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.

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.

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.

High-Ampacity Overhead Power Lines With Carbon Nanostructure–Epoxy Composites

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
V. S. N. Ranjith Kumar ◽  
S. Kumar ◽  
G. Pal ◽  
Tushar Shah
Keyword(s):  
Finite Element ◽  
Analytical Model ◽  
High Performance ◽  
Electrical Power ◽  
Power Lines ◽  
Fe Model ◽  
Carbon Nanostructure ◽  
Element Analysis ◽  
Core Diameter ◽  
Overhead Power Lines

Design of high-performance power lines with advanced materials is indispensable to effectively eliminate losses in electrical power transmission and distribution (T&D) lines. In this study, aluminum conductor composite core with carbon nanostructure (ACCC–CNS) coating in a multilayered architecture is considered as a novel design alternative to conventional aluminum conductor steel-reinforced (ACSR) transmission line. In the multiphysics approach presented herein, first, electrothermal finite element analysis (FEA) of the ACSR line is performed to obtain its steady-state temperature for a given current. Subsequently, the sag of the ACSR line due to self-weight and thermal expansion is determined by performing thermostructural analysis employing an analytical model. The results are then verified with those obtained from the FEA of the ACSR line. The electrothermal finite element (FE) model and the thermostructural analytical model are then extended to the ACCC–CNS line. The results indicate that the ACCC–CNS line has higher current-carrying capacity (CCC) and lower sag compared to those of the ACSR line. Motivated by the improved performance of the ACCC–CNS line, a systematic parametric study is conducted in order to determine the optimum ampacity, core diameter, and span length. The findings of this study would provide insights into the optimal design of high-performance 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 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.

On the Problem of Reliably Determining the Induced Voltage on a Disconnected Power Line

2021 ◽  
Vol 5 (5) ◽  
pp. 17-25
Author(s):  
Andrey V. GORSHKOV ◽  
◽  
Ilya V. KOROLEV ◽  
Olga S. SHCHERBACHEVA ◽  
◽  
...  
Keyword(s):  
Power Lines ◽  
Electrical Safety ◽  
Overhead Line ◽  
Induced Voltage ◽  
Single Measurement ◽  
Regulatory Documents ◽  
Methodological Errors ◽  
Overhead Power Lines ◽  
Methodological Guidelines ◽  
Significant Underestimation

An analysis of the current regulatory documents on electrical safety shows that the methodological guidelines for determining the induced voltage on disconnected overhead power lines (OHL) located near the operating OHL contain methodological and methodological errors. These errors can lead to a significant underestimation of the determined induced voltage. It has been established that the method specified in the regulatory documents for determining the maximum possible value of the induced voltage by means of a single measurement with subsequently multiplying the measured value by a certain recalculation factor k does not allow in principle to determine it reliably. To determine a reliable value at a certain point of the disconnected overhead line, in general, it is necessary to measure the induced voltage at the same point of the overhead line at different values of the currents affecting the overhead line. The article formulates the main and auxiliary tasks of determining the reliable values of the maximum possible induced voltage. The main principles of the methods for solving the stated tasks are considered.

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 The method of extending drone piloting autonomy when monitoring the technical condition of 6-10 kV overhead power lines

2019 ◽  
Vol 124 ◽  
pp. 02010 ◽  
Author(s):  
V. A. Chernyshov ◽  
A. E. Semenov ◽  
V. E. Bolshev ◽  
R. P. Belikov ◽  
M. Jasinski ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Technical Condition ◽  
Power Line ◽  
Power Lines ◽  
Radio Communication ◽  
Emergency Control ◽  
Aerial Vehicle ◽  
Servo Controller ◽  
Overhead Power Lines ◽  
Overhead Power Line

The paper considers options for the implementation of the technical condition monitoring of the of power supply system elements, the assessment of overgrowing of the power line routes using an unmanned aerial vehicle. A method for emergency control of an unmanned aerial vehicle used to monitor the technical condition of 6-10 kV overhead power lines has been proposed. This method is used in case of loss of radio communication between the unmanned aerial vehicle and the ground control station. The method is based on the activation of the automatic piloting system allowing the unmanned aerial vehicle flight to continue to the pre-determined emergency landing area. The autopilot is carried out by means of a servo controller and sensitive sensors reacting to the intensity of the electromagnetic field of a 6-10 kV overhead power line.

Observation of Natural Lightning-Induced Voltage on Overhead Power Lines

2012 ◽  
Vol 27 (4) ◽  
pp. 2350-2359 ◽  
Author(s):  
Li Cai ◽  
Jianguo Wang ◽  
Mi Zhou ◽  
Shaodong Chen ◽  
Jian Xue
Keyword(s):  
Power Lines ◽  
Induced Voltage ◽  
Overhead Power Lines
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