油浸纸套管电容芯子浸渍不良缺陷的放电过程及其特征

发布时间：2018-12-18 20:09

【摘要】：为了研究油浸纸套管浸渍不良缺陷的劣化机理,研制了透明的套管模型,利用良好套管模型漏油后补油不抽真空的方法,模拟浸渍不良缺陷;利用阶梯升压法,研究浸渍不良套管缺陷模型的局部放电参数、介质损耗正切值和电容量的变化情况,同时观测了放电过程中的产气部位和产气现象,并结合试验后解剖,分析油浸纸电树枝碳化通道。研究结果表明,对于油浸纸套管浸渍不良缺陷劣化过程,局部放电检测比较灵敏、特征显著,而介质损耗正切值、电容量检测不灵敏。放电位于芯子末屏极板边缘,沿极板边缘纸层表面发生电树枝沿面爬电并产生连续的气泡。放电相位呈现明显的对称分布,放电相位与放电量的φ-q散点图呈现"翼状"分布特点,可作为诊断和识别油浸纸套管电容芯浸渍不良缺陷放电严重程度的特征谱图。
[Abstract]:In order to study the deterioration mechanism of poor impregnation defects in oil-impregnated paper casing, a transparent casing model was developed. The method of filling oil without pumping vacuum after oil leakage was used to simulate the poor impregnation defect. The variation of partial discharge parameters, dielectric loss tangent value and electric capacity of defective impregnated casing model were studied by stepped-boost method. The gas production position and gas production phenomenon during discharge were observed and dissected after test. The electrocarbonation channel of oil impregnated paper was analyzed. The results show that partial discharge (PD) detection is sensitive and characteristic for the deterioration process of poor defect of oil-impregnated paper casing, but dielectric loss tangent value and capacitance detection is not sensitive. The discharge is located at the edge of the electrode plate of the core screen, and the electric branch creeps along the surface of the paper layer along the edge of the electrode plate and produces continuous bubbles. The phase of discharge shows a symmetrical distribution, and the 蠁 -Q scattered plot of discharge phase and discharge quantity show the characteristics of "airfoil" distribution, which can be used as the characteristic spectrum for diagnosing and identifying the discharge severity of poor discharge defect in the capacitor core of oil-impregnated paper casing.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);华北电力大学高电压与电磁兼容北京市重点实验室;南方电网科学研究院有限责任公司;
【基金】：国家高技术研究发展计划(863计划)(2015AA050204) 中央高校基本科研业务费专项资金(2016XS03) 中国南方电网公司2014年科技项目(K-KY2014-002)资助
【分类号】：TM855

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