基于弛豫电量的变压器油纸绝缘老化评估

发布时间：2018-07-05 07:34

本文选题：回复电压 + 驰豫响应　；参考：《仪器仪表学报》2017年05期

【摘要】：回复电压法是一种研究电力变压器绝缘老化状态的无损检测方法。回复电压含有丰富的反映绝缘状态的介电弛豫响应信息,为充分发挥回复电压法诊断油纸绝缘老化的优点,提出了利用驰豫电量评估变压器绝缘老化状态的新方法,并给出了相对驰豫电量与变压器油中糠醛含量的定量关系。首先,对回复电压曲线进行微分解谱求解回复电压的驰豫响应函数;其次,利用驰豫电量与驰豫响应函数的关系,计算出回复电压测量过程中的相对驰豫电量;最后,分析了相对驰豫电量与绝缘老化状态的关系。分析结果表明,驰豫电量对变压器油纸绝缘的老化非常敏感,相对驰豫电量Q_(1000)和Q_(500)与变压器油中糠醛含量存在较好的线性关系,相对驰豫电量可用于变压器油纸绝缘老化的定量评估。
[Abstract]:The reverse-voltage method is a nondestructive testing method to study the insulation aging state of power transformers. In order to give full play to the advantages of the recovery voltage method in diagnosing the ageing of oil-paper insulation, a new method for evaluating the insulation aging state of transformers by using the relaxation energy is proposed, in order to give full play to the abundant information of dielectric relaxation response information reflecting the insulation state of the transformer. The quantitative relationship between relative relaxation quantity and furfural content in transformer oil is given. Firstly, the relaxation response function of the recovery voltage is solved by using the micro-decomposition spectrum of the recovery voltage curve. Secondly, the relative relaxation response function of the recovery voltage is calculated by using the relationship between the relaxation quantity and the relaxation response function. Finally, the relative relaxation energy in the measurement of the recovery voltage is calculated. The relationship between relative relaxation quantity and aging state of insulation is analyzed. The results show that the relaxation quantity is very sensitive to the aging of transformer oil paper insulation, and the relative relaxation quantity Q _ (1000) and Q _ (500) have a good linear relationship with the furfural content in transformer oil. The relative relaxation quantity can be used for quantitative evaluation of transformer oil paper insulation aging.
【作者单位】：福州大学电气工程与自动化学院;国网福建省电力有限公司物资分公司;
【基金】：国家自然科学基金(61174117)项目资助
【分类号】：TM855

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