scholarly journals Problems of Remote Temperature Measurement of Small Objects of Electricity Power Systems—On the Example of Lashing Clamps of Bridge Connections on High Voltage Poles

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5041
Author(s):  
Waldemar Minkina
Keyword(s):  
Power Systems ◽  
Temperature Measurement ◽  
High Voltage ◽  
Thermal Imaging ◽  
Electrical Power ◽  
Point Of View ◽  
Power Lines ◽  
Electricity Power ◽  
Infrared Cameras ◽  
Bridge Connections

The article presents problems occurring during remote temperature measurement of lashing clamps of bridge connections on high voltage poles using thermal imaging cameras. The basic metrological parameters of thermal imaging cameras are described. On this basis, typical errors made during the inspection of high voltage lines supplying power substations are presented using infrared cameras. Researching the possible solutions for the problems of remote temperature measurement of small objects of electricity power systems—on the example of lashing clamps of bridge connections on high voltage poles in the proposed paper and showing the basic metrological aspects and parameters of thermal imaging cameras are important because, in this way, it is observed to eliminate costly interruptions in the supply of electricity associated with the breaking of power lines. Small objects are quite difficult to be controlled and monitored on large grids and on large powerline poles; thus, it is very challenging to interpret the data offered by thermograms. The problem of remote temperature measurement of small objects in electrical power engineering is very important from the point of view of the quality and reliability of electricity supply. Obtaining early warning information about the occurrence of overheating, e.g., on lashing clamps of bridge connections, is very important, as it eliminates costly interruptions in the supply of electricity associated with the breaking of power lines supplying high voltage switchgears or substations.

BASIN CONFIGURATION OF A SIX-DIMENSIONAL MODEL OF AN ELECTRIC POWER SYSTEM

2002 ◽  
Vol 12 (06) ◽  
pp. 1333-1356 ◽  
Author(s):  
YOSHISUKE UEDA ◽  
HIROYUKI AMANO ◽  
RALPH H. ABRAHAM ◽  
H. BRUCE STEWART
Keyword(s):  
Power Systems ◽  
Power System ◽  
Initial Conditions ◽  
Electrical Power ◽  
Practical Importance ◽  
Intervention Strategy ◽  
Basins Of Attraction ◽  
Electric Power System ◽  
Point Of View ◽  
Electrical Power System

As part of an ongoing project on the stability of massively complex electrical power systems, we discuss the global geometric structure of contacts among the basins of attraction of a six-dimensional dynamical system. This system represents a simple model of an electrical power system involving three machines and an infinite bus. Apart from the possible occurrence of attractors representing pathological states, the contacts between the basins have a practical importance, from the point of view of the operation of a real electrical power system. With the aid of a global map of basins, one could hope to design an intervention strategy to boot the power system back into its normal state. Our method involves taking two-dimensional sections of the six-dimensional state space, and then determining the basins directly by numerical simulation from a dense grid of initial conditions. The relations among all the basins are given for a specific numerical example, that is, choosing particular values for the parameters in our model.

Lightning Protection of Substations and the Effects of the Frequency-Dependent Surge Impedance of Transformers

2013 ◽  
pp. 398-437
Author(s):  
Rafal Tarko ◽  
Wieslaw Nowak
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Power Transmission ◽  
Electrical Power ◽  
Computer Calculation ◽  
Electrical Power Systems ◽  
Surge Arresters ◽  
Phase Conductors ◽  
Extra High Voltage ◽  
Economic Nature

