Lightning Impulse Performances of Grounding Grids for Substations Considering Soil Ionization

When lightning strikes a substation or a transmission tower near the substation, high current generated by the stroke would flow into the grounding grid of the substation and dissipate in the soil. The transient characteristic of the grounding grid is very important to the safe and reliable operatio...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2008-04, Vol.23 (2), p.667-675
Main Authors: Rong Zeng, Rong Zeng, Xuehai Gong, Xuehai Gong, Jinliang He, Jinliang He, Bo Zhang, Bo Zhang, Yanqing Gao, Yanqing Gao
Format: Article
Language:English
Subjects:
Applied sciences
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Grounding
Grounding grid
Impulses
Ionization
Lightning
lightning impulse
Lightning strikes
Mathematical models
Miscellaneous
Overhead networks
Poles and towers
Power networks and lines
Power system modeling
Power system reliability
Power system simulation
Power system transients
Soil
Soil (material)
soil ionization
Substations
transient characteristic
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Summary:When lightning strikes a substation or a transmission tower near the substation, high current generated by the stroke would flow into the grounding grid of the substation and dissipate in the soil. The transient characteristic of the grounding grid is very important to the safe and reliable operation of the power system. A circuit model with a lumped time-variable parameter is proposed to calculate the transient characteristics of a grounding grid under lightning current. The ionization phenomena around the ground conductors in the soil are simulated by means of time-variable parameters under appropriate conditions. The influences of different parameters on the transient characteristics of the grounding grid subjected to lightning impulse current are analyzed and the effective usage area of the grounding grid under lightning is discussed.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2007.915194