scholarly journals Impact of the Ground on the Series Impedance of Overhead Power Lines

2020 ◽  
Vol 7 (3) ◽  
pp. 47-54
Author(s):  
Anastázia Margitová ◽  
Michal Kolcun ◽  
Martin Kanálik
Keyword(s):  
Electrical Energy ◽  
Electric Power System ◽  
Power Lines ◽  
Electrical Parameters ◽  
Overhead Lines ◽  
Return Path ◽  
Overhead Power Lines ◽  
The Impact ◽  
Overhead Power Line ◽  
Series Impedance

An overhead power line is a structure used in the electric power system to transmit electrical energy. The performance of overhead power lines depends on their parameters. There are four basic electrical parameters of power lines: resistance, inductance, capacitance, and shut conductance. The paper focuses on the calculation of the series impedance of overhead lines (resistance and inductance) by three different methods (Carsonʹs method, Rüdenbergʹs method and the theory of complex penetration depth) considering the impact of the ground return path. There is also the comparison of these methods and their application on models of real power lines of different voltage levels provided in this paper.

scholarly journals Feasibility study on the use of oil-well tubing in construction of intermediate support for 6-10 kV high voltage overhead power lines in the development of oilfields

2019 ◽  
Vol 124 ◽  
pp. 05042
Author(s):  
A.N. Korkishko ◽  
O.A. Korkishko ◽  
A.A. Kosov
Keyword(s):  
Climatic Factors ◽  
Economic Feasibility ◽  
Power Lines ◽  
Oil Well ◽  
Overhead Lines ◽  
Intermediate Support ◽  
Technical Possibility ◽  
Overhead Power Lines ◽  
Office Software ◽  
The Impact

This article is devoted to assessing the technical effectiveness and economic feasibility of oilwell tubing in construction of intermediate supports for overhead power lines (6–10 kV) in the development of oil, gas and condensate field in the conditions of Far North. The article considers the technical possibility and economic feasibility of using the built-up cross section of the intermediate support of overhead lines consisting of two tubes welded together. The SCAD office software was used to calculate the strength of the proposed section for the design load, taking into account the impact of climatic factors. A comparative analysis of the construction cost was performed for 1 km of overhead power lines made of conventional materials and oil-well tubing. The calculations showed the feasibility of using this material for the construction of 6-10 kV overhead lines.

scholarly journals Assessment of the Risk of Damage to 110 kV Overhead Lines Due to Wind

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 556
Author(s):  
Andrew Lukas Chojnacki
Keyword(s):  
Wind Speed ◽  
Probability Density ◽  
Statistical Method ◽  
Wind Damage ◽  
Power Lines ◽  
Power Structures ◽  
Overhead Lines ◽  
Overhead Power Lines ◽  
Risk Of Wind Damage ◽  
The Impact

The article presents an assessment of the risk of damage to 110 kV overhead power lines as a result of the impact of wind of variable speeds on that equipment. A statistical method for the assessment of the reliability of power structures in conditions of variable strength of the structure and at variable exposure values is presented. This method is based on the analysis of the shape and mutual location of the distributions of the probability density of the momentary resistance (strength) of the tested structure and the exposures of variable values occurring in its surroundings. The risk of wind damage to 110 kV lines has been determined on the basis of many years of observations of wind speed and failure rate of the lines. Wind has been shown to be the fault factor or co-factor responsible for damage in one in five failures of such equipment. The final part of the article includes an analysis of the obtained results and their interpretation.

scholarly journals Reduction in the Electromagnetic Interference Generated by AC Overhead Power Lines on Buried Metallic Pipelines with Screening Conductors

Electricity ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 316-329
Author(s):  
Arturo Popoli ◽  
Leonardo Sandrolini ◽  
Andrea Cristofolini
Keyword(s):  
Electromagnetic Interference ◽  
Numerical Study ◽  
Unit Length ◽  
Soil Surface ◽  
Power Lines ◽  
Induced Voltage ◽  
Element Analysis ◽  
Cylindrical Steel ◽  
Overhead Power Lines ◽  
Overhead Power Line

This paper presents a numerical study on the reduction in the voltage and current induced on a 13.5 km buried metallic pipeline by an overhead power line. The mitigation effectiveness of different configurations and cross-section shapes of screening conductors is computed by means of a methodology that combines a 2D Finite Element Analysis with circuital analysis. A 35.72% reduction of the maximum induced voltage is obtained when 4 cylindrical steel screening conductors with 8 mm radius are buried 0.25m below the soil surface, along the pipeline path. The maximum induced pipeline current is reduced by 26.98%. A parametric study is also performed, to assess the influence of the per-unit-length admittance to earth of the screening conductors on the mitigation efficacy. The results show that screening conductors may help in reducing the inductive coupling between overhead power lines and buried metallic pipelines, and that the assumption of perfectly insulated screening conductors leads to an underestimation of the produced mitigation effect.

