In order to analyze the physical process between zero zone arc plasma and airflow intermolecular energy transport in the high voltage SF6 circuit breaker

and find the optimal control strategy of small current arc switching

the simulation analysis of arc characteristics on breaking zero zone is presented. The coupled field calculation physics of the breaking arc energy in the circuit breaker was established to calculate the spatial distribution of the zero zone arc plasma density and thermodynamic characteristics parameters. Using the comprehensive evaluation method of multiple physical state parameters

the effects of different breaking current

arcing time

breaking speed and other factors on the energy transport process betwe

en zero zone arc and gas flow were analyzed

the variation law and parameter range of the zero zone arc plasma physical properties were obtained. The calculation results show that there is a significant convection effect between the airflow and the arc. When the insulation break point with a temperature less than 4 000 K

a density greater than 3 kg/m

3

enthalpy value less than 1.6×107 J/kg

and a conductivity less than 800 S/m

the arc extinguishes.The research results can provide important theoretical basis for the design of the arc-extinguishing chamber of the high-voltage SF

6

circuit breaker

the selection of the mechanical characteristics of the operation

and the physical characteristics of the arc-extinguishing process.