Investigation of the directional dependence of soil resistivity in cracking clays

2014 ◽  
pp. 137-142 ◽  
Author(s):  
A Hassan ◽  
D Toll
Keyword(s):  
Soil Resistivity ◽  
Directional Dependence ◽  
Cracking Clays

scholarly journals Effect of Earthing Enhancing Compound (EEC) on Improving Tower Footing Resistance of a 500 kV Tower in a Rocky Area

2021 ◽  
Vol 11 (12) ◽  
pp. 5623
Author(s):  
Nur Alia Farina Mohd Nasir ◽  
Mohd Zainal Abidin Ab Kadir ◽  
Miszaina Osman ◽  
Muhamad Safwan Abd Rahman ◽  
Ungku Anisa Ungku Amirulddin ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Comparative Analysis ◽  
Transmission Line ◽  
Structure Analysis ◽  
Current Distribution ◽  
Soil Profile ◽  
Soil Structure ◽  
Soil Resistivity ◽  
Transmission Towers ◽  
Rocky Soil

This paper presents a comparative analysis of different earthing designs’ performances, with particular interest on the use of earthing enhancing compound (EEC) for a selected earthing design of 500 kV transmission towers in a rocky soil, using the SESCAD tool of the Current distribution, electromagnetic field grounding and soil structure analysis (CDEGS) software. The simulation included the interpretation of soil profile and comparison between designs A, B and C, which are currently used for the 500 kV tower footing resistance (TFR) improvement. Results showed each design had reduced the TFR by 66%, 54.7% and 63.2% for the towers T42, T48 and T50, respectively. In some cases, further improvement of TFR is required, especially in the rocky area where the soil resistivity (SR) value is of more than 500 Ω⋅m. In this case, EEC was used in Design C, encasing both the vertical and horizontal electrodes, and it reduced the TFR further by 16% to 20%. The characteristics of the soil and earthing arrangement design play an important role in achieving a low TFR value, which is directly proportional to the backflashover occurrence and thus to the transmission line performance.

Preparation and Long-Term Stability Study of Steel Fiber/Graphite Conductive Concrete

2016 ◽  
Vol 680 ◽  
pp. 361-364 ◽  
Author(s):  
Jun Du ◽  
Cheng Tang ◽  
Bo Jia ◽  
De Zhang ◽  
Qiang Miao
Keyword(s):  
Corrosion Resistance ◽  
Steel Fiber ◽  
Stability Study ◽  
Soil Resistivity ◽  
Grounding Resistance ◽  
Term Stability ◽  
Long Term Stability ◽  
Conductive Fillers ◽  
The Common

The steel fiber/graphite conductive concrete is applied in power system grounding. In high soil resistivity regions, the common methods for reducing the grounding resistance are not practical. It is difficult for grounding resistance of substations to meet the requirements of working earthing and safety earthing. In order to solve this problem, a steel fiber/graphite conductive concrete is developed in this paper. Steel fiber and graphite are added as conductive fillers. The long-term stability of the steel fiber/graphite conductive concrete is studied. The experiment results show that steel fiber/graphite conductive concrete not only maintains excellent conductivity, but also has good mechanical strength and corrosion resistance in 300 days.

scholarly journals DIRECTIONAL DEPENDENCE OF ΛCDM COSMOLOGICAL PARAMETERS

2013 ◽  
Vol 773 (1) ◽  
pp. L3 ◽  
Author(s):  
M. Axelsson ◽  
Y. Fantaye ◽  
F. K. Hansen ◽  
A. J. Banday ◽  
H. K. Eriksen ◽  
...  
Keyword(s):  
Cosmological Parameters ◽  
Directional Dependence

The influence of seasonal soil moisture on the behavior of soil resistivity and power distribution grounding systems

2015 ◽  
Vol 118 ◽  
pp. 76-82 ◽  
Author(s):  
Vilson Luiz Coelho ◽  
Alexandre Piantini ◽  
Hugo A.D. Almaguer ◽  
Rafael A. Coelho ◽  
Wallace do C. Boaventura ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Power Distribution ◽  
Soil Resistivity

Directional Dependence of Co-60 Irradiation on the Total Dose Response of Flash Memories

2019 ◽  
Vol 66 (1) ◽  
pp. 148-154
Author(s):  
Matthew J. Gadlage ◽  
David I. Bruce ◽  
James D. Ingalls ◽  
Dobrin P. Bossev ◽  
Matthew Mckinney ◽  
...  
Keyword(s):  
Total Dose ◽  
Dose Response ◽  
Flash Memories ◽  
Directional Dependence

scholarly journals Directional dependence of the pion source in high-energy heavy-ion collisions

1995 ◽  
Vol 349 (3) ◽  
pp. 386-392 ◽  
Author(s):  
H. Bøggild ◽  
J. Boissevain ◽  
M. Cherney ◽  
J. Dodd ◽  
S. Esumi ◽  
...  
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
High Energy ◽  
Directional Dependence ◽  
Ion Collisions
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