Model comparison of voltage-current relation for ionized soils produced by lightning impulse current

2016 ◽  
Author(s):  
Angie R. Ramos ◽  
Carlos A. Bernal ◽  
Herbert E. Rojas
Keyword(s):  
Model Comparison ◽  
Lightning Impulse ◽  
Impulse Current

Neural Network Model to Estimate Resistivity of Ground Enhancers Reinforced with Graphene Nano Particles for Transmission Lines

2019 ◽  
Vol 58 ◽  
pp. 139-150
Author(s):  
Isaias Ramirez-Vazquez ◽  
Miguel Ramirez-Gonzalez ◽  
J. Eduardo Salgado-Talavera
Keyword(s):  
Neural Network ◽  
Network Model ◽  
Neural Network Model ◽  
Transmission Lines ◽  
Nano Particles ◽  
Grounding System ◽  
Surge Arresters ◽  
Lightning Impulse ◽  
Graphene Nanoparticles ◽  
Impulse Current

For many high voltage transmission lines, lightning is the first cause of outages. Different alternatives have been used to diminish these outages, like the use of counterpoise wires, installation of surge arresters, and the improvement of the grounding system using ground enhancers or chemical enhancers. In this paper, graphene nanoparticles were used to reformulate commercial ground enhancers. The results of this research end up in an improvement factor of up to 100 times the reduction in resistivity, when graphene nanoparticles are used. After lightning current impulse tests done on both types of samples, the performance of the un-reformulated ground enhancer samples shows a faster deterioration than the graphene reinforced ground enhancer samples. In order to establish a criterion to quantitatively rank the chemical ground enhancers ́ performance after the lightning impulse current tests, a neural network model was developed.

scholarly journals A Study on the Change of the Characteristics of Metal Oxide Element by Application of Lightning Impulse Current

1997 ◽  
Vol 117 (5) ◽  
pp. 749-750
Author(s):  
Katsuji Igarashi ◽  
Norihiko Ichise ◽  
Eisaku Oho ◽  
Norio Baba ◽  
Teruya Kouno ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Lightning Impulse ◽  
Impulse Current

scholarly journals Transient impedance of grounding system with impulse superimposed sinewave

2021 ◽  
Vol 1 (1) ◽  
pp. 8-12
Author(s):  
Sherif Ghoneim ◽  
Ahdab Elmorshedy ◽  
Rabah Amer
Keyword(s):  
System Configuration ◽  
System Operation ◽  
Grounding System ◽  
Several Variables ◽  
Wire Conductor ◽  
Lightning Impulse ◽  
In Series ◽  
Grid Side ◽  
Soil Ionization ◽  
Impulse Current

Investigating the transient performance of grounding systems subject to lightning (impulse or impulse superimposed sinewave) is valuable for protecting the power system and maintaining the system operation. In this work, the grounding system's impedance is computed when an impulse superimposed sinewave is applied to the grounding grid's proposed lumped circuit and grounding system can be simulated as an inductance in series with resistance, and all of them are in parallel with capacitance based on Thione's assumption. Several variables were investigated to study their effects on the grounding system's behavior. The variables were the soil resistivity, soil permittivity, main wire length, grid conductor radius, grid side length, grid configurationand its mesh number. The grounding system configuration  varied between square and rectangular shapes, which connects to the protecting rod via the main wire conductor. A 3.69 kA peak of impulse current was applied to avoid soil ionization. The results indicated the performance of the grounding system when subjecting to impulse current.

10/350 µs Lightning Impulse Current Behavior of a Conductive Fabric

2021 ◽  
Author(s):  
Francisco Roman ◽  
Daniel Rodriguez ◽  
Mahbubur Rahman ◽  
Andre Lobato ◽  
Jorge Rodriguez ◽  
...  
Keyword(s):  
Conductive Fabric ◽  
Lightning Impulse ◽  
Impulse Current ◽  
Current Behavior

Performance degradation of YBa2Cu3O7-δ tapes after suffering lightning impulse current

2014 ◽  
Vol 104 (11) ◽  
pp. 112602 ◽  
Author(s):  
J. Sheng ◽  
H. Sun ◽  
X. Liu ◽  
Z. Jin ◽  
Z. Hong
Keyword(s):  
Performance Degradation ◽  
Lightning Impulse ◽  
Impulse Current

scholarly journals Effects of Soil Profile on the Transient Performance of Substation Grounding System

2020 ◽  
Vol 20 (2) ◽  
pp. 870
Author(s):  
Zulkurnain Adul Malek ◽  
Mohammad Shahrin Affendy Yaman ◽  
Muhammad Adnan
Keyword(s):  
Single Layer ◽  
Current Amplitude ◽  
Transient Performance ◽  
Grounding System ◽  
Step Voltage ◽  
Lightning Current ◽  
Grounding Grid ◽  
Lightning Impulse ◽  
Touch Voltage ◽  
Impulse Current

<table width="593" border="1" cellspacing="0" cellpadding="0"><tbody><tr><td valign="top" width="387"><p>Lightning transient characteristic of the grounding grid is fundamental for optimum performance of lightning protection of a substation. In order to design an appropriate grounding system for such substation, it is important to study its transient characteristics because the high impulse current is significantly different compared to power frequency current. In this paper, substation grounding grid model was developed using CDEGS software to analyze the grid transient performance in terms of ground potential rise (GPR), touch voltage and step voltage when the grounding system is struck by a lightning impulse current. Several parameters, such as lightning current amplitude, feed point and the number of sub-grids, were altered to study their relationship with the transient performance. The maximum transient GPR, touch voltage, and step voltage increase as the lightning current amplitude increase. The maximum transient GPR and step voltage are the highest at the corner of the grounding grid while the maximum touch voltage is the highest at the centre of the grounding grid. In addition, the maximum transient GPR and step voltage decrease when the number of sub-grid increases. In contrast, the touch voltage slightly increases as the number of sub-grid increases. The maximum transient GPR, and step voltage are the highest at the 2-layer and the lowest at the uniform soil or single-layer soil.</p></td></tr></tbody></table>

FDTD Analysis of Lightning Impulse Current Distribution Inside of ZnO Varistor Element

2016 ◽  
Vol 136 (11) ◽  
pp. 839-845
Author(s):  
Naoyuki Tsukamoto ◽  
Shunsuke Imato ◽  
Yoshihiro Baba ◽  
Masaru Ishii
Keyword(s):  
Current Distribution ◽  
Zno Varistor ◽  
Lightning Impulse ◽  
Impulse Current
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