| Title |
Failure Analysis of LV URD Cable based on FMEA |
| Authors |
Kil-Mok Shong ; Woon-Ki Han ; Young-Seok Kim ; Sun-Gu KimSun-Gu Kim; Hee-Ro Kwak |
| Keywords |
FMEA(Failure modes and effects analysis) ; Faulted cable ; PVG Bedding ; Thermal Analysis ; IEC 60502-1 ; IEC 60811-1-1 ; FT-IR Spectrometer |
| Abstract |
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 extrnal 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 ET-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. |