基于去极化电流子谱线的油纸绝缘老化评估  

Aging Condition Evaluation of Oil-Paper Insulation based on Depolarization Current Sub-lines

作　　者：吴文宣[1,2] 张孔林[3,2] 蔡金锭[2] 施广宇[3] 李安娜[2] 

机构地区：[1]国家电网福建省电力公司,福州350001 [2]福州大学电气工程与自动化学院,福州350108 [3]福建省电力有限公司电力科学研究院,福州350007

出　　处：《电气技术》2015年第6期25-28,72,共5页Electrical Engineering

摘　　要：去极化电流能够很好表征油纸绝缘系统介质响应过程。本文对去极化电流内部弛豫特性进行研究,引入子谱线和子谱线能量这两个新特征量,探讨子谱线能量与绝缘老化状况的关系,进而研究子谱线与油纸绝缘成分的对应关系,从而得到油纸绝缘老化的判别方法。研究结果表明子谱线能量对老化变化灵敏,它随绝缘水平的降低而显著增加;绝缘油的状态与小时间常数子谱线相关;绝缘纸的状态与大时间常数子谱线相关。因此,去极化电流子谱线及其能量可重点作为绝缘诊断的判据,其为准确评估油纸绝缘老化状态提供一种可靠有力的分析手段。Depolarization current analysis is a better method for reflecting characteristics of the polarization process of dielectric response. The inner relaxation characteristics of depolarization current are studied in this paper. Two new characteristic quantities including sub-lines and its energy are introduced so as to further analyze the relationship between sub-lines energy and aging condition of oil-paper insulation, and the correspondence between sub-lines and the compositions of oil-paper insulation. And then a method to distinguish aging condition of oil-paper insulation is derived. Results show that, the sensitivity of sub-lines energy is sensitive to aging condition, sub-lines energy increases with the lower insulation level .The state of insulating oil is closely related to sub-lines of small time constant. The state of insulating paper is closely related to sub-lines of big time constant. So, depolarization current sub-lines and its energy can be accepted as the criterion of insulation diagnosis. The research will be one of effective means in the assessment of oil-paper insulation aging status.

关 键 词：去极化电流 子谱线 子谱线能量 油纸绝缘 

分 类 号：TM855[电气工程—高电压与绝缘技术]