In this paper

the influence of different ignition positions on the fire of high-voltage switchgear cabinet is studied on the basis of fluid dynamics calculation software

and the fire characteristic parameters of temperature field

dimensionless temperature factor

soot distribution and total heat release rate inside the cabinet are analyzed. The calculation results show that

in case of fire of handcart compartment

the maximum temperature is lower than that of the cable compartment or busbar compartment and

moreover

the dimensionless temperature of top or side wall at different fire positions has obvious difference

which can be used as the diagnosis means for the early fire safety warning. The distributions of soot and total heat release rate also show that

in case of fire in the cable compartment and handcart compartment

the soot can be filled fully in the complete high-voltage switchgear cabinet. While

in case of fire in the busbar compartment

the soot is only filled fully the busbar compartment. In addition

the fire of cable compartment has higher total the released rate and more heat is released due to the ignition of the combustible element of the adjacent handcart compartment. The research result in this paper can not only recognize and understand the development trend of fire spread of high-voltage switchgear cabinet

but also provide technical and theoretical support for the early safety warning of the high-voltage switchgear cabinet.