Spectroscopic Approach to the Analysis of High Current Arcs in SF6

Okuda, Satoshi; Ueda, Y.; Murai, Y.; Miyamoto, Toshio; Doi, Yoshihiro; Uenosono, Chikasa

doi:10.1109/tps.1980.4317346

Cited by 35 publications

(16 citation statements)

References 2 publications

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“…λ < 50 nm). In the case of pure helium plasmas, we also compared the spectral absorption coefficients obtained with this extrapolated Biberman-Schlüter factor and the results deduced from the hydrogen-like atoms approximation developed by Okuda et al [41]. For a temperature equal to 10 kK, this comparison is shown in figure 4 and highlights a good agreement for wavelengths between 100 and 1000 nm (0.2998 × 10 15 Hz < ν < 2.998 × 10 15 Hz) whereas the results obtained with the Biberman-Schlüter factor ξ He λ diverge for wavelengths inferior to 100 nm.…”

Section: Continuum Radiationmentioning

confidence: 99%

Net emission of Ar–H₂–He thermal plasmas at atmospheric pressure

Cressault¹,

Rouffet²,

Gleizes³

et al. 2010

J. Phys. D: Appl. Phys.

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The Net Emission Coefficient (NEC) has been calculated for Ar-H 2 -He thermal plasmas and for a temperature range from 5000K to 30000K. The plasma is supposed to be in Local Thermodynamic Equilibrium (LTE) at atmospheric pressure. This study takes into account the radiation resulting from the atomic continuum, the molecular continuum, and the atomic lines. A particular attention has been paid to the treatment of helium lines broadenings. The results of net emission coefficients are presented for pure gases and Ar-H 2 -He mixtures. Radiation is weak in pure helium at low temperatures because of the high ionization energy of this species. On the opposite, at very high temperature, the influence of hydrogen tends to decrease because ionic lines do not exist for this last species. Finally, a small proportion of helium in Ar-H 2 mixtures does not change the net emission coefficient because of the weak intensity of the helium lines.

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Section: Continuum Radiationmentioning

confidence: 99%

Net emission of Ar–H₂–He thermal plasmas at atmospheric pressure

Cressault¹,

Rouffet²,

Gleizes³

et al. 2010

J. Phys. D: Appl. Phys.

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“…It has been confirmed that electrode vapour dominates the arc when the current above 10 kA [17] and strong copper atom lines were observed (Figure 6). However, due to the self-absorption effect, the spectral lines were emerged with the strong continuum [17].…”

Section: Resultsmentioning

confidence: 81%

“…However, due to the self-absorption effect, the spectral lines were emerged with the strong continuum [17]. Conventionally, temperature and metal vapour density can be estimated via spectroscopic analysis when the arc plasma is proven to be LTE and optically thin [18,19,20].…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic On-Line Monitoring of Cu/W Contacts Erosion in HVCBs Using Optical-Fibre Based Sensor and Chromatic Methodology

Wang

Jones

Spencer

et al. 2017

Sensors

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Contact erosion is one of the most crucial factors affecting the electrical service lifetime of high-voltage circuit breakers (HVCBs). On-line monitoring the contacts’ erosion degree is increasingly in demand for the sake of condition based maintenance to guarantee the functional operation of HVCBs. A spectroscopic monitoring system has been designed based upon a commercial 245 kV/40 kA SF6 live tank circuit breaker with copper–tungsten (28 wt % and 72 wt %) arcing contacts at atmospheric SF6 pressure. Three optical-fibre based sensors are used to capture the time-resolved spectra of arcs. A novel approach using chromatic methods to process the time-resolved spectral signal has been proposed. The processed chromatic parameters have been interpreted to show that the time variation of spectral emission from the contact material and quenching gas are closely correlated to the mass loss and surface degradation of the plug arcing contact. The feasibility of applying this method to online monitoring of contact erosion is indicated.

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“…1,9) The radiative recombination is calculated with the knowledge of the Biberman factors (for argon species only 10) ). As this factor is not available in the literature for other atomic species, we applied the hydrogen-like approach 11) with the knowledge of the energy levels, the statistical weights and the quantum numbers issued from NIST 12) and Kurucz et Peyterman databases. 13,14) The radiative attachment is obtained knowing the photodetachment cross-sections and the electron affinities of the atoms (0.043 ± 0.007 eV 15) for Ca, 0.547 eV 16) for Na, 0 eV 16) for Hg, 0.814 eV 16) for W, 0.40 ± 0.05 eV 17) for Tl, 0.048 eV 18) for Sr, and 0.611 eV 16) for Dy.…”

Section: Continuous and Discontinuous Radiationmentioning

confidence: 99%

Radiative properties of ceramic metal-halide high intensity discharge lamps containing additives in argon plasma

Cressault¹,

Teulet²,

Zissis³

2016

Jpn. J. Appl. Phys.

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The lighting represents a consumption of about 19% of the world electricity production. We are thus searching new effective and environment-friendlier light sources. The ceramic metal-halide high intensity lamps (C-MHL) are one of the options for illuminating very high area. The new C-MHL lamps contain additives species that reduce mercury inside and lead to a richer spectrum in specific spectral intervals, a better colour temperature or colour rendering index. This work is particularly focused on the power radiated by these lamps, estimated using the net emission coefficient, and depending on several additives (calcium, sodium, tungsten, dysprosium, and thallium or strontium iodides). The results show the strong influence of the additives on the power radiated despite of their small quantity in the mixtures and the increase of visible radiation portion in presence of dysprosium.

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Spectroscopic Approach to the Analysis of High Current Arcs in SF6

Cited by 35 publications

References 2 publications

Net emission of Ar–H₂–He thermal plasmas at atmospheric pressure

Net emission of Ar–H₂–He thermal plasmas at atmospheric pressure

Spectroscopic On-Line Monitoring of Cu/W Contacts Erosion in HVCBs Using Optical-Fibre Based Sensor and Chromatic Methodology

Radiative properties of ceramic metal-halide high intensity discharge lamps containing additives in argon plasma

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Spectroscopic Approach to the Analysis of High Current Arcs in SF6

Cited by 35 publications

References 2 publications

Net emission of Ar–H2–He thermal plasmas at atmospheric pressure

Net emission of Ar–H2–He thermal plasmas at atmospheric pressure

Spectroscopic On-Line Monitoring of Cu/W Contacts Erosion in HVCBs Using Optical-Fibre Based Sensor and Chromatic Methodology

Radiative properties of ceramic metal-halide high intensity discharge lamps containing additives in argon plasma

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Product

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Net emission of Ar–H₂–He thermal plasmas at atmospheric pressure

Net emission of Ar–H₂–He thermal plasmas at atmospheric pressure