Computation of Lightning Transients in Large Scale Multiconductor Systems

Zhang, Xiaoqing

doi:10.1109/access.2018.2883385

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…Most tropical countries, several southern states of the United States, several regions of Japan, China and Australia, experience heavy annual lightning occurrence density [3], [4]. With the continuous improvement of lightning protection technology, engineers and researchers had conducted in-depth research on the transient characteristic of lightning strike [5], [6]. According to the operation experiences, reliable grounding was one of the keys to lightning protection of the overhead transmission line.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the Flexible Graphite Grounding Material and its Engineering Application

et al. 2019

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In order to meet the requirements of corrosion resistance of the grounding material and thermal stability of the grounding material of the transmission line towers, under the condition of power frequency current and high-frequency lightning current scattering into the ground in the case of short-circuit fault and lightning strikes, a kind of high-current capability flexible graphite grounding material was developed. The corrosion resistance of the flexible graphite grounding material and the steel type grounding material was compared by the soil simulation solution corrosion tests. The contact performance with different soils of the two materials was analyzed by the actual contact resistance measurement test. The thermal stability and the impulse current effective length of this grounding material were studied by means of simulation calculation. The results show that the high-current capability flexible graphite grounding material has a strong anticorrosion characteristic, whose reliable service life can exceed 30 years. Compared to the round steel grounding material, the contact resistance with the soil can be reduced by approximately 30%, and the impulse current effective length can be increased by about 30%. INDEX TERMS Flexible graphite grounding material, corrosion resistant characteristic, contact resistance, thermal stability, impulse current effective length.

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Section: Introductionmentioning

confidence: 99%

Characteristics of the Flexible Graphite Grounding Material and its Engineering Application

et al. 2019

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Simulation Study on Lightning Impulse Characteristics of Flexible Graphite Composite Grounding Materials Applied to Grounding Grid of Power System

Huang

et al. 2022

Front. Energy Res.

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The flexible graphite composite grounding electrode is a non-metallic grounding electrode with good electrical conductivity, corrosion resistance and non-ferromagnetic properties. In order to analyze the impulse characteristics of the graphite composite grounding electrode, this paper builds a frequency domain electrical network model and an equivalent radius iterative algorithm, considering skin effect, inductance effect, capacitance effect and spark discharge effect. The impulse characteristics of typical metal grounding electrodes and graphite composite grounding electrodes are analyzed by simulation. The research results show that: Compared with the traditional metal grounding electrode, the graphite composite grounding electrode has a smaller skin and inductance effect under the action of the impulse current, and a better current flowing capability; as the soil resistivity increases, the inductance effect and the skin effect are weakened, while the spark discharge effect is gradually enhanced and dominates. The spark discharge effect can effectively decrease the grounding resistance. The obtained critical value of the normalized parameter of 412 kA Ω, can be taken as the threshold to discriminate the conditions with dominate inductance effect from the conditions with dominant spark discharge effect.

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Computation of Lightning Transients in Large Scale Multiconductor Systems

Cited by 2 publications

References 24 publications

Characteristics of the Flexible Graphite Grounding Material and its Engineering Application

Characteristics of the Flexible Graphite Grounding Material and its Engineering Application

Simulation Study on Lightning Impulse Characteristics of Flexible Graphite Composite Grounding Materials Applied to Grounding Grid of Power System

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