Abstract
In recent years, many scholars have carried out studies on c-C4F8 and its gas mixture and found it has potential to be used as an environment-friendly insulating medium to replace SF6 in medium-voltage equipment. In this paper, the c-C4F8 and c-C4F8/N2 gas mixture models were built to study its decomposition process by the combination of reactive molecular dynamics method and density functional theory. The yield of the main decomposition products, the reaction pathways and enthalpy under different temperatures were explored. It was found that the decomposition of c-C4F8/N2 mainly produces CF2, F, CF3, CF, C, CF4 and C2F4. c-C4F8 can decompose to C2F4 by absorbing 43.28 kcal/mol, which is the main decomposition path and this process easily occurs under high temperature. There is a dynamic equilibrium process among the various produced radicals, which ensures the insulation performance of system to a certain extent. The decomposition performance of c-C4F8/N2 mixture is better than that of pure c-C4F8 at the same temperature. Relevant results provide guidance for engineering application of the c-C4F8/N2 gas mixture.
Highlights
Nowadays, electrical equipment using SF6 as the insulation medium occupies a dominant position in the field of medium-voltage (MV) and high-voltage (HV) application
It was found that the decomposition of c-C4F8/N2 mainly produces CF2, F, CF3, CF, C, CF4 and C2F4. c-C4F8 can decompose to C2F4 by absorbing 43.28 kcal/mol, which is the main decomposition path and this process occurs under high temperature
We carried out the reactive molecular dynamics simulations of c-C4F8 and c-C4F8/N2 system at different temperature conditions to explore its decomposition mechanism
Summary
Electrical equipment using SF6 as the insulation medium occupies a dominant position in the field of medium-voltage (MV) and high-voltage (HV) application. Over the past 5 years, the global atmospheric content of SF6 has increased by 2 20% and its atmospheric mole fraction reaches to 7.28 ppq (part(s) per quadrillion) currently corresponding to a radiative forcing of 0.0041 W m22 [2,3]. SF4, SO2F2, SO2, SOF2 and other products produced by the decomposition of SF6 under long-term operating conditions are toxic substances, which pose a threat to equipment maintenance personnel [4]. With the increasing demand in environmental protection around the world, the carbon emission of power industry has been strictly limited. It is urgent to seek for an environmentally friendly gas as insulation medium for power industry
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