Negative corona discharge at a tip of water cone deformed under dc field

Sugimoto, Toshiyuki; Asano, K.; Higashiyama, Yoshio

doi:10.1016/s0304-3886(01)00030-4

Cited by 38 publications

(24 citation statements)

References 31 publications

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“…According to this model, the discharge current pulse can occur not only from metal electrodes but also from water and ice surfaces. The related experiment results have also been verified by Toshiyuki Sugimoto et al [125] at water electrodes and H.W. Bandel [45] at water and ice points.…”

Section: Discussion On the Discharge Pulse Sequence Under Different Vsupporting

confidence: 66%

“…al. [125], who found that the magnitude of the initial and the final pulses in the first pulse series of each group increases linearly with the conductivity of water. In addition, compared with the influence of temperature, the variation of conductivity does not affect the discharge pulse magnitude as evidently as the temperature does.…”

Section: Environment Temperaturementioning

confidence: 98%

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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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Section: Discussion On the Discharge Pulse Sequence Under Different Vsupporting

confidence: 66%

Section: Environment Temperaturementioning

confidence: 98%

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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“…The field strengths occurring in service typically are much higher than the onset fields for direct current [15]. The corona discharges are related in [15] to the so-called Taylor instabilities, which occur at the final stage of a gradually increased voltage.…”

Section: E C For the Fraction Of Bigger Dropsmentioning

confidence: 99%

Simulation of the space charge near coronating conductors of ac overhead transmission lines

Straumann¹

2011

J. Phys. D: Appl. Phys.

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In the case of ac high voltage overhead transmission lines, corona discharges may result in a broadband crackling and a humming noise at twice the mains frequency (2f). The computation of the emitted 2f-levels presupposes the knowledge of the apparent power and force passed by the ions to the gas in the surroundings of the conductors. In this paper a simulation determining these magnitudes used in a previous publication is presented. For that purpose the ideas of earlier publications by other authors to compute corona losses are followed. Their central idea is to define an onset field strength on the surface of the conductor which is not exceeded by injecting the right amount of charges in the vicinity of the conductor. This injection together with the recombination determines the amount of drifting ions. The novelty of the method applied in this work is the consideration of different onset field strengths over the conductor surface in dependence of the polar angle. Further 2f-force and 2f-power acting on the gas in the vicinity of the conductor are determined out of the resulting ion drift. The corona currents thus computed coincide fairly well with measured results.

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“…The deformed water droplet usually involves with corona discharge. It has been well known that corona discharge from the tip of a water droplet manifests unique characteristics [2][3][4]. A droplet located on the surface of a hydrophobic sheet such as silicone rubber or PTFE under dc electric field also elongates along the direction of the electric field and forms a filamentary water channel in case of a strong field.…”

mentioning

confidence: 99%

Relation between Extension of a Filamentary Channel from a Water Droplet Placed on a Hydrophobic Sheet under AC Field and Flashover via the Droplet

Higashiyama

Kosano

2007

2007 IEEE Industry Applications Annual Meeting

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Flashover phenomena via a single water droplet located on a hydrophobic surface under an ac field was investigated. A water droplet under an ac field vibrates strongly only at the particular frequency range, which corresponds to resonant vibration with natural frequency of the droplet. The effect of deformation of the droplet by resonant vibration on flashover was investigated. Flashover voltage via a de-ionized water droplet with a volume ranging from 20 to 50 μl placed between the parallel rod electrodes was measured. The flashover voltage drastically decreased at the definite frequency smaller than the resonant frequency, regardless of droplet size. To make clear the mechanism of the decrease of flashover voltage at a particular frequency, the time variations of the shape of the water droplet for various frequencies were observed with a highspeed camera. Deformation of the droplet and formation of a water channel for non-resonant frequency would be effective to a flashover event. Ejection of several fine water droplets as well as electrification of the surface by corona discharge would also affect the extension of a water channel.

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Negative corona discharge at a tip of water cone deformed under dc field

Cited by 38 publications

References 31 publications

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 =

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 =

Simulation of the space charge near coronating conductors of ac overhead transmission lines

Relation between Extension of a Filamentary Channel from a Water Droplet Placed on a Hydrophobic Sheet under AC Field and Flashover via the Droplet

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