【作者】 窦鹏； 杨道武； 李毅； 龚杰；

【Author】 DOU Peng~(a,b) YANG Dao-wu~b LI Yi~a GONG Jie~a (a.College of Electrical and Information Engineering; b.College of Chemistry and Envionment Engineering.Changsha University of Science & Technology,Changsha 410076,China)

【机构】 长沙理工大学电气与信息工程学院； 长沙理工大学化学与环境工程学院；

【摘要】 采用红外光谱法分析变压器油在120℃恒温老化箱内的加速老化情况,依据1720cm^-1的醛基吸收峰与2720cm^-1C—H伸缩振动出现的特征吸收峰以及3400～3600cm^-1的烃基吸收峰变化,判定老化过程中有醛类和酸类化合物生成。通过混沌.分形理论分析了各老化阶段的油中局部放电脉冲波形,通过计算波形的关联维数D（m）和Kolmogorov熵（KE）,分析了波形的频谱和功率谱密度。结果表明,油质老化初期,关联维数呈下降趋势,放电信号的K熵值呈上升趋势,油中局放信号进入稳定期:随着老化加剧,关联维数迅速增大,局放波形的复杂性增强。运用混沌特性的变化来识别变压器油的老化状态效果明显,为变压器油的故障监测提供了新的诊断方法。更多还原

【Abstract】 This paper uses infrared spectroscopy analyze thermal aging of transformer oil,according to absorption peak of aldehyde at 1720cm^-1and the characteristic absorption peak at 2720 cm^-1which is caused by C-H stretching vibration and changes of absorption peak of alkyl from 3400 to 3600 cm^-1,judging that the aldehydes and the acids compound are produced in ageing process.The PD pulse waveform of ageing transformer oil is analyzed through Chaos-fractal theory,calculating the correlation dimension（D（m））and Kolmogorov Entropy（KE）and comparing the amplitude spectrum and Power Spectral Density（PSD）.The results show that the correlation dimension presents declining trend and Kolmogorov Entropy of discharge signal presents increasing trend during initial period of oil aging,the PD signal enters the stabilization period;Along with the aging of transformer oil,the correlation dimension increases rapidly and PD waveform becomes more complex.The chaos characteristic is used to identify condition of transformer oil presenting obvious effect,providing the new diagnosis method for the monitor of transformer oil.更多还原