An Improvement of a Conductor Subdivision Method for Calculating the Series Impedance Matrix of a Transmission Line Considering the Skin and Proximity Effects

2008 ◽  
Vol 128 (1) ◽  
pp. 254-261 ◽  
Author(s):  
Toru Miki ◽  
Taku Noda
Keyword(s):  
Transmission Line ◽  
Proximity Effects ◽  
Impedance Matrix ◽  
Series Impedance

An adapted filament model for accurate modeling of printed coplanar lines with significant surface roughness and proximity effects

2010 ◽  
Vol 2 (3-4) ◽  
pp. 273-281 ◽  
Author(s):  
Brian Curran ◽  
Ivan Ndip ◽  
Christian Werner ◽  
Veronika Ruttkowski ◽  
Marcus Maiwald ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Transmission Line ◽  
Cross Sections ◽  
Skin Effect ◽  
New Technologies ◽  
Skin Depth ◽  
Proximity Effects ◽  
Roughness Effects ◽  
Average Deviation ◽  
The Impact

New technologies have resulted in transmission lines that deviate significantly from the intended rectangular cross sections. Trapezoidal cross sections and roughness that penetrate a significant depth into the surface in comparison to the skin-depth of the conductor can cause a very significant deviation in transmission line parameters from predicted values. Proximity effect further complicates the analysis by increasing losses and changing the impact of surface roughness by changing the current distribution. A skin-effect filament model that combines a traditional skin-effect filament modeling concept with traditional surface roughness modeling concepts is presented that accounts for surface roughness effects and non-ideal cross sections. The new technique models the transmission line non-idealities in a combined way with the current density in the signal and return current paths. This adapted filament model shows an average deviation of less than 2% above 1 GHz with one given transmission line measurement and does not have the computational challenges seen in a 3D full-wave solver.

Iterative Fault Location Scheme for a Transmission Line Using Synchronized Phasor Measurements

2007 ◽  
Vol 8 (6) ◽  
Author(s):  
Sukumar M Brahma
Keyword(s):  
Transmission Line ◽  
Fault Location ◽  
Positive Sequence ◽  
Impedance Matrix ◽  
Fault Resistance ◽  
Distributed Parameters ◽  
Phasor Measurements ◽  
Sequence Components ◽  
Simulation Results ◽  
New Iterative Method

This paper describes a new iterative method to locate fault on a single transmission line. The method uses synchronized voltage and current measurements from both line terminals. Using the positive sequence components of the pre-fault and the post-fault phasors, positive sequence source impedances at both terminals are first estimated. Using these source impedances and the line data, the positive sequence bus impedance matrix (Zbus) is formed. Using the properties of Zbus, an iterative algorithm is proposed to locate the fault. This algorithm is tested extensively with data obtained from the EMTP simulation of a long transmission line simulated with distributed parameters in the presence of fault resistance and CT saturation. The simulation results show that the method is very accurate and robust.

Skin and proximity effects in the series-impedance of three-phase underground cables

2016 ◽  
Vol 130 ◽  
pp. 132-138 ◽  
Author(s):  
Ana Isabel Brito ◽  
V. Maló Machado ◽  
M.E. Almeida ◽  
M. Guerreiro das Neves
Keyword(s):  
Proximity Effects ◽  
Underground Cables ◽  
Three Phase ◽  
Series Impedance
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