10_yasu_degra_ldpe - 116 Y. Sekii: Degradation of...

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Y. Sekii: Degradation of Low-density Polyethylene and Cross-linked Polyethylene by Partial Discharge 1070-9878/10/$25.00 © 2010 IEEE 116 Degradation of Low-density Polyethylene and Cross-linked Polyethylene by Partial Discharge Yasuo Sekii Sekii Consulting Engineering Funabashi, Chiba, 274-0825, Japan ABSTRACT To study the degradation of low-density polyethylene (LDPE) and cross-linked polyethylene (XLPE) by partial discharge (PD), experiments were conducted in a nitrogen (N 2 ) and (N 2 +O 2 ) gas atmosphere. After being subjected to the PD, samples were examined using atomic force microscopy (AFM) and FTIR. The AFM images clearly revealed the creation of pits on the surface of degraded samples. A large difference in the pit pattern was observed between samples subjected to the PD in N 2 and those subjected to the PD in (N 2 +O 2 ). The FTIR spectra detected in samples subjected to the PD in (N 2 +O 2 ) showed that carbonyl compounds were produced on the surface of degraded LDPE. Experiments were performed using an experimental system incorporating GC-MS to measure the gas components produced during degradation. Results of experiments showed that carbon dioxide (CO 2 ) is produced when LDPE and XLPE are subjected to the PD in an oxygen-containing atmosphere. The amount of CO 2 was found to increase concomitantly with the period of voltage application and oxygen concentration in the area where PD occurs. Based on experimental results, the processes of LDPE and XLPE degradation by PD were examined along with the antioxidant effect on degradation. Index Terms — partial discharge (PD), degradation, LDPE, XLPE, antioxidant, AFM, FTIR, GC-MS, absorbance, carbonyl compound. 1 INTRODUCTION POLYMERIC insulating materials are widely used in electrical power equipment. These materials are known to be deteriorated when they are subjected to partial discharges (PD) [1–6]. To analyze that deterioration, observations of samples using optical or electron microscopy are widely adopted along with analyses of substances produced through deterioration using FTIR spectroscopy [2, 7, 8]. Moreover, observation of samples using atomic force microscopy (AFM) is useful to grasp the degradation of aged dielectric materials [9, 10]. To study the influence of oxygen on deterioration of low-density polyethylene (LDPE) by PD, the author conducted experiments in a mixed nitrogen and oxygen (N 2 +O 2 ) atmosphere. The author has reported degraded samples that were examined using AFM and FTIR [11]. The author also conducted experiments, using an experimental system incorporating GC-MS, to measure the gas constituents produced during degradation. Based on results of those experiments, the author elucidated the mechanism of deterioration by PD and effects of antioxidants on deterioration by PD [12, 13].
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10_yasu_degra_ldpe - 116 Y. Sekii: Degradation of...

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