Study on Arc Extinguishing Capability of HFO-1336mzz(E)/CO2 as SF6 Substitute Gas

SF6 gas is mostly used in medium and high voltage power equipment due to its great insulation and arc extinguishing performance. However, large amounts of SF6 gas can have a serious greenhouse effect. This article studies the arc extinguishing performance of HFO-1336mzz (E)/CO2 mixture to evaluate its feasibility as an environmentally friendly gas to replace SF6 in medium voltage switchgear. Based on the theory of local thermodynamic equilibrium, the physical parameters of HFO-1336mzz(E)/CO2 were calculated by Gibbs energy minimization method, which provided important data support for the basic input parameters of simulation for arc burning simulation. Two-dimensional magnetohydrodynamic simulation model was established, and the load current breaking process was simulated under the pneumatic load switch structure. The temperature field distribution in the arc extinguishing room of HFO-1336mzz(E)/CO2 and SF6 gas were compared during the arc burning process. The results provide a key reference for the application of HFO-1336mzz(E)/CO2 as arc extinguishing medium in medium voltage switchgear.