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氧化安定性是标志变压器油抵抗外界氧化性物质能力的指标,油液中颗粒物的存在极易影响油液的氧化安定性能。根据ISO4406标准,采用均匀设计法,配制了24组含Cu、Fe、SiO_2的不同粒径不同污染度的颗粒污染物油样并对其进行了热氧化实验,测试了热氧化前后油样的酸值,获得了不同组分、不同含量的颗粒物对油液氧化安定性的影响规律;并采用偏最小二乘法建立了油中不同组分、不同粒径、不同含量的颗粒物与油样氧化安定性之间的数学模型。结果表明应用建立的Cu、Fe颗粒与油液氧化安定性之间的数学模型对验证集的决定系数和均方根误差分别为0.939 9、0.442 1×10~(-2);含有SiO_2非金属颗粒油液的热氧化后酸值小于含金属颗粒油液的热氧化后酸值,金属颗粒在粒直径为15μm时对变压器油氧化安定性能的影响最为显著,变化范围为0.066×10~(-3),油液氧化安定性随着铜、铁颗粒含量的增加而降低;油中SiO_2颗粒的存在延缓了油液的老化速度,一定程度上提高了油液的氧化安定性。
Oxidation stability is an indicator of transformer oil resistance to external oxidizing substances, the presence of oil particles can easily affect the oil oxidation stability. According to ISO4406 standard, 24 groups of particulate contaminants with different particle sizes of Cu, Fe and SiO_2 with different particle sizes were prepared by the uniform design method and their thermal oxidation experiments were carried out. The effects of acid Value, obtained different components, different content of particles on the stability of the oil oxidation stability; and the use of partial least squares method established in the oil of different components, different particle size, different content of particulate matter and oil oxidation stability The mathematical model between. The results show that the coefficient of determination and the root mean square error of the validation set are 0.939 9 and 0.442 1 × 10 -2, respectively. The results show that the content of SiO 2 nonmetal When the particle size is 15μm, the oxidation stability of transformer oil is the most significant. The range of variation is 0.066 × 10 ~ (- 3) The oxidation stability of the oil decreases with the increase of the content of copper and iron particles. The presence of SiO 2 particles in the oil retards the aging rate of the oil and improves the oxidation stability of the oil to a certain extent.