Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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水分和温度对FDS低频介损的影响研究

来源:电工电气发布时间:2017-11-17 08:17 浏览次数:9
水分和温度对FDS低频介损的影响研究
 
张晓林1,任乔林2,张涛1,肖洒2
(1 三峡大学 电气与新能源学院,湖北 宜昌 443002;2 国网湖北省电力公司孝感供电公司,湖北 孝感 432100)
 
    摘 要:FDS方法能有效地评估水分和温度对变压器油纸绝缘系统的影响,尤其是低频介损更能有效反应其绝缘状态。在实验室完成试品的制备以模拟变压器油纸绝缘系统,试验研究了水分和温度对f=0.1 mHz的低频介质损耗tanδ 的影响,并通过最小二乘法分别将水分含量和测试温度与特征频率处的介质损耗tanδ进行拟合,得到相应的拟合关系。试验结果表明:低频f=0.1 mHz处的介质损耗tanδ随着水分和温度的上升呈指数函数增长,且其增长速率不断增大。该方法准确直观地评估了水分和温度对低频介损的影响,对准确诊断变压器油纸绝缘老化状态具有参考价值。
    关键词:变压器;油纸绝缘;水分;温度;频域介电谱;介质损耗;低频介损
    中图分类号:TM835.4     文献标识码:A     文章编号:1007-3175(2017)11-0048-04
 
Influence Study of Moisture and Temperature on Low Frequency Dielectric Loss of Frequency
Domain Dielectric Spectroscopy
 
ZHANG Xiao-lin1, REN Qiao-lin2, ZHANG Tao1, XIAO Sa2
(1 College of Electrical Engineering and New Energy, Three Gorges University, Yichang 443002, China;
2 Xiaogan Electric Power Supply Company of State Grid Hubei Electric Co., Ltd, Xiaogan 432100, China)
 
    Abstract: The frequency domain dielectric spectroscopy (FDS) method can effectively evaluate the influence of moisture and temperature on the oil paper insulation system of transformer, especially low-frequency dielectric loss, which can effectively reflect the insulation state. This paper studied on the influence of moisture and temperature on the low-frequency dielectric loss tanδ of f=0.1 mHz. The moisture content and the test temperature were fitted with the dielectric loss tanδ at the characteristic frequency by the least squares method respectively and the corresponding fitting relation was also obtained. The experimental results show that the dielectric loss tanδ at low frequency (f=0.1 mHz) increases with the increase of moisture content and test temperature, and its growth rate is also increasing. This method can not only evaluate the influence of moisture and temperature on the low frequency dielectric loss accurately and intuitively, but also provide some reference value for the diagnosis of the aging state of transformer oil paper insulation.
    Key words: transformer; oil paper insulation; moisture; temperature; frequency domain dielectric spectroscopy; dielectric loss; low frequency dielectric loss
 
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