scholarly journals Modeling the reliability of electrical power lines of the seaport in conditions forced electricity consumption

2021 ◽  
pp. 121-127
Author(s):  
А.П. Лицкевич ◽  
С.А. Лицкевич ◽  
О.Н. Лицкевич
Keyword(s):  
Mathematical Model ◽  
Technological Process ◽  
Operating Time ◽  
Electricity Consumption ◽  
Arbitrary Point ◽  
Power Line ◽  
Operating Conditions ◽  
Power Lines ◽  
Power Cable ◽  
Cable Line

В работе рассматривается задача оценки времени наработки силовой кабельной линии морского порта, с учетом форсирования технологического процесса в морском порту (погрузочно-разгрузочных работ) и, в связи с этим, повышения величины токовой нагрузки в силовой линии, превышающей допустимый предел, что ведет к повреждению линии. Для оценки влияния форсированного технологического процесса, на наработку силовых линий, вводятся основные факторы влияния: время длительности форсированного режима; величина тока в линии; температура окружающей среды. С их помощью вводится функция сокращающегося временного ресурса наработки силовой линии, которая отображает повреждения в силовой линии. Общая математическая модель наработки силовой кабельной линии включает повреждения в кабельной линии как основной фактор. Решение задач осуществляется с помощь разработанных программных средств и применения нечеткой математики, в среде Mathcad. Представленная математическая модель позволяет количественно оценить время наработки при использовании форсированных технологических режимов и повышенного потребления энергии, а также оценить степень снижения времени наработки, в результате суммарного действия повреждающих факторов, для произвольного момента времени в условиях эксплуатации. The paper considers the problem of estimating the operating time of the power, cable line of the seaport, taking into account the acceleration of the technological process in the seaport (loading and unloading operations) and, in this regard, the increase in the current load in the power line exceeding the permissible limit, which leads to damage lines. To assess the influence of the forced technological process on the operating time of the power lines, the main factors of influence are introduced: the duration of the forced mode; line current value; ambient temperature. With their help, the function of reducing the time resource of the operating time of the power line is introduced, which displays the damage in the power line). The general mathematical model of the power cable line operating time includes damage in the cable line as the main factor. The solution of problems is carried out with the help of the developed software and the use of fuzzy mathematics, in the Mathcad environment. The presented mathematical model makes it possible to quantitatively evaluate the operating time when using forced technological modes and increased energy consumption, as well as to assess the degree of reduction in the operating time, as a result of the total action of damaging factors, for an arbitrary point in time under operating conditions.

scholarly journals Logical-probabilistic assessment of the occurrence of destruction during intersystem interactions in the electrical system of the seaport

2021 ◽  
Vol 2061 (1) ◽  
pp. 012131
Author(s):  
O N Litskevich ◽  
A P Litskevich
Keyword(s):  
Technological Process ◽  
Power Supply ◽  
Physical Nature ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Power Line ◽  
Electrical System ◽  
Cable Line ◽  
Composite Object ◽  
Electrical Wear

Abstract This article solves the problem of a quantitative assessment of the occurrence of destruction in the intersystem interactions of the transport system and the electrical system of the seaport, in the conditions of the technological process in the seaport, which indicates its significant impact on the electrical system, as a result of which the reliability of the berthing power line is significantly reduced. The intersystem interactions that occur during the implementation of the technological process, as experience shows, are the causes of critical situations that occur at the border of areas of different physical nature, and the consequences are recorded, in the case under consideration, in the electrical system. A mathematical model describing intersystem destruction in quantitative form is presented in this paper using a logical-probabilistic model that reflects internal and external relationships. In the object under study, the destructive cause (collision) and the consequence (accumulation of electrical damage in the insulation of the cable line) are in the same object (the mooring power supply unit), and this is limited to the effects of intersystem destruction. In such a statement, the object of power supply of the technological process and equipment is considered as a composite object containing a cable line and an electric contact column. The problem being formulated is an important and relevant scientific task, which includes not only the question of identifying the causes of increased electrical wear of the power line, but also the development of methods for obtaining quantitative results, and in practical terms also involves the diagnosis of the technical condition of electrical equipment and timely preventive maintenance.

