FTIR and SEM Analysis of Breakdown XLPE Cable Insulation

The degradation and breakdown of high-voltage XLPE cable insulation are usually followed by morphological and chemical changes. This paper presents the outcome of Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) tests on broken-down cables. Tests are conducted on several sample points of the broken-down cable at one of PLN’s substations. As a comparison, the tests are also applied to the unbroken-down part of the same cable roll the unbroken-down cable of another brand. Striking differences are obtained from the results of the tests. The experimental results show a higher absorption peak at the double bond area on the cable that breakdown indicates the high presence of the carbonyl group due to polymer oxidation. And the cable that is one roll with the cable that breakdown has a high oxidation index even though it is relatively new. This proves the lower quality of the cable that breakdown compared to the other brand.