Development of a Stand for Demonstration of Human Injury by Touch and Step Voltages Near a 10 kV Overhead Line

Vestnik MEI ◽  
2020 ◽  
Vol 6 (6) ◽  
pp. 39-45
Author(s):  
Ruslan K. Borisov ◽  
◽  
Sergey S. Zhulikov ◽  
Sergey I. Khrenov ◽  
Yuliya S. Turchaninova ◽  
...  
Keyword(s):  
Electric Shock ◽  
Research University ◽  
Moscow Region ◽  
Experimental Investigations ◽  
Clear Understanding ◽  
Overhead Line ◽  
Electric Networks ◽  
Calculation Results ◽  
High Voltage Engineering ◽  
Human Injury

An objective to develop a labor protection engineering stand was set forth as part of the research and development work "Carrying out theoretical and experimental investigations and development of stands for demonstrating the danger of electric shock at a training ground" for visually demonstrating the danger of injuring a person by touch and step voltages in 3…35 kV medium voltage electric networks. The technical solutions for practically implementing the stand were adopted based on an analysis of regulatory documents, conditions under which dangerous touch and step voltages occur, the most typical human injury cases, and calculation results. Specialists of the National Research University Moscow Power Engineering Institute Department of High Voltage Engineering and Electrophysics, working jointly with specialists of PJSC Rosseti Moscow Region have developed, manufactured, tested, and put into operation a stand for demonstrating human injury by the touch and step voltages when a 10 kV wire falls on the ground, on a car, and when a fault of a live wire on the overhead line support occurs. With the stand having been put in use at the PJSC Rosseti Moscow Region Training Center Ground, this will allow the staff to form a clear understanding of the electric shock danger, to focus on the effects caused by voltage and current, and thereby significantly reduce electrical injuries.

Mathematical models and experimental data for HDF based sandwich panels with dual corrugated lightweight core

Holzforschung ◽  
2017 ◽  
Vol 71 (3) ◽  
pp. 265-273 ◽  
Author(s):  
Jerzy Smardzewski ◽  
Dorota Jasińska
Keyword(s):  
Homogeneous Model ◽  
Sandwich Panels ◽  
Experimental Tests ◽  
Strength Properties ◽  
Modulus Of Rupture ◽  
Experimental Investigations ◽  
Calculation Results ◽  
Orthotropic Properties ◽  
Auxetic Structure ◽  
Lightweight Core

Abstract Light layer honeycomb panels could replace traditional wood materials, if their stiffness and strength properties could be improved. The aim of this research was to design and determine elastic properties of sandwich panels (SPs) based on a dual corrugated HDF core. Stiffness matrix values of elements were determined by a numerical method. The 3D calculation results were compared with those of the homogeneous model. The calculation results were collated with those of experimental investigations. It was demonstrated that the linear elasticity modulus as well as the modulus of rupture of the SPs were comparable with mechanical properties of a particle board with identical thickness, while the SP has a 1/3 lower density. The panel core exhibited significant orthotropic properties. In the xy plane it could be characterized as an auxetic structure. The homogeneous model leads to results similar to those achieved from the 3D model and observed in experimental tests.

scholarly journals Experimental and numerical investigation of thermal flow meter

2015 ◽  
Vol 36 (3) ◽  
pp. 149-160 ◽  
Author(s):  
Artur Cebula
Keyword(s):  
Temperature Distribution ◽  
Numerical Model ◽  
Surface Temperature ◽  
Numerical Investigation ◽  
Flow Rate ◽  
Experimental Investigations ◽  
Thermal Flow ◽  
Wall Surface ◽  
Flow Meter ◽  
Calculation Results

Abstract The paper presents analytical and numerical model calculation results of the temperature distribution along the thermal flow meter. Results show a very good conformity between numerical and analytical model. Apart from the calculation results the experimental investigations are presented. The author performed the test where a temperature of duct wall surface was measured. The relation between mass flow rate in terms of the duct surface temperature difference was developed.

scholarly journals Experimental Investigations on the Properties of Epoxy-Resin-Bonded Cement Concrete Containing Sea Sand for Use in Unreinforced Concrete Applications

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 645 ◽  
Author(s):  
Sakthieswaran Natarajan ◽  
Nagendran Neelakanda Pillai ◽  
Sophia Murugan
Keyword(s):  
Epoxy Resin ◽  
Experimental Studies ◽  
Sem Analysis ◽  
Polymer Concrete ◽  
Experimental Investigations ◽  
Clear Understanding ◽  
Fine Aggregate ◽  
Practical Applications ◽  
Durability Properties ◽  
Sea Sand

