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Improvement of ground impedance measurment using single rod method

In city centers, measurement of ground impedance is found to be crucial to prevent any hazard to the city citizens and equipment due to lightning and short circuits. Although various methods introduced to measure ground impedance but they mostly require a large site area or adoptable only for low fr...

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Main Author: Barahouei, Mohammad Reza
Format: Thesis
Language:English
Published: 2016
Subjects:
TK Electrical engineering. Electronics Nuclear engineering
Online Access:http://eprints.utm.my/id/eprint/77726/1/MohammadRezaBarahoueiMFKE2016.pdf
http://eprints.utm.my/id/eprint/77726/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:94231
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spelling my.utm.777262018-06-29T21:45:12Z http://eprints.utm.my/id/eprint/77726/ Improvement of ground impedance measurment using single rod method Barahouei, Mohammad Reza TK Electrical engineering. Electronics Nuclear engineering In city centers, measurement of ground impedance is found to be crucial to prevent any hazard to the city citizens and equipment due to lightning and short circuits. Although various methods introduced to measure ground impedance but they mostly require a large site area or adoptable only for low frequencies. Therefore, a new approach is needed to accurately measure the ground impedance value. In this study, an innovative method is developed based on one-rod measurement technique to overcome the limitation of site area measurement as well as to consider the frequency influence on ground electrode. In this method, a 5V-AC is injected by a signal generator with a variable frequency (from 5 Hz to 300 kHz) into the driven rod. The measured current is recorded accordingly. The ground resistance is then determined as the ratio of voltage and current. The corresponding resistivity is obtained based on Dwight formula. For the validation of the method in low frequency range, the obtained ground resistance from one-rod method was compared to that value obtained from fall-of-potential (FOP) method. In addition, for the validation of the method in high frequency range, the obtained ground resistances from one-rod method were compared to those values obtained from Visacro-Alipio theoretical model. The results show that the resistivity value obtained from the developed method and FOP were 113.28 Ω.m and 117.36Ω.m, respectively, which shows 3.5% difference. In addition, the resistivity value obtained from the developed method and Visacro-Alipio for the frequency range of 100 Hz to 300 kHz showed a minimum difference of 1.33% only. The simulation results of Single Rod method using CDEGS and EMTP showed the maximum of 1.09 % and 0.08% difference between simulation and experimental results respectively. These results validated the reliability of using one-rod method as an alternative method for measuring ground resistance especially in the congested area. 2016-06 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/77726/1/MohammadRezaBarahoueiMFKE2016.pdf Barahouei, Mohammad Reza (2016) Improvement of ground impedance measurment using single rod method. Masters thesis, Universiti Teknologi Malaysia, Faculty of Electrical Engineering. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:94231
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TK Electrical engineering. Electronics Nuclear engineering
spellingShingle TK Electrical engineering. Electronics Nuclear engineering
Barahouei, Mohammad Reza
Improvement of ground impedance measurment using single rod method
description In city centers, measurement of ground impedance is found to be crucial to prevent any hazard to the city citizens and equipment due to lightning and short circuits. Although various methods introduced to measure ground impedance but they mostly require a large site area or adoptable only for low frequencies. Therefore, a new approach is needed to accurately measure the ground impedance value. In this study, an innovative method is developed based on one-rod measurement technique to overcome the limitation of site area measurement as well as to consider the frequency influence on ground electrode. In this method, a 5V-AC is injected by a signal generator with a variable frequency (from 5 Hz to 300 kHz) into the driven rod. The measured current is recorded accordingly. The ground resistance is then determined as the ratio of voltage and current. The corresponding resistivity is obtained based on Dwight formula. For the validation of the method in low frequency range, the obtained ground resistance from one-rod method was compared to that value obtained from fall-of-potential (FOP) method. In addition, for the validation of the method in high frequency range, the obtained ground resistances from one-rod method were compared to those values obtained from Visacro-Alipio theoretical model. The results show that the resistivity value obtained from the developed method and FOP were 113.28 Ω.m and 117.36Ω.m, respectively, which shows 3.5% difference. In addition, the resistivity value obtained from the developed method and Visacro-Alipio for the frequency range of 100 Hz to 300 kHz showed a minimum difference of 1.33% only. The simulation results of Single Rod method using CDEGS and EMTP showed the maximum of 1.09 % and 0.08% difference between simulation and experimental results respectively. These results validated the reliability of using one-rod method as an alternative method for measuring ground resistance especially in the congested area.
format Thesis
author Barahouei, Mohammad Reza
author_facet Barahouei, Mohammad Reza
author_sort Barahouei, Mohammad Reza
title Improvement of ground impedance measurment using single rod method
title_short Improvement of ground impedance measurment using single rod method
title_full Improvement of ground impedance measurment using single rod method
title_fullStr Improvement of ground impedance measurment using single rod method
title_full_unstemmed Improvement of ground impedance measurment using single rod method
title_sort improvement of ground impedance measurment using single rod method
publishDate 2016
url http://eprints.utm.my/id/eprint/77726/1/MohammadRezaBarahoueiMFKE2016.pdf
http://eprints.utm.my/id/eprint/77726/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:94231
_version_ 1643657616021258240
score 13.211869

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