The reliability of electrical power transmission and distribution depends upon the progress in the insulation coordination, which results both from the improvement of overvoltage protection methods and new constructions of electrical power devices, and from the development of the surge exposures identification, affecting the insulating system. Owing to the technical, exploitation, and economic nature, the overvoltage risk in high and extra high voltage electrical power systems has been rarely investigated, and therefore the theoretical methods of analysis are intensely developed. This especially applies to lightning overvoltages, which are analyzed using mathematical modeling and computer calculation techniques. The chapter is dedicated to the problems of voltage transients generated by lightning overvoltages in high and extra high voltage electrical power systems. Such models of electrical power lines and substations in the conditions of lightning overvoltages enable the analysis of surge risks, being a result of direct lightning strokes to the tower, ground, and phase conductors. Those models also account for the impulse electric strength of the external insulation. On the basis of mathematical models, the results of numerical simulation of overvoltage risk in selected electrical power systems have been presented. Those examples also cover optimization of the surge arresters location in electrical power substations.

scholarly journals TRATAMIENTO A LOS CONTENIDOS RELACIONADOS CON LAS MÁQUINAS Y LOS ACCIONAMIENTOS ELÉCTRICOS EN LA FORMACIÓN DEL TÉCNICO MEDIO EN ELECTRICIDAD EN CUBA: HISTORIA Y REFERENTES TEÓRICOS

2018 ◽  
Vol 3 (3) ◽  
pp. 73
Author(s):  
Alberto Luis Torres Ferrales
Keyword(s):  
Power Systems ◽  
Electrical Power ◽  
Point Of View ◽  
Electrical Power Systems ◽  
Electric Drives ◽  
Electrical Systems ◽  
School Year ◽  
Palabras Clave

En el artículo se presentan las tendencias históricas del proceso pedagógico profesional de los contenidos relacionados con las Máquinas y los Accionamientos Eléctricos, teniendo en cuenta que la especialidad Electricidad surge del año escolar 1994 - 1995, anteriormente, las especialidades donde se impartieron los contenidos de referencia (sistemas de energía eléctrica, mantenimiento eléctrico y sistemas eléctricos industriales) se agruparon en la rama de Energía. Además, se exponen las referencias del proceso pedagógico profesional de los contenidos referidos, se basa desde el punto de vista psicológico y pedagógico a partir del análisis del criterio de varios autores. Las posiciones se asumen en correspondencia con las tendencias del desarrollo de la Pedagogía en Cuba y se hacen precisiones sobre los objetivos y contenidos. PALABRAS CLAVE: Contenidos; proceso; profesional; tendencias. TREATMENT OF THE CONTENTS RELATED TO MACHINES AND ELECTRIC DRIVES IN THE TRAINING OF THE MEDIUM TECHNICIAN IN ELECTRICITY IN CUBA: HISTORY AND THEORETICAL REFERENTS ABSTRACT In the article the historical tendencies of the professional pedagogical process of the contents related to the Machines and the Electric Drives are presented, taking into account that the specialty Electricity arises from the school year 1994 - 1995, previously, the specialties where the contents were taught of reference (electrical power systems, electrical maintenance and industrial electrical systems) were grouped in the Energy branch. In addition, the references of the professional pedagogical process of the referred contents are exposed, it is based from the psychological and pedagogical point of view from the analysis of the criterion of several authors. Positions are assumed in correspondence with the tendencies of the development of Pedagogy in Cuba and precisions are made about the objectives and contents. KEYWORDS: Contents; process; professional; trends. 

scholarly journals LOCAL MONITORING OF THE ENVIRONMENTAL SITUATION IN RESIDENTIAL AREAS WITH HIGH LEVELS OF ELECTROMAGNETIC RADIATION

2021 ◽  
Vol 447 (3) ◽  
pp. 46-52
Author(s):  
N.S. Faiz ◽  
М.I. Satayev ◽  
А.М. Azimov ◽  
Sh.K. Shapalov ◽  
S.A. Turguldinova
Keyword(s):  
Electromagnetic Radiation ◽  
High Voltage ◽  
Energy Demand ◽  
Information Technologies ◽  
Point Of View ◽  
Power Lines ◽  
Residential Areas ◽  
New Energy ◽  
Functional Features ◽  
High Voltage Power Lines

