The SF

6

micro water

micro oxygen and solid insulating materials in the interrupter of SF

6

circuit breaker will decompose and generate new component gas under the action of arc. For studying the variation of decomposition product content after the current interruption during the full electrical life cycle of SF

6

circuit breaker

a whole life simulation ablation test platform of the circuit breaker is set up. 69 times of ablation tests are carried out on the circuit breaker

the voltage and current parameters as well as the decomposition contents of each gas during the ablation period are measured. The results show that SOF

2

CF

4

and SO

2

are the main products

the contents of SO

2

F

2

and SOF

4

are low and the H

2

S can not be detected stably. The contents of SOF

2

CF

4

SO

2

and SO

2

F

2

increase with the increase of the number of ablations. Among the main decomposition products

the production of SOF

2

and SO

2

has a linear relationship with arc energy

while there is no obvious rule between the production of CF

4

and arc energy

which may be due to the randomness of arc to the ablation of solid insulating materials. The adsorption of adsorbent to SOF

2

and SOF

4

is significant

but the adsorption of other products is not obvious. Finally

the method of assessing the residual electrical life of circuit breaker by way of SO

2

volume fraction is proposed.