摘要
变压器油纸绝缘状态的准确诊断对其检修策略制定具有重要指导意义。为实现油纸绝缘状态的客观科学评价,建立基于组合赋权-双基点法的变压器油纸绝缘状态多特征量综合评估模型。首先,针对利用单一特征量评估的不足,基于现有采集的时域介电谱数据分别从回复电压极化谱与扩展德拜等效电路提取多个老化特征量,建立标准评估指标体系;其次,运用计及专家主观经验和数据客观差异的指标组合赋权模型,克服单一赋权法的不足;最后,基于双基点法计算待评估对象与标准状态理想点的贴近度,获取油纸绝缘状态的综合评估结果,并对评估结果数据进行深入分析,进一步了解变压器的油纸绝缘状态。通过实例验证所建评估模型能有效、准确地诊断变压器绝缘状态,可为变压器油纸绝缘状态评估提供一种新方法。
The accurate diagnosis of transformer oil-paper insulation state has important guiding significance for the formulation of maintenance strategy.In order to realize the objective scientific evaluation of the insulation state of oil-paper,a multi-feature comprehensive evaluation model of transformer oil-paper insulation state based on combined weighting-double base point method was established.Firstly,according to the shortcomings of the single feature quantity evaluation,based on the existing time-domain dielectric spectrum data,multiple aging feature quantities were extracted from the recovery voltage polarization spectrum and the extended Debye equivalent circuit respectively,and a standard evaluation index system was established.Secondly,to overcome the shortcomings of the single weighting method,the combination weighting model was used to take into account the subjective experience of experts and the objective differences of data.Finally,based on the double base point method,the closeness of the object was evaluated and the ideal point of the standard state were calculated,and the oil-paper insulation state was obtained.The case studies prove that the evaluation model built in this paper can effectively and accurately diagnose the insulation state of the transformer,which provides a new method for the evaluation of transformer oil-paper insulation state.
作者
邹阳
何倩玲
蔡金锭
Zou Yang;He Qianling;Cai Jinding(College of Electrical Engineering and Automation Fuzhou University,Fuzhou,350108,China;Fujian Smart Electrical Engineering Technology Research Center,Fuzhou,350108,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2019年第20期4400-4408,共9页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(61174117)
校科学发展基金(GXRC-18070)资助项目
关键词
油纸绝缘
组合赋权法
双基点法
状态综合评估
Oil-paper insulation
combined weight method
double base point method
com prehensive evaluation of state
