Life expectancy of a thermally aged oil impregnated pressboard (OIP) in the presence of corrosive dibenzyl disulphide (DBDS) is studied in this work using a fast estimation method based on level of diffusion of Cu contaminant. Data from laser induced breakdown spectroscopy (LIBS) is used as the degradation parameter. Thermogravimetric analysis (TGA) is used for rapid evaluation of life expectancy at various temperatures. Aged OIP material is tested for its surface flashover breakdown strength and its thermal stability is studied by TGA and differential scanning calorimetry. Thermal activation energy is estimated using Flynn-Wall-Ozawa method and is agreement with isothermally calculated values. Aging law is derived and found to be nearly first order based on which temperature dependent life expectancy law is formulated. LIBS data of OIP collected from a failed transformer is considered to be end-of-life condition. Estimated life expectancy values using proposed fast method are compared with traditional long-aging evaluation and are in good agreement. Increase in corrosive DBDS concentration and change in aging medium using proposed method and are found to have a significant impact on life expectancy of the OIP insulation.

中文翻译：

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热老化的铜污染物扩散的油浸压板的预期寿命估算

在这项工作中，使用一种基于铜污染物扩散水平的快速估算方法，研究了在存在腐蚀性二苄基二硫化物（DBDS）的情况下，热老化的浸油纸板（OIP）的预期寿命。来自激光诱导击穿光谱法（LIBS）的数据用作降解参数。热重分析（TGA）用于快速评估各种温度下的预期寿命。测试了老化的OIP材料的表面闪络击穿强度，并通过TGA和差示扫描量热法研究了其热稳定性。使用Flynn-Wall-Ozawa方法估算热活化能，并与等温计算值一致。推导了老化定律，并发现该定律几乎是一阶的，基于该定律，可以得出温度相关的预期寿命定律。从故障变压器中收集的OIP的LIBS数据被认为是报废条件。使用提议的快速方法估算的预期寿命值与传统的长效评估进行了比较，并且吻合良好。使用提议的方法增加腐蚀性DBDS浓度并改变老化介质，发现对OIP绝缘的预期寿命有重大影响。