应用去极化能量谱评估变压器绝缘老化受潮状态  

Diagnosis of insulation condition of transformers by using depolarization energy spectrum

作　　者：黄云程[1] 蔡金锭[1] 

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108

出　　处：《电工电能新技术》2016年第1期53-59,共7页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金资助项目(61174117)

摘　　要：近年来,极化/去极化电流法(PDC)作为一种研究电力变压器绝缘老化状态的非破坏性检测方法得到了广泛的应用,但其中对于特征量的提取的研究还处在初步阶段。本文基于时域介电谱理论提取出去极化能量谱,从中提取峰值能量和主时间常数两个重要特征量。然后,利用扩展德拜模型等效电路建立仿真模型,研究两个特征量与老化受潮的关系,并分析能够反映绝缘内部结构的等效电路参数与谱线的内在联系。仿真结果表明,不同极化电压对特征量的提取不产生影响;随着绝缘老化受潮程度的增加,谱线往左上方移动,峰值能量和主时间常数能有效、直观和准确地评估变压器绝缘状态;等效电路参数变化与主时间常数、峰值能量具有鲜明的内在联系,可辅助评估变压器绝缘老化受潮状态。In recent years,the polarization / depolarization current method（ PDC） as a non-destructive testing method for power transformer insulation condition has been widely used,but the study of characteristics which are extracted from PDC is still in a preliminary stage. In this paper,the depolarization energy spectrum based on the time-domain dielectric spectroscopy theory was proposed,and the two important characteristics which are extracted from depolarization energy spectrum are peak energy and dominant time constant. Then,the extended Debye model equivalent circuit simulation model was built to study the relationship between the two characteristics with insulation condition,and the two characteristics were analyzed to find the intrinsic link with the equivalent circuit parameters which could reflect the internal structure of the insulation. The simulation results show that extraction of the characteristics is not affected under different polarization voltages. With the deterioration of the insulation condition,thedepolarizing line moves to the upper left,and the peak energy and the dominant time constant can effectively,intuitionally and accurately diagnose the insulation condition of transformer. The equivalent circuit parameters has a distinct intrinsic link with the dominant time constant and peak energy,and can be an aid in the assessment of insulation condition of transformers.

关 键 词：油纸绝缘 极化/去极化电流 时域 介电谱 特征量 

分 类 号：TM411[电气工程—电器]