Accelerated Charge Dissipation by Gas-Phase Fluorination on Nomex Paper
Source abstract
Abstract
The surface charge and space charge accumulation in paper used in oil–paper insulation system may distort electric field distribution and lead to the flashover and breakdown of insulation system. In this paper, the effect of gas-phase fluorination on the surface charge and space charge characteristics of oil-impregnated Nomex paper was investigated. Nomex T410 was fluorinated at 25 °C using F2/N2 mixtures with 20% F2 in volume at 0.05 MPa for 15, 30 and 45 min. Fourier Transform Infrared Spectroscopy (FTIR) proved that the molecular chain scission and cleavage occurred during gas-phase fluorination. Furthermore, the surface charge and space charge characteristic of the original and fluorinated oil-impregnated paper were measured using an electrostatic voltmeter and Pulsed Electroacoustic (PEA) equipment respectively. Furthermore, the hole and electron trap distribution of the samples were obtained by Isothermal Surface Potential Decay (ISPD) model. The results showed that both the positive and negative charge decay rates were accelerated by gas-phase fluorination and the hole, electron trap energy and density of the fluorinated samples were reduced by fluorination. It is suggested that the space charge dissipation was also accelerated by fluorination, indicating that gas-phase fluorination is an effective approach to modify the charge dynamics of oil-impregnated Nomex paper.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: High voltage insulation and dielectric phenomena · Power Transformer Diagnostics and Insulation · Aerosol Filtration and Electrostatic Precipitation
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Shanghai 200082, China
CISDI Information Technology CO., LTD., Chongqing 400013, China
Jinzhong Power Supply Company of State Grid Shanxi Electric Power Company, Shanxi 030001, China
Funding
the National Key R&D Program of China · the Opening Project of Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology
References (31)
Show source-provided references
1. Reliability assessment of insulation system for dry type transformers10.1109/TDEI.2013.6678847 ↗
2. Quantification of Kraft paper ageing in mineral oil impregnated insulation systems through mechanical characterization10.1007/s10570-018-1788-1 ↗
3. Kerr electro-optic field mapping study of the effect of charge injection on the impulse breakdown strength of transformer oil10.1063/1.4826185 ↗
4. Surface charge accumulation and decay on directfluorinated oil-impregnated paper10.1109/TDEI.2016.7736874 ↗
5. Space charge behavior in multi-layer oil-paper insulation under different DC voltages and temperatures10.1109/TDEI.2010.5492250 ↗
6. Influence of Moisture on Space Charge Dynamics in Multilayer Oil-Paper Insulation10.1109/TDEI.2012.6260023 ↗
7. Space charge behavior in the sample with two layers of oil-immersed-paper and oil10.1109/TDEI.2014.004241 ↗
8. Effects of paper-aged state on space charge characteristics in oil-impregnated paper insulation10.1109/TDEI.2012.6396942 ↗
9. Influence of Voltage Reversal on Space Charge Behavior in Oil-paper Insulation10.1109/TDEI.2013.004010 ↗
10. Dynamic behavior of surface charge on double-layer oil-paper insulation under pulse voltage10.1109/TDEI.2016.7736830 ↗
11. An application area of C 60: Overall improvement of insulating oil’s electrical performance10.1063/1.5026340 ↗
12. Influence of Monodisperse Fe3O4 Nanoparticle Size on Electrical Properties of Vegetable Oil-Based Nanofluids10.1155/2015/560352 ↗
13. Enhanced Electrical Insulation and Heat Transfer Performance of Vegetable Oil Based Nanofluids
14. Dielectric and Thermal Properties of Transformer Oil Modified by Semiconductive CdS Quantum Dots
15. Transformer oils-based graphene quantum dots nanofluid as a new generation of highly conductive and stable coolant10.1016/j.icheatmasstransfer.2017.03.011 ↗
16. Thermal stability and dielectric properties of nano-SiO2 doped cellulose10.1063/1.4990967 ↗
17. Fabrication of Al2O3 Nano-Structure Functional Film on a Cellulose Insulation Polymer Surface and Its Space Charge Suppression Effect10.3390/polym9100502 ↗
18. Surface fluorination of paper in CF4 -RF plasma environments10.1023/A:1020119109370 ↗
19. Surface modification of paper and cellulose by plasma-assisted deposition of fluorocarbon films10.1016/j.surfcoat.2004.10.013 ↗
20. Paper surface modification by plasma deposition of double layers of organic silicon compounds10.1039/b008050k ↗
21. Suppression effect of surface fluorination on charge injection into linear low density polyethylene10.1063/1.3080250 ↗
22. Significantly improved charge stability of cellular polypropylene films by fluorination and subsequent annealing10.1016/j.elstat.2010.07.003 ↗
23. Effect of surface fluorination on space charge behavior in multilayered polyimide films10.1109/TDEI.2014.004306 ↗
24. Suppression of surface charge accumulation on Al2O3-filled epoxy resin insulator under dc voltage by direct fluorination10.1063/1.4937626 ↗
25. Effects of direct fluorination on charge coupling behavior of oil-paper insulation under DC and pulse voltages10.1109/TDEI.2017.006287 ↗
26. Measurement of spatial charge distribution in thick dielectrics using the pulsed electroacoustic method10.1109/14.2384 ↗
27. Modification of nylon-6 with wholly rigid poly(m-phenylene isophthalamide)10.1002/app.1991.070430205 ↗
28. The Energy Distribution of Trapped Charges in Polymers Based on Isothermal Surface Potential Decay Model10.1109/TDEI.2015.7116370 ↗
29. Understanding the Conduction and Breakdown Properties of Polyethylene Nanodielectrics: Effect of deep traps10.1109/TDEI.2015.004823 ↗
30. Molecular modeling of electron traps in polymer insulators: Chemical defects and impurities10.1063/1.1385160 ↗
31. Significant suppression of space charge injection into linear low density polyethylene by surface oxyfluorination10.1063/1.3261847 ↗