scholarly journals Ways to Reduce Power Losses in Mining Power Supply Lines

2019 ◽  
Vol 4 (2) ◽  
pp. 150-156
Author(s):  
N. S. Antsiferov
Keyword(s):  
Electric Power ◽  
Power Supply ◽  
Power Plants ◽  
Power Supply System ◽  
Electric Energy ◽  
Supply System ◽  
Voltage Unbalance ◽  
Unbalanced Voltage ◽  
Unbalanced Load

Electric energy is the most common and universal form of energy. It can be produced in large quantities near energy sources, transmitted to large distances, easily distributed between consumers and converted into mechanical, thermal, and light energy. Ensuring reliable and economical quality electric energy supply to mining enterprises with the optimal use of energy resources is one of the most important tasks facing the country's energy sector. In the Russian Federation, high degree of concentration of generating capacities at power plants has been achieved. The main capacities are concentrated in power plants with installed capacity of more than 1 million kW. High importance of the electric power industry is determined by the infrastructural nature of the industry and the direct relationship between the country's economic growth and the level of its development effectiveness. One of the most pressing problems of modern electricity supply is the problem of ensuring the quality of electric energy. The main reason for the deterioration in the electricity quality is widespread non-linear loads that create non-sinusoidal currents and voltage unbalance during their operation. The voltage unbalance is most often caused by the presence of an unbalanced load. Unbalanced load currents flowing through the elements of the power supply system cause unbalanced voltage losses in them. This results in appearance of unbalanced voltages on the terminals of electric apparatus. The voltage deviations at electric apparatus overdriven phase may exceed the normally acceptable values, while the voltage deviations at electric apparatus other phases may remain within the normal limits. In addition to the deterioration of the voltage mode at electric apparatus under the unbalanced voltage conditions, the operating conditions of both the electric apparatus and all the network elements are significantly worsened, and the reliability of the electrical equipment and the power supply system as a whole decreased. The paper considers the issues of reducing the voltage losses in power supply networks by improving quality of electric power.

Math model of a power beam feeding a spacecraft under conditions of intermittent power supply

2020 ◽  
pp. 56-65
Author(s):  
Aleksey M. BEZNYAKOV ◽  
Aleksey V. NEMIROV ◽  
Gennadiy B. STEGANOV
Keyword(s):  
Power Consumption ◽  
Power Supply ◽  
Power Plants ◽  
Power Supply System ◽  
Supply System ◽  
Solar Array ◽  
Math Model ◽  
Operational Conditions ◽  
Supply Systems

The paper discusses transmission, reception, conversion and consumption of energy of laser and microwave radiation from Earth or space power plants. It proposes a classification of advanced systems for remote supply of power to spacecraft (SC). It addresses practicability of using remote power supply to SC under various operational conditions. The paper formulates the problem of evaluating the capability of the existing SC power supply systems to receive and convert emissions from additional sources. An analysis of criteria for the quality of pulsed or rapidly varying flow of energy into a SC power supply system. It reviews the structures of typical channels of power consumption in a SC power supply system. An equivalent circuit replacing receivers of pulsed or rapidly changing radiation is described. A math model is proposed for a power consumption channel operating under conditions of intermittent power supply to photovoltaic converters. Math modeling results are presented and analyzed. Key words: space power plant, solar array, onboard power supply system, power consumption channel, voltage converters.

Justification of the power supply system for life support of rescue units and the injured population during field deployment

2021 ◽  
Vol 92 ◽  
pp. 142-155
Author(s):  
V. A. Sednev ◽  
Keyword(s):  
Electric Power ◽  
Power Supply ◽  
Power Supply System ◽  
Life Support ◽  
Electric Energy ◽  
Supply System ◽  
Energy Sources ◽  
Electric Power Supply ◽  
Injured Population ◽  
Temporary Accommodation

