A novel algorithm for HVDC line fault location based on variant travelling wave speed

2011 ◽  
Author(s):  
Zhang Yi-ning ◽  
Liu Yong-hao ◽  
Xu Min ◽  
Cai Ze-xiang
Keyword(s):  
Wave Speed ◽  
Fault Location ◽  
Travelling Wave ◽  
Hvdc Line ◽  
Novel Algorithm

Travelling Wave Fault Location for Distribute Cable Network Based on Distributed Measurement

2013 ◽  
Vol 373-375 ◽  
pp. 976-980
Author(s):  
Yan Xu ◽  
Shi Qiu ◽  
Di Feng Shi ◽  
Guo Lin Huang
Keyword(s):  
Wave Speed ◽  
Fault Location ◽  
Travelling Wave ◽  
Transient Wave ◽  
Grounding Resistance ◽  
Location Method ◽  
Cable Network ◽  
Type D ◽  
Transmission Distance ◽  
Distributed Measurement

This template carries out a three-terminal accurate fault location method for distribute cable network. It is improved from type D principle fault location method. Radial distribution network is decomposed into T-type networks. A set of formulas based on three-terminal data can calculate fault distance and find fault branch. Only first transient wave heads is needed. Shorter transmission distance makes it more accurate to extract first wave heads with wavelet. The distributed measurement offers redundant transient voltage data. These data is fully used to improve location success rate and accuracy. The simulation result in ATP-EMTP shows that the location accuracy isnt influenced by wave speed, catadioptric wave, grounding resistance and initial fault phase angle.

A REACTION–DIFFUSION–ADVECTION EQUATION WITH COMBUSTION NONLINEARITY ON THE HALF-LINE

2018 ◽  
Vol 98 (2) ◽  
pp. 277-285
Author(s):  
FANG LI ◽  
QI LI ◽  
YUFEI LIU
Keyword(s):  
Boundary Condition ◽  
Wave Speed ◽  
Reaction Diffusion ◽  
Robin Boundary Condition ◽  
Travelling Wave ◽  
Half Line ◽  
Advection Equation ◽  
The Right ◽  
Combustion Nonlinearity ◽  
Robin Boundary

We study the dynamics of a reaction–diffusion–advection equation $u_{t}=u_{xx}-au_{x}+f(u)$ on the right half-line with Robin boundary condition $u_{x}=au$ at $x=0$, where $f(u)$ is a combustion nonlinearity. We show that, when $0<a<c$ (where $c$ is the travelling wave speed of $u_{t}=u_{xx}+f(u)$), $u$ converges in the $L_{loc}^{\infty }([0,\infty ))$ topology either to $0$ or to a positive steady state; when $a\geq c$, a solution $u$ starting from a small initial datum tends to $0$ in the $L^{\infty }([0,\infty ))$ topology, but this is not true for a solution starting from a large initial datum; when $a>c$, such a solution converges to $0$ in $L_{loc}^{\infty }([0,\infty ))$ but not in $L^{\infty }([0,\infty ))$ topology.

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