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Journal of Korean Institute of Fire Science and Engineering 2005;19(2):63-68.
Published online June 30, 2005.
고감도형 누전차단기 접점의 스위칭에 따른 아크 비산 특성
최충석, 김동우, 김영석, 이기연
1전기안전연구원(한국전기안전공사 부설)
2전기안전연구원(한국전기안전공사 부설)
3전기안전연구원(한국전기안전공사 부설)
4전기안전연구원(한국전기안전공사 부설)
The Arc Dispersion Properties by Switching of High Sensitivity Type RCD Contacts
Choi Chung-Seog , Kim Dong-Woo , Kim Young-Seok , Lee Ki-Yeon
1Electrical Safety Research Institute, subsidiary of KESCO
2Electrical Safety Research Institute, subsidiary of KESCO
3Electrical Safety Research Institute, subsidiary of KESCO
4Electrical Safety Research Institute, subsidiary of KESCO
요약
본 논문에서는 고감도형 누전차단기의 스위칭에 따른 접점의 아크 비산 특성을 해석하였다. 누전차단기(RCD) 스위칭에 따른 접점의 비산과정 및 인접가연물로의 착화과정은 고속카메라(High Speed Imaging System)를 이용하여 촬영하였다. 부하는 전등부하 60W와 전열부하 950 W를 병렬로 연결하였다. 정상상태의 RCD의 경우 아크의 생성부터 소멸까지의 시간은 약 2.3[ms]을 알 수 있었으며, 아크가 비산될 때 주변에 인접가연물(탈지면)을 착화시키지 못했다. 염수에 의해 오염된 접점의 경우 아크의 비산범위가 훨씬 컸으며 지속시간도 3.3[ms]동안 더 지속되었다. 그리고 주위에 가연성 물질에 착화가 가능하였다. RCD에 의한 사고를 예방하기 위해서는 수분, 먼지 등의 환경적 요인에 주의해야 하며, RCD소자는 난연성 재료를 사용해야 된다.
Abstract
In this study, the arc dispersion properties were analyzed according to switching of high sensitive type Residual Current Protective Device(RCD) contacts. Arc dispersion and ignition process was taken by high speed imaging system(HSIS). In this experiment, electric lamps(60 W) and heaters(950 W) were connected in parallel as loads. In case of normal RCD, it took about 2.3(ms) from the generation of arc to the extinction of uc. When arc was dispersed in normal RCD, it did not ignite cotton. Whereas, in case of RCD deteriorated by NaCl solution, the range of arc dispersion was wider and the arc lasted for 3.3[ms] more compared to normal RCD. And the arc ignited cotton. In order to prevent accidents caused by RCD, we should be careful of environmental factors, such as dust and humidity, and the parts of RCD should be used as incombustible materials.
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