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分析水降解率对变压器油绝缘的影响!

来源:https://www.jnwdsh.com/ 日期:2021-06-24 发布人:woduanshihua
水对纤维素基电绝缘材料的降解有重要影响。
Water has an important influence on the degradation of cellulose based electrical insulating materials.
水一般会增加降解率,而纤维素在本质上是吸湿的。在变压器使用之初,绝缘材料中的含水量不到0.5%,变压器油也被烘干。
Water generally increases the degradation rate, while cellulose is hygroscopic in nature. At the beginning of the transformer, the moisture content of the insulation material is less than 0.5%, and the transformer oil is also dried.
随着绝缘纸的老化,系统内的含水量显著增加。由于绝缘纸对水的亲和力很强,水分主要存在于绝缘纸中而不是变压器油中。新投运的变压器通常含水量会低于0.5%,而运行几年后,绝缘纸中的含水量可能会增加到4%~5%,变压器内的含水量在其使用期间可能会增加5%,具体取决于运行环境和其他条件。
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With the aging of insulation paper, the water content in the system increases significantly. Due to the strong affinity of insulating paper for water, water mainly exists in insulating paper rather than transformer oil. The water content of the new transformer is usually lower than 0.5%. After several years of operation, the water content in the insulation paper may increase to 4% - 5%, and the water content in the transformer may increase by 5% during its service period, depending on the operating environment and other conditions.
不仅如此,水分子还在纤维素链之间积累,纤维素的热降解也会产生水。水导致纤维素链进一步分解,从而产生游离葡萄糖。因此,在糖苷键中加入水分子会导致链分解。实验表明,链状裂变可以指示水解降解速率。
Moreover, water molecules also accumulate between cellulose chains, and the thermal degradation of cellulose also produces water. Water causes the cellulose chain to break down further, resulting in free glucose. Therefore, the addition of water to the glycosidic bond will lead to chain decomposition. The results show that chain fission can indicate the rate of hydrolysis.
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