Optical-fibre-based investigations of contact travel, gas pressure and particle concentration in SF6 puffer circuit breakers

The Gabor transform basis of chromatic monitoring

“…As an example, the temporal variation of the piston velocity used for suddenly compressing gas in a high voltage circuit breaker and measured with an optical fibre chromatic displacement sensor [24] (total displacement 20 cm) is shown in figure 9(a). The velocity values are determined from optical dominant wavelength variations using Gabor processors of the form defined by equation ( 16) with an optical sensing element giving M(λ)αx (21) where x is the piston displacement [24]. The time responsivities R m (t) of the Gabor processors used to sample the time varying signal are also shown in figure 9(a), each giving an output…”

Arc temperature profile measurement and characteristic analysis on an SF 6 high‐voltage CB

“…The arc, the gas flow, and their interaction in extinguish chamber is the key focus on the research on the breaking capacity [1][2][3][4][5]. Although models are becoming complex and accurate, there are still improvements needed to be made before the models can be used as a substitution for experiments, due to the complicated arc theory in CBs.…”

An optical fibre sensor for particle concentration measurement in water systems based on inter-fibre light coupling between polymer optical fibres

“…A number of sensor configurations have been proposed for particle concentration measurement which are based on fibre-optic sensors (Brenci et al, 1995;Bilyi et al, 1996;Bergougnoux et al, 1999;Isaac et al, 1999). However, these have generally relied on light being launched from the end of one fibre and collected by another fibre or by a standard photodetector.…”