scholarly journals ECOLOGICAL ASSESSMENT OF THE POWER LINE WOOD POLES PRODUCTION PROCESS

2001 ◽  
Vol 1 ◽  
pp. 94
Author(s):  
Ziedonis Miklaševičs
Keyword(s):  
Process Control ◽  
Production Process ◽  
Technological Process ◽  
Ecological Assessment ◽  
Power Line ◽  
Technological Scheme ◽  
Power Lines ◽  
Environmental Aspects ◽  
Hazard Estimate

For maintenance of the technological process, control and ecological assesment it is necessary to perform an estimate of environmental aspects that could have a sensible impact to environment. Environmental aspects and its impact is analyzed in the report. In the report is developed: 1. Friendly to environment technological scheme for production of wood poles for power lines. 2. Principial scheme and models o f hazard estimate 3. Hazard charts for the environmental defence 4. Algorithm of estimate of ecological for the environment That depends o f the problem’s topicality and enumeration of the hazard factors the specific problems solutions are offered that allow to controlthe manyfacturing process from the view of allowance need related to environmental defence.

Crane movement limiting device design for safe operation near power lines

1998 ◽  
Vol 1 (2) ◽  
pp. 95-105
Author(s):  
Daniel Imbeau ◽  
Joseph-Jean Paques ◽  
Sylvie Bergeron ◽  
Réal Bourbonnière
Keyword(s):  
Power Line ◽  
Operating Conditions ◽  
Power Lines ◽  
Control Input ◽  
Safe Operation ◽  
Motion Response ◽  
Braking System ◽  
Fixed Length ◽  
Lifting Capacity ◽  
Hard Ball

Performance of experienced crane operators in stopping rotational movements of a crane platform was compared with that of an automatic braking system. Sixteen certified crane operators performed boom movements towards a segment of a typical power line using a 100 tons lifting capacity crane equipped with a fixed-length 18 m long boom, a single lifting cable, and hard ball hook. The 18 m boom was later replaced with a 49 m boom to vary crane geometry and motion response. In all trials, a 1500 kg (3500 lb) load was hooked to the lifting cable. In critical operating conditions, the control input strategy used by the experienced crane operators could yield a stopping angle comparable to that of the automatic braking system. However, when compared with the automatic braking system, the operators had a better control on the oscillations of the load during the stopping maneuver. The data collected in this experiment were used to specify two key parameters in the design of a crane movement limiting device.

Application of vacuum belt press filters for cane mud filtration and performance comparison with rotary filters

2014 ◽  
pp. 298-301 ◽  
Author(s):  
Arnaud Petit
Keyword(s):  
Electricity Consumption ◽  
Performance Comparison ◽  
Operating Conditions ◽  
Vacuum Filter ◽  
Sugar Mill ◽  
Belt Press ◽  
Vacuum Belt ◽  
And Performance ◽  
Mud Filtration ◽  
The Impact

Bois-Rouge factory, an 8000 t/d cane Reunionese sugarcane mill, has fully equipped its filtration station with vacuum belt press filters since 2010, the first one being installed in 2009. The present study deals with this 3-year experience and discusses operating conditions, electricity consumption, performance and optimisation. The comparison with the more classical rotary drum vacuum filter station of Le Gol sugar mill highlights advantages of vacuum belt press filters: high filtration efficiency, low filter cake mass and sucrose content, low total solids content in filtrate and low power consumption. However, this technology needs a mud conditioning step and requires a large amount of water to improve mud quality, mixing of flocculant and washing of filter belts. The impact on the energy balance of the sugar mill is significant. At Bois-Rouge mill, studies are underway to reduce the water consumption by recycling low d.s. filtrate and by dry cleaning the filter belts.

