The Effect of a Large Backfill Area on Grounding Grid Performance

The construction of a substation will undoubtedly change the properties of any surrounding native soil. In order to study the influence of backfill material on grounding grid performance and in turn optimize that performance, current distribution, electromagnetic fields, ground, and soil structure a...

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Main Authors: Yaguang Tao, Jianchun Wei, Qingquan Li, Yalin Shi, Tongqiao Zhang, Jiwei Zhang, Xiao Liu
Format: Article
Language:English
Published: MDPI AG 2018-03-01
Series:Energies
Subjects:
Online Access:http://www.mdpi.com/1996-1073/11/4/698
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author Yaguang Tao
Jianchun Wei
Qingquan Li
Yalin Shi
Tongqiao Zhang
Jiwei Zhang
Xiao Liu
author_facet Yaguang Tao
Jianchun Wei
Qingquan Li
Yalin Shi
Tongqiao Zhang
Jiwei Zhang
Xiao Liu
author_sort Yaguang Tao
collection DOAJ
description The construction of a substation will undoubtedly change the properties of any surrounding native soil. In order to study the influence of backfill material on grounding grid performance and in turn optimize that performance, current distribution, electromagnetic fields, ground, and soil structure analysis (CDEGS) was undertaken to simulate the secondary peak of the step voltage generated by a large backfill soil area. As for the various parameters of the finite soil volume, the influence of the soil length L, the edge gradient tan θ, and the resistivity ρ on the secondary peak of step voltage was researched. Then, a grounding test system was established, the selection process of the protection resistors was clarified, and the usage method of agar gel was improved. The feasibility of simulating backfill material with agar gel was verified, and the influence of resistivity and soil scale on the secondary peak of the step voltage was tested. The results show that the larger the backfill material length is, the larger the resistivity is, and the lower the peak voltage is. The effect of soil resistivity on the secondary peak will be greater when the range of backfill material is larger, which means that reducing soil resistivity can effectively reduce the secondary peak. Therefore, a smaller slope can be formed at the edge of the earthwork in the actual substation to reduce the project amount and save investment, which has a certain degree of engineering significance.
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spelling doaj.art-77ec550a00904e4dbdb685b81bd89cfb2022-12-22T01:58:25ZengMDPI AGEnergies1996-10732018-03-0111469810.3390/en11040698en11040698The Effect of a Large Backfill Area on Grounding Grid PerformanceYaguang Tao0Jianchun Wei1Qingquan Li2Yalin Shi3Tongqiao Zhang4Jiwei Zhang5Xiao Liu6Department of Electrical Engineering, Shandong University, Jinan 250061, ChinaDepartment of Electrical Engineering, Shandong University, Jinan 250061, ChinaDepartment of Electrical Engineering, Shandong University, Jinan 250061, ChinaJinan Power Supply Company of State Grid Shandong Electric Power Company, Jinan 250012, ChinaJinan Power Supply Company of State Grid Shandong Electric Power Company, Jinan 250012, ChinaJinan Power Supply Company of State Grid Shandong Electric Power Company, Jinan 250012, ChinaJinan Power Supply Company of State Grid Shandong Electric Power Company, Jinan 250012, ChinaThe construction of a substation will undoubtedly change the properties of any surrounding native soil. In order to study the influence of backfill material on grounding grid performance and in turn optimize that performance, current distribution, electromagnetic fields, ground, and soil structure analysis (CDEGS) was undertaken to simulate the secondary peak of the step voltage generated by a large backfill soil area. As for the various parameters of the finite soil volume, the influence of the soil length L, the edge gradient tan θ, and the resistivity ρ on the secondary peak of step voltage was researched. Then, a grounding test system was established, the selection process of the protection resistors was clarified, and the usage method of agar gel was improved. The feasibility of simulating backfill material with agar gel was verified, and the influence of resistivity and soil scale on the secondary peak of the step voltage was tested. The results show that the larger the backfill material length is, the larger the resistivity is, and the lower the peak voltage is. The effect of soil resistivity on the secondary peak will be greater when the range of backfill material is larger, which means that reducing soil resistivity can effectively reduce the secondary peak. Therefore, a smaller slope can be formed at the edge of the earthwork in the actual substation to reduce the project amount and save investment, which has a certain degree of engineering significance.http://www.mdpi.com/1996-1073/11/4/698backfill materialsecondary peak of step voltageCDEGS (current distribution, electromagnetic fields, ground, and soil structure analysis)ground simulation testagar gel
spellingShingle Yaguang Tao
Jianchun Wei
Qingquan Li
Yalin Shi
Tongqiao Zhang
Jiwei Zhang
Xiao Liu
The Effect of a Large Backfill Area on Grounding Grid Performance
Energies
backfill material
secondary peak of step voltage
CDEGS (current distribution, electromagnetic fields, ground, and soil structure analysis)
ground simulation test
agar gel
title The Effect of a Large Backfill Area on Grounding Grid Performance
title_full The Effect of a Large Backfill Area on Grounding Grid Performance
title_fullStr The Effect of a Large Backfill Area on Grounding Grid Performance
title_full_unstemmed The Effect of a Large Backfill Area on Grounding Grid Performance
title_short The Effect of a Large Backfill Area on Grounding Grid Performance
title_sort effect of a large backfill area on grounding grid performance
topic backfill material
secondary peak of step voltage
CDEGS (current distribution, electromagnetic fields, ground, and soil structure analysis)
ground simulation test
agar gel
url http://www.mdpi.com/1996-1073/11/4/698
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