjacent disconnected high-voltage overhead lines. As a consequence, this leads to serious injuries to operating personnel, including deaths, failure of electrical equipment. From this point of view, 1x25 kV 50 Hz AC railway system networks are considered the most dangerous. The electromagnetic influence of the traction network of a double-track section of an AC railway on an adjacent 10 kV high-voltage overhead line for power supply of automatic block signalling is investigated in the offered paper. Emergency cases of traction network operation are considered: short-circuit situation and forced state. The calculations of short-circuit currents in the influencing inter-substation zone, as well as estimation of the induced voltage on the wires of the 10 kV disconnected high-voltage overhead line for various schemes of grounding, have been performed. The investigations were carried out on models built using the ATP-EMTP program.
50
Kazymov, Ivan M., and Boris S. Kompaneets. "A Model of Voltage Distribution and Change of Current in the Network Containing Unaccounted Electricity Consumption." Vestnik MEI, no. 6 (2021): 91–99. http://dx.doi.org/10.24160/1993-6982-2021-6-91-99.
Full textAbstract:
The aim of the study is control of commercial losses in electrical grids, especially in low voltage grids, which is one of the priority lines of activities conducted by electric network companies. The complexity of solving this problem is stemming from the difficulty of exactly locating the commercial loss occurrence place under the conditions of extensively branched low and medium voltage electrical networks. Various methods are currently used to determine the commercial loss occurrence places. However, no effective methods have been created for determining the fact and place of unaccounted electricity consumption in networks under the conditions of performing remote analysis of networks based on the data from modern electricity meters used in the automated fiscal electricity metering system. These difficulties can be overcome by developing a model of voltage distribution and change of current in distribution networks of the 0.4--35 kV nominal voltage levels. A model of voltage distribution and changes of current for a network containing unaccounted electricity consumption is proposed. The effectiveness of using the proposed model has been theoretically substantiated; its applicability limits are defined, and the accuracy of the obtained results is estimated. Graphical representation of the proposed model, which is one of the electrical network digital imaging forms, can be used to analyze electrical networks for revealing if there is unaccounted electricity consumption in them. By using the proposed model of voltage distribution and change of current in the network, it is possible to represent the electrical network as a set of electrical parameters to analyze electrical networks for the presence of commercial losses.