Mathematical-physical model of the streamer in nonuniform fields

Nasser, Essam; Heiszler, Manfred

doi:10.1063/1.1663791

Cited by 58 publications

(12 citation statements)

References 7 publications

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“…According to the streamer theory [15,16], the streamer starts at a position near the electrode where the ionization coefficient is equal to the adhesion coefficient under a positive DC voltage. In the development of an electron avalanche moving to the positive electrode, the charge of the head of the electron avalanche increases.…”

Section: Discussionmentioning

confidence: 99%

Study on Impulse Breakdown Characteristics of Internal-Gap Lightning Protection Device Applied to 35 kV Distribution Line

Fang

Wang

et al. 2018

Energies

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External environmental factors have no effect on the breakdown performance of the internal gap, leading to the anti-icing and anti-storm features of the internal-gap lightning protection device (ILPD). In this paper, a test platform is created to study the impulse discharge and arc erosion characteristics of the ILPD applied to a 35 kV distribution line. The 50% lightning impulse voltage and discharge stability of the ILPD are experimentally analysed. The results show that the ILPD has good discharge voltage repeatability under multiple impulses. Under a positive lightning impulse, the 50% breakdown voltage of the ILPD is 3.8-11.4% higher than that of the outer-gap lightning protection device (OLPD). A finite element simulation model is created for electric field analysis. The maximum electric field strength of the ILPD is 4.68% lower than that of the OLPD, leading to a higher lightning breakdown voltage. High-speed camera shooting shows that the discharge arc may lead to the erosion of the discharge tube, reducing its insulation performance. A large current impulse test platform is set up for arc energy analysis, which indicates that more than 90% of the energy is absorbed by the varistor during lightning stroke. The quality and leakage current of the discharge tube did not change significantly after testing. Given the current design of varistors, the per unit length energy of arc is less than 4.5 J/mm due to the numerical calculation, which is far less than the experimental arc energy (25.0 J/mm). Therefore, arc erosion will not cause the insulation performance of discharge tube to decrease when using the current varistor design.

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Section: Discussionmentioning

confidence: 99%

Study on Impulse Breakdown Characteristics of Internal-Gap Lightning Protection Device Applied to 35 kV Distribution Line

Fang

Wang

et al. 2018

Energies

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“…21,22 An unified expression for evaluating the positive dc corona onset can be achieved by introducing a geometric factor. [23][24][25] The effective photon wavelength responsible for photoionization also can be considered based on the classic corona onset criterion.…”

Section: Introductionmentioning

confidence: 99%

Self-sustained criterion with photoionization for positive dc corona plasmas between coaxial cylinders

Zheng

Zhang

2015

Physics of Plasmas

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The positive dc corona plasmas between coaxial cylinders in air under the application of a self-sustained criterion with photoionization are investigated in this paper. A photon absorption function suitable for cylindrical electrode, which can characterize the total photons within the ionization region, is proposed on the basis of the classic corona onset criteria. Based on the general fluid model with the self-sustained criterion, the role of photoionization in the ionization region is clarified. It is found that the surface electric field keeps constant under a relatively low corona current, while it is slightly weakened with the increase of the corona current. Similar tendencies can be found under different conductor radii and relative air densities. The small change of the surface electric field will become more significant for the electron density distribution as well as the ionization activity under a high corona current, compared with the results under the assumption of a constant surface field. The assumption that the surface electric field remains constant should be corrected with the increase of the corona current when the energetic electrons with a distance from the conductor surface are concerned.

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“…Corona discharge phenomena have been investigated by many researchers for many years, and a large amount of useful data has been accumulated so far. In this paper, the experimental values of positive DC corona onset voltage of rod‐plane air gaps with different radiuses and gap lengths are extracted from [23–25], and used as samples for the prediction study by the proposed method. These experimental values were obtained by the corona tests conducted in the normal room air.…”

Section: Prediction Of Positive DC Corona Onset Voltage In Rod‐plane mentioning

confidence: 99%

Prediction study on positive DC corona onset voltage of rod‐plane air gaps and its application to the design of valve hall fittings

Qiu

Ruan

Huang

et al. 2016

IET Generation, Transmission & Distribution

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Mathematical-physical model of the streamer in nonuniform fields

Cited by 58 publications

References 7 publications

Study on Impulse Breakdown Characteristics of Internal-Gap Lightning Protection Device Applied to 35 kV Distribution Line

Study on Impulse Breakdown Characteristics of Internal-Gap Lightning Protection Device Applied to 35 kV Distribution Line

Self-sustained criterion with photoionization for positive dc corona plasmas between coaxial cylinders

Prediction study on positive DC corona onset voltage of rod‐plane air gaps and its application to the design of valve hall fittings

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