方波脉冲电压下聚酰亚胺材料的老化特性

发布时间：2018-02-04 20:17

  本文关键词： 方波脉冲电压 聚酰亚胺材料 老化特性 介质损耗 局部放电 纳米粒子　出处：《高电压技术》2014年07期 　论文类型：期刊论文

【摘要】：为研究变频电机的匝间绝缘特性,在方波脉冲电压下,采用电热联合法对100HN绞线对和100CR绞线对进行老化试验,测试了各老化阶段其介质损耗特性和局部放电(PD)参量。试验结果表明:随着老化时间的增加,2种绞线对的介质损耗都增大,且局部放电的平均放电量和放电次数也都随之增大。但由于100CR中的纳米粒子周围形成了大量含有浅陷阱的界面区域,这些区域对电荷的输运能力较强,因此同一老化条件下,与100CR绞线对相比,100HN绞线对的介质损耗较大,局部放电的放电次数较多,平均放电量较小。此外,纳米粒子的协同效应有助于保护聚酰亚胺基体,延长100CR绞线对的绝缘寿命。
[Abstract]:In order to study the inter-turn insulation characteristics of variable-frequency motor, the aging tests of 100HN and 100CR strands were carried out under square wave pulse voltage by electrothermal method. The dielectric loss characteristics and PD parameters of each aging stage are measured. The results show that the dielectric loss of the two pairs increases with the aging time increasing. The average discharge amount and discharge frequency of partial discharge also increased, but because a large number of interface areas with shallow traps formed around the nanoparticles in 100CR, these areas have strong transport ability to charge. Therefore, under the same aging condition, compared with 100CR strand pair, the dielectric loss of 100HN pair is larger, the discharge frequency of partial discharge is more, and the average discharge quantity is smaller than that of 100CR strand pair. The synergistic effect of the nanoparticles helps to protect the polyimide matrix and prolong the insulation life of the 100CR strand pair.
【作者单位】： 西南交通大学电气工程学院;
【基金】：国家自然科学基金(51177136)~~
【分类号】：TM306
【正文快照】： 0引言1变频调速牵引电机是高速列车的动力设备,在其投运初期可能会由于绝缘系统所承受的非常恶劣的电气环境而使得绝缘过早失效。大量研究表明,局部放电(partial discharge,PD)对有机绝缘材料造成的不可逆变的化学和物理破坏是导致变频调速牵引电机绝缘早期失效的主要原因[1-5，

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