Experimental analysis on the change regulation of the soil resistivity considering the thermal effect around the grounding electrode

2011 ◽  
Author(s):  
Wenxia Sima ◽  
Ling Luo ◽  
Tao Yuan ◽  
Qing Yang ◽  
Yan Tang ◽  
...  
Keyword(s):  
Thermal Effect ◽  
Experimental Analysis ◽  
Soil Resistivity ◽  
Grounding Electrode

scholarly journals FEM Analysis and Sensor-Based Measurement Scheme of Current Distribution for Grounding Electrode

2020 ◽  
Vol 10 (22) ◽  
pp. 8151
Author(s):  
Li Zhu ◽  
Hui Jiang ◽  
Fan Yang ◽  
Hanwu Luo ◽  
Wenzhen Li ◽  
...  
Keyword(s):  
Current Distribution ◽  
Soil Analysis ◽  
Fem Analysis ◽  
Simulation Models ◽  
Current Data ◽  
Frozen Soil ◽  
Power Equipment ◽  
Soil Resistivity ◽  
Measurement Scheme ◽  
Grounding Electrode

The current distribution of the grounding electrode in a high-voltage direct current (HVDC) transmission system affects the state of power equipment in its vicinity, which depends on the soil resistivity and shape of the grounding electrode. In this paper, current distribution in the vicinity of an ±800 kV grounding electrode is investigated by simulation and experiments. Firstly, the model to calculate the current distribution with two typical frozen soils is set up, and simulation models and experimental platforms are established; meanwhile, the finite element method (FEM) is used to calculate the current and potential dispersion of linear, cross-shaped, and ring-shaped grounding electrodes in the simulation models. After obtaining the lab current data from the simulation, an innovative method based on a “drainage wire” with a Hall sensor is proposed to measure the current in an experimental setup. The results show that current and potential distribution characteristics are related to the shape of the grounding electrode and soil resistivity. Meanwhile, the current measurement scheme can measure the current in soil with a lower error. This article concludes that these two typical models can reduce the complexity of frozen soil analysis, and the measurement scheme can accurately monitor the current to reduce the damage to the surrounding power equipment.

scholarly journals Thermal effect of Er:YAG and Er,Cr:YSGG used for debonding ceramic and metal orthodontic brackets: An experimental analysis

2020 ◽  
Vol 29 (5) ◽  
pp. 557-563
Author(s):  
Patrycja Downarowicz ◽  
Paweł Noszczyk ◽  
Marcin Mikulewicz ◽  
Rafał Nowak
Keyword(s):  
Thermal Effect ◽  
Experimental Analysis ◽  
Orthodontic Brackets

Comparison of the antenna model and experimental analysis of an impulse impedance of the horizontal grounding electrode

2015 ◽  
Vol 125 ◽  
pp. 159-163 ◽  
Author(s):  
Silvestar Šesnić ◽  
Tonko Garma ◽  
Dragan Poljak ◽  
Sergey V. Tkachenko
Keyword(s):  
Experimental Analysis ◽  
Grounding Electrode ◽  
Antenna Model
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