Arc ablation and dielectric properties of PTFE Composite

which is used in nozzle of SF6 circuit breaker

are affected by various factors

including PTFE particle size

filler particle size

filler type

and addition of filler. The multi-factor trial is designed using orthogonal design software

and the law of dielectric properties of PTFE composite is studied as adding different filler

including Al2O3

BN

and MoS2. The results indicate that arc ablation performance can be greatly improved by introducing inorganic filler. When filler type is different

arc ablation quantity of compound PTFE containing MoS2 is bigger than that containing Al2O3

and that containing BN is the smallest

relative permittivity of compound PTFE is increasing with increment of filler

and decreasing as temperature rising

dielectric loss tangent is increasing as addition of filler and temperature rising. The experimental results of arc ablation are analyzed using orthogonal design software and show that arc ablation is influenced greatly by addition of filler

next by filler particle size

and thirdly by the interaction of filler particle size and PTFE particle size.