基于频谱二阶斜率方均根的变压器油浸绝缘纸频谱提取  

Frequency Spectroscopy Extraction of Oil-Immersed Paper Based on Second-Order Gradient Root Mean Square

作　　者：徐晴川 王圣康 林福昌[1,2] 李化 Xu Qingchuan;Wang Shengkang;Lin Fuchang;Li Hua(State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology,Wuhan 430074 China;Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology,Wuhan 430074 China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),武汉430074 [2]脉冲功率技术教育部重点实验室(华中科技大学),武汉430074

出　　处：《电工技术学报》2022年第19期4989-5002,共14页Transactions of China Electrotechnical Society

摘　　要：在变压器绝缘检测领域,用频域介电谱法对变压器绝缘状态进行评估,需要根据绝缘结构参数计算出油浸绝缘纸的频谱,然而待测变压器的绝缘结构往往是未知的,这极大地制约了频域介电谱法的现场应用。该文基于油浸绝缘纸频谱二阶斜率方均根,实现一种无需已知绝缘结构参数的变压器油浸绝缘纸频谱的提取方法。通过测量不同水分条件和绝缘结构的油纸绝缘样品的频域介电谱,根据绝缘结构参数计算油浸绝缘纸的频谱。研究发现,偏离实际值的绝缘结构参数会影响计算的油浸绝缘纸频谱的大小和形态,从而使得计算频谱的二阶斜率方均根显著增大。水分含量越高,影响越小。因此,通过遍历不同绝缘结构参数计算的油浸绝缘纸频谱,分析频谱二阶斜率方均根最小值对应的绝缘结构参数和油浸绝缘纸频谱,可以实现无需已知绝缘结构参数的变压器油浸绝缘纸频谱的提取。In the field of transformer insulation diagnostics, to evaluate the insulation condition of a transformer, it is necessary to calculate the frequency domain spectroscopy of the oil-immersed paper with the structural parameters. However, as the transformer structure is often unknown in on-site measurement,the application of the frequency domain spectroscopy(FDS) method is greatly limited. This paper proposed a method to extract the frequency spectroscopy of the oil-immersed paper without the known transformer structure based on second-order gradient RMS. The frequency spectroscopy of the constructed oil-paper insulation with different moisture conditions and structures were measured and the frequency spectroscopy of the oil-immersed paper was calculated according to the structural parameters. As the research shows,the structural parameters deviated from the actual value influence the shape and size of the calculated frequency spectroscopy curve of oil-immersed paper, which significantly increase the second-order gradient RMS. The influence is less with higher moisture content. By traversing the structural parameters in the calculation of frequency spectroscopy of the oil-immersed paper, the structural parameters and frequency spectroscopy is analyzed based on the minimum second-order gradient RMS. Therefore, the frequency spectroscopy of the oil-immersed paper is extracted without the known transformer structure.

关 键 词：变压器主绝缘 油纸绝缘系统 频域介电谱 油浸绝缘纸 

分 类 号：TM855[电气工程—高电压与绝缘技术]