scholarly journals Method for control the mechanical parameters of overhead power lines based on improved inclinometry

2019 ◽  
Vol 21 (3) ◽  
pp. 160-171 ◽  
Author(s):  
M. P. Goryachev ◽  
M. F. Sadykov ◽  
D. A. Yaroslavskiy
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Power Lines ◽  
Mechanical Parameters ◽  
Power Transmission Lines ◽  
Mechanical Loads ◽  
Overhead Transmission Line ◽  
The Wire ◽  
Overhead Power Lines

Structural elements of overhead power transmission lines are experiencing both horizontal and vertical loads. Wires and cables are elements of the overhead power line, on which changes in mechanical loads are observed to a greater degree. This occurs due to the change in the tension force of the wire/cable depending on the temperature and the formation of icy-rime deposits on it, as well as fluctuations in wind gusts. The article describes the most common systems and methods for determining the mechanical loads on an overhead power transmission line. A method is proposed for calculating the mechanical loads on an overhead transmission line based on mathematical models of a flexible wire, rope and a model for determining ice deposits on wires, taking into account the rotation of the wire/cable around its axis. A comparison of the improved inclinometry method with the method developed earlier for the case of formation of ice deposits on the S-50 cable has been carried out. A comparison was made on the error in determining the tension of the S-50 ground-wire protection cable using the method developed to control the mechanical parameters of overhead power lines, which takes into account the wire/cable rotation around its axis and the method for determining icy-rime deposits developed earlier. The developed method allows determining the elongation of the wire/cable in the span with one anchor support, as well as the strength of its tension with greater accuracy. However, additional clarification is required due to the influence of the wind, the formation of icy-rime deposits of various shapes, as well as the structural limitations of the wire/cable rotation when attaching it to the support.

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 Investigation characteristics of partial discharges in artificial defects of power transmission lines

2020 ◽  
pp. 63-68
Author(s):  
D. A. Polyakov ◽  
◽  
N. A. Tereschenko ◽  
I. V. Komarov ◽  
K. I. Nikitin ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Phase Distribution ◽  
Partial Discharges ◽  
Power Lines ◽  
Voltage Source ◽  
Power Transmission Lines ◽  
Average Value ◽  
Cable Lines ◽  
Overhead Power Lines

The article describes the study of the characteristics of partial discharges (PD) in various types of artificial defects in cable lines. A total of 13 types of insulation defects are considered. The PD measurements are carried out using a high AC voltage source and a commercial PD recorder. For each type of defect, diagrams of the amplitude-phase distribution of PD (APDPD), the average value of the apparent discharge, and the PD intensity are obtained. The results of the study show that most of the defects of insulators of overhead power lines have a relatively high intensity of partial discharges with a small average apparent charge. In the samples of cable lines, relatively high values of intensity and average apparent discharge are recorded in the presence of a defect in the end seal and a defect in the ground electrode in the form of a needle. The results obtained can be used in the development of devices for detecting defects, as well as for expanding the base of diagrams (APDPD)

Research of High Voltage Transmission Line Monitoring System Based on GPRS and ZIGBEE

2012 ◽  
Vol 468-471 ◽  
pp. 2926-2930
Author(s):  
Shu E Zhang ◽  
Hao Wang
Keyword(s):  
Transmission Line ◽  
Monitoring System ◽  
Transmission Lines ◽  
Power Transmission ◽  
Meteorological Data ◽  
Mechanical Parameters ◽  
Power Transmission Lines ◽  
Important Indicator ◽  
Geographical Environment ◽  
Transmission Line Monitoring

The uncertainty of the geographical environment and climate in the power transmission lines leading to the safe operation of the power grid lines become an important indicator of reliability. Transmission line monitoring system monitors transmission line mechanical parameters and meteorological data in the operation. In order to realizing monitoring, prediction and positioning accurately in typical faults, ZIGBEE and GPRS are adopted to transmit mechanical parameters and meteorological data in monitoring system.

scholarly journals Soft Computing Methods for Fault Detection in Power Transmission Lines

2019 ◽  
Vol 9 (1S3) ◽  
pp. 246-250
Keyword(s):  
Fault Detection ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Computing Methods ◽  
Time Domain Reflectometry ◽  
Detection Methods ◽  
Physical Factors ◽  
Power Transmission Lines ◽  
Overhead Transmission Line

Communication is a major aspect of our day to day life and for maintaining the transmission of the data; electric power transmission lines play a major role in acting as the medium for this transmission. The transmission lines can further be differentiated as an overhead transmission line and underground transmission line. But the transmission is often hindered by the physical factors or generally known as faults. In the past few years, the implementation of the underground cable has seen an upsurge as these cables are not easily affected by the physical factors as the overhead cables are, as a result, there have been various methods adopted by the engineers for the analysis, detection and control of these faulty lines. Depending on the supply range of a particular nation different materials are used for the transmission lines. Different fault detection methods are used for the exact location of the fault and implementing that in a digitized way is the optimum solution. Whenever there is a fault the entire transmission line is affected, to ensure that the safety of the transmission line a governing system has been implied in our proposed work. Locating a fault requires various detection methods, one such method is the time domain reflectometry (TDR) which we have inculcated in our analysis of fault lines. This technique incorporates the transmission of a pulse down the cable, any change in the characteristics impedance will cause a part of the incident pulse to reflect back, this knowledge is helpful for locating discontinuities in a system.