The growing energy demand of the city of Shymkent has led to the construction and introduction of new energy hubs, high-voltage power lines, which are being built and conducted around residential areas exposed to environmental and carcinogenic risks. In turn, when constructing new energy facilities, energy companies and designers should present a cartography of residential areas in the project, in addition to the features of the selected territories and the population, which becomes a multi-factor object and subject of research when taking into account environmental and sanitary-epidemiological requirements, as well as when choosing optimal solutions in terms of routing high-voltage power lines. In our case, the residential district of Nursat, Nazarbayev Avenue and Kazygurt were chosen as such objects, which are polluted residential areas from the point of view of the spread of electromagnetic radiation generated by high-voltage power lines with a voltage of 110 and 220 kV. The introduction of modern information technologies of a new generation made it possible to pinpoint and determine the main zones of electromagnetic radiation contamination, to establish the gradients of the electric and magnetic fields according to the degree of its impact, as well as to determine the number of residential objects that are partly exposed to carcinogenic and environmental risk by using the functional features of the geoinformation program.

scholarly journals REDUCING THE LIKELIHOOD OF ELECTRICAL POWER-RELATED DISASTERS: A FUZZY MCDM APPROACH

2018 ◽  
Vol 9 (1) ◽  
pp. 679-686
Author(s):  
Eko Setiawan ◽  
Septin Puji Astuti ◽  
Handoko Handoko
Keyword(s):  
Power Systems ◽  
Power System ◽  
Selection Process ◽  
Human Life ◽  
Electrical Power ◽  
Electrical Power System ◽  
Electrical Power Systems ◽  
Analytic Hierarchy ◽  
Electricity Power ◽  
Negative Impacts

Many of disasters are related to electrical power systems. They affect human life and economy. In order to reduce the negative impacts caused by the failure of electricity power system due to disasters and to create a robust electrical power system, selecting the best relay of electricity power is a must. This study identified the best protective relay of electrical power systems of PLN in Surakarta region by applying analytic hierarchy process (AHP), one of MCDM approaches, combined with fuzzy logic. Extent analysis approach was implemented to derive priorities of various criteria, sub-criteria and alternatives. Three relays being considered in the selection process are electromagnetic relay, digital relay and static relay. Four criteria in this study are techno-economy, fault frequency, protection of transmission line and advantage of relay over others. Meanwhile, five sub-criteria for each criterion are reliability, selectivity, sensitivity, working speed and efficient. Based on the criteria and sub-criteria, it can be inferred that in terms of four working areas of PLN management in Surakarta region, digital relay is seen as the best choice of relays.

scholarly journals MODELLING OF COMPACT POWER LINES WITH THE TRIANGULAR ARRANGEMENT OF WIRES

2018 ◽  
Vol 1 (12) ◽  
pp. 20-28
Author(s):  
Natal'ya Buyakova ◽  
Andrey Kryukov ◽  
Van Le
Keyword(s):  
Power Systems ◽  
Electrical Power ◽  
Power Line ◽  
Power Lines ◽  
Equivalent Circuits ◽  
Electrical Power Systems ◽  
Electricity Transmission ◽  
Phase Coordinates ◽  
Standard Design ◽  
Definition Of

Development of methods and simulars of compact lines of an electricity transmission of the increased capacity. Methods of definition of the modes of electrical power systems (EPS) on the basis of phase coordinates which basis models of elements in the form of trellised equivalent circuits with full-coherent topology are were applied. These models and methods are realized in the program Fazonord-APC complex providing modeling of the EPS stationary modes and also definition of tensions of the electromagnetic field which is created by power lines of various design. Results of modeling of the modes and electromagnetic fields on routes of the compact power line (CPL) of an electricity transmission of 220 kV with a triangular arrangement of wires are presented. For comparison similar calculations for a standard power line (SPL) of 220 kV of a standard design are executed.

