• 文献标题:   Streamer evolution arrest governed amplified AC breakdown strength of graphene and CNT colloids
  • 文献类型:   Article
  • 作  者:   DHAR P, CHATTOPADHYAY A, MAGANTI LS, HARIKRISHNAN AR
  • 作者关键词:  
  • 出版物名称:   EUROPEAN PHYSICAL JOURNALAPPLIED PHYSICS
  • ISSN:   1286-0042 EI 1286-0050
  • 通讯作者地址:   Indian Inst Technol Ropar
  • 被引频次:   1
  • DOI:   10.1051/epjap/2019180360
  • 出版年:   2019

▎ 摘  要

The present paper explores the concept of improving the AC dielectric breakdown strength of insulating mineral oils by the addition of graphene or carbon nanotubes (CNTs) to form stable dispersions. Experimental observations of graphene and CNT nano-oils show that not only improved average breakdown voltage, but also significantly improved reliability and survival probabilities of the oils under AC high voltage stressing is achieved. Improvement of the tune of similar to 70-80% in the AC breakdown voltage of the oils has been obtained. The study examines the reliability of such nano-colloids using a two-parameter Weibull distribution and the oils show greatly augmented electric field bearing capacity. The fundamental mechanism responsible for such observed outcomes is reasoned to be delayed streamer development and reduced streamer growth rates due to effective electron scavenging. A mathematical model based on the principles of electron scavenging is proposed to quantify the amount of electrons scavenged by the nanostructures.