Photoionization model for streamer propagation mode change in simulation model for streamers in dielectric liquids

被引：7

作者：

Madshaven I. ^{[1
]}

Hestad O.L. ^{[2
]}

Unge M. ^{[3
]}

Hjortstam O. ^{[3
]}

Åstrand P.O. ^{[1
]}

机构：

[1] Department of Chemistry, NTNU-Norwegian University of Science and Technology, Trondheim

[2] SINTEF Energy Research, Trondheim

[3] ABB Corporate Research, Västerås

来源：

Plasma Research Express | 2020年 / 2卷 / 01期

关键词：

Dielectric liquid; Photoionization; Prebreakdown; Simulation model; Streamer;

D O I：

10.1088/2516-1067/ab6320

中图分类号：

学科分类号：

摘要：

Radiation is important for the propagation of streamers in dielectric liquids. Photoionization is a possibility, but the effect is difficult to differentiate from other contributions. In this work, we model radiation from the streamer head, causing photoionization when absorbed in the liquid. We find that photoionization is local in space (μm-scale). The radiation absorption cross section is modeled considering that the ionization potential (IP) is dependent on the electric field. The result is a steep increase in the ionization rate when the electric field reduces the IP below the energy of the first electronically excited state, which is interpreted as a possible mechanism for changing from slow to fast streamers. By combining a simulation model for slow streamers based on the avalanche mechanism with a change to fast mode based on a photoionization threshold for the electric field, we demonstrate how the conductivity of the streamer channel can be important for switching between slow and fast streamer propagation modes. © 2020 The Author(s). Published by IOP Publishing Ltd

引用

共 43 条

[1]

Wedin P, Electrical breakdown in dielectric liquids-a short overview, IEEE Electr Insul Mag, 30, pp. 20-25, (2014)

[2]

Lesaint O, Prebreakdown phenomena in liquids: propagation 'modes' and basic physical properties, J Phys. D: Appl. Phys, 49, (2016)

[3]

Farazmand B, Study of electric breakdown of liquid dielectrics using Schlieren optical techniques, Br. J. Appl. Phys, 12, pp. 251-254, (1961)

[4]

Sakamoto S, Yamada H, Optical study of conduction and breakdown in dielectric liquids, IEEE Trans. Electr. Insul, 15, pp. 171-181, (1980)

[5]

Dung N V, Hoidalen H K, Linhjell D, Lundgaard L E, Unge M, Effects of reduced pressure and additives on streamers in white oil in long point-plane gap, J Phys. D: Appl. Phys, 46, (2013)

[6]

Linhjell D, Lundgaard L, Berg G, Streamer propagation under impulse voltage in long point-plane oil gaps, IEEE Trans. Dielectr. Electr. Insul, 1, pp. 447-458, (1994)

[7]

Lundgaard L, Linhjell D, Berg G, Sigmond S, Propagation of positive and negative streamers in oil with and without pressboard interfaces, IEEE Trans. Dielectr. Electr. Insul, 5, pp. 388-395, (1998)

[8]

Biller P, A simple qualitative model for the different types of streamers in dielectric liquids ICDL'96, 12th Int. Conf. Conduct Break Dielectr Liq, pp. 189-192, (1996)

[9]

Beroual A, Pre-breakdown mechanisms in dielectric liquids and predicting models 2016, IEEE Electr. Insul. Conf, pp. 117-128, (2016)

[10]

Niemeyer L, Pietronero L, Wiesmann H J, Fractal dimension of dielectric breakdown, Phys. Rev. Lett, 52, pp. 1033-1036, (1984)

← 1 2 3 4 5 →