Validation of mathematical model of electrothermal calculation of DC catenary on the basis of scale model

2018 ◽  
Vol 77 (4) ◽  
pp. 222-229 ◽  
Author(s):  
A. V. Paranin ◽  
A. B. Batrashov
Keyword(s):  
Mathematical Model ◽  
Operating Conditions ◽  
Scale Model ◽  
Contact Network ◽  
Scaled Model ◽  
Cross Sectional ◽  
Current Collection ◽  
Topological Features ◽  
Study Results ◽  
Real Physical Process

The article compares the results of calculation of the finite element simulation of current and temperature distribution in the scale model of the DC catenary with the data of laboratory tests. Researches were carried on various versions of the structural design of catenary model, reflecting the topological features of the wire connection, characteristic of the DC contact network. The proportions of the cross-sectional area of the scaled model wires are comparable to each other with the corresponding values for real DC catenary. The article deals with the operating conditions of the catenary model in the modes of transit and current collection. When studying the operation of the scale catenary model in the transit mode, the effect of the structural elements on the current distribution and heating of the wires was obtained. Within the framework of the scale model, theoretical assumptions about the current overload of the supporting cable near the middle anchoring have been confirmed. In the current collection mode, the experimental dependences of the current in the transverse wires of the scale model are obtained from the coordinate of the current collection point. Using the model it was experimentally confirmed that in the section of the contact wire with local wear, not only the temperature rise occurs but also the current redistribution due to the smaller cross section. Thus, the current share in other longitudinal wires of the scale model increases and their temperature rises. Scale and mathematical models are constructed with allowance for laboratory clamps and supporting elements that participate in the removal of heat from the investigated wires. Obtained study results of the scale model allow to draw a conclusion about the adequacy of the mathematical model and its correspondence to the real physical process. These conclusions indicate the possibility of applying mathematical model for calculating real catenary, taking into account the uneven contact wear wire and the armature of the contact network.

Viability of turbine blade material with a long service life

2019 ◽  
pp. 28-35
Author(s):  
O. B. Berdnik ◽  
I. N. Tsareva ◽  
M. K. Chegurov
Keyword(s):  
Heat Treatment ◽  
Service Life ◽  
Yield Strength ◽  
Mechanical Characteristics ◽  
Operating Time ◽  
Structural Features ◽  
Operating Conditions ◽  
Standard Methods ◽  
Experimental Values ◽  
Plasticity Coefficient

This article deals with structural features and characteristic changes that affect the mechanical characteristics after different service life in real conditions using the example of the blades of the 4th stage of turbine GTE-45-3 with an operating time of 13,000 to 100,000 hours. To study the change in the state of the material under different operating conditions, determine the degree of influence of heat treatment on the regeneration of the microstructure, and restore the mechanical characteristics of the alloy after different periods of operation, non-standard methods were used: relaxation tests on miniature samples to determine the physical yield strength and microplasticity limit and quantitative evaluation of the plasticity coefficient of the material from experimental values of hardness, which allow us to identify the changes occurring in the microvolumes of the material and predict the performance of the product as a whole.

scholarly journals Comprehensive Parameters Identification and Dynamic Model Validation of Interior-Mount Line-Start Permanent Magnet Synchronous Motors

Machines ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 4 ◽  
Author(s):  
Luqman S. Maraaba ◽  
Zakariya M. Al-Hamouz ◽  
Abdulaziz S. Milhem ◽  
Ssennoga Twaha
Keyword(s):  
Mathematical Model ◽  
Permanent Magnet ◽  
High Efficiency ◽  
Experimental Tests ◽  
Induction Machines ◽  
Test Methods ◽  
Operating Conditions ◽  
Test Method ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors

The application of line-start permanent magnet synchronous motors (LSPMSMs) is rapidly spreading due to their advantages of high efficiency, high operational power factor, being self-starting, rendering them as highly needed in many applications in recent years. Although there have been standard methods for the identification of parameters of synchronous and induction machines, most of them do not apply to LSPMSMs. This paper presents a study and analysis of different parameter identification methods for interior mount LSPMSM. Experimental tests have been performed in the laboratory on a 1-hp interior mount LSPMSM. The measurements have been validated by investigating the performance of the machine under different operating conditions using a developed qd0 mathematical model and an experimental setup. The dynamic and steady-state performance analyses have been performed using the determined parameters. It is found that the experimental results are close to the mathematical model results, confirming the accuracy of the studied test methods. Therefore, the output of this study will help in selecting the proper test method for LSPMSM.

scholarly journals Evaporator Optimization of Refrigerator Systems Using Quality Analysis

