DC discharge performance at the tip of an icicle

Sugawara, N.; Hokari, K.

doi:10.1109/ceidp.1989.69536

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…It was found that conductivity of non-bridge icicle tip is higher than other parts, which might induce partial arc during melting period [17]. According to the appearance of icicle morphology, Hokari proposed two t kinds of ice morphology, rod and pipe-like icicles, where pipe-like icicles are more vulnerable to flashover since lower residue ice resistance [18]. Chisholm studied the flashover mechanism using cone icicle model, which is closer to the field samples, and found that icicle temperature and applied water conductivity were the leading cause for the transition from air gap breakdown to surface flashover at reduced voltage level.…”

Section: Introductionmentioning

confidence: 99%

Effects of electric field distribution and water drop ejection on flashover of icicles in plane-to-plane gaps

Deng

Jia

Guan

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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Ice morphology was established from field failure observations on electrical insulators, considering partial and full bridging conditions. Small scale laboratory simulations showed an important effect of droplet ejection on the probability of flashover. During the experiments, factors including applied water conductivity, icicle length, combinations of air gap and icicle length and duration of melting period were investigated using typical in-service stress levels. According to the experimental results, applied water conductivity and icicle length affected the residual ice layer resistance. Flashover voltage decreased by 33% as the conductivity increased from 150 S/cm to 750 μS/cm and reduced by 10% as icicle length declined from 6 to 4 cm for constant 2-cm air gap. Fully bridged icicles required extra energy for ice melting, leading to higher flashover voltage compared to partially bridged icicles of the same morphology. A single 3-cm air gap had 14% higher flashover voltage than a pair of 1.5 cm air gaps.

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Section: Introductionmentioning

confidence: 99%

Effects of electric field distribution and water drop ejection on flashover of icicles in plane-to-plane gaps

Deng

Jia

Guan

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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“…Although studies of corona discharge have been widely carried out [79] [86][89] [98], very few studies on the corona discharges at icicle tips [45] [48] were focused on and the space charge produced by the corona discharge is often ignored in the studies on the discharge development processes and the simulation of electric field distribution around the ice-covered insulators [43] [53].…”

Section: Introductionmentioning

confidence: 99%

Study of electric discharge and space charge formation phenomena in the air gaps of an ice-covered insulator using an icicle/ice-covered plate electrode system =

Yu¹

2007

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Microdischarges between ice particles

Coquillat¹,

Chauzy²,

Médale³

1995

J. Geophys. Res.

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A laboratory experiment is performed in a cold chamber to produce microdischarges between frozen hydrometeors. A charged icicle is placed close to an uncharged one connected to a transient analyser. The electric current signature obtained during each event is then studied and characterized in function of both temperature and net charge. The existence of a transition temperature of about −15°C is detected, whereas net charge clearly governs the microdischarge characteristics. Furthermore, the radiated electric field is calculated and the spectral analysis, by means of fast Fourier transform, shows that this elementary phenomenon radiates within the VHF range. Comparisons are made with previous similar work by Chauzy and Kably (1989) on microdischarges between water drops.

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DC discharge performance at the tip of an icicle

Cited by 7 publications

References 4 publications

Effects of electric field distribution and water drop ejection on flashover of icicles in plane-to-plane gaps

Effects of electric field distribution and water drop ejection on flashover of icicles in plane-to-plane gaps

Study of electric discharge and space charge formation phenomena in the air gaps of an ice-covered insulator using an icicle/ice-covered plate electrode system =

Microdischarges between ice particles

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