Effect of O-2 on partial discharge and decomposition characteristics of C5F10O/CO2/O-2 gas mixture

This paper investigates the effect of O-2 on the partial discharge (PD) and decomposition characteristics of C5F10O/CO2/O-2 gas mixture employed as an eco-friendly gas insulating medium. We found that the insulation performance of the C5F10O/CO2/O-2 gas mixture is less degraded as the content of O-2 is less than 4%. However, PDIV+ is significantly reduced, and the discharge repetition rate increases drastically when the O-2 content exceeds 4%. The PD decomposition products of C5F10O/CO2/O-2 mainly include CF4, C2F6, C3F8, C3F6, CF2O, C2F6O3, and C3F7H. The addition of 2% O-2 has a strong inhibitory effect on the generation of CF4, C2F6, C3F6, C3F8, CF2O, and C2F6O3. This work provides guidance for the application of the C5F10O/CO2/O-2 gas mixture. (c) 2022 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).