基于去极化电流特征量的油纸绝缘变压器等效电路参数辨识

变压器扩展德拜等效电路是分析变压器绝缘老化情况的重要途径,针对变压器等效电路极化支路数及其参数求解难的问题,根据电介质极化响应理论,提出去极化电流时域微分解谱法,分解去极化电流曲线中各个子谱线组成部分,并根据子谱线参数判定等效电路极化支路数和辨识等效电路参数,为构建准确反映变压器油纸绝缘状态的等效电路提供可靠而简便的方法,并通过与其他辨识方法进行对比,验证文中方法的有效性,从而为准确评估变压器绝缘状态提供重要依据。

Parameter identification of oil-paper insulation transformer equivalent circuit based on depolarization current characteristics

Extended Debye equivalent circuit of transformer is an important way to analyze insulation aging of transformers. To address the problem of solving the number of polarization branches and the parameters of transformer equivalent circuit, this paper proposes the depolarization current time domain micro-decomposition spectrum method according to the theory of dielectric polarization response. This method first decomposes the components of each sub-line in the depolarization current curve to determine the number of polarization branches and then identifies the equivalent circuit parameters according to the parameters of the sub-spectral lines. Finally, the effectiveness of the proposed method is verified by comparing it with other identification methods. The proposed method provides a reliable and simple method for the construction of the equivalent circuit which accurately reflects the oil-paper insulation condition of transformer and further provides an important basis for the accurate evaluation of transformer insulation.