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Horn Length Estimation for Decrease of Tripout Rates on 150 kV Transmission Lines in West Sumatra in Indonesia

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The authors have carried out investigation of lightning tripout of 150 kV transmission lines in West Sumatra in Indonesia. The results of the
investigation in this paper show a positive correlation between the number of lightning tripouts on a 150 kV transmission line and the tower-footing resistance, and also reveal that the main cause of the tripouts is back-flashover. Moreover, it turns out that the flashover at the lower arm increases in case of high tower-footing resistance. The result of the investigation is in good agreement with the results of a simulation by the IEEE FLASH program. As the result, it is recommended that the length of an arching horn, in the 150 kV line in West Sumatra, is 1.1 m. When the tower-footing resistance at all towers is arranged to be 10  and the horn length is arranged 1.1 m, the critical current becomes about 80 kA. The tripout rate is expected to be less than 15 tripout/ 100 km/ year.

Keywords : Lightning tripouts, tower-footing resistance, transmission line, IKL

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: ., 2016

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English

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NONE

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text

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computer

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