Transmission Lines of "Unusual" Cross-Section

2013 ◽  
pp. 201-230
Keyword(s):  
Cross Section ◽  
Transmission Lines

scholarly journals The Way of Reducing Current Values in Optical Ground Wires at Asymmetrical Faults on Overhead Transmission Lines

2016 ◽  
Vol 11 (1) ◽  
pp. 13-20
Author(s):  
Georgiy Egamnazarov
Keyword(s):  
Cross Section ◽  
Transmission Lines ◽  
Conclusive Evidence ◽  
Fault Current ◽  
Overhead Lines ◽  
Optical Cable ◽  
Electric Power Grid ◽  
Three Phase ◽  
Wire Steel ◽  
Wire System

Abstract Given the fact that the installing costs of an optical ground wire on overhead lines directly depend on its cross-section, which in turn depends on the level of fault current it should withstand, in order to reduce these current values in the optical ground wire, I suggested performing its isolated descents from the end towers of the line with its transition to an optical cable. The research was carried out on the example of a 500 kV overhead line in the National Electric Power Grid. The Method of Symmetrical Components for calculating asymmetrical fault currents was not used; therefore, calculations were carried out on the base of presenting the line as a multi-wire system for the considered case as a five-wire system (optical ground wire, steel ground wire, and three phase wires). Such approach allows taking into account the initial asymmetry of the line parameters and modeling any kind of asymmetrical faults. The analyses of calculated results were performed. The conclusive evidence that the optical ground wire isolated descents from the end towers of the line give the possibility of reducing the level of maximal fault current distribution values in it and therefore its cross section, is presented.

The Economic Analysis of Large Cross-Section Conductor in ±800kV DC Project

2013 ◽  
Vol 753-755 ◽  
pp. 3194-3197
Author(s):  
Hai Ying Zhou ◽  
Chun Lei Bu ◽  
Ming Jiang
Keyword(s):  
Economic Analysis ◽  
Cross Section ◽  
Transmission Lines ◽  
Social Economic ◽  
Construction Cost ◽  
Economic Benefits ◽  
Large Cross Section ◽  
Safe Operation ◽  
Key Issues

Conductor scheme is one of most key issues in the design of the transmission lines project, and it is significant for the construction cost and safe operation of transmission lines project. It can be aslo concluded from analysis on application of existing conductor that the appropriate decrease of number of bundle conductor and increase of the conductor cross-section will reduce lines loss, which has remarkable social-economic benefits. In this paper, the economic analysis of large cross-section conductor is conducted based on ±800kV DC Project. Some useful suggestions are given.

scholarly journals Free space transmission lines in receiving antenna operation

2019 ◽  
Author(s):  
Reuven Ianconescu ◽  
Vladimir Vulfin
Keyword(s):  
Plane Wave ◽  
Cross Section ◽  
Incident Wave ◽  
Transmission Lines ◽  
Incident Plane Wave ◽  
Software Simulation ◽  
Incident Plane ◽  
Receiving Antenna ◽  
Scattering Matrices ◽  
Simulation Results

This work derives exact expressions for the voltage and current induced into a two conductors non isolated transmission lines by an incident plane wave. The methodology is to use the transmission line radiating properties to derive scattering matrices and make use of reciprocity to derive the response to the incident wave. The analysis is in the frequency domain and it considers transmission lines of any small electric cross section, incident by a plane wave from any incident direction and any polarisation. The analytic results are validated by successful comparison with ANSYS commercial software simulation results, and compatible with other published results.

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