Determining the elastic factor for an ecotechnic assessment of Medium Voltage (MV) transmission lines with a consideration of the conductor’s skin effect

2019 ◽  
pp. 22-27
Author(s):  
L.X. Thanh
Keyword(s):  
Transmission Lines ◽  
Skin Effect ◽  
Medium Voltage

scholarly journals Modeling Features of a Single Phase-to-Earth Fault in a Medium Voltage Overhead Transmission Line

2020 ◽  
Vol 4 (2) ◽  
pp. 127-138
Author(s):  
Ismael Saeed ◽  
Kamal Sheikhyounis
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Single Phase ◽  
Single Frequency ◽  
Mathematical Representation ◽  
Medium Voltage ◽  
Overhead Transmission Line ◽  
Earth Fault ◽  
Distributed Parameters ◽  
Selection Of

The modeling and calculation of a single phase-to-earth fault of 6 to 35 kV have specific features when compared with circuits with higher nominal voltages. In this paper, a mathematical analysis and modeling of a 3-phase overhead transmission line with distributed parameters consisting of several nominal T-shaped, 3-phase links with concentrated parameters replaced by 1 nominal T-shaped link were carried out. Further analysis showed that not accounting for the distributed nature of the line parameters did not cause significant errors in the assessment of the maximum overvoltage in the arc suppression in single phase-to-earth faults, and that sufficient accuracy insures the representation of the line by only 1 nominal T-shaped, 3-phase link. Such a modeling technique makes it impossible to identify the location of single-phase faults, which is the property of higher harmonic amplification of individual frequencies. Chain equivalent schemas with constant parameters are valid for a single frequency, thereby providing an opportunity to study the nature of the wave process by the discrete selection of parameters. Next in the mathematical representation, we consider the overhead transmission lines as lines with distributed parameters.

scholarly journals Optimization of Radio Interference Levels for 500 and 600 kV Bipolar HVDC Transmission Lines

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3187 ◽  
Author(s):  
Carlos Tejada-Martinez ◽  
Fermin P. Espino-Cortes ◽  
Suat Ilhan ◽  
Aydogan Ozdemir
Keyword(s):  
Transmission Lines ◽  
Skin Effect ◽  
Ground Plane ◽  
Radio Interference ◽  
Transmission Line Model ◽  
Hvdc Transmission ◽  
High Voltage Direct Current ◽  
Hvdc Transmission Lines ◽  
Voltage Frequency ◽  
Optimal Values

In this work, a method to compute the radio interference (RI) lateral profiles generated by corona discharge in high voltage direct current (HVDC) transmission lines is presented. The method is based on a transmission line model that considers the skin effect, through the concept of complex penetration depth, in the conductors and in the ground plane. The attenuation constants are determined from the line parameters and the bipolar system is decoupled by using modal decomposition theory. As application cases, ±500 and ±600 kV bipolar transmission lines were analyzed. Afterwards, parametric sweeps of five variables that affect the RI levels are presented. Both the RI and the maximum electric field were calculated as a function of sub-conductor radius, bundle spacing, and the number of sub-conductors in the bundle. Additionally, the RI levels were also calculated as a function of the soil resistivity, and the RIV (radio interference voltage) frequency. Following this, vector optimization was applied to minimize the RI levels produced by the HVDC lines and differences between the designs with nominal and optimal values are discussed.

Velocity of Propagation in Transmission Lines

1998 ◽  
Vol 35 (1) ◽  
pp. 79-86
Author(s):  
Ivanil S. Bonatti ◽  
Pedro L. D. Peres ◽  
Amauri Lopes
Keyword(s):  
Transmission Lines ◽  
Skin Effect ◽  
Electrical Engineering ◽  
Propagation Time ◽  
Time Simulation ◽  
Lossy Transmission ◽  
Velocity Of Propagation ◽  
Simulation Results ◽  
Parseval’S Theorem

This paper discusses the skin effect on lossy transmission lines in the context of undergraduate electrical engineering courses. A new definition for propagation time derived from Parseval's theorem is proposed. In lossless transmission lines the proposed definition produces the conventional results and for lossy lines it matches quite exactly with the time simulation results, as shown by an illustrative example.

Simplified skin-effect formulation for power transmission lines

2014 ◽  
Vol 8 (2) ◽  
pp. 47-53 ◽  
Author(s):  
José Humberto A. Monteiro ◽  
Omar Mohamed O. Gatous ◽  
José Pissolato ◽  
Eduardo Coelho M. Costa ◽  
André Jinno G. Pinto ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Skin Effect ◽  
Power Transmission ◽  
Power Transmission Lines

The Effects of Load Impedance, Line Length, and Branches in the BPLC—Transmission-Lines Analysis for Medium-Voltage Channel

2007 ◽  
Vol 22 (4) ◽  
pp. 2156-2162 ◽  
Author(s):  
Justinian Anatory ◽  
Nelson Theethayi ◽  
Mussa M. Kissaka ◽  
Nerey H. Mvungi ◽  
Rajeev Thottappillil
Keyword(s):  
Transmission Lines ◽  
Line Length ◽  
Load Impedance ◽  
Medium Voltage

Correlation between Surface Conductivity and Pollution Flashover Voltage of Strain Insulator-String

2013 ◽  
Vol 431 ◽  
pp. 202-206 ◽  
Author(s):  
Shan Li ◽  
Jun Ping Zhang ◽  
Liang Gu ◽  
Jia De Liu
Keyword(s):  
Transmission Lines ◽  
Early Warning ◽  
Monitoring And Control ◽  
Remote Communication ◽  
Monitoring And Control System ◽  
Medium Voltage ◽  
Power Load ◽  
Pollution Flashover ◽  
Flashover Voltage ◽  
The Stability

For contamination of the medium voltage insulatorsXP-7 strain insulator-string, analysis of localized pollution flashover accident in recent years with a surface of insulator contamination degree of relationship, through the surface of porcelain insulator pollution layer conductivity indicators and calculation analysis on pollution flashover voltage, promote different voltage contaminated insulator under replacing the feasibility of early warning. Results showed that, the relationship between pollution flashover voltage and conductivity parameters is clear, available with microprocessor and more intuitive remote communication unit for remote monitoring and control system of early warning, reduce default phase pollution flashover accident of the power ring network of transmission lines in remote areas , enhance the stability of power load .

Suppression of the skin effect in radio frequency transmission lines via gridded conductor fibers

2016 ◽  
Vol 108 (8) ◽  
pp. 083502 ◽  
Author(s):  
Ian A. D. Williamson ◽  
Thien-An N. Nguyen ◽  
Zheng Wang
Keyword(s):  
Radio Frequency ◽  
Transmission Lines ◽  
Skin Effect
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