Pre-Breakdown and Breakdown Phenomena in Liquid Nitrogen With a Tape–Plane Electrode Geometry

Chassagnoux, Raphaël; Lesaint, Olivier; Bonifaci, Nelly; Gallot‐Lavallée, Olivier; Creusot, Ch.; Girodet, A.

doi:10.1109/tdei.2023.3252481

Cited by 2 publications

(10 citation statements)

References 30 publications

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“…In negative polarity, streamers propagate with a bush-like structure and mean velocity vs ranging from 100 to 200 m/s. This shape and velocity are identical to those of streamers observed with non-heated tape [7], and point-plane gap [16,25,26]. Minimum voltages to observe streamer development (down to about 60 kV with Δt = 5 ms and d = 10 mm) are considerably reduced as compared to non-heated tape (about 110 kV [7]).…”

Section: Streamers In Liquidssupporting

confidence: 69%

“…The cryostat [16,17] and the tape-plane electrode setup, used in this experimental study, were presented in previous studies [7,14,15]. A schematic view of the electrode system is presented in Fig.…”

Section: A Experimental Setupmentioning

confidence: 99%

“…Since the STI impulse provides a better insight into pre-breakdown phenomena, it was preferred to SI at the expense of waveform shape representativity. Notice that a comparative study of STI, LI, and SI waveforms was carried out with non-heated tape in [7]. In the following text, the quoted polarity of pre-breakdown phenomena is the tape polarity, since discharges always start from this tape electrode.…”

Section: A Experimental Setupmentioning

confidence: 99%

“…Additional diagnostic methods such as in [7] were used: fast video camera to record vapor bubble dynamics, gated image IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION intensifier and photomultiplier (PM) to record and visualize the light emitted by discharges within bubbles, or in LN2.…”

Section: A Experimental Setupmentioning

confidence: 99%

“…The study of dielectric breakdown in "normal" conditions (i.e. when the tape is superconducting) was studied in a first paper [7].…”

Section: Introductionmentioning

confidence: 99%

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Breakdown Phenomena in Liquid Nitrogen Under Synchronized Transient Boiling and Impulse Voltage

Chassagnoux

Lesaint

Bonifaci

et al. 2023

IEEE Trans. Dielect. Electr. Insul.

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Resistive superconducting fault current limiters constitute a promising solution for high voltage networks. During the resistive current limitation, transient overvoltages and heat dissipation occur on superconducting tapes, inducing fast boiling of surrounding liquid nitrogen (LN2). An experimental system reproducing the fast transient heating of a tape electrode, synchronized with a high voltage impulse is described. Breakdown voltages measurements in both polarities are carried out versus synchronization delay, pressure (0.10 to 0.40 MPa), temperature (77 K and 65 K). Breakdown voltages show complex variations with these parameters. More insight is obtained from the recording of prebreakdown phenomena (streamer). The size of vapor bubbles has a large and counter-intuitive influence on streamer initiation: the smaller bubbles, the lower inception voltage. Subcooling LN2 (by decreasing temperature and/or increasing pressure) sometimes has a beneficial influence (quenching of negative streamer propagation), but deleterious effects can be as well observed in other circumstances (by favouring positive streamer initiation).

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Section: Streamers In Liquidssupporting

confidence: 69%

Section: A Experimental Setupmentioning

confidence: 99%

Section: A Experimental Setupmentioning

confidence: 99%

Section: A Experimental Setupmentioning

confidence: 99%

“…The study of dielectric breakdown in "normal" conditions (i.e. when the tape is superconducting) was studied in a first paper [7].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Breakdown Phenomena in Liquid Nitrogen Under Synchronized Transient Boiling and Impulse Voltage

Chassagnoux

Lesaint

Bonifaci

et al. 2023

IEEE Trans. Dielect. Electr. Insul.

Self Cite

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Electrical Breakdown in Gaseous Nitrogen at Cryogenic Temperature with a Heated Tape Electrode

Chassagnoux,

Bonifaci,

Lesaint

et al. 2023

2023 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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With the objective to better understand and design the electrical insulation of resistive superconducting fault current limiters (r-SCFCL), breakdown experiments were performed in liquid (LN2), and gaseous (LN2) nitrogen. Conditions relevant to the extreme case of severe boiling, occurring during superconducting/resistive transition, were chosen. A tape-shaped electrode rapidly heated by impulse Joule effect is used to closely represent the specific conditions occurring during the transition. Comparisons with previous experiments carried out in LN2 show that the reduction of breakdown voltage during transition results from the replacement of LN2 by GN2, and from heating of GN2. Breakdown voltages in GN2 with divergent tape-plane geometry can be modelled using the streamer criterion.

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Pre-Breakdown and Breakdown Phenomena in Liquid Nitrogen With a Tape–Plane Electrode Geometry

Cited by 2 publications

References 30 publications

Breakdown Phenomena in Liquid Nitrogen Under Synchronized Transient Boiling and Impulse Voltage

Breakdown Phenomena in Liquid Nitrogen Under Synchronized Transient Boiling and Impulse Voltage

Electrical Breakdown in Gaseous Nitrogen at Cryogenic Temperature with a Heated Tape Electrode

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