Surface charge decay of epoxy resin treated by AP-DBD deposition and direct fluorination

2019 ◽  
Vol 26 (3) ◽  
pp. 768-775
Author(s):  
Cheng Zhang ◽  
Yiyang Ma ◽  
Fei Kong ◽  
Ruixue Wang ◽  
Chengyan Ren ◽  
...  
Keyword(s):  
Surface Charge ◽  
Epoxy Resin ◽  
Direct Fluorination ◽  
Charge Decay

Surface charge decay of epoxy resin treated by AP-DBD deposition and direct fluorination

2019 ◽  
Vol 26 (3) ◽  
pp. 768-775 ◽  
Author(s):  
Cheng Zhang ◽  
Yiyang Ma ◽  
Fei Kong ◽  
Ruixue Wang ◽  
Chengyan Ren ◽  
...  
Keyword(s):  
Surface Charge ◽  
Epoxy Resin ◽  
Direct Fluorination ◽  
Charge Decay

scholarly journals Suppression of surface charge accumulation on Al2O3-filled epoxy resin insulator under dc voltage by direct fluorination

AIP Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 127207 ◽  
Author(s):  
Boya Zhang ◽  
Guixin Zhang ◽  
Qiang Wang ◽  
Chuanyang Li ◽  
Jinliang He ◽  
...  
Keyword(s):  
Surface Charge ◽  
Epoxy Resin ◽  
Charge Accumulation ◽  
Dc Voltage ◽  
Direct Fluorination

scholarly journals Influence of surface charge decay on cavity PD frequency at DC voltage

2019 ◽  
Vol 13 (2) ◽  
pp. 193-200 ◽  
Author(s):  
Cheng Pan ◽  
Wenbin Song ◽  
Ju Tang ◽  
Yi Luo ◽  
Jia Yin
Keyword(s):  
Surface Charge ◽  
Dc Voltage ◽  
Charge Decay

Oil and Paper Insulation for DC Converter Transformer

2017 ◽  
pp. 194-231
Keyword(s):  
Surface Charge ◽  
Electric Fields ◽  
Power Flow ◽  
Heat Transfer Process ◽  
Transformer Oil ◽  
Polarity Reversal ◽  
Bulk Property ◽  
Hvdc System ◽  
Direct Fluorination ◽  
Paper Insulation

Transformer oil and oil-impregnated paper, serve as the essential parts of converter transformer, suffering various electric fields. The accumulation of surface charge on the paper would lead to flashover. When the power flow of the HVDC system is reversed, the charge field will easily lead to discharge. Direct-fluorination is a method which could affect the material property without alternating the bulk property. Besides, a new type of nano-modified transformer oil is a method to improve properties. This chapter presents a study of the effect of fluorination on surface charge behavior, the effect of polarity reversal voltages on interface charge behavior and the effect of Boron nitride (BN) nanoparticles on the high thermal conductivity of transformer oil. Results show that fluorination had an influence on the chemical property of the paper and BN nanoparticles has improvements in heat transfer process. In the polarity reversal test, the dissipation rate becomes smaller as the reversal time gets longer.

scholarly journals Molecular Structure Modulated Trap Distribution and Carrier Migration in Fluorinated Epoxy Resin

Molecules ◽  
2020 ◽  
Vol 25 (13) ◽  
pp. 3071 ◽  
Author(s):  
Jin Li ◽  
Yufan Wang ◽  
Zhaoyu Ran ◽  
Hang Yao ◽  
Boxue Du ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Surface Charge ◽  
Epoxy Resin ◽  
Mobility Model ◽  
Molecular Orbitals ◽  
Chemical Calculation ◽  
Dissipation Process ◽  
Highest Occupied Molecular Orbitals ◽  
Lowest Unoccupied Molecular Orbitals ◽  
Positively Charged

Surface charge accumulation on epoxy insulators is one of the most serious problems threatening the operation safety of the direct current gas-insulated transmission line (GIL), and can be efficiently inhibited by the surface modification technology. This paper investigated the mechanisms of fluorination modulated surface charge behaviors of epoxy resin through quantum chemical calculation (QCC) analysis of the molecular structure. The results show that after fluorination, the surface charge dissipation process of the epoxy sample is accelerated by the introduced shallow trap sites, which is further clarified by the carrier mobility model. The electron distribution probability of the highest occupied molecular orbitals (HOMO) under positive charging and the lowest unoccupied molecular orbitals (LUMO) under negative charging shows distinctive patterns. It is illustrated that electrons are likely to aggregate locally around benzenes for the positively charged molecular structure, while electrons tend to distribute all along the epoxy chain under negatively charging. The calculated results verify that fluorination can modulate surface charge behaviors of epoxy resin through redesigning its molecular structure, trap distribution and charging patterns.

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