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首页> 外文期刊>IEE Proceedings. Part A >Degradation of cellulosic insulation in power transformers. Part 3: effects of oxygen and water on ageing in oil
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Degradation of cellulosic insulation in power transformers. Part 3: effects of oxygen and water on ageing in oil

机译：电力变压器中纤维素绝缘的降解。第3部分：氧气和水对油中老化的影响

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摘要

Heat, water and oxygen accelerate the degradation of cellulose insulation in electrical transformers. Their effects on insulation have been studied over a number of years using degree of polymerisation (DP) of the paper as a measure of ageing. Results are reported of a systemic study to measure the relative effectiveness of each component individually and in combination, on ageing in oil in a three-parameter two-level, partial factorial experiment. Ageing was measured in terms of change of degree of polymerisation of the paper and analysed according to recently developed models. In addition, the concentrations of furfural-based degradation products in the oil were measured. Water and temperature are most effective in accelerating ageing, with oxygen about one-third as efficient. There is a strong synergistic effect between temperature and water, a weaker synergism between temperature and oxygen, but, importantly, an apparent antagonistic effect between water and oxygen, at low water levels. If correct, the antagonism implies that the effectiveness of water, as an accelerator of ageing, decreases with increasing levels of oxygen in the oil at low water levels, which could explain why the insulation in scrapped transformers is sometimes found to be in very good condition.
机译：热量，水和氧气会加速变压器中纤维素绝缘的降解。多年来，已经使用纸的聚合度（DP）作为老化的量度研究了它们对绝缘的影响。一项系统研究报告了结果，该研究通过三参数，两级，部分析因试验分别测量和组合测量每种成分对油品老化的相对有效性。根据纸的聚合度的变化来测量老化，并根据最近开发的模型进行分析。另外，测量了油中基于糠醛的降解产物的浓度。水和温度对加速衰老最有效，而氧气的效率约为后者的三分之一。温度和水之间有很强的协同作用，温度和氧气之间有较弱的协同作用，但重要的是，在低水位下水和氧气之间有明显的拮抗作用。如果正确的话，这种拮抗作用就意味着作为老化促进剂的水的有效性在低水位下会随着油中氧气含量的增加而降低，这可以解释为什么有时发现报废变压器中的绝缘状况非常好。

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