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 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 Comparative Analysis of High-Voltage Power Line Models for Determining Short-Circuit Currents in Towers Earthing Systems

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4729
Author(s):  
Rafał Tarko ◽  
Jakub Gajdzica ◽  
Wiesław Nowak ◽  
Waldemar Szpyra
Keyword(s):  
High Voltage ◽  
Current Distribution ◽  
Single Phase ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Power Line ◽  
Power Lines ◽  
Distribution Analysis ◽  
Short Circuits ◽  
Short Circuit Currents

The article deals with the problems of single-phase short-circuit current distribution in overhead power lines. Short-circuit disturbances cause many negative phenomena in power networks. Since experimental studies of short-circuits in real networks are practically impossible to perform, these effects can be evaluated only theoretically, based on short-circuit current calculations with the use of appropriate mathematical models. Although short-circuit modeling is considered to be one of the simplest power system calculations, the exact mathematical description of the phenomena occurring at short-circuits is complex. Simplified normative methods are often used for short-circuit current calculations; however, this does not give ground for a thorough analysis of short-circuit current distribution in power lines. The distributions are analyzed using power line models with different degrees of complexity in line with the assumptions made for a given model. The paper presents the problem of current distribution analysis in high-voltage overhead lines for single-phase faults to the tower structures. Simulation studies were conducted on the models developed for the calculation of short-circuit currents in the high-voltage power line earthing. The objective of the analysis was to assess the validity of simplification assumptions followed by practical recommendations on the applicability of the models.

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 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.

Device for contactless ice buildup monitoring of overhead power line wires

2021 ◽  
Vol 3 ◽  
pp. 5-11
Author(s):  
Alexandr Shilin ◽  
Alexey Shilin ◽  
Sergey Dementyev ◽  
Nadezhda Kuznetsova
Keyword(s):  
Video Recording ◽  
Power Line ◽  
Load Cell ◽  
Dew Point ◽  
Power Lines ◽  
Indirect Contact ◽  
Wire Temperature ◽  
Contact Sensor ◽  
Overhead Power Lines ◽  
Overhead Power Line

Ice buildup monitoring is essential to prevent wire breakage on overhead power lines. Conventional telemetry systems which are based on load cell sensors have some drawbacks as reflected in this paper. We suggest an innovative device for contactless ice buildup monitoring of overhead power line wires video recording the power line clearance. A specific algorithm for detecting the lowest point of wire sag has been provided. Also, we analyze a possibility of indirect contact sensor-free measurements of a wire temperature when the wire is being covered by icy deposits. A specific buildup type can be determined comparing a dew point and desublimation point as shown in this paper.

scholarly journals Development of the method of determining the location of a short circuit in transmission lines

2021 ◽  
Vol 2061 (1) ◽  
pp. 012033
Author(s):  
K Suslov ◽  
N Solonina ◽  
Z Solonina ◽  
A Akhmetshin
Keyword(s):  
Transmission Lines ◽  
Fault Location ◽  
Short Circuit ◽  
Search Time ◽  
Distribution Networks ◽  
Power Lines ◽  
Supply And Distribution ◽  
Short Circuits ◽  
Reliable Power Supply ◽  
Short Time

Abstract One of the serious problems of the reliable functioning of energy systems is the disruption of the performance of overhead and cable transmission power lines caused by various reasons. Most of the power outages occur in distribution networks. Particularly dangerous short-circuits in the supply and distribution network, due to unpredictable natural disasters. To ensure uninterrupted and reliable power supply to consumers, it is necessary to identify and eliminate the malfunction in a short time to reduce damage. Finding and troubleshooting a line is an important task. The authors proposed a method for quickly determining the location of a short circuit in power lines. The proposed method allows to reduce search time and increase the accuracy of determining the fault location.

Investigation of the Influence of the Electromagnetic Field in the Vicinity of High Voltage Overhead Line

2016 ◽  
Vol 856 ◽  
pp. 190-195 ◽  
Author(s):  
Atanas Chervenkov ◽  
Todorka Chervenkova
Keyword(s):  
High Voltage ◽  
Electromagnetic Compatibility ◽  
Short Circuit ◽  
Electrical Equipment ◽  
Power Line ◽  
Lightning Strike ◽  
Magnetic Flux Density ◽  
Fem Model ◽  
Overhead Power Line ◽  
Emergency Mode

The magnetic and electrical field in the vicinity of overhead power line for high voltage - 220 kV is investigated. FEM model is created. Simulations of normal and emergency mode of the power line are made. The electrical intensity at idle mode in some areas, close to overhead power line, creates a high voltage level for humans. It can create also disturbances in the electrical equipment and the vehicles. These surges violate electromagnetic compatibility. The magnetic induction at emergency mode – short circuit and lightning strike in the areas around the towers could give a disturbing reaction of humans, animals and sensitive electronic devices. One solution for decreasing of the magnetic flux density to acceptable values is offered.

scholarly journals Model of own harmonic conductor oscillations for tasks of monitoring the status of airline power transmission lines

2020 ◽  
Vol 22 (3) ◽  
pp. 97-106
Author(s):  
D. A. Yaroslavskiy ◽  
V. V. Nguyen ◽  
M. F. Sadykov ◽  
M. P. Goryachev ◽  
A. A. Naumov
Keyword(s):  
Transmission Lines ◽  
Mechanical Load ◽  
Power Line ◽  
The Body ◽  
Power Lines ◽  
Physical Pendulum ◽  
Mechanical Loads ◽  
Straight Line Passing ◽  
Overhead Power Lines ◽  
Overhead Power Line

The article substantiates the relevance of the inspection of overhead power lines by determining the mechanical loads of the conductors. The conductor sways under the action of external loads and variable internal mechanical loads. The conductor behaves in span like a pendulum. Using the inclinometric method, it is possible to determine the deviations of the conductor in space from its equilibrium position. Having restored the geometry of the conductor in the span of an overhead power line, mechanical loads can be determined. A model of the harmonic oscillations of the conductor in flight is derived to assess the mechanical loads of the conductor overhead power lines. This mathematical model is based on mathematical models of a flexible thread and a model of a physical pendulum. A conductor is a physical pendulum, where the conductor acts as the body, and in the role of the fixed axis of rotation, a straight line passing through the suspension points of the conductor. The developed model allows you to determine the arrow of its sag from the period of oscillations of the conductor in the span. The article considers algorithms for calculating the conductor sag arrows for two cases: the conductor suspension points are at the same height; conductor suspension points are at different heights. A theoretical calculation is given for a model of a span overhead power line with an estimate of the sensitivity of the developed model and its error in determining the sag of the conductor. Using the arrow of the conductor sag, you can restore its geometry, and hence the mechanical load of the conductor. Therefore, knowing the initial geometric parameters of the span of the overhead power line and the current period of the conductor’s oscillations, it is possible to examine its current state.

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.

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