Attenuation and deformation characteristics of lightning impulse corona traveling along bundled transmission lines

He, Jinliang; Zhang, Xiao; Yang, Pengfei; Chen, Shuiming; Zeng, Rong

doi:10.1016/j.epsr.2014.07.020

Cited by 14 publications

(4 citation statements)

References 18 publications

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“…The computed values are listed in Table I. In terms of (5), the values of the corona inception field strength are evaluated for the single conductor and conductor bundles by the product of the measured corona inception voltage U in and the corresponding λ g (ρ), as shown in Table II. The values of the field strength on the conductor surface (at ρ = r 0 ) are also given in Table II for comparison.…”

Section: Corona Inception Condition As Can Be Seen Frommentioning

confidence: 99%

“…In the lightning transient analysis of the overhead lines, the charge–voltage ( q ‐ u ) curves are usually used to take account of the corona effect on the lightning overvoltages. Much measured data were reported for the q ‐ u curves; however, they were obtained only under double exponential impulses . In fact, most of lightning intruding surges into substations consider the damped oscillation waveshapes rather than the double exponential ones due to refraction and reflection of the surge waves .…”

Section: Introductionmentioning

confidence: 99%

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Measurement of corona characteristics of conductor bundles under negative damped oscillation impulses

Zhang

2019

IEEJ Transactions Elec Engng

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The corona characteristics of the single and bundle conductors are investigated experimentally under negative damped oscillation impulses. The experimental setup consisting of a modified impulse generator, corona cage and digital measurement system is built for measuring the charge–voltage (q‐u) curves. An exploratory experiment is described with special attention to the effect of the number of bundle conductors on the feature of q‐u curves. The behavior of the minor loops on the q‐u curves is examined from a single‐conductor to four‐conductor bundle. In terms of the measured corona inception voltage, the corona inception field strength is evaluated at a critical distance from the inner electrode. The capacitance increase coefficient and energy dissipated by corona are extracted from the measured q‐u curves. Then, a discussion is also presented on these characteristic indices according to the gas discharge mechanism. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Corona Inception Condition As Can Be Seen Frommentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of corona characteristics of conductor bundles under negative damped oscillation impulses

Zhang

2019

IEEJ Transactions Elec Engng

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“…Nevertheless, the measured data were obtained mainly under double exponential surges. The distortion and attenuation were always calculated according to the q-u curves under double exponential surges, no matter what the actual surge waveshapes are [3,[11][12][13]. As a matter of fact, the great majority of lightning surges intruding into substations are damped oscillation surges due to the refraction and reflection of surge waves [14,15].…”

Section: Introductionmentioning

confidence: 99%

Lightning Surge Analysis for Overhead Lines Considering Corona Effect

Zhang

Huang

2021

Applied Sciences

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Corona discharge characteristics are measured in a corona cage. The difference is found between the q–u curves under double exponential and damped oscillation surges. The behavior of the minor loops is revealed for the q–u curves under positive and negative damped oscillation surges. An extended improvement is made on the traditional approach for modeling of the q–u curves under damped oscillation surges. The extended approach has the capability of describing the complicated trajectory feature of the minor loops. On the basis of the extended approach, an efficient method is proposed for performing lightning surge analysis of overhead lines considering the corona effect. In the proposed method, an overhead line with corona is divided into a certain number of line segments. Each segment is converted into a circuit unit consisting of a non-linear branch and a linear circuit. With these circuit units connected in sequence, a complete equivalent circuit is constructed for the overhead line with corona. The transient responses can be obtained from the solution to the equivalent circuit. Then, the calculated results are compared with the field test results on a test overhead line.

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“…It is called statistical time lag, t g [129]. The statistical time lag for the corona onset in lightning case ranges from 0.4 µs to 0.8 µs [130]. Assuming t g is 0.4 µs and the lightning striking moment in the PSCAD set ting starts at 20 µs, the C for the cable downlead with and without the t g is shown in Fig.…”

Section: Impulse Corona Effect On Downlead Surge Impedancementioning

confidence: 99%

Design of an Internal Down-Lead System for a 400 kV Composite Tower and Investigation of Lightning Performance

Yin¹

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The recent development of modern renewable energy and the growing electrical power system bring a huge demand for environmentally friendly transmission lines. Aiming to this goal, the 'Power Pylons of the Future (PoPyFu)' project designed an innovative composite material pylon with a 'Y' shape profile for 400 kV AC transmis sion lines. This pylon consists of lightweight composite materials and has a compact configuration. Compared with the conventional pylons made of steel, the composite pylon requires less rightofway, lower manufacturing cost, fewer maintenance efforts, and presents an attractive appearance. Meanwhile, this kind of pylon has been con firmed to possess a perfect lightning shielding performance due to its special structure. With these attractive advantages, this pylon is believed to be a promising candidate as a nextgeneration of transmission tower.However, the downlead configuration, which directly concerns the transmission pylon safe operation when lightning strikes the tower, has not been determined. In this project, a conductor going through the hollow crossarm and pylon body is proposed as the downlead system. In order to inhibit the partial discharge inside the pylon, the gap between the downlead and crossarm is filled with a suitable insulating material. Based on this downlead scheme, the Ph.D. research work mainly focuses on the op timization of the downlead system, insulation verification, and proposing empirical formulas to estimate the backflash critical current for this novel pylon. The primary research contents are summarized as follows:The lightning performance of the pylon with the conductor passing through the filled crossarm and pylon body as a downlead system has been studied. The elec tromagnetic transient (EMT) model is established in PSCAD/EMTDC to obtain the transient response to lightning surges. In the modeling of the equivalent circuit, the surge impedance of the inclined downlead circumscribed by composite materials is expressed in integral form and validated by the Finite Element Method (FEM). In addi tion, the mutual coupling effect between separated downleads and the parasitic capac itance is considered. The simulation results show that the lightning performance of the Yshaped pylon is worse than that of conventional steel Eagle and Donau towers at the same voltage level, and the downlead system is needed to be optimized to improve the composite pylon's lightning performance. Then, potential multifactors that may affect the lightning performance have been studied including the downlead configu PrefaceThis Ph.D. thesis summarizes the outcomes from the Ph.D. project entitled "Design of an Internal DownLead System for a 400 kV Composite Tower and Investigation of Lightning Performance", which is supported by

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Attenuation and deformation characteristics of lightning impulse corona traveling along bundled transmission lines

Cited by 14 publications

References 18 publications

Measurement of corona characteristics of conductor bundles under negative damped oscillation impulses

Measurement of corona characteristics of conductor bundles under negative damped oscillation impulses

Lightning Surge Analysis for Overhead Lines Considering Corona Effect

Design of an Internal Down-Lead System for a 400 kV Composite Tower and Investigation of Lightning Performance

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