scholarly journals Structural Analysis of Steel Transmission Towers for Large River Crossing of Overhead Transmission Lines

2020 ◽  
Vol 10 (6) ◽  
pp. 6438-6444
Author(s):  
M. S. Rechtman ◽  
J. N. M. Motta ◽  
A. Menezes ◽  
J. G. S. Da Silva ◽  
O. Longo
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Large River ◽  
Northern Region ◽  
Power Transmission Lines ◽  
New Materials ◽  
Design Standards ◽  
Overhead Transmission Lines ◽  
Transmission Towers ◽  
Structural Solutions

This study aims to investigate the structural behavior of steel transmission towers used for large river crossings. Design standards usually applied to analyze these structures don’t consider situations in which the transmission towers are used in river crossings. In Brazil, due to the fact that it is necessary to cross large areas owing to the rivers’ size, these towers assume great heights. It should be noted that the towers can weigh up to 24,500kN and exceed 300m in height. The current study develops an analysis that surpasses the existing standard methodologies, aiming for a structural optimization compatible with vast crossings and new materials, aiming to resolve this design challenge regarding power transmission lines. To do this, a river crossing spanning 2,300m, situated in the northern region of Brazil, was studied based on the use of three different conductor configurations, electrically equivalent, commonly used wind design standards, and structural solutions utilizing tubular and angle profiles.

scholarly journals An Investigation of Temperature and Wind Impact on ACSR Transmission Line Sag and Tension

2018 ◽  
Vol 8 (3) ◽  
pp. 3009-3012
Author(s):  
M. Z. Abbasi ◽  
B. Noor ◽  
M. A. Aman ◽  
S. Farooqi ◽  
F. W. Karam
Keyword(s):  
Environmental Stress ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Analysis Program ◽  
Temperature Changes ◽  
Overhead Transmission Lines ◽  
Transmission Towers ◽  
Surrounding Areas ◽  
Line Sag

Power transmission is mainly based on overhead transmission lines with conductors being supported by transmission towers. Transmission lines are subjected to environmental stress (temperature changes, winds, snow etc), have an impact on the surrounding areas (visual pollution, building restrictions) and experience heavy losses due to resistive, magnetic and capacitive effects. Thus, proper modeling and installation of these conductors are necessary. The conductors are generally installed in a catenary shape to minimize the capacitive effects and to balance the tension. This paper presents an investigation on the sag and tension behavior under different temperature and wind of ACSR (Aluminum Conductor-Steel Reinforced) lines. Four different cases of temperature and wind are tested to calculate sag and tension. Simulation setup is done in ETAP (electrical transient and analysis program). Results are recorded and discussed.

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.

scholarly journals Outage severity analysis and RAM evaluation of italian overhead transmission lines from a regional perspective

ACTA IMEKO ◽  
2016 ◽  
Vol 5 (4) ◽  
pp. 73
Author(s):  
Mohamed Khalil ◽  
Christian Laurano ◽  
Giacomo Leone ◽  
Michele Zanoni
Keyword(s):  
Transmission Lines ◽  
Power Plants ◽  
Power Transmission ◽  
Electrical Energy ◽  
Point Of View ◽  
Power Transmission Lines ◽  
Severity Factor ◽  
Overhead Transmission Lines ◽  
Maintenance Activities ◽  
Generation Power

<p>Power transmission lines represent the core of the High Voltage Network since they are responsible for the transport of the electrical energy from the generation power plants to the electrical substations. In this paper, an analysis of the outages occurred to the Italian Overhead Transmission Lines (OHTLs) from 2008 to 2015 is carried out. A new simple and effective reliability index, namely the Severity Factor, is introduced with the aim to drive the prioritization of the failure causes and the enhancement of the maintenance activities. The analysis has been performed focusing on the geographical distribution of the OHTLs. For each analyzed region, the voltage levels more prone to failure have been determined. The proposed methodology, thanks to the introduction of the Severity Factor, is a useful and effective tool for the identification of the transmission network criticalities and the enhancement of the related maintenance activities. Finally, an evaluation of the reliability, availability, safety and maintainability (RAMS) of the Italian OHTL network has been performed from a regional point of view.</p>

METHOD OF SYNTHESIS OF CLOSED-LOOP SYSTEMS OF ACTIVE SHIELDING MAGNETIC FIELD OF POWER TRANSMISSION LINES

2016 ◽  
Vol 2016 (4) ◽  
pp. 8-10 ◽  
Author(s):  
B.I. Kuznetsov ◽  
◽  
A.N. Turenko ◽  
T.B. Nikitina ◽  
A.V. Voloshko ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Transmission Lines ◽  
Closed Loop ◽  
Power Transmission ◽  
Power Transmission Lines ◽  
Closed Loop Systems ◽  
Active Shielding

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 Decentralized Estimation of Two-port Equivalents for Power Transmission Lines

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Vedanta Pradhan ◽  
O. D. Naidu ◽  
Sinisa Zubic ◽  
Patrick Cost
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Power Transmission Lines ◽  
Decentralized Estimation
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