The 1 100 k V column filter circuit breaker

as the electric production of the new high voltage equipmentindustry

is an important control and protection equipment of UHV power grid

and the arc of the opening and clos-ing process will cause the erosion of the contact and the nozzle arc chamber. With the increase of the opening andclosing times

the erosion becomes increasingly serious

which leads to the decline of the breaking ability. An effec-tive way should be presented to assess the frequent switching operation’s impact for the working condition of the arcextinguish chamber. In this paper

the C2 test is car

ried out on the 1 100 k V column filter circuit breaker. By detect-ing the SF

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decomposition product

analyzing the chemical mechanism and examining the disintegration componentsof the equipment

a method is proposed that through detecting the content of CF

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to assess the influence of capacitivecurrent switching operation on working condition of the arc extinguish chamber. The method can be used for the main-tenance and repair of the other SF

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circuit breaker.