Abstract
• Due to its excellent environmental-friendly properties and insulation properties, C 6 F 12 O has attracted the attention of scholars all over the world. • In order to ensure that gas-insulating medium can stably operate in equipment for long term, it is necessary to research its compatibility with the solid materials (metal, sealing rubber and et al) inside equipment. • The morphology of EPDM is revealed based on scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). • The interaction mechanism between EPDM and C 6 F 12 O is analyzed based on molecular dynamics (MD) theory. • Relevant results not only reveal the compatibility between C 6 F 12 O and EPDM, but also provide reference for the selection and manufacture of medium and low voltage switchgear materials. Due to its excellent insulation properties, the insulating medium C 6 F 12 O has been considered as a potential eco-friendly gas to use in medium and low voltage switchgear. To determine their long-term behavior, intensive investigations about the compatibility between C 6 F 12 O and sealing rubber materials used in electric equipment has been developed. The surface morphology and element changes of EPDM before and after the test are revealed based on scanning electron microscope and X-ray photoelectron spectroscopy. Meanwhile, the interaction mechanism between EPDM and C 6 F 12 O is simulated based on molecular dynamics theory. It is found that EPDM is incompatible with C 6 F 12 O after 280 days. There exist chemical reactions between EPDM and C 6 F 12 O, resulting in the precipitation of white crystal particles and the increase of F element from 0.480% (10 days) to 3.480% (280 days) on the surface of EPDM. Meanwhile, the calculation results show that the solubility parameter of SF 6 and C 6 F 12 O are 18.730 (J/cm 3 ) 1/2 and 13.454 (J/cm 3 ) 1/2 , which reveals that C 6 F 12 O is easier to dissolve with EPDM. The diffusion coefficient of C 6 F 12 O in EPDM (5.100 × 10 −7 cm 2 /s) and the interaction energy (42.703 kcal/mol) are also higher than those of SF 6 , which makes it easier for C 6 F 12 O to diffuse around and inside EPDM. These results can provide theoretical and technical reference for the material selection and design of C 6 F 12 O gas insulated equipment.
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