通过对北京地区的多根退役110 kV及220 kV交联聚乙烯电缆绝缘层进行差示扫描量热、热失重和傅里叶红外光谱等分析,研究了绝缘材料的聚集态结构及热稳定性.结果表明:电缆带电运行使XLPE的熔程变宽,带电运行的时间与材料的结晶度没有明显的关系.热失重和傅里叶红外光谱结果反映出退役XLPE电缆中只有少数试样发生了一定程度的热氧老化,大多数电缆绝缘层没有发生明显的热氧老化.
The aggregation structure and thermal stability of the insulating materials from 110 kV and 220 kV XLPE cables out of service in Beijing were studied by differential scanning calorimetry(DSC), ther-mo-gravimetric analysis(TGA) and Fourier transform infrared spectroscopy(FT-IR). The results show that the melting range of the XLPE broadens if the cables are in live operation, and there are no obvious re-lationships between the operating time and crystallinity of the materials. The results of TGA and FT-IR indicate that only few samples exist certain extent of thermal oxidative aging, and most samples show no obvious thermal oxidative aging.
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