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Experimental research on insulation properties of C6F12O/N2 and C6F12O/CO2 gas mixtures

Experimental research on insulation properties of C6F12O/N2 and C6F12O/CO2 gas mixtures

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This study investigates the insulation performance of the new environmental friendly insulation gas C6F12O mixed with N2 and CO2 under the AC frequency voltage under 0.10–0.30 MPa. Firstly, the mixing ratio of C6F12O in the mixed gas is discussed by the gas phase state equation. The breakdown voltage of C6F12O gas mixtures under quasi-uniform electric field and the initial voltage of partial discharge in the highly non-uniform field are measured by the experimental method, and the insulation characteristics of SF6 gas mixtures are compared. The self-recovery performance of the gas mixture is analysed as well. Experimental results show that the mixing ratio of C6F12O is lower than 7% under 0.10 MPa, such that the operation requirements of the equipment can be satisfied. The breakdown voltage of 3% C6F12O gas mixtures is the same as that of 10% SF6 gas mixtures. The partial discharge inception voltage of 6% C6F12O gas mixtures is close to that of 10% SF6 gas mixtures. After 100 times of breakdown, the breakdown voltage of C6F12O gas mixtures does not decrease. Compared with N2, the breakdown voltage of C6F12O mixed with CO2 shows a more dispersive trend.

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-gtd.2018.5474
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