摘要
变压器油纸绝缘作为典型的复合电介质在老化过程中,其介电特性将发生显著的变化。本文为了研究油纸绝缘老化的介电响应特征量,设计了一套模拟变压器油纸绝缘老化的实验装置,研究了在加速电老化过程中,不同老化阶段的油纸绝缘的去极化电流,并利用傅立叶红外光谱分析了老化过程中油的化学组分的变化,作为对电老化程度的验证。研究结果表明,去极化电流的Debye等效电路模型能有效分析变压器油纸绝缘的老化状态,分析表明电路模型中最大和最小时间常数所对应的电阻R和电容C可作为老化特征量,其中最大时间常数所对应的Rmax、Cmax反应了绝缘油的老化情况,而最小时间常数对应的Rmin、Cmin反应了绝缘纸的老化情况。
Transformer oil-paper insulation is a typical composite dielectric. And its dielectric properties will change significantly during aging process. To investigate the characteristic parameters of dielectric response phenomena of transformer oil-paper insulation aging, a simulating device of the transformer oil-impregnated pressboard insulations was designed. Depolarization current of the samples during accelerated electrica! aging process at the same temperature was measured. And the infrared spectrum was used to prove that the oil-paper insulation has been aged. Based on Debye model, the resistance and capacitance of the maximum and minimum time constants branch are calculated. The results reveal that, the transformer condition can be obtained from Debye model. In Debye model the parameters Rmax and Cmax are related to aging condition of oil, and Rmin and Cmin, are related to aging condition of paper.
出处
《电工电能新技术》
CSCD
北大核心
2012年第4期39-42,47,共5页
Advanced Technology of Electrical Engineering and Energy
关键词
油纸绝缘
Debye模型
去极化电流
电老化
绝缘状态
界面极化
oil-paper insulation
Debye model
depolarization current
electrical ageing
insulation condition
interracial polarization
