Relationship between the Electrical Characteristics of Molecules and Fast Streamers in Ester Insulation Oil

• DOI: 10.3390/ijms21030974
• Publication Date: 2020-02-03T16:28:31Z
• Authors: Kaizheng Wang; Feipeng Wang; Ziyi Lou; Qiuhuang Han; Qi Zhao; Kelin Hu; Zhengyong Huang; Jian Li
• Keywords: Trimethylolpropane; HOMO/LUMO

The effects of C=C, ester and β-H groups on the ionization potential (IP) electron affinity (EA) molecules in natural insulation oil were investigated by density functional theory (DFT). major contribution to highest occupied molecular orbital (HOMO) comes from carbon atoms adjacent C=C. Thus, IPs triglycerides decrease as number C=C double bonds increases. alkanes may also lower IP. However, has little effect IP, have only a small EAs because contributions near group lowest unoccupied (LUMO). This study calculated 53 kinds FR3, which are significantly compared with those mineral (MO) trimethylolpropane triester without lightning impulse breakdown voltage (LI Vb) is still than that MO at large gap. Therefore, transition slow fast streamers under low lighting determined rather β-H. attract more electrons, impacting itself alkane facilitating streamers.