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 555
Author(s):  
Sangkyung Na ◽  
Sanghun Song ◽  
Seunghyuk Lee ◽  
Jehwan Lee ◽  
Hyun Kim ◽  
...  
Keyword(s):  
Power Consumption ◽  
Operating Time ◽  
Cooling Capacity ◽  
Operating Conditions ◽  
Quality Analysis ◽  
Lubricating Oil ◽  
Optimal Operating ◽  
Compressor Piston ◽  
Refrigerator Temperature ◽  
Visualization Experiments

In this study, evaporator optimization, via both experimental and simulation methods was conducted. To evaluate the evaporator performance, under the optimal system, the compressor operating time and the effects of oil on the refrigerator system were studied. If the temperature of the refrigerator chamber reaches the setting value, the compressor stops working and it leads to the temperature of the refrigerator chamber slowly increasing, due to the heat transfer to the ambient. When the refrigerator temperature is out of the setting range, the compressor works again, and the refrigerator repeats this process until the end of its life. These on/off period can be controlled through the compressor piston movement. To determine the optimal compressor operating conditions, experiments of monthly power consumption were conducted under various compressor working times and the lowest power consumption conditions was determined when the compressor worked continuously. Lubricating oil, the refrigerator system, using oil, also influenced the system performance. To evaluate the effect of oil, oil eliminated and oil systems were compared based on cooling capacity and power consumption. The cooling capacity of the oil eliminated system was 2.6% higher and the power consumption was 3.6% lower than that of the oil system. After determining the optimal operating conditions of the refrigerator system, visualization experiments and simulations were conducted to decide the optimal evaporator and the conventional evaporator size can be reduced by approximately 2.9%.

scholarly journals Comparison of Screening Configurations for the Mitigation of Voltages and Currents Induced on Pipelines by HVAC Power Lines

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3855
Author(s):  
Arturo Popoli ◽  
Leonardo Sandrolini ◽  
Andrea Cristofolini
Keyword(s):  
Finite Element Analysis ◽  
Cross Sections ◽  
Detrimental Effect ◽  
Power Line ◽  
Skin Depth ◽  
Power Lines ◽  
Element Analysis ◽  
3D Finite Element ◽  
Different Shapes ◽  
High Magnetic Permeability

In this paper, a strategy for reducing the electromagnetic interferences induced by power lines on metallic pipelines is proposed and numerically investigated. The study considers a set of steel conductors interposed between the power line and the pipeline. Different shapes of conductor cross sections and different magnetic permeabilities are considered, to identify the solution exhibiting the greatest mitigation efficiency for the same amount of material. The investigation is carried out by means of a quasi-3D finite element analysis. Results show that the main mechanism responsible for the mitigation is constituted by the currents induced in the screening conductors by the power line. Hence, a high magnetic permeability can have a detrimental effect since it reduces the skin depth to values below the size of the screening conductor. In this case, a reduction of the screening current and in the mitigation efficiency is observed. Nevertheless, the study shows that the use of strip-shaped screening conductors allows the employment of cheaper magnetic materials without compromising the mitigation efficacy of the screening conductors.

scholarly journals Impact of Operating Time on Selected Tribological Properties of the Friction Material in the Brake Pads of Passenger Cars

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 884
Author(s):  
Andrzej Borawski
Keyword(s):  
Tribological Properties ◽  
Operating Time ◽  
Friction Material ◽  
Operating Conditions ◽  
Direct Impact ◽  
Passenger Cars ◽  
Wear Factor ◽  
Brake Pads ◽  
Road Users ◽  
The Coefficient Of Friction

Braking systems have a direct impact on the safety of road users. That is why it is crucial that the performance of brakes be dependable and faultless. Unfortunately, the operating conditions of brakes during their operating time are affected by many variables, which results in changes in their tribological properties. This article presents an attempt to develop a methodology for studying how the operating time affects the value of the coefficient of friction and the abrasive wear factor. The Taguchi method of process optimization was used to plan the experiment, which was based on tests using the ball-cratering method. The results clearly show that the degree of wear affects the properties of the friction material used in the production process of brakes.

Sign in / Sign up

Export Citation Format

Share Document