变压器油纸绝缘状态的频域介电谱特征参量及评估方法

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Abstract In order to apply the technology of frequency-domain dielectric spectroscopy(FDS) to assess the aging condition of the main insulation of transformer more accurately, the method of distinguishing the influence of moisture content and aging product on the dielectric property of oil-paper insulation in frequency domain is investigated in this paper. FDS properties of oil-paper insulation with different moisture contents and aging degrees are measured in laboratory under controllable condition. The loss factors tanδ corresponding to different measurement frequency points are proposed as characteristics to distinguish the influences of moisture contents and aging degrees. The quantitative relationships between the characteristics and the moisture content or aging degree are initially proposed. The results show that in the range of 10^-3 to 10² Hz, tanδ increases with the increase of moisture content, while the aging degree only affects the value of tanδ in the range of 10^-3 to 10^-1Hz; An exponential rule is observed in the relation between the tanδ at different frequency points and moisture content as well as the degree of polymerization(K_DP) of the insulation paper. A preliminary validity of the proposed method is verified by applying it to a power transformer in service to evaluate the moisture content and K_DP of its main insulation paper.

Key words： Transformer oil-paper insulation frequency-domain dielectric spectroscopy(FDS) moisture content aging state condition assessment

Received: 23 August 2013 Published: 23 March 2015

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