Power transmission line magnetic fields: a survey on 120 kV overhead power transmission lines in Malaysia

2005 ◽  
Author(s):  
S.R. Azzuhri ◽  
W.N.L. Mahadi
Keyword(s):  
Magnetic Fields ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Power Transmission Line ◽  
Power Transmission Lines ◽  
Overhead Power Transmission Lines

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.

A multi-unit serial inspection robot for power transmission lines

2019 ◽  
Vol 46 (2) ◽  
pp. 223-234 ◽  
Author(s):  
Guanghong Tao ◽  
Lijin Fang
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Power Transmission Line ◽  
The Novel ◽  
Power Transmission Lines ◽  
Obstacle Crossing ◽  
Content Type ◽  
Inspection Robot ◽  
Serial Robot

Purpose The purpose of this paper is to introduce a robot mechanism designed for power transmission line inspection. The focus for this design is on obstacle-crossing ability with a goal to create a robot moving and crossing obstacle on not only the straight line but also the steering line. Design/methodology/approach A novel four-unit tri-arm serial robot mechanism is proposed. Every novel unit designed for pitching motion is based on parallelogram structure, which is driven by cables and only one motor. There is gripper-wheel compounding mechanism mounted on the arm. The prototype and obstacle environments are established, and the obstacle-crossing experiments are conducted. Findings The novel unit mechanism and robot prototype have been tested in the lab. The prototype has demonstrated the obstacle-crossing ability when moving and crossing fundamental obstacles on the line. The experimental results show that the robot mechanism meets the obstacle-crossing requirements. Practical implications The novel robot technology can be used for defect inspection of power transmission line by power companies. Social implications It stands to lower the intense and risk of inspection works and reduce the costs related to inspection. Originality/value Innovative features include its architecture, mobility and driving method.

scholarly journals Repair compositions for restoration of operated reinforced concrete structures

2021 ◽  
Vol 273 ◽  
pp. 04017
Author(s):  
Elena Shlyakhova ◽  
Irina Serebryanaya ◽  
Inna Egorochkina ◽  
Andrey Matrosov ◽  
Maxim Odinets ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Transmission Line ◽  
Transmission Lines ◽  
Life Support ◽  
Power Transmission ◽  
Technical Condition ◽  
Power Transmission Line ◽  
Power Transmission Lines ◽  
Operational Characteristics ◽  
Concrete Elements

Power transmission lines (PTL) are strategic objects, the reliability of which depends on the life support of the country. Most of the currently operated power transmission lines were put into operation in the twentieth century, and by now there is a problem of assessing their technical condition, repairing them, if necessary, and maintaining them in a working condition. Defects that appear during the operation of reinforced concrete elements of power transmission lines have different localization and degree of manifestation, but typical is the destruction of the surface layer of concrete with exposure of rebar, more often at the base of the power transmission line. The aim of the work is to select the optimal composition of the repair mixture based on non-shrinking and expanding cements, ensuring reliable adhesion of the repair compounds to the concrete of the structure, which will restore the bearing and operational characteristics in the repaired reinforced concrete elements of the power transmission line at the design level.

Prediction Model for Power Transmission Line Icing Load Based on Data-Driven

2010 ◽  
Vol 143-144 ◽  
pp. 1295-1299 ◽  
Author(s):  
Peng Li ◽  
Ning Li ◽  
Qi Mao Li ◽  
Min Cao ◽  
Huo Xing Chen
Keyword(s):  
Prediction Model ◽  
Transmission Line ◽  
Transmission Lines ◽  
Good Accuracy ◽  
Power Transmission ◽  
Training Data ◽  
Data Driven ◽  
Power Transmission Line ◽  
Power Transmission Lines ◽  
Accuracy Of Prediction

