Rational Damping Arrangement Design for Transmission Lines Vibrations: Analytical and Experimental Analysis

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
O. Barry ◽  
R. Long ◽  
D. C. D. Oguamanam
Keyword(s):  
Explicit Expression ◽  
Transmission Lines ◽  
Experimental Analysis ◽  
Power Lines ◽  
Rational Approach ◽  
Loop Length ◽  
Overhead Transmission Lines ◽  
Experimental Approaches ◽  
First Time ◽  
Good Agreement

The control of overhead transmission lines vibrations is achieved by Stockbridge dampers. However, the effectiveness of the damper is significantly dependent on its location on the conductor. This paper studies the arrangement of Stockbridge dampers on power lines vibrations using both analytical and experimental approaches. An explicit expression of the loop length is presented for the first time. This expression is used to determine the optimal damper location based on a rational approach. The effectiveness of the proposed approach is validated numerically and experimentally. The results show very good agreement and indicate that Stockbridge dampers are more effective for asymmetrical damping arrangement with the bigger counterweight oriented toward the tower.

On the vibration analysis of power lines with moving dampers

2017 ◽  
Vol 24 (18) ◽  
pp. 4096-4109 ◽  
Author(s):  
MA Bukhari ◽  
O Barry ◽  
E Tanbour
Keyword(s):  
Transmission Lines ◽  
Equations Of Motion ◽  
Power Lines ◽  
Governing Equations ◽  
Wind Force ◽  
Vibration Displacement ◽  
Mass System ◽  
Overhead Transmission Lines ◽  
Parametric Studies ◽  
Mass Spring

This work investigates the performance of a moving damper for overhead transmission lines. The damper or absorber consists of mass-spring-damper-mass system. The absorber is connected to a single conductor subjected to pretension and wind force. The governing equations of motion are obtained using Hamilton’s principle, and numerical analysis is carried out using MATLAB®. The model is validated by comparing the present results to those in the literature. Parametric studies are conducted to investigate the performance of the proposed absorber. The results indicate that a moving absorber can be more effective than a fixed absorber. It is also demonstrated that the vibration displacement decreases with increasing forcing frequency and decreasing absorber speed.

scholarly journals Dynamic Rating Management of Overhead Transmission Lines Operating under Multiple Weather Conditions

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1136
Author(s):  
Raquel Martinez ◽  
Mario Manana ◽  
Alberto Arroyo ◽  
Sergio Bustamante ◽  
Alberto Laso ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Weather Conditions ◽  
High Accuracy ◽  
Power Lines ◽  
Calculation Error ◽  
Practical Application ◽  
Estimation Errors ◽  
Temperature Calculation ◽  
Overhead Transmission Lines ◽  
Economic Constraints

Integration of a large number of renewable systems produces line congestions, resulting in a problem for distribution companies, since the lines are not capable of transporting all the energy that is generated. Both environmental and economic constraints do not allow the building new lines to manage the energy from renewable sources, so the efforts have to focus on the existing facilities. Dynamic Rating Management (DRM) of power lines is one of the best options to achieve an increase in the capacity of the lines. The practical application of DRM, based on standards IEEE (Std.738, 2012) and CIGRE TB601 (Technical Brochure 601, 2014) , allows to find several deficiencies related to errors in estimations. These errors encourage the design of a procedure to obtain high accuracy ampacity values. In the case of this paper, two methodologies have been tested to reduce estimation errors. Both methodologies use the variation of the weather inputs. It is demonstrated that a reduction of the conductor temperature calculation error has been achieved and, consequently, a reduction of ampacity error.

scholarly journals Coupling Between Separate Phases of Coaxial Double Circuit Transmission Lines

1988 ◽  
Vol 13 (2) ◽  
pp. 85-111
Author(s):  
M. Hamed
Keyword(s):  
Phase Shift ◽  
Transmission Lines ◽  
Magnetic Field Intensity ◽  
Mutual Effect ◽  
Mutual Inductance ◽  
Power Lines ◽  
Overhead Transmission Lines ◽  
External Point ◽  
The Magnetic Field ◽  
Circuit Power

The paper studies the so-called coaxial overhead transmission lines. The concentric phases are considered. The mathematical analysis for voltage and current is presented. The telegraphic equations of the double circuit power lines with the mutual effect between circuits are introduced. The condition for single circuit transmission line is checked. The mutual effect between both circuits is studied on the basis of the ratio between the two currents of both circuits. The appeared phase shift between the two vectors of currents is inserted in the investigation. The magnetic field intensity at an external point of a line is mathematically expressed. Its value is approximated for the purpose of zero mutual inductance between phases of the same circuit. The mutual inductance between the two nearest groups of phases due to the linkage flux for the studied line is formulated. Its dependency on the distance from the phases as well as on the ratio of currents of both circuits is analysed. Then, the effect of phase shift on the mutual inductance is investigated. An idea for the control of the ratio between currents of both circuits of a line is presented.

