• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Investigation of dielectric properties of polyethylene terephthalate under different aging temperatures
【24h】

Investigation of dielectric properties of polyethylene terephthalate under different aging temperatures

机译：不同老化温度下聚对苯二甲酸乙二醇酯的介电性能研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The polyethylene terephthalate (PET) is widely used in dry-type insulation application because of its excellent insulation properties. In practice, thermal aging of PET is often encountered, but the related mechanisms and effect of thermal aging on the PET dielectric properties still remain unclear. In the present paper, we presented a systematic and comparative study on the effect of thermal aging on surface microscopic morphological characteristics, DC breakdown strength, trap depths and the apparent mobility. The results indicate that when aged at 130°C, the surface topography becomes coarser than that aged at 80°C. The polarity reversal at the PET/PET interface during the polarization indicates that the injection abilities of Al and Sc electrodes are gradually enhanced when aged at 80°C and 130°C, respectively. Moreover, the measured isothermal discharge currents during depolarization show that the trap depth corresponding to the maximum trap density increases significantly in the beginning of aging, and then it decreases gradually when aged at 80°C, but it increases evidently when aged at 130°C with increasing the aging degree. It also has been found that the apparent trap-controlled charge mobility is greatly enhanced when aged at 80°C with the increase in thermal aging degree. This enhancement is proved to be associated with the decrease in trap energy level at the PET/PET interface. Also, it can be preliminary concluded that the enhancement of DC breakdown strength (at 1500 h) is closely related to the increase in electron type trap energy and its density when aged at 130°C.
机译：聚对苯二甲酸乙二醇酯（PET）由于其优异的绝缘性能而广泛用于干式绝缘应用中。在实践中，经常会遇到PET的热老化，但是热老化对PET介电性能的相关机理和影响仍然不清楚。在本文中，我们对热老化对表面微观形貌特征，直流击穿强度，陷阱深度和表观迁移率的影响进行了系统的比较研究。结果表明，在130℃时效时，表面形貌比在80℃时效时更粗糙。极化期间PET / PET界面的极性反转表明，分别在80°C和130°C时效时，Al和Sc电极的注入能力逐渐增强。此外，在去极化过程中测得的等温放电电流表明，对应于最大陷阱密度的陷阱深度在时效开始时显着增加，然后在80°C时效时逐渐减小，而在130°C时效则明显增加。随着老化程度的增加。还已经发现，当在80℃下老化时，随着热老化程度的增加，表观陷阱控制的电荷迁移率大大提高。事实证明，这种增强与PET / PET界面处陷阱能级的降低有关。此外，可以初步得出结论：在130°C时效时，直流击穿强度（在1500 h时）的增强与电子型陷阱能及其密度的增加密切相关。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号