This paper deals with the experimental studies conducted on the effects of using sea sand on the properties of polymer concrete modified using epoxy resin. The physical properties including workability, mechanical properties, and durability properties were evaluated as a function of sea-sand substitution. The results obtained behave as strong evidence for the feasibility of using sea sand as fine aggregate to solve the problem associated with the exhaustion of natural aggregates when used in combination with epoxy polymer. A clear understanding of the behavior of polymer concrete with sea sand as aggregate was obtained through some preliminary investigations. The test results showed a significant improvement in the compressive and flexural strength due to the sea-sand substitution in polymer concrete. Resistance to the water intrusion was also improved for the concrete mixes due to the inclusion of epoxy resin. The quality and the integrity of the concrete were also improved,as evident from the SEM analysis and infrared (IR) spectroscopy, and the results function as solid basis for the use of sea-sand polymer-modified concrete for practical applications. Results also show that 15% replacement of fine aggregate by sea sand in air-cured polymer concrete exhibited enhanced strength and durability properties; thus, the produced concrete can be an effective material for unreinforced concrete applications.

The NRU MPEI Department of High Voltage Engineering and Electrophysics Turns 90

2021 ◽  
pp. 54-62
Author(s):  
Marina V. SOKOLOVA ◽  
◽  
Alexander G. TEMNIKOV ◽  
Serguey I. KHRENOV ◽  
◽  
...  
Keyword(s):  
Electric Fields ◽  
High Voltage ◽  
Transmission Lines ◽  
Research University ◽  
Power Transmission ◽  
Research Work ◽  
Scientific Work ◽  
Educational Process ◽  
Educational Activity ◽  
High Voltage Engineering

In 2021, the Department of High Voltage Engineering and Electrophysics, one of the oldest departments of the National Research University Moscow Power Engineering Institute, celebrates its 90-year anniversary. The article outlines the main stages of the department's life, areas of educational activity and research work related to improving the reliability and performance efficiency of high-voltage equipment at electrical substations and in power transmission lines. The main scientific results obtained in different years by the department specialists are presented, and their reflection in the educational process is shown. Special attention is paid to the establishment of the Problem Laboratory of Strong Electric Fields. The material presented in the article shows the great contribution made for the department by its heads: professors L.I. Sirotinsky, D.V. Razevig, V.P. Larionov, and I.P. Vereshchagin, who were the creators of the department and laid the spirit of creative approach to the problems solved both in the training of specialists and in scientific work, which distinguished the department throughout all 90 years of its existence.

Changing the Arc Efficiency during Melting of a Charge in Arc Steel Melting Furnaces

2016 ◽  
Vol 870 ◽  
pp. 441-445
Author(s):  
A.N. Makarov ◽  
M.K. Galicheva ◽  
A.V. Kuznetsov
Keyword(s):  
Energy Consumption ◽  
Electric Energy ◽  
Experimental Investigations ◽  
Steel Melting ◽  
Electric Energy Consumption ◽  
Calculation Results ◽  
Metallized Pellets ◽  
A Charge ◽  
Energy Balances

The article presents the results stemming from the calculation of the arc efficiency of arc steel melting furnaces during melting of scrap and metallized pellets. Furnaces that use metallized pellets are characterized by less arc efficiency and a higher electric energy consumption than similar pellet furnaces. The calculation results are confirmed by experimental investigations of energy balances of arc steel melting furnaces during melting of scrap and metallized pellets.

Numerical Analysis of the Influence of Bolt Pretension on Rigid Flange Joint Rigidity in Substation Steel Structures

2013 ◽  
Vol 405-408 ◽  
pp. 3186-3191 ◽  
Author(s):  
Yan Wang ◽  
Zu Tian Cheng ◽  
Yi Liang Peng ◽  
Xin Gu ◽  
Tao Zhang
Keyword(s):  
Finite Element ◽  
Steel Structures ◽  
Element Model ◽  
Experimental Investigations ◽  
Shear Rigidity ◽  
Flange Joint ◽  
Bending Rigidity ◽  
Calculation Results ◽  
Bolt Pretension ◽  
Joint Rigidity

in order to research the influence of bolt pretension on the rigid flange joints stiffness further, ANSYS finite element model was built on the basis of experimental investigations, and was used to research the influence of bolt pretension on the axial rigidity, shear rigidity and bending rigidity. The calculation results indicated that the axial rigidity, shear rigidity and bending rigidity were all increased along with the increase of bolt pretension, and the increase of axial rigidity was most obvious.

