Streamer propagation under impulse voltage in long point-plane oil gaps

Linhjell, D.; Lundgaard, L.E.; Berg, Gunnar

doi:10.1109/94.300288

Cited by 81 publications

(71 citation statements)

References 15 publications

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“…The light intensities from the tip and from the filament have also been reported to be of similar strengths [3,29] which may indicate a similar conductivity and charge density. This reasoning and questions about differences in temperature, see section 5.3, for example, might be investigated by means of the method described in this paper.…”

Section: The Streamer Tipmentioning

confidence: 81%

Spectroscopic measurements of streamer filaments in electric breakdown in a dielectric liquid

Barmann¹,

Kröll²,

Sunesson

1996

J. Phys. D: Appl. Phys.

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Abstract. Emission spectroscopy has been utilized to provide information about the electron density and temperature in streamers and breakdown arcs in transformer oil. Recorded spectra include strongly broadened hydrogen Balmer-α lines and vibration/rotation band profiles of the C 2 molecule. The origin of the observed broadening of hydrogen lines is discussed and it is concluded that it arises mainly from collisions with charged particles, so-called dynamic Stark broadening. By assuming that the broadening is due solely to dynamic Stark broadening, electron densities between 1 × 10 18 and 1 × 10 19 cm −3 were obtained for the rear of positive streamer filaments during the later stages of propagation. For negative streamers we obtained an upper limit of 3 × 10 16 cm −3 and for breakdown arcs electron densities up to 4 × 10 18 cm −3 . The temperature information in the C 2 emission profiles and the intensity ratio of the hydrogen Balmer lines are discussed. Rough estimations of the temperature are presented both for positive and for negative streamers.

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Section: The Streamer Tipmentioning

confidence: 81%

Spectroscopic measurements of streamer filaments in electric breakdown in a dielectric liquid

Barmann¹,

Kröll²,

Sunesson

1996

J. Phys. D: Appl. Phys.

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“…On the other hand, a number of studies on traditional mineral oil were published (Lesaint and Massala, 1998;Massala and Lesaint, 2001;Linhjell et al, 1994;Torshin, 2003Torshin, , 2009Lopatin et al, 1998) describing the streamer initiation and propagation in terms of velocity and shape, streamer mechanism and streamer modeling. It is acknowledged that impulse pre-breakdown and breakdown characteristics are related to chemical composition of the liquid, so application of esters (with composition different to mineral oil) calls for detailed investigation under impulse voltage.…”

Section: Electrical Characteristics Of Selected Oilsmentioning

confidence: 99%

Optical observation of streamer propagation and breakdown in seed based insulating oil under impulse voltages

2014

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Increasing demand of electricity and high consumption of natural fuel resources has raised countless challenges for the electricity industry. For years, transformers were equipped with mineral oil for better and lasting performance but the recent uncertainty about the future of oil availability is motivating the researchers to find out the "Green Insulating Oils" for transformers. Thus, green insulating oils are being probed with great interest at research centers worldwide. In this paper, Canola oil was studied for applications in transformers as a sustainable solution. It presents experimental results of a comparative study of initiation and propagation of streamers in canola seed based oil and mineral insulating oil when subjected under standard lightning impulse voltages. Moreover, streamer patterns, modes of propagation and their stopping lengths were investigated under both polarities of voltage in point-plane electrode gap. The paper concludes with six different findings, which states that canola oil is a better and sustainable choice of oil for transformer use.

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“…Previous work important for this topic includes experimental studies using imaging, broad-band light emission measurements and current measurements [1][2][3][4][5][6][7][8][9][10]. Therefore, a lot is today known about the streamer's appearance, streamer initiation and streamer propagation.…”

Section: Introductionmentioning

confidence: 99%

Spatially and temporally resolved electron density measurements in streamers in dielectric liquids

Barmann¹,

Kröll²,

Sunesson

1997

J. Phys. D: Appl. Phys.

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Abstract. Spatially and temporally resolved spectroscopic measurements of light emitted from positive streamers in transformer oil are presented. Analyses of the measurements performed with a DC needle-plane gap yield electron densities and indications of the atomic excitation temperatures in the streamers. The hydrogen emission reveals an electron density below 10 16 cm −3 during the main part of the streamer propagation time (80-90%). Later the light is also characterized by emission from a high-density plasma with electron densities in the range 10 18 -10 19 cm −3 . The electron density during this time increases approximately linearly with distance from the initiation point and a density factor of four higher has been measured at the streamer tip than at the root. Measurements with high spectral resolution detect both high and low electron densities simultaneously. A tentative model of the interior of the streamer plasma, spatially resolved, is presented.

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Streamer propagation under impulse voltage in long point-plane oil gaps

Cited by 81 publications

References 15 publications

Spectroscopic measurements of streamer filaments in electric breakdown in a dielectric liquid

Spectroscopic measurements of streamer filaments in electric breakdown in a dielectric liquid

Optical observation of streamer propagation and breakdown in seed based insulating oil under impulse voltages

Spatially and temporally resolved electron density measurements in streamers in dielectric liquids

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