Study of Flashover Model on Overhead Distribution Lines

Asano, Kentaro; Miyazato, Kenji; Hara, Kazuhiko; Shimomura, Tetsuro; Horinouchi, Yusaku

doi:10.1541/ieejpes.123.1373

Cited by 5 publications

(3 citation statements)

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“…In addition, there have been many investigations of lighting protection of distribution lines [13][14][15][16][17][18], but few dealing with creeping discharges on conductor surfaces. Lightning often occurs during rain, so that water drops adhere to the wire surface and create wet conditions.…”

Section: Introductionmentioning

confidence: 99%

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Negative Creeping Discharge along Aerial Insulated Wire in Wet Condition

Nishi

Hanaoka

Murdiya

et al. 2015

Electrical Engineering Japan

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Aerial insulated wires are supported by postinsulators and binding wires on reinforced concrete poles. When a lightning flash strikes near by the wires, an overvoltage due to the indirect lightning surge is induced in the conductive wire core. A creeping discharge can develop along the wire surface from the free end of the binding wire through the postinsulator and reinforced concrete pole if flashover occurs at the postinsulator, and this also leads to wire damage such as melting or snapping. This can occur under either rainy or thunderstorm conditions. In this case, it indicates that the wire surface is stressed by lightning impulses under wet condition. Consequently, it is important to prevent wire damage and to clarify the characteristics of creeping discharges along the wire surface under dry and wet conditions. In previous investigations, we observed the characteristics of creeping discharges along wire surfaces under dry conditions. In this investigation, we examined creeping discharges under both impulse voltages with various wave front durations and wet conditions on the wire surface. These voltages were applied to the conductive wire core as inductive lightning surges. The duration and phenomena of negative creeping discharges developing along the wire surface were measured using a still camera with an image intensifier. We report the characteristics of the development of negative creeping discharges along wire surfaces under wet condition. C⃝ 2015 Wiley Periodicals, Inc. Electr Eng Jpn, 194(4): 1-9, 2016; Published online in Wiley Online Library (wileyonlinelibrary.com).

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Section: Introductionmentioning

confidence: 99%

“…Thus, creeping discharge properties under wet conditions remain unclear not only for cylindrical dielectrics such as wires, but also for flat surfaces. In addition, there have been many investigations of lighting protection of distribution lines [13][14][15][16][17][18], but few dealing with creeping discharges on conductor surfaces.…”

Section: Introductionmentioning

confidence: 99%

Negative Creeping Discharge along Aerial Insulated Wire in Wet Condition

Nishi

Hanaoka

Murdiya

et al. 2015

Electrical Engineering Japan

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“…There are only a few reports on the creeping discharge for the lightning surge with various T f , because actual inductive lightning surges usually are simulated by a standard lightning impulse voltage (1.2/50 μs). While a lot of studies of the distribution line due to the direct or inductive lightning stroke have been performed on the protection of lightning damages , studies on the creeping discharges at the cable surface caused by the lightning strike are very few, particularly, the effect of T f on the creeping discharge has not been clarified for the present.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Creeping Discharge along Aerial Insulated Cable and Duration of Wave Front of Inductive Lightning Surge

Nishi

Hanaoka

Takata

2014

Electrical Engineering Japan

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SUMMARY We report the results obtained on the developing characteristics of creeping discharges along the insulated cable surface under inductive lightning surge voltages with various durations of wave front. The aerial insulated cables, usually, are supported by the post insulator and the binding wire at the reinforced concrete pole. When a lightning strikes near by the aerial insulated cables, the overvoltage due to the inductive lightning surge invades to the central line of the cable. The creeping discharge can develop along the cable surface from the free end of the binding wire just after a flashover of the post insulator at the cable supporting point. This creeping discharge may give rise to the accidents such as a melting or snapping of the cable. An important subject to prevent these accidents is to clarify the characteristics of creeping discharge along the cable surface and the developing mechanism of discharges. In this study, the impulse voltages with various durations of wave front are applied to the central line of the wire as the inductive lightning surge. The length and aspect of positive and negative creeping discharges developing along the cable surface are measured using a still camera with an image intensifier, and the developing mechanisms of creeping discharges are discussed on the basis of the models which are proposed taking into account the obtained results.

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