How to monitor and predict icing load of power transmission lines are important problems for the reliability of power grid. A model based on data-driven is presented here to predict the icing load of transmission line, which is available to forecast the icing disaster of it. The fitfulness, which influencing the prediction results of icing load, is analyzed and discussed in this paper. According to the results of simulation, this model has a good accuracy of prediction if the training data and prediction data are in the same icing process. If the icing process is not same but contiguous, it also can predict the degree of icing load qualitatively.

scholarly journals Electric and Magnetic Field Minimization using Optimal Phase Arrangement Techniques for MEA Overhead Power Transmission Lines

2021 ◽  
Vol 19 (1) ◽  
pp. 51-58
Author(s):  
Suthasinee Nunchuen ◽  
Vuttipon Tarateeraseth
Keyword(s):  
Magnetic Fields ◽  
Transmission Lines ◽  
Power Transmission ◽  
World Health ◽  
Power Transmission Lines ◽  
Electric And Magnetic Fields ◽  
Overhead Power Transmission Lines ◽  
Health Organization ◽  
The Mathematical Model ◽  
Phase Arrangement

In order to minimize the electric and magnetic fields generated by Metropolitan Electricity Authority (MEA) overhead power transmission lines, the optimal phase arrangement techniques were applied for 3-circuits overhead power transmission lines (69/230 kV). In this paper, the mathematical model was formulated using a MATLAB program which validated by comparing the simulated results with the measured results where the South Thonburi power transmission lines at Rama 2 Road (outbound side) were evaluated with the same conditions. Finally, it can be concluded that the optimal phase arrangement techniques can minimize the generated electric and magnetic fields lowering than that of the limitation given by the World Health Organization.

Research on 3D Inspection Simulation Training System of 500kV Power Transmission Lines

2013 ◽  
Vol 482 ◽  
pp. 394-399 ◽  
Author(s):  
Wen Xiang Xiang ◽  
Hao Luo ◽  
Zhi Peng Hu ◽  
Hong Wei Hu ◽  
Chuan Hu
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Simulation Training ◽  
Power Transmission ◽  
Training System ◽  
System Structure ◽  
Training Effect ◽  
Power Transmission Line ◽  
Power Transmission Lines ◽  
Inspection Work

Inspection work on power transmission line is an important link in the safe production of electric power, inspection staff training has always been attention of the power industry researchers. In order to improve learners training effect, we put forward a new form of teaching to inspect transmission lines with combined with simulation training. This paper analyzes the transmission line inspection requirements and the corresponding functions of the simulation system and the corresponding, then introduces the system structure, the abstract simulation training process, finally give the system application examples. Application results show that the 3D simulation training system of the power transmission line inspection can effectively guarantee training effect on the transmission line inspection technology.

Residual Voltage as Possible Cause of Equipment Damage and Risk for Personnel under Overhead Power Transmission Lines Outage. Part 2

2017 ◽  
Vol 6 (3) ◽  
pp. 24-33
Author(s):  
Н. Рубцова ◽  
N. Rubcova ◽  
А. Токарский ◽  
A. Tokarskiy ◽  
В. Рябченко ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Power Transmission Line ◽  
Power Transmission Lines ◽  
Residual Voltage ◽  
Idle Mode ◽  
Overhead Transmission Lines ◽  
Overhead Power Transmission Lines ◽  
Overhead Power Transmission Line ◽  
Possible Cause

This is continuation of the paper “Residual Voltage as Possible Cause of Equipment Damage and Risk for Personnel under Overhead Transmission Lines Outage. Part 1” where on the example of 500 kV overhead power transmission line (OHL) have been considered residual voltages arising between switch’s open contacts for each phase under outage of 500 kV OHL operating in idle mode. In the present paper have been carried out studies of residual voltages arising between phases switches under outage of 500 kV OHL. Maximal values of these resulting voltages exceed a double amplitude value of the OHL nominal phase value, and that may be the reason for a breakdown of the air gap between the switches, damage of the switches, and the risk for the personnel during a substation walk around.

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