1. Effects of ZnO magnetron sputtering on surface charge and flashover voltage of oil-impregnated paper
- Author
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Boxue Du, Jinpeng Jiang, Jin Li, and Wenbo Zhu
- Subjects
flashover ,paper ,zinc compounds ,ii-vi semiconductors ,surface charging ,attenuated total reflection ,surface morphology ,scanning electron microscopy ,infrared spectra ,wide band gap semiconductors ,sputter deposition ,surface potential ,carrier mobility ,impregnated insulation ,insulating oils ,surface conductivity ,tensile strength ,zno magnetron sputtering ,surface charge ,flashover voltage ,cellulose paper ,dry paper ,sputtered zno particles ,mechanical property ,sputtered samples ,volume conductivities ,oil-impregnated sputtered paper ,sputtered insulating paper ,surface potential decay ,dc flashover strength ,surface flashover strength ,flashover strength ,radiofrequency magnetron sputtering method ,structural modification ,converter transformers ,bonding mode ,cellulose matrix ,atr-ir spectroscopy ,charge dissipation characteristics ,trap distribution ,hydrogen bond ,chemical bond ,time 30.0 min ,time 0.0 min ,time 7.5 min ,time 15.0 min ,zno ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Electricity ,QC501-721 - Abstract
With the aim of exploring an alternative method of nano-doping in cellulose paper and improving flashover strength of oil-impregnated paper, radio frequency (RF) magnetron sputtering method is introduced into the structural modification of insulating paper for converter transformers. In this experiment, insulating paper was treated with ZnO sputtering for 0, 7.5, 15 and 30 min, respectively. The surface morphology of dry paper was observed with a scanning electron microscope. The bonding mode of sputtered ZnO particles with cellulose matrix was investigated via attenuated total reflection infrared (ATR-IR) spectroscopy and mechanical property of the sputtered samples were studied. Surface and volume conductivities of the oil-impregnated sputtered paper were measured. Moreover, the charge dissipation characteristics of sputtered insulating paper was investigated by means of surface potential decay. In addition, trap distribution and carrier mobility of specimen were further obtained. Finally, the DC flashover strength were tested. The results showed that ZnO magnetron sputtering had a distinct influence on the structure of the insulating paper, resulting in the formation of hydrogen bond and chemical bond and an increase of the surface and volume conductivities. ZnO sputtering was found to decrease the initial potential and accelerate charge decay. Moreover, appropriate sputtering enhanced the surface flashover strength.
- Published
- 2019
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