조명전기설비학회논문지 (Journal of the Korean Institute of Illuminating and Electrical Installation Engineers)

  • 제21권5호
  • /
  • Pages.90-98
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  • 2007
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  • 1229-4691(pISSN)
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  • 2287-5034(eISSN)
한국조명전기설비학회 (The Korean Institute of IIIuminating and Electrical Installation Engineers)
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FMEA에 근거한 LV URD 케이블의 고장분석

Failure Analysis of LV URD Cable based on FMEA

  • 송길목 (전기안전연구원 설비안전연구그룹) ;
  • 한운기 (전기안전연구원 설비안전연구그룹) ;
  • 김영석 (전기안전연구원 설비안전연구그룹) ;
  • 김선구 (전기안전연구원 설비안전연구그룹) ;
  • 곽희로 (숭실대학교 전기제어시스템 공학과)
  • 발행 : 2007.06.30
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초록

본 연구의 목적은 고장 케이블(LV URD(low voltage underground) cable)의 원인을 밝히는데 있다. 분석방법은 외형패턴, 열패턴, 표면구조 분석, 열분석, 성분분포 등 다양한 분석기기를 이용하여 분석되었다. 국제기준과 사고케이블 제작회사가 제시하고 있는 규정이 일치하는지의 여부를 분석하였으며, 국내산 케이블과의 비교분석하였다. 그 내용을 요약하면 다음과 같다. (1) 사고케이블 자체의 절연성능을 저하시키는 요인으로 IEC 60502-1과 IEC 60811-1-1에 의한 절연피복의 최소 두께가 시방(specification)과 일치하지 알음을 확인하였다. (2) 적외선분광기에 의해 적외선흡광피크가 동일 재료에서 일치하지 않는 것으로 나타났다. (3) PVC bedding 부분이 열적으로 취약하여 장시간 현장에 노출되어 사용되는 경우 이와 유사한 패턴의 사고를 유발할 것으로 판단된다.

The objective of this investigation was to reveal the cause of the faulted cable(LV URD(low voltage underground) cable). For the analysis, various types or equipments such as external pattern, thermal pattern, surface structure, thermal analysis, and property distribution were deployed. The international standards and the specification provided by the manufacturer of faulted cable were examined whether it fit the standards. The summary is as follows. (1) Discovered as a factor lowering insulation performance of the faulted cable: minimum thickness of the insulation layer specified by IEC 60502-1 and IEC 60811-1-1 was not fit. (2) Infrared absorption peaks measured by FT-IR spectrometer revealed that the measurements made for the same material did not conform and it is an important basis for proving heterogeneous composition of the insulation material. (3) It was found that PVC bedding was thermally fragile and therefore long term exposure at the site could cause similar fault pattern.

키워드

참고문헌

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