Efficiency of High Voltage Transmission in Power Lines

2019 ◽  
Vol 01 (04) ◽  
pp. 1920009
Author(s):  
Ker Liang Goh
Keyword(s):  
High Voltage ◽  
Electrical Power ◽  
Introductory Physics ◽  
Power Lines ◽  
Power Station ◽  
Physics Courses ◽  
Alternative Method ◽  
High Voltage Transmission ◽  
Introductory Physics Courses

In introductory Physics courses, one might come across a question of why electricity is transmitted from the power station at high voltage? Analysis of a typical quantitative question is illustrated in this paper, showing its deficiencies. An alternative method that mimics more closely to realistic situations is proposed to better illustrate the increase in efficiency of transmitting electrical power at high voltages.

scholarly journals A REVIEW OF STUDY AND ANALYSIS OF PARTIAL DISCHARGE FOR DIFFERENT INSULATION MATERIALS WITH CAPACITANCE VALUE

2021 ◽  
Vol 7 (12) ◽  
pp. 64-66
Author(s):  
Neetu Baghelkar ◽  
Abhishek Dubey
Keyword(s):  
Power Systems ◽  
Power System ◽  
High Voltage ◽  
Electrical Power ◽  
Electrical Equipment ◽  
Electrical Power System ◽  
Insulation Materials ◽  
System A ◽  
Solid Liquid

In the high voltage (HV) electrical power system, a variety of solid, liquid and gaseous materials are used for insulation purposes to protect incipient faults within the HV power equipment. Among these, solid insulation is widely used for high voltage equipment in high voltage power systems. Most insulation materials are not perfect in all respects and always contain some impurities. In high voltage (HV) electrical equipment, the quality of the insulation plays a very important role. Continued growth in the power system has provided the opportunity to protect equipment for healthy operation throughout its useful life.

scholarly journals Effect of High Voltage Impulses on Surface Discharge at the Oil-Paper Interface

2018 ◽  
Author(s):  
R Clemence Kizza ◽  
M Ghaffarian Niasar ◽  
R Nikjoo ◽  
X Wang ◽  
H Edin
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Electrical Power ◽  
Test Sample ◽  
Surface Discharge ◽  
Electrical Power Systems ◽  
Lightning Strikes ◽  
Complete Breakdown ◽  
Voltage Transients ◽  
Discharge Patterns

<p>High voltage transients in electrical power systems are mainly caused by lightning strikes and switching operations. The high voltage transients above the basic insulation level (BIL) would degrade the electrical insulation of the equipment.<br />In this work, the effect of high voltage impulses on the trend of the surface discharge at the oil-paper interface was investigated. The partial discharge patterns were recorded by the Insulation Condition Monitoring (ICM) system. The HV impulses were generated by a standard 1.2/50 μs HV impulse generator. The measurement results presented in this paper seem to show that surface<br />discharge would cause complete breakdown (continuous flashovers) at the oil-paper interface much faster when the test sample is first aged by HV impulses compared<br />to when it is unaged.</p>

Teaching Electrical Power Systems Using Computer Simulations

2003 ◽  
Vol 40 (1) ◽  
pp. 72-78 ◽  
Author(s):  
N. M. Shepstone
Keyword(s):  
Differential Equations ◽  
Power Systems ◽  
Electrical Power ◽  
Computer Code ◽  
Power Lines ◽  
Electrical Power Systems ◽  
Transient Behaviour ◽  
State Behaviour ◽  
Institute Of Technology ◽  
Overhead Power Lines

A computer program has been developed at the Manukau Institute of Technology that can be used for teaching and researching short, medium and long overhead power lines. The program makes use of interconnected icons rather than differential equations written in computer code (text). By using programs consisting of graphical icons it is far easier for students to visualise the power line that they are studying and in addition it makes it simple for them to modify and update the program. Until recently it has been difficult to teach overhead power lines in a meaningful way because the equations modelling the transient behaviour of lines are systems of differential equations and the equations modelling the steady-state behaviour are a set of hyperbolic (or exponential) equations. Both these sets of equations are difficult for students to visualise and interpret. Furthermore, overhead line laboratory exercises that produce realistic results for students are very difficult to arrange in most university laboratories. The program developed at Manukau Institute of Technology overcomes these problems.

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