基于油中甲醇含量的变压器绝缘纸老化状况评估技术研究

Ageing Evaluation Technology of Transformer Insulating Paper Based on Methanol Content in Oil

通过对绝缘纸老化特征产物甲醇的检测分析,探究甲醇含量与绝缘纸聚合度之间的相关性,提出表征绝缘纸老化状况的油中甲醇含量的特征参考值。结果表明:绝缘纸聚合度的对数与甲醇含量之间存在良好的线性相关性,且在不同实验条件下,其线性关系均高度相似,可表示为lnDP=aC+b。针对不同电压等级变压器提出的表征绝缘纸老化状况的油中甲醇含量特征值,可对绝缘纸老化状况进行有效判断,从而诊断和评估变压器的运行状态。

The correlation between methanol content and polymerization degree of insulating paper was studied through the detection and analysis of ageing characteristic product methanol of insulating paper,and the characteristic parameter of methanol content in oil,which can characterize the ageing state of insulating paper,was put forward.The results show that there is a good linear correlation between the polymerization degree logarithm of insulating paper and the methanol content,and the linear correlations are highly similar under different experimental conditions,which can be expressed as lnDP=aC+b.The characteristic values of methanol content in oil proposed for transformers with different voltage levels can judge the ageing state of insulating paper effectively,and thus the operation status of transformer can be diagnosed and evaluated.