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

Simulation Study on the Arc Extinguishing Performance of Eco-friendly HFO-1336mzz(E) Mixture Gas in a Load Switch

为了减少SF_(6)在电力设备中使用量,研究了环境友好型SF_(6)替代气体HFO-1336mzz(E)气体作为灭弧介质在12 kV负荷开关中的应用可行性,建立了2维磁流体动力学仿真模型,在压气式负荷开关结构下进行负荷电流开断过程仿真,对比了0.12 MPa下30%HFO-1336mzz(E)/CO_(2)、30%HFO-1336mzz(E)/干燥空气混合气体与0.1 MPa下SF_(6)气体燃弧过程中的电弧电压、灭弧室内温度场、气流场分布以及弧后热击穿特性。研究表明,HFO-1336mzz(E)混合气体熄弧尖峰略大于SF_(6),且电弧在轴向上扩散速率大于SF_(6)。电流快过零时,混合气体的电弧温度比SF_(6)低1400 K。通过弧后热击穿评估,30%HFO-1336mzz(E)/CO_(2)、30%HFO-1336mzz(E)/干燥空气混合气体的热开断能力分别可以达到SF_(6)的95%和96%。研究结果可为HFO-1336mzz(E)混合气体作为灭弧介质在中压开关设备中的应用提供参考。

In order to reduce the use of SF_(6) in power equipment,we investigated the application feasibility of eco-friendly SF_(6)-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)/CO_(2)(0.12 MPa),30%HFO-1336mzz(E)/air(0.1 MPa)and SF_(6)(0.1 MPa).The studies show that the arc quenching peak of HFO-1336mzz(E)gas mixtures is slightly greater than that of SF_(6),and the arc diffusion in the axial direction is greater than that of SF_(6).When the current nearly exceeds zero,the arc temperature of HFO-1336mzz(E)gas mixtures is 1400 K lower than that of SF_(6).By analysis,the thermal interruption capability of 30%HFO-1336mzz(E)/CO_(2) and 30%HFO-1336mzz(E)/air gas mixture can reach 95%and 96%that of SF_(6),respectively.The results can provide reference for HFO-1336mzz(E)gas mixtures as arc extinguishing medium in medium voltage switchgears.