一种基于未确知测度理论的油纸绝缘老化评估方法  

Assessment Method of Oil⁃paper Insulation Aging Based on Uncertain Measurement Theory

作　　者：舒恺 高飞翎 余萃卓 苏凯强 SHU Kai;GAO Feiling;YU Cuizhuo;SU Kaiqiang(Ningbo Electric Power Design Institute Co.,Zhejiang Ningbo 315000,China;College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350100,China)

机构地区：[1]宁波市电力设计院有限公司,浙江宁波315000 [2]福州大学电气工程与自动化学院,福州350100

出　　处：《高压电器》2022年第11期128-137,共10页High Voltage Apparatus

基　　金：国家自然科学基金资助项目(61174117,51977039)。

摘　　要：依据油纸绝缘时域介电响应介电谱及其能量谱,定义了两个能反映油纸绝缘老化程度的新特征量——去极化能量初始斜率S_(W)和去极化能量半衰期t_(half)。通过测试样本分析确定了S_(W)、t_(half)与油纸绝缘老化程度之间的关联性,验证了其作为绝缘老化指标在油纸绝缘老化评估中的有效性。针对复合油纸绝缘介电特征量,提出了一种新的未确知测度理论的绝缘老化特征指标综合评估体系。建立了绝缘老化评估结构层次与评价指标分级区间,在复合特征指标的权重分析基础上,引入未确知测度理论,针对其中等级评定环节的主观性问题,提出一种非对称贴近度改进的复合指标绝缘状态等级评估模型。最后,将新型的绝缘状态老化评估模型应用于介电响应试验样本,验证了非对称贴近度改进的未确知测度评估模型可以有效、合理地对变压器绝缘状态进行评估。Such two new characteristics reflecting insulation aging degree of oil paper as initial slope of depolariza⁃tion energy S_(w) and half life of depolarization energy t_(half) are defined in accordance with the time domain dielectric spectroscopy and energy spectrum of dielectric response on oil⁃paper insolation.The correlations among S_(w),t_(half) and insulation aging degree of oil paper is analyzed and defined by way of testing the sample,and the effectiveness of it in the oil insulation aging assessment as the insulation aging index is verified.As for the dielectric characteristic of composite oil paper insulation,a kind of new comprehensive assessment system of insulation aging characteristic in⁃dex based on uncertain measurement theory is proposed.The insulation aging assessment structure level and assess⁃ment index grading interval are set up and,on the basis of weight analysis of complex characteristic index,the un⁃certain measurement theory is introduced.As for the subjectivity of the assessment,a kind of composite index insu lation status grading assessment model improved by the asymmetric closeness degree is proposed.Finally⁃,the new insulation state aging assessment model is used in the dielectric response test sample,verifying that the uncertain measurement assessment mode improved by the asymmetric closeness degree can assess the insulation status of transformer effectively and reasonably.

关 键 词：介电特征量 绝缘老化 综合评估 未确知测度理论 

分 类 号：TM855[电气工程—高电压与绝缘技术]