The polarization information contained in the frequency-domain spectroscopy (FDS) could be utilised for characterising the ageing degree of transformer oil-immersed insulation. However, the polarization information will be obscured by its conductance effect, it is thus hard to analyse the polarization behaviour by using the traditional FDS technique. Given this issue, an alternative approach is proposed to analyse the polarization information using FDS decoupled by logarithmic-derivative spectroscopy (LDS). Findings proved that the polarization loss information generated by polarization behaviour can be separated from the total dispersion loss. The proposed feature parameters are later used to analyse the polarization loss information under ageing impact. Also, the polarization loss surface is constructed by using these feature parameters to characterise the ageing degrees of oil-immersed samples. Finally, the potential possibility of using the proposed method to analyse the polarization loss and ageing degree are respectively discussed.

中文翻译：

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基于解耦频域光谱的变压器油浸式绝缘极化损耗分析及老化表征

频域光谱（FDS）中包含的极化信息可用于表征变压器油浸绝缘的老化程度。然而，极化信息会被其电导效应所掩盖，因此很难使用传统的FDS技术来分析极化行为。鉴于这个问题，提出了一种替代方法来分析使用通过对数微分光谱 (LDS) 解耦的 FDS 的偏振信息。研究结果证明，偏振行为产生的偏振损耗信息可以从总色散损耗中分离出来。所提出的特征参数随后用于分析老化影响下的极化损耗信息。还，利用这些特征参数构建极化损耗面来表征油浸样品的老化程度。最后，分别讨论了使用该方法分析极化损耗和老化程度的潜在可能性。