Introduction. Increasing of number, scale and duration of the consequences of emergency situations associated with the violation of the conditions of normal living of people requires the creation of temporary field accommodation points for the affected population and rescue units. At the same time, electric power supply in field temporary accommodation facilities plays a crucial role in the complex of tasks and measures aimed at providing life to the injured population and rescue units. At the same time, there are no mobile autonomous sources of electric energy for providing life support to people in the field in the organizational and staff structure of rescue units, and the existing sources of electric energy in the complexes of equipment used in areas of emergency situations cannot be used for these purposes. Therefore, it is necessary to develop a scientific and methodological approach to determine necessary and sufficient number of sources of electric energy for the power supply of the life support of the injured population and rescue units when they are placed in field temporary accommodation points. The purpose of the study. Electric power supply of field temporary accommodation points for the injured population and rescue units, ensuring the required reliability of electric power supply, maximizing its efficiency in the conditions of possible resource constraints and minimizing the influence of the uncertainty factor in the planning of electricity consumption. Research methods. The main provisions of the calculation of electrical loads, system theory, set theory, probability theory and the apparatus of mathematical statistics. The results of the study. A methodology has been developed that allows to justify the power of electric energy sources for the power supply of field temporary accommodation points for the injured population and rescue units, rational options for the power supply system, the nomenclature and number of electric energy sources for the life support of people in the field; to calculate the electric network; to evaluate the operation of the power supply system, based on the probability of failure-free operation of the source of electric energy; to justify the composition of engineering means to ensure the creation of the power supply system. Conclusion. The scientific and methodological approach for determining the composition of electric energy sources for the power supply of life support for the injured population and rescue units when they are placed in field temporary accommodation points is justified, which also allows to resolve the contradiction between the need to organize the power supply of life support for people in temporary accommodation points and the lack of a reasonable structure of electric energy sources for these purposes. Keywords: temporary accommodation point, injured population, rescue formation, consumers, electric power supply, organization

Recommendations on the composition of means for power supply and life support of the affected population and rescue units during field deployment

2021 ◽  
Vol 93 ◽  
pp. 208-225
Author(s):  
V. A. Sednev ◽  
Keyword(s):  
Electric Power ◽  
Power Supply ◽  
Power Supply System ◽  
Life Support ◽  
Electric Energy ◽  
Supply System ◽  
Energy Sources ◽  
Electric Power Supply ◽  
Electrical Loads ◽  
Temporary Accommodation

Introduction. The increasing number and duration of the consequences of emergency situations associated with the violation of the conditions of normal living of people requires the creation of autonomous temporary field camps to accommodate the affected population, which, as a rule, create and maintain rescue formations. In the complex of tasks aimed at providing life support to the affected population and rescue units in field camps, their electric power supply plays an important role. However, there are no autonomous sources of electric energy for the power supply of life support for people in the field in the organizational and staff structure of rescue units. At the same time, it is necessary to determine the number of electric energy sources for the power supply of life support for people in field camps, not only taking into account the application of the provisions for calculating the electrical loads of consumers, but also taking into account additional factors, in particular, taking into account the output of electric energy sources for operational reasons, the failure of service personnel, the organization of technical support of the power supply system, its planning, repair. The purpose of the study. Electric power supply of field points of temporary accommodation of the affected population and rescue units, ensuring the reliability of their electric power supply, minimizing the influence of the uncertainty factor when planning their power consumption. Research methods. The main provisions of the calculation of electrical loads, system theory, set theory, probability theory and the apparatus of mathematical statistics. The results of the study. Recommendations have been developed on the composition of electric energy sources for the power supply of life support to the affected population and rescue units when placed in field camps, taking into account additional factors affecting their composition, in particular, the output of electric energy sources for operational reasons, the failure of maintenance personnel, the organization of technical support of the power supply system and other issues. Conclusion. The scientific and methodological approach is justified, which allows taking into account additional factors affecting the formation of the composition of electric energy sources for the power supply of life support of people in temporary accommodation points, which, in combination with scientific and methodological approaches to substantiate the electrical loads of consumers, allows us to develop a comprehensive scientific and methodological approach to substantiate the composition of electric energy sources for the power supply of life support of people. The resulting composition of electric energy sources can be refined and serves as an example of assessing the stability of the power supply system, the criterion of stability of which is its ability to provide consumers with electric energy. Keywords: temporary accommodation point, affected population, rescue formation, consumers, electric power supply, organization

scholarly journals Study of the state of the issue of increasing the quality of electric energy in the power supply systems

2020 ◽  
Vol 216 ◽  
pp. 01163
Author(s):  
Raxmatillo Karimov
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Electric Energy ◽  
Supply System ◽  
Power Transformers ◽  
Load Current ◽  
Current Limiting ◽  
The Moment ◽  
Supply Systems

This article examines the importance of ensuring the quality of electricity and considers the possibility of using a system for monitoring the quality of electricity in the power supply system. Based on the results of the study, it was found that the use of contactless switching devices as switches of sections of windings of power transformers allows you to abandon current-limiting reactors and resistors. This is achieved by the fact that the switching of the windings occurs at the moment the load current passes through zero.

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