Arc radiation monitoring in a commercial EHV circuit breaker using optical fibre transmission

Shimmin, D.W.; Jones, G.R.

doi:10.1088/0022-3727/21/5/011

Cited by 7 publications

(6 citation statements)

References 5 publications

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“…Firstly, the variables describing the geometrical relationship, such as r and R a , were normalized with respect to the radius R c of the arc chamber. Secondly, an equation for the output I 1 may be written [21,22]:…”

Section: The Detector Outputmentioning

confidence: 99%

“…The implication of these results is that the charactersitic curves shown in figures 4(a) and (b) and calculated for R * a = 0.1 also apply for locating the axis of any arc with R * a ≤ 0.1 with a high degree of accuracy. With regard to power-frequency conditions in SF 6 circuit breakers, assuming an arc-current density of 40 A mm −2 and a nozzle radius R c = 17.5 mm [21] and with β = 1 and p = 35 mm, it is estimated that the arc-axis position can be accurately determined for instantaneous currents below 380 A with the characteristic curves of figures 4(a) and…”

Section: Arc-radius Effectsmentioning

confidence: 99%

See 1 more Smart Citation

Position location of a filamentary arc using a tristimulus chromatic technique

Yokomizu¹,

Spencer²,

Jones³

1998

J. Phys. D: Appl. Phys.

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A technique is proposed for determining the location of an arc-discharge filament in a circuit breaker or a plasma torch utilizing only three photo-detectors, with the same spectral sensitivity, to observe the optical radiation emitted from the arc. The three detectors are placed at different azimuthal positions perpendicular to the central axis of the arc filament and are arranged symmetrically with respect to the central axis of the arc chamber and with their angular responses non-orthogonal. Outputs from the photo-detectors are analytically processed to yield two chromatic parameters, (the nominal radial mode) and (the dominant azimuthal mode), which define the arc location in the laboratory frame (, ). and are defined by algorithms used in chromatic processing. As an illustration, the technique has been applied to interpret some experimental results for determining the location of an arc filament lying within the nozzle of a gas-blast circuit breaker.

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Section: The Detector Outputmentioning

confidence: 99%

Section: Arc-radius Effectsmentioning

confidence: 99%

Position location of a filamentary arc using a tristimulus chromatic technique

Yokomizu¹,

Spencer²,

Jones³

1998

J. Phys. D: Appl. Phys.

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“…Hence, the bundle of fibres accepts arc radiation from a region with spatial dimensions of 4.3 mm × 1.8 mm. Such optical fibre techniques are widely used in plasma diagnoses [38][39][40][41].…”

Section: Spectroscopic Observation Around the Nozzle Throatmentioning

confidence: 99%

Transient distribution of metallic vapour concentration in a post-arc channel after current zero along the nozzle axis in a flat-type gas-blast quenching chamber

Tanaka

Yokomizu

Matsumura

et al. 1996

J. Phys. D: Appl. Phys.

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A method for estimating metallic vapour concentration in a post-arc channel on the basis of a spectroscopic method was proposed. Using the method, the axial distribution of metallic vapour concentration in a post-arc channel was measured around the nozzle throat in a flat-type gas-blast quenching chamber. In the chamber iron was intentionally used as an electrode material since Fe spectral lines at wavelengths of 426.0 and 442.7 nm have very much higher radiation intensities than particles such as , F or Cu at temperatures below 6000 K. The proposed method was capable of determining the iron vapour concentration up to after current zero in the experiment. It was found that has a magnitude around % along the nozzle axis during the period from -60 to after current zero for 5 kA arcs.

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“…monitoring of the amount of radiant power emitted (following laboratory calibration (Shimmin and Jones (1988) as an indication of nozzle wear.…”

Section: Optical Emission During Arcingmentioning

confidence: 99%

“…identification of impurity species (through their characteristic spectral emissions) and which may in principle be related to aging effects and the severity of arcing during current interruption. monitoring of the amount of radiant power emitted (following laboratory calibration(Shimmin and Jones (1988) as an indication of nozzle wear.Examples of some typical results from some site tests on a 63kA 425kV SF6 circuit breaker are shown on figure 6. Typical test results of arc light emission with optical fibre transmission (peak arc current = 63kA).…”

mentioning

confidence: 99%