基于弛豫电量的变压器油纸绝缘老化评估
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1.福州大学电气工程与自动化学院福州350108; 2.国网福建省电力有限公司物资分公司福州350003

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TH183TM411

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国家自然科学基金(61174117)项目资助


Aging evaluation of transformer oilpaper insulation based on quantity of relaxation charge
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1. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China; 2. Materials Branch, State Grid Fujian Electric Power Company Ltd., Fuzhou 350003, China

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    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Q1000和Q500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:

    Return voltage method is a nondestructive testing technique for studying the insulation aging state of power transformer. The return voltage contains abundant information about dielectric relaxation response reflecting the insulation aging status of transformer. In order to give full play to the advantages of return voltage method in diagnosing transformer oil paper insulation aging, a new method is proposed, which evaluates the insulation aging state of transformer using the quantity of relaxation charge. The quantitative relationship between the relative quantity of relaxation charge and the furfural content in the transformer oil is given. First of all, the return voltage curve is processed with the timedifferential unfolding and the relaxation response function of the return voltage is solved. Secondly, the relative quantity of relaxation charge in the measurement process of return voltage is calculated using the relationship between the quantity of relaxation charge and the relaxation response function. Finally, the relationship between the relative quantity of relaxation charge and insulation aging state is analyzed. Analysis results show that the quantity of relaxation charge is very sensitive to the aging of transformer oil paper insulation. There is a good linear relationship between furfural content and the relative quantities of relaxation charge Q1000 and Q500. The relative quantity of relaxation charge can be used for the quantitative evaluation of the aging of transformer oil paper insulation.

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贺德华,蔡金锭,蔡嘉.基于弛豫电量的变压器油纸绝缘老化评估[J].仪器仪表学报,2017,38(5):1079-1085

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  • 在线发布日期: 2017-07-10
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