Modified time-domain-scattering-parameter formulation for incident and reflected waves on lossless, nonuniform transmission lines

1994 ◽  
Vol 4 (6) ◽  
pp. 189-190
Author(s):  
Ching-Wen Hsue
Keyword(s):  
Transmission Lines ◽  
Time Domain ◽  
Scattering Parameter ◽  
Reflected Waves ◽  
Time Domain Scattering ◽  
Nonuniform Transmission Lines

scholarly journals Extending the Application of One-Terminal Fault Location Method Available in Actual Time Domain Relay

2020 ◽  
Author(s):  
Gustavo A. Cunha ◽  
Felipe V. Lopes ◽  
Tiago H. Honorato
Keyword(s):  
Transmission Lines ◽  
Time Domain ◽  
Traveling Wave ◽  
Fault Location ◽  
Reflected Waves ◽  
Location Method ◽  
Actual Time ◽  
The One

Traveling wave-based fault location has attracted more and more attention from industries worldwide. This theory allowed the implementation of functions in order to increase the reliability of the obtained fault location results. Among existing functions, the classical one-terminal method requires the detection of the wave reflected from the fault, which is still considered a challenging task. A commercial relay was released with a function able to identify these reflected waves by evaluating patterns and weighted hypotheses, identifying the wavefront most likely to be the one re ected from the fault. However, as this function is embedded into a relay, it is not possible to change the method settings. Thus, this paper presents a validation of this function which is implemented externally to the relay. Besides, its application is extended for transmission lines to which the relay can not be applied, such as huge HVDC lines.

Analysis of Nonuniform Transmission Lines With a Perturbation Technique in Time Domain

2020 ◽  
Vol 62 (2) ◽  
pp. 542-548
Author(s):  
Yin Zhang ◽  
Cheng Liao ◽  
Rui Huan ◽  
Yuping Shang ◽  
Haijing Zhou
Keyword(s):  
Transmission Lines ◽  
Time Domain ◽  
Perturbation Technique ◽  
Nonuniform Transmission Lines

DISCRETE TIME-DOMAIN ANALYSIS OF NONUNIFORM LOSSLESS COUPLED TRANSMISSION LINES

2005 ◽  
Vol 14 (05) ◽  
pp. 973-986 ◽  
Author(s):  
GHOLAMALI REZAI-RAD ◽  
AHMAD CHELDAVI
Keyword(s):  
Discrete Time ◽  
Transmission Lines ◽  
Time Domain ◽  
Continuous Time ◽  
Linear Filter ◽  
Ordinary Wave ◽  
Constant Matrix ◽  
Band Limited ◽  
Nonuniform Transmission Lines ◽  
Time Linear

In this paper, a discrete time-domain method to analyze multiple coupled nonuniform lossless transmission lines has been presented. The solution is based on the steplines approximation of the nonuniform transmission lines and quasi-TEM assumptions. Using steplines approximation, the system of coupled nonuniform transmission lines is decomposed into a large number of coupled steplines with different characteristics. Then, using modal decomposition method, the system of coupled partial differential equations for each step is decomposed to a set of uncoupled ordinary wave equation. Using time-domain approach and invoking the boundary condition at the discontinuities of the adjacent steps, each step is modeled as continuous time linear filter characterized by a time-domain transfer matrix. Finally, this continuous time linear filter (for band limited input signal), is modeled as a discrete time-domain linear filter with constant matrix coefficients using sampling theorem. The method proposed here can be implemented using general purpose software packages like MATLAB.

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