交直流复合电压下老化油纸绝缘针板模型局部放电特性

发布时间：2018-04-05 16:09

本文选题：换流变压器　切入点：油纸绝缘　出处：《高电压技术》2017年06期

【摘要】：为研究换流变压器阀侧实际运行老化的油纸绝缘局部放电特性,提高交直流复合电压下油纸绝缘局部放电研究的工程实际意义,取运行5 a的换流变油纸样本,建立典型针板电极油纸绝缘缺陷模型,对交直流复合电压下老化油纸绝缘局部放电从起始阶段到击穿的整个过程进行了实验模拟并记录放电时域信号。随着局部放电发展,放电幅值逐渐提高,出现放电的相位分布扩大,相应相位出现的放电次数增加,当临近击穿时,负周期放电量超正周期数倍。基于时域放电信号建立了多个放电周期的H_(umax)(φ)、H_(umean)(φ)、H_n(φ)和H_n(u)等PRPD谱图。分析谱图特性,并计算各个谱图的偏度(Sk)等统计参量因子,基于自适应阈值模糊聚类分析方法,将统计参量因子分为10类,分类之后可看出一定的时间延续性。结合分类结果和局部放电发展的不同时刻的信息,将放电模型的发展过程划分为初始放电阶段、放电发展阶段、放电稳定阶段和预击穿阶段。划分结果可为交直流复合电压下油纸绝缘局部放电在线监测和模式识别提供参考。
[Abstract]:In order to study the characteristics of partial discharge (PD) of oil-paper insulation on the valve side of converter transformer, and to improve the engineering significance of the study of oil-paper insulation partial discharge (PD) under AC / DC composite voltage, the rheological oil paper samples of 5 years operation were taken.A typical model of oil-paper insulation defect of needle electrode was established. The whole process of partial discharge of aging oil-paper insulation from initial stage to breakdown was simulated and the time domain signal of discharge was recorded under AC / DC composite voltage.With the development of partial discharge, the discharge amplitude increases gradually, the phase distribution of the discharge increases, and the discharge times of the corresponding phase increase. When the breakdown is near, the negative period discharge is several times more than the positive period.Based on the time domain discharge signals, the PRPD spectra of several discharge cycles are established.Based on the adaptive threshold fuzzy clustering analysis method, the statistical parameter factors are divided into 10 categories. After classification, a certain continuity of time can be found.Based on the classification results and the information of partial discharge development at different times, the development process of the discharge model is divided into the initial discharge stage, the discharge development stage, the discharge stabilization stage and the prebreakdown stage.The partition results can provide reference for on-line monitoring and pattern recognition of oil paper insulation partial discharge under AC / DC composite voltage.
【作者单位】：山东大学电气工程学院特高压输变电技术与装备山东省重点实验室;东北林业大学机电工程学院;国网山东省电力公司泰安供电公司;
【基金】：特高压工程技术(昆明,广州)国家工程实验室开放基金(NEL201513) 山东省科技发展计划(2014GGX104006)~~
【分类号】：TM855

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