scholarly journals Inclinometric method for determining the mechanical state of an overhead power transmission line

2019 ◽  
Vol 124 ◽  
pp. 05022
Author(s):  
M.F. Sadykov ◽  
D.A. Yaroslavsky ◽  
D.A. Ivanov ◽  
V.A. Tyurin ◽  
T.G. Galiyeva ◽  
...  
Keyword(s):  
Transmission Line ◽  
Power Line ◽  
Power Lines ◽  
Wire Temperature ◽  
Overhead Transmission Line ◽  
The Status ◽  
Control Devices ◽  
The Wire ◽  
Overhead Power Lines ◽  
Overhead Power Line

Mechanical deformations when a wire is stretched causes its rotation around its axis, which allows obtaining additional information about the wire behavior in an overhead transmission line and considering it no longer as a group of sections from one span but as a whole interconnected section with redistribution of mechanical loads between spans. To determine the tensile strength of wire by its torsion, a method for determining the mechanical parameters of an overhead transmission line was developed. It is based on the inclinometric method and the theory of force calculation of steel ropes. This technique takes into account the torsion, the angle of inclination and the wire temperature. The technique is implemented in the system for monitoring the status of overhead power lines. It takes into account the torsion angle of the wire and helps to prevent emergencies on the overhead power line by determining the tensile strength of the wire, checking for defects in wires of the overhead power line and defects in the suspension armature. The monitoring system includes control devices, data collection and data processing center, a dispatcher software package. Control devices are installed directly on the wire/ground wire of an overhead power line and are used to measure the angle of rotation, the angle of inclination and the wire temperature. The data collection and data processing station processes them according to the developed methodology in specialized software. The system for monitoring the status of overhead power lines based on the inclinometric method helps to prevent emergencies and reduce the economic costs of maintaining and restoring overhead power lines.

scholarly journals COMPOSITE SUPPORTS OF OVERHEAD POWER LINES

2020 ◽  
Author(s):  
Kostiantyn Kartalapov
Keyword(s):  
Power Line ◽  
Power Lines ◽  
Restoration Work ◽  
Overhead Power Lines ◽  
Overhead Power Line

The article considers the feasibility of using composite supports during the replacement of overhead power lines, analyzes the relevance of these technologies. The advantages of composite overhead power line towers for construction, modernization and restoration work over traditional wooden and metal towers are substantiated.

scholarly journals Analysis of the Torsional Stability of Split Phases

2019 ◽  
Vol 62 (6) ◽  
pp. 503-513
Author(s):  
I. I. Sergey ◽  
Y. G. Panamarenka ◽  
Y. V. Potachits ◽  
N. A. Yudina
Keyword(s):  
High Voltage ◽  
Climatic Factors ◽  
Short Circuit ◽  
Low Frequency ◽  
Power Lines ◽  
Structural Elements ◽  
Stability Calculation ◽  
Overhead Lines ◽  
Torsional Stability ◽  
Overhead Power Lines

The specificity of overhead power lines is associated with the fact that the length of conductors between the supporting structures can reach tens of thousands of meters. Wires and their components are exposed to climatic factors, viz. wind, rain, ice, snow. As compared to other structural elements, conductors are of the highest flexibility and lowest rigidity, and, therefore, they are the most sensitive elements to these effects. Since the early fifties of the XX century, the increase in energy consumption has caused the construction of high and ultra-high voltage overhead lines with split phases. For these types of conductors, new forms of oscillations have been noticed in the areas between the struts, the essence of which is torqueing the split phase. As a result, there is a violation of the torsional stability of the phase: collision of wires in the middle of sub-span and friction of wires of stranded conductor against each other, which leads to damaging conductors and, as a consequence, to disruption of power supply to consumers. Almost any overhead lines may be subjected to oscillations of wires in the span under the influence of wind. One of the types of such mechanical oscillations is galloping, i. e. low-frequency oscillations of wires with an amplitude reaching the value of the boom of wire sagging, and, taking into account the possibility of elongation of the wire, even exceeding it. Fluctuations in the galloping can cause significant mechanical forces and last long enough to lead to the destruction of structural elements of power lines, viz. wires, insulators, fittings and even pillars. Due to the large amplitude of oscillations, conductors of neighboring phases can approach each other at an unacceptable distance, resulting in a short circuit. The boundary value problem of the torsional stability calculation of the split phase with a given multiplicity of splitting has been set and solved. The critical lengths of the sub-spans at which the stable violation of torsional stability is most likely have been determined. A computer program has been developed, which can be used in the design of high-voltage lines with split phase.