scholarly journals Learning From Collaborative Teacher Development in an EAP/ESP Context

2016 ◽  
Vol 2 (1) ◽  
pp. 72-78
Author(s):  
Elena Velikaya
Keyword(s):  
Teacher Development ◽  
Research University ◽  
English Language ◽  
Language Teachers ◽  
Clear Understanding ◽  
Peer Observation ◽  
Collaborative Process ◽  
Wide Range ◽  
English Language Teachers ◽  
Almost All

‘Collaborative teacher development is an increasingly common kind of teacher development found in a wide range of language teaching contexts’. Teachers can collaborate with other teachers in writing materials, books, doing research, and analysing observed lessons. Even the format and the content of a teaching journal can be developed in cooperation with other colleagues. The article reports on collaborative teacher development of English language teachers at the National Research University Higher School of Economics (NRU HSE) in Moscow, Russia. The study used a survey to investigate needs for teacher development at NRU HSE. Findings reveal that not all teachers practise self-observation; many teachers believe that feedback must be personal; the majority of teachers find peer observation subjective; almost all teachers have teaching journals but their understanding of what a teaching journal is seems to be erroneous. These results indicate that without a clear understanding of the listed above issues and their implementation in a given context professional development can hardly be possible. The author analyses the results of this research and makes suggestions about teacher development as a continuous and collaborative process.

scholarly journals Comparison heat and mass transfer coefficients in the shell side of the hollow fiber membrane module

2018 ◽  
Vol 44 ◽  
pp. 00040
Author(s):  
Sebastian Englart
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Hollow Fiber Membrane ◽  
Water System ◽  
Membrane Module ◽  
Experimental Investigations ◽  
Transfer Coefficients ◽  
Shell Side ◽  
Mass Transfer Coefficients ◽  
Calculation Results

The article discusses the theory associated with the determination of total heat and mass transfer coefficients in a membrane module. The equations for determining Nusselt and Sherwood numbers on the shell side of the module are presented. The design of the membrane module and the test bench are also discussed. The convective coefficients of heat and mass transfer on the shell side have been determined on the basis of the measurements. Calculation results obtained from correlation equations were then compared with the results of experimental investigations of convective heat and mass transfer coefficients in the air-water system. The equation is indicated appropriate for use in the case analysed.

scholarly journals Analysis of the Efficiency of Composite Supports in Electric Networks of the Republic of Belarus

2019 ◽  
Vol 62 (1) ◽  
pp. 15-23
Author(s):  
M. I. Fursanov ◽  
P. A. Sazonov
Keyword(s):  
Electric Power Industry ◽  
Structure Design ◽  
Power Lines ◽  
Overhead Line ◽  
Electric Networks ◽  
Western Countries ◽  
Advantages And Disadvantages ◽  
The Republic ◽  
The One ◽  
Overhead Power Lines

Modern conditions for the development of the electric power industry increase the requirements in the field of technical conditions and reliability; thus, in a number of Western countries electric networks are being restructured on the basis of safe, environmentally friendly and reliable composite supports. The article analyzes the structure, design and methods of construction of overhead power lines with composite supports that are more promising than traditional ones. The properties, main characteristics and advantages of materials for the production supports of fiberglass and of wood are considered. The advantages and disadvantages of composite and wooden racks are compared and it is shown that most of the requirements for the supports of overhead power lines are met by composite supports. It is discovered that the existing and promising solutions that enable effective use of composite supports in the construction of an overhead line are quite diverse. Currently, in the electrical networks of Western countries, the most common structural model of the construction of an overhead line is the one the one that alternates composite and wooden supports in a certain sequence. The best option of the use of composite supports along with wood ones is the following ratio: four composite supports to one wooden one (method of construction “4/1”). The advantages of this method of construction of the power line are presented, viz. a significant increase in the mechanical strength of the structure of supports and wires as well as the safety of their maintenance. The results of technical and economic calculation that confirm the advantage of constructing a 10 kV distribution line according to the “4/1” scheme are presented. The implementation of composite supports in the electric networks of the Republic of Belarus in the long term will allow obtaining a tangible financial effect by reducing the cost of operation of the overhead line and because of a significant period of operation of composite racks, which is an undoubted advantage in conditions of the modern market economy. 

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