scholarly journals HTLS Conductors: A Way to Optimize RES Generation and to Improve the Competitiveness of the Electrical Market—A Case Study in Sicily

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
M. G. Ippolito ◽  
F. Massaro ◽  
C. Cassaro
Keyword(s):  
Transmission Lines ◽  
Renewable Energy Sources ◽  
Operating Conditions ◽  
Power Lines ◽  
Environmental Constraints ◽  
Electrical Systems ◽  
Overhead Transmission Lines ◽  
Electricity System ◽  
New Energy

Stringent environmental constraints make more difficult to identify new energy corridors and build new power lines. The increase in the generation of electricity from renewable energy sources (RESs) makes the operation of electrical systems increasingly difficult in some areas. The transmission system operators (TSOs), in Italy Terna, are forced to exploit the existing overhead transmission lines, increasing the possibility of dispatching energy, in particular RES, optimizing the transmission capacity. Therefore, after a brief presentation of the Sicilian electricity system and a brief description of high-temperature low-sag (HTLS) conductors, a case study is presented. It is shown how it is possible to optimize the dispatching from renewable sources and, finally, it is demonstrated how the use of HTLS conductor can contribute, together with other actions taken by the TSO, to the decrease of the zonal price of electricity, to the creation of a market with fewer constraints and to new operating conditions that increase the resilience of the electricity system in case of disturbances.

scholarly journals On the Power Lines—Electromagnetic Shielding Using Magnetic Steel Laminates

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7215
Author(s):  
Tatiana Damatopoulou ◽  
Spyros Angelopoulos ◽  
Christos Christodoulou ◽  
Ioannis Gonos ◽  
Evangelos Hristoforou ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Minimum Distance ◽  
Electronic Devices ◽  
Power Lines ◽  
Human Beings ◽  
Efficient Design ◽  
Element Analysis ◽  
Magnetic Steel ◽  
Good Agreement

Protection against the electromagnetic fields around high-voltage transmission lines is an issue of great importance, especially in the case of buildings near power lines. Indeed, the developed fields can be harmful for the habitants and electrical/electronic devices, so the implementation of appropriate measures to address the above electromagnetic interference issue is necessary in order to ensure the safety of both human beings and equipment. Several practices have been proposed to reduce the electric and the magnetic fields around overhead and underground transmission lines (minimum distance, shielded cables, anechoic chamber etc.). In this context, the scope of the current paper is the use of highly permeable magnetic sheets for shielding purposes, along with the development of an appropriate procedure, based on finite element analysis (FEA) for the efficient design of passive shielding. The simulation results are compared with laboratory measurements in order to confirm the adequacy of the proposed methodology. The good agreement between the FEA outcomes and the experimental results confirms that the developed FEA tool can be trustfully used for the design of the shielding means in the case of overhead or underground power lines.

Multicanonical Molecular Dynamics Simulation Study of the Liquid-Solid and Solid-Solid Transitions in Lennard-Jones Clusters

2011 ◽  
Author(s):  
Toshihiro Kaneko ◽  
Kenji Yasuoka ◽  
Ayori Mitsutake ◽  
Xiao Cheng Zeng
Keyword(s):  
Molecular Dynamics ◽  
Heat Capacity ◽  
Transition Temperature ◽  
Peak Position ◽  
Temperature Curve ◽  
Dynamics Simulation ◽  
Lennard Jones ◽  
Dynamics Simulations ◽  
First Time ◽  
Good Agreement

Multicanonical molecular dynamics simulations are applied, for the first time, to study the liquid-solid and solid-solid transitions in Lennard-Jones (LJ) clusters. The transition temperatures are estimated based on the peak position in the heat capacity versus temperature curve. For LJ31, LJ58 and LJ98, our results on the solid-solid transition temperature are in good agreement with previous ones. For LJ309, the predicted liquid-solid transition temperature is also in agreement with previous result.

Modeling of overhead transmission lines for trapped charge discharge rate studies

2021 ◽  
Vol 198 ◽  
pp. 107343
Author(s):  
J. Morales ◽  
J. Mahseredjian ◽  
I. Kocar ◽  
H. Xue ◽  
A. Daneshpooy
Keyword(s):  
Transmission Lines ◽  
Discharge Rate ◽  
Overhead Transmission Lines ◽  
Charge Discharge ◽  
Trapped Charge
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