scholarly journals Modeling of Ice-Shedding from ACSR Power Line

2017 ◽  
Vol 67 (1) ◽  
pp. 45-54 ◽  
Author(s):  
Juraj Hrabovský ◽  
Roman Gogola ◽  
Justín Murín ◽  
Tibor Sedlár
Keyword(s):  
Numerical Analysis ◽  
Material Properties ◽  
Double Bundle ◽  
Power Line ◽  
Power Lines ◽  
Jump Height ◽  
Effective Material Properties ◽  
Ice Shedding ◽  
Overhead Power Lines ◽  
The Impact

Abstract In this contribution, the analysis of ice-shedding from Aluminium Conductor Steel Reinforced (ACSR) power lines is presented. The impact of the icing position on the overhead power lines, the resulting jump height, and impact on attachment tension points after ice-shedding is examined. In the numerical simulations the effective material properties of the ACSR conductor is calculated using the homogenisation method. Numerical analysis of one power line and double-bundle power lines with icing over the whole range or only on certain sections of single and double-bundle power lines are performed

scholarly journals Analysis of influence of external atmospheric factors on the accuracy of fault location on overhead power lines

2020 ◽  
Vol 178 ◽  
pp. 01057
Author(s):  
Olga Ahmedova ◽  
Anatoliy Soshinov ◽  
Natalia Shevchenko
Keyword(s):  
Fault Location ◽  
Short Circuit ◽  
Power Line ◽  
Power Lines ◽  
Electrical Grids ◽  
Short Circuits ◽  
Atmospheric Factors ◽  
Overhead Power Lines ◽  
Overhead Power Line ◽  
Emergency Mode

Devices of fault location are widespread in electrical grids. In overhead power lines of voltages of 10 kV and higher, such devices are based on measurements of parameters in emergency mode. These devices can be divided into two main groups: designed to determine fault location of short circuits and of ground short circuit. In both cases, when detecting fault location, analyzed are not only the current and voltage parameters at the accident time, but also the parameters of overhead power line. When analyzing equivalent circuits of power lines, approximate tabular values of direct and quadrature parameters are used. It was revealed, that the line parameters are significantly affected by external atmospheric factors: ambient temperature, soil moisture, wind strength and direction, ice formation, etc. To accurately determine the fault location, it is necessary to evaluate the influence of these factors on the linear parameters of the overhead line. The paper presents analysis of the influence of changes in atmospheric factors on parameters of overhead power line. A methodology for calculating the operation setpoints of the device for fault location in power line is given.

scholarly journals Analysis of the Condition and Monitoring of Emergency Power Outages in 10 kV Overhead Lines of the Oryol Region

2020 ◽  
Vol 178 ◽  
pp. 01074
Author(s):  
Igor Nikolaevich Fomin ◽  
Alexander Vladimirovich Vinogradov ◽  
Roman Pavlovich Belikov ◽  
Tatyana Anatolyevna Kudinova ◽  
Marat Firdenatovich Nizamiev
Keyword(s):  
Power Supply ◽  
Power Line ◽  
Power Lines ◽  
Efficiency Improvement ◽  
Reliable Operation ◽  
Power Outages ◽  
Overhead Lines ◽  
Uninterrupted Power Supply ◽  
Emergency Power ◽  
Overhead Power Lines

Efficiency improvement of modern production is associated with uninterrupted power supply to consumers. Power supply reliability to consumers is ensured by reliable operation of power lines. The number of outages depends on their condition and operation quality. An increase in the number of outages affects the further degradation of power line state, significantly reducing the resource of lines and equipment; and it takes a lot of time to find faults and eliminate them. Monitoring of power outages in overhead power lines will reduce the time of emergency elimination.1

Determining the Protective Grounding Conductor Impedance to Ensure Safety in Carrying out Work on the Disconnected Power Line

2020 ◽  
Vol 10 (10) ◽  
pp. 12-19
Author(s):  
Andrey V. GORSHKOV ◽  
Keyword(s):  
Inverse Problems ◽  
Power Line ◽  
Power Lines ◽  
Induced Voltage ◽  
Empirical Formulas ◽  
Multiple Measurements ◽  
Line Point ◽  
Overhead Power Lines ◽  
Overhead Power Line

It is proposed to ensure safety in carrying out work on a disconnected overhead power line by using a grounding conductor at the workplace having the impedance at which the induced voltage will be decreased down to permissible values. For reliably determining the necessary grounding conductor impedance, the results from multiple measurements of the induced voltage and current at the overhead power line point in which the work is carried out are used. Based on the results of measurements and solution of the inverse problems, empirical formulas for the functions of induced voltage and current in the considered place at which work on the overhead power line is carried out are determined. The necessary impedance of the grounding conductor at the workplace is determined using the obtained empirical formulas. As a result, a procedure has been developed using which it is possible to determine the grounding conductor impedance that ensures safety of work carried out at the considered place of the disconnected overhead power line whatever the combination of operating currents through the influencing overhead power lines.

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