A New Method on Calculation of Lightning Trip Rate of 35 kV or Under Overhead Distribution Lines in Ungrounded Neutral Point System

Muliang, Cai; Wang, Jian; Deng, Yansha; Wang, Huayun; Wei, Ziqiang

doi:10.1109/ichve.2018.8641975

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“…To date, there are two most commonly used empirical methods for the estimation of lightning performance. Lumped parameter method [135] and lattice diagram method based on distribution parameters of circuit [63,136]. Aiming at traditional steel frame towers, they tend to show a good prediction regarding the lightning response.…”

Section: Existing Empirical Formulasmentioning

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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Section: Existing Empirical Formulasmentioning

confidence: 99%

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

Yin¹

View full text Add to dashboard Cite

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A New Method on Calculation of Lightning Trip Rate of 35 kV or Under Overhead Distribution Lines in Ungrounded Neutral Point System

Cited by 1 publication

References 0 publications

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

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

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