scholarly journals Location of overhead power lines within Bukowe hills mesoregion in relation to the assessment of forest area fragmentation

2021 ◽  
Vol 3 ◽  
pp. 41-52
Author(s):  
Paweł Pieńkowski ◽  
◽  
Marcin Stoltman ◽  
Bogusław Zakrzewski ◽  
◽  
...  
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Natura 2000 ◽  
Forest Area ◽  
Power Lines ◽  
Power Transmission Lines ◽  
Investment Projects ◽  
Overhead Power Lines ◽  
The Impact ◽  
Forest Habitats

National power grid in Poland requires modernisation, therefore by 2030 numerous actions are scheduled regarding the expansion of the existing network and the construction of new electricity transmission lines (power lines). The planned activities will undoubtedly change the quality of landscape and result in fragmentation of forest habitats, some of which are characterised by high biodiversity and constitute a key element of ecological corridors. The aim of the present paper was to outline the issue of the impact of the power line corridors on forest habitat fragmentation, as well as to present the GuidosToolbox software (Graphical User Interface for the Description of image Objects and their Shapes) used, among other things, for the determination of the degree of fragmentation of forest habitats. The analysis concerned the Puszcza Bukowa forest, which is a part of the Natura 2000 network and is protected under the Szczecin Landscape Park ‘Puszcza Bukowa’. Despite abundant natural assets of the Puszcza Bukowa forest, it was necessary to run many power lines through its area due to location of the forest in the vicinity of the Szczecin agglomeration. The course of power lines contributed to the fragmentation of the discussed forest complex and to the depletion of its interior classified with the GuidosToolbox software as ‘Intact’. The software discussed in the present paper may prove useful in the identification of the degree of forest area fragmentation, connected with the course of high-voltage power transmission lines, and in the assessment of the impact of the planned investment projects on biocenoses.

scholarly journals Method for Calculating of Lightning Impact Level on Overhead Transmission Line

2021 ◽  
Vol 11 (14) ◽  
pp. 6609
Author(s):  
Anton Vladimirovich Burtsev ◽  
Vasily Nikolaevich Selivanov
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Power Lines ◽  
Power Transmission Lines ◽  
Overhead Line ◽  
Simple Method ◽  
Lightning Strikes ◽  
Overhead Lines ◽  
Overhead Transmission Line ◽  
Murmansk Region

This paper proposes a simple method for calculating the lightning impact level on overhead transmission power lines, taking into account its entire length. The method uses lightning historical data and the geographic coordinates of power line towers. It is based on calculating the distances between both arrays of lightning and of towers. The method has been tested on overhead lines in the Murmansk region of the Russian Federation and can be applied to any overhead line if a lightning dataset in the overhead line area is available. This study is useful for electric power suppliers because it provides valuable information about the most lightning-prone sections of overhead power lines. The method can also be beneficial to people selecting the optimal route (least amount of lightning strikes) for power transmission lines based on lightning density.

scholarly journals Time-Multiplexed Self-Powered Wireless Current Sensor for Power Transmission Lines

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1561
Author(s):  
Hao Chen ◽  
Zhongnan Qian ◽  
Chengyin Liu ◽  
Jiande Wu ◽  
Wuhua Li ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Current Measurement ◽  
Current Sensor ◽  
Power Transmission Line ◽  
Power Transmission Lines ◽  
Current Sensing ◽  
Self Powered

Current measurement is a key part of the monitoring system for power transmission lines. Compared with the conventional current sensor, the distributed, self-powered and contactless current sensor has great advantages of safety and reliability. By integrating the current sensing function and the energy harvesting function of current transformer (CT), a time-multiplexed self-powered wireless sensor that can measure the power transmission line current is presented in this paper. Two operating modes of CT, including current sensing mode and energy harvesting mode, are analyzed in detail. Through the design of mode-switching circuit, harvesting circuit and measurement circuit are isolated using only one CT secondary coil, which eliminates the interference between energy harvesting and current measurement. Thus, the accurate measurement in the current sensing mode and the maximum energy collection in the energy harvesting mode are both realized, all of which simplify the online power transmission line monitoring. The designed time-multiplexed working mode allows the sensor to work at a lower transmission line current, at the expense of a lower working frequency. Finally, the proposed sensor is verified by experiments.

scholarly journals Calculation of thermal field and ampacity of overhead power transmission lines using finite element method

