Partial discharges at a triple junction metal/solid insulator/gas and simulation of inception voltage

Duy, Chau Tran; Bonifaci, Nelly; Denat, А.; Lesaint, Olivier; Caliap, Lucian; Girodet, A.; Gelloz, Bernard; Ponchon, Philippe

doi:10.1016/j.elstat.2008.01.011

Cited by 25 publications

(12 citation statements)

References 15 publications

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“…In addition, for CO 2 the obtained values for K and the spread in these values are rather high. Similar results have been reported by [28]. The obtained values will be now discussed in more detail.…”

Section: Electrodeless Streamer Inceptionsupporting

confidence: 88%

Raether–Meek criterion for prediction of electrodeless discharge inception on a dielectric surface in different gases

Chvyreva

Pancheshnyi

Christen

et al. 2018

J. Phys. D: Appl. Phys.

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Electrodeless streamer inception on an epoxy surface under AC voltage stress was investigated for different gas compositions and pressures, with a focus on the pressure region below 1 bar. For this purpose, we used a set-up with cylindrical electrodes embedded out-of-axis in a cylindrical epoxy rod. Experiments were performed in N2, SF6, ambient air, Ar and CO2. The discharge inception voltage was measured, from which the critical value K of the ionization integral was reconstructed assuming a non-disturbed Laplacian field distribution. We have validated that for electropositive gases Ar an N2 the generally assumed value of K = 10 is in good agreement with our measurements. For electronegative gases, however, the experimentally obtained values turned out to be considerably higher. We attribute this discrepancy mainly to the statistical time delay of the first electron; to increase the probability of discharge inception in a critical region, it was necessary to extend the critical area by means of applying an overvoltage to the system.

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Section: Electrodeless Streamer Inceptionsupporting

confidence: 88%

Raether–Meek criterion for prediction of electrodeless discharge inception on a dielectric surface in different gases

Chvyreva

Pancheshnyi

Christen

et al. 2018

J. Phys. D: Appl. Phys.

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“…The most likely place on the surface DBD to find E is at the edge of the powered electrode, at the metal-gas-dielectric triple junction. Field enhancement at such junctions can lead to partial discharges, which has been studied in N 2 and SF 6 but only up to 0.45 MPa (Duy et al 2008). While two discharge regimes were found, the onset voltages for both increased linearly with the gas pressure, unlike the case for the field-emitting regime.…”

Section: Charge Of Field-emitting Regime Obeys the Fowler-nordheim Eq...mentioning

confidence: 99%

Surface dielectric barrier discharges exhibiting field emission at high pressures

Pai

Stauss

Terashima

2014

Plasma Sources Sci. Technol.

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Surface dielectric barrier discharges (DBDs) are investigated experimentally in CO 2 from atmospheric pressure up to supercritical conditions. Two discharge regimes are generated using 10 kHz ac excitation. The 'standard' regime is similar to previously studied surface DBDs in terms of onset voltage as a function of pressure, as well as electrical and optical emission characteristics. However, a 'field-emitting' regime emerges starting from 0.7 MPa that exhibits constant onset voltage up to 7.9 MPa, purely continuum emission spectra in the visible/near-infrared range and current waveforms similar to an atmospheric-pressure Townsend discharge with ionization instabilities. The maximum amount of negative charge deposited as a function of the applied voltage amplitude is consistent with the Fowler-Nordheim equation, which demonstrates the presence of field emission. Furthermore, this behavior cannot be attributed to the Townsend or streamer ionization mechanisms, secondary electron emission or non-discharge processes. No field-emitting structures are specially added to the electrodes. The onset voltage of the field-emitting regime does not follow the modified Paschen's law for field emission-assisted breakdown.

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“…The effect of gas temperature on breakdown can be described using the equation of the ideal gas law, see (1), of the free mean path, see (2), and of the electric field strength, see (3), which is considered to be constant near the triple junction:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Since the local electric field at the triple junction is reinforced due to differences in relative permittivity of the solid insulator and the surrounding gas, voltages below the threshold for electrical breakdown lead to the inception of partial discharges (PD). PD can lead to an accelerated aging of the insulation system and cause low-level damage which could accumulate and finally end up in complete breakdown [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Study of partial discharge and breakdown phenomena at triple junctions under various conditions of pressure and temperature

Szilágyi,

Molinié,

Kirkpatrick

et al. 2024

J. Phys.: Conf. Ser.

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The presence of a triple junction constitutes a potential source of failure in many industrial applications. The reinforcement of the local electric field due to differences in relative permittivity facilitates the formation of partial discharges (PD) which weaken the insulation system and eventually lead to complete breakdown. Additionally, severe environmental conditions (temperature, pressure) associated with certain applications (e. g. nuclear or aeronautical sector) should be considered because of their influence on discharge phenomena occurring at triple junctions. In this study, the behaviour of partial discharge inception voltage (PDIV) and of breakdown (flash-over) voltage (BIV) is compared in the case of a triple junction with an aluminium oxide disc as a solid insulator when the system is heated up to 400 °C. While the PDIV decreases strongly for temperatures above 300 °C, this effect disappears for the BIV. It is proposed that this behaviour is due to the fact that relative permittivity of the aluminium oxide disc increases with temperature at low frequencies, but remains relatively stable at high frequencies, regardless of the temperature.

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Partial discharges at a triple junction metal/solid insulator/gas and simulation of inception voltage

Cited by 25 publications

References 15 publications

Raether–Meek criterion for prediction of electrodeless discharge inception on a dielectric surface in different gases

Raether–Meek criterion for prediction of electrodeless discharge inception on a dielectric surface in different gases

Surface dielectric barrier discharges exhibiting field emission at high pressures

Study of partial discharge and breakdown phenomena at triple junctions under various conditions of pressure and temperature

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