基于灰色关联与时-频域介电响应的油纸绝缘受潮状态快速评估方法  

Rapid evaluation method of oil-paper insulation damp condition based on grey correlation and time-frequency domain dielectric response

作　　者：姚欢民 穆海宝[1] 张大宁 马奎 刘垚 YAO Huanmin;MU Haibao;ZHANG Daning;MA Kui;LIU Yao(State Key Laboratory of Electrical Insulation and Power Equipment,Xi′an Jiaotong University,Xi′an 710049,China;State Grid Ningxia Power Supply Company,Yinchuan 750000,China)

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049 [2]国网宁夏电力有限公司,宁夏银川750000

出　　处：《绝缘材料》2023年第3期54-60,共7页Insulating Materials

基　　金：宁夏自然科学基金资助项目(2021AAC03503)。

摘　　要：受潮状态下油纸绝缘的等效扩展Debye模型不再具有线性特性,使得基于时频转换的油纸绝缘状态评估方法存在一定误差。本文综合时域与频域介电谱的优点,在获取时-频域介电响应参数的基础上使用灰色关联算法构建油纸绝缘受潮状态评估模型。首先制备不同含水量的油纸绝缘样品,分析了受潮和温度对极化去极化电流(polarization and depolarization current,PDC)以及频域介电谱(frequency domain spectroscopy,FDS)曲线的影响,进一步提取不同受潮状态下PDC和FDS曲线的特征参数。在此基础上,采用灰色关联算法整合油纸绝缘时频域介电特征量得到其规范化后的参考向量。最后,分别通过实验室样品数据和现场变压器数据验证了评估模型的准确性,为变压器早期故障预警与诊断提供了新方法。The equivalent extended Debye model of oil-paper insulation in the damp state no longer has linear characteristics, which makes the evaluation method of oil-paper insulation based on time-frequency conversion have errors.In this paper, the advantages of time domain and frequency domain dielectric spectroscopy were integrated, and the grey correlation algorithm was used to construct the evaluation model of oil-paper insulation damp condition on the basis of the time and frequency domain dielectric response parameters. Firstly, oil-paper insulation samples with different moisture content were prepared, and the influence of moisture and temperature on the polarization and depolarization current(PDC)and frequency domain spectroscopy(FDS) curves was analyzed. Furthermore, the characteristic parameters of PDC and FDS curves under different damp conditions were extracted. On this basis, the grey correlation algorithm was used to integrate the time and frequency domain dielectric characteristic parameters of oil-paper insulation to obtain its standardized reference vector. Finally, the accuracy of evaluation model was verified by laboratory sample data and field transformer data, which provides a new method for warning and diagnosis of transformer early fault.

关 键 词：油纸绝缘 时-频域转换 灰色关联 受潮和温度 故障诊断 

分 类 号：TM855[电气工程—高电压与绝缘技术]