2014 ◽  
Vol 17 (1) ◽  
pp. 16-29
Author(s):  
Long Van Hoang Vo ◽  
Tu Phan Vu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Transmission Lines ◽  
Power Transmission ◽  
Power Lines ◽  
Power Transmission Lines ◽  
Thermal Fields ◽  
Overhead Power Transmission Lines ◽  
Transmission And Distribution ◽  
Element Method

The population explosion and development of the national economy are two main causes of increasing the power demand. Besides, the Distributed Generations (DG) connected with the power transmission and distribution networks increase the transmission power on the existing lines as well. In general, for solving this problem, power utilities have to install some new power transmission and distribution lines. However, in some cases, the install of new power lines can strongly effect to the environment and even the economic efficiency is low. Nowadays, the problem considered by scientists, researchers and engineers is how to use efficiently the existing power transmission and distribution lines through calculating and monitoring their current carrying capacity at higher operation temperature, and thus the optimal use of these existing lines will bring higher efficiency to power companies. Generally, the current carrying capacity of power lines is computed based on the calculation of their thermal fields illustrated in IEEE [1], IEC [2] and CIGRE [3]. In this paper, we present the new approach that is the application of the finite element method based on Comsol Multiphysics software for modeling thermal fields of overhead power transmission lines. In particular, we investigate the influence of environmental conditions, such as wind velocity, wind direction, temperature and radiation coefficient on the typical line of ACSR. The comparisons between our numerical solutions and those obtained from IEEE have been shown the high accuracy and applicability of finite element method to compute thermal fields of overhead power transmission lines.

scholarly journals Design of Large Connectors of Overhead Power Lines

2018 ◽  
Vol 61 (5) ◽  
pp. 432-439 ◽  
Author(s):  
M. A. Korotkevich ◽  
N. V. Prokofieva
Keyword(s):  
Power Transmission ◽  
Power Lines ◽  
Traditional Theory ◽  
Engineering Structures ◽  
Cross Sectional ◽  
Flexible Filament ◽  
Nominal Voltage ◽  
The Wire ◽  
The Difference ◽  
Overhead Power Lines

It is found that the voltage at the lowest points of the wire or cable sag and at the points of their suspension on the pillars in the same span, determined in accordance with the properties of a perfectly flexible filament (similar to which the wires and cables are located in the span), differ slightly, and taking the difference of the mentioned values into account is only of methodologycal importance. The article presents the results of the calculation of wire and cable sag of large spans of power transmission line of 500 m or more length using both the traditional theory of the catenary line and the theory of equal resistance, when the cross-sectional area of a wire or cable, proportional to their tension, is considered variable in the span length, which provides the same probability of breaking them at any point of the span. When calculating the wires and cables in normal and emergency conditions, the largest sags are determined, which take place either at a higher ambient temperature or at a load of the wire with ice. The wire must be mounted in such a way as to ensure the normalized permissible dimensions to crossed engineering structures, water barriers or land, that are determined depending on the nominal voltage of the line. It is noted that the values of the wire and cable sags determined using the theory of the catenary line for the transition spans are less (although slightly) as compared to the data obtained on the basis of the theory of the equal resistance circuit. This must be taken into account in the design process.

Analysis of mathematical models of transmission lines.

2020 ◽  
Vol 23 (2) ◽  
pp. 16-19
Author(s):  
G. SHEINA ◽  
Keyword(s):  
Mathematical Model ◽  
Power Systems ◽  
Transmission Lines ◽  
Power Supply ◽  
Power Supply System ◽  
Power Transmission ◽  
Supply System ◽  
Power Lines ◽  
Power Transmission Lines ◽  
The Mathematical Model

This paper investigates a mathematical model of one elements of the power supply system - power transmission lines. The type of models depends on the initial simplifications, which in turn are determined by the complexity of the physics of processes. The task of improving the accuracy of modeling of emergency processes in the power system is due to the significant complexity of modern power systems and their equipment, high-speed relay protection, automation of emergency management and the introduction of higher-speed switching equipment. One of the reasons for a significant number of serious emergencies in the system is the lack of complete and reliable information for modeling modes in the design and operation of power systems. The development of a mathematical model of a three-phase power line, which provides adequate reflection of both normal and emergency processes, is relevant. The advanced mathematical model of power transmission lines allows to investigate various operational modes of electric networks. The improved mathematical model of the power transmission line reflects all the features of physical processes at state modes and transient process and provides sufficient accuracy of the results. The type of mathematical model of power transmission lines depends on the accepted simplifications, depending on the task of research. The purpose of this work is to analyze the mathematical model of the power transmission line to study the modes of operation of the power supply system, with the possibility of its application to take into account all the design features of overhead and cable power lines. The mathematical model of the power line for the study of the modes of operation of the power supply system is analyzed. It is used to take into account the design features of overhead and cable power lines, skin effect.

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