Abstract：To investigate the synergetic impact of aging condition caused by mechanical-thermal effect on the frequency domain spectroscopy (FDS) of cellulose insulation paper within power transformer, a series of accelerated mechanical-thermal aging (MTA) experiments were performed in this work under conditions of 60℃, the amplitude and frequency were 0.26 mm and 100 Hz respectively, and the aging duration was 150 d. FDSs tests ranging from 1 mHz to 1 kHz were carried out and the microstructure and morphology were achieved. Based on the above tests, the variation regulation and mechanism of dissipation factor (tanδ) caused by mechanical-thermal aging were analyzed. Research results show that tanδ-f curves decrease with the increasing aging time overall, and the low frequency diffusion phenomenon is found, which are obvious different with those obtained under conditions of thermal aging. And the cause is studied from the aging and measurement conditions two aspects. Based on the microscopic structure analysis under MTA conditions, the influence of MTA on the microscopic structure of cellulose insulation paper is revealed, and the impacts of MTA on the oriented motion of both the free charge and the bound charge within the dielectric are illuminated, which the fundamental cause of tanδ-f curves decline with the increase of aging time can be understood. Meanwhile, mechanical- thermal aging lowered the volume conductivity and affected the polarization loss of the dielectric. The results of this paper can provide a reference for analyzing the mechanical-thermal aging effect on the insulating characteristics of the cellulose insulation paper.
李长云, 郝爱东. 机-热协同老化对纤维素绝缘纸频域介电谱特性的影响[J]. 电工技术学报, 2019, 34(17): 3705-3712.
Li Changyun, Hao Aidong. Influence of the Mechanical-Thermal Aging on the Frequency-Domain Dielectric Spectroscopy of Cellulose Insulation Paper. Transactions of China Electrotechnical Society, 2019, 34(17): 3705-3712.
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2019, Vol. 34 
