基于Debye模型分析变压器油纸绝缘频域介电谱特性研究

Analysis of Frequency Domain Dielectric Spectrum Properties of Transformer Oil Paper Insulation Based on Debye Model

变压器的油纸绝缘系统可等效为Debye电路模型来模拟其复杂极化过程。基于Debye模型等值电路参数与油纸绝缘的频域介电特征量的关系式,利用测量的频域介电特征量建立辨识Debye等值电路参数的优化模型,通过粒子群优化算法辨识出Debye电路模型中的参数值。利用辨识出的电路参数值计算油纸绝缘系统的介质损耗值,并与测量值比较,其绝对误差在8%以内。研究结果表明,提出的辨识电路参数的方法能有效用于分析油纸绝缘的极化特性,为利用频域介电谱诊断变压器油纸绝缘状态提供新的研究思路。

In order to analyze the complex polarization process of oil paper insulation system, the oil-paper insulation system of transformers can be simplified to Debye equivalent circuit model. On the basis of the relationship between the equivalent circuit parameters of Debye model and the frequency domain dielectric characteristic quantity of oil paper insulation, this paper utilized the measured frequency domain dielectric characteristic quantity to establish the optimization model to identify Debye equivalent circuit parameters and the parameters values of Debye model were identified by the particle swarm optimization algorithm. The dielectric loss of oil paper insulation system was calculated by the iden- tification of circuit parameters values. The absolute error was less than 8%. The research results show that the proposed identification parameters method could be effectively used to analyze the polarization characteristics of oil paper insulation, which provides the new research thought of using the frequency domain dielectric to diagnose oil paper insulation condition of transformers.