环境友好型 HFO-1336mzz(E)混合气体在负荷开关中的灭弧性能仿真研究

In order to reduce the use of SF6 in power equipment, we investigated the application feasibility of eco-friendly SF6-alternative gas HFO-1336mzz(E) as the arc extinguishing medium in a 12 kV load switch. We established a two-dimensional magnetohydrodynamic simulation model and calculated the current interruption process in the puffer-type load switch. Moreover, we studied and compared the arc voltage, temperature field, airflow field distribution in the arc extinguishing chamber during the arcing period and the thermal interruption capability during the post-arc period for the 30%HFO-1336mzz(E)/CO2 (0.12 MPa), 30%HFO-1336mzz(E)/air (0.1 MPa) and SF6 (0.1 MPa). The studies show that the arc quenching peak of HFO-1336mzz(E) gas mixtures is slightly greater than that of SF6, and the arc diffusion in the axial direction is greater than that of SF6. When the current nearly exceeds zero, the arc temperature of HFO-1336mzz(E) gas mixtures is 1400 K lower than that of SF6. By analysis, the thermal interruption capability of 30%HFO-1336mzz(E)/CO2 and 30%HFO-1336mzz(E)/air gas mixture can reach 95% and 96% that of SF6, respectively. The results can provide reference for HFO-1336mzz(E) gas mixtures as arc extinguishing medium in medium voltage switchgears.