• Journal of Sensor Science and Technology
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• v.25 no.3
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• pp.208-212
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• 2016

In this work, a loop sensor for Arc-Flash detections has been developed in order to trip a circuit breaker within 2.5 ms after an Arc-Flash event. For an efficient capturing of the flash light, plastic optical fibers, where light attenuations are larger than those in silica-based ones, with different diameters and surface conditions were utilized. The performance was comparatively analyzed with those of a point sensor and a commercialized product. The point sensor module was designed for hemisphere-like capturings of Arc-Flashes larger than 3 kA at 2 meters from the sensor. On the other hand, the loop sensor allowed 360-degree-detections around the fiber axis and the measurement range was dependent on the length of the fiber connected to the sensor module. The trip-level-dependent brightness measurement results showed that the fabricated point sensor and loop sensor satisfied a brightness condition, 10~40 klux, and the responses of the system to Arc-Flashes were completed within 2.5 ms.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.06a
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• pp.221-221
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• 2010

수배전반 내부에서 Arc 사고 발생시 동반되는 광신호를 검출할 수 있는 광센서를 개발하였다. 개발된 광센서는 특정 부위에 설치되어 해당 위치에서 발생하는 광신호를 검출하는 Point Sensor와 넓은 범위를 감시할 수 있는 Loop Sensor의 두 가지 형태로 구성되어 있다. 두 가지 모두 광섬유를 통하여 계전기 등에 부착되며, 일반 통신용 광섬유보다 큰 core를 갖는 특수 광섬유가 사용되었다. Point Sensor는 광섬유 끝단에 부착된 Cap에 의해 광신호가 검출되고, Loop Sensor는 광섬유 자체가 Sensor로 사용되어 광신호의 검출 및 전승을 수행한다. Point Sensor에 부착되는 Cap은 보다 넓은 범위 감시하고, 광신호 발생 위치에 따른 편차를 줄일 수 있는 형태로 설계되었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.726-728
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• 2013

Optoelectronic arc discharge sensor was used to detect arc discharge inside power distribution panel. Arc discharge is fatal to power system once it begins, thus preventive detection is necessary before power failure occurs. Optoelectronic detection method was used to avoid direct electrical contact to power apparatus inside power distribution panel. 180 degree detection angle and detection range far exceeding 6m, which was sufficient for monitoring purpose, was achieved using the photodiode having $7.5mm^2$ of active surface area and flash source with $0.4cal/cm^2$ energy density, which is equivalent to 1.9J with $2.16cm^2$ emitting area. The response speed of arc discharge sensor was measured to be below 1 msec. The above optoelectronic arc discharge sensor was measured to be sensitive enough to detect 0.94 pC charge.