China Indoor Sf6 Circuit Breaker

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FGB -12/24/40.5 series indoor type SF6 circuit breaker, its used for controlling

and protecting transmission and distribution systems of power plants and

transformer substation, electric equipment and electric line, especially in the case

of frequently operating position, it not only use in new transformer substation

construction, but also suit free oil reconstruction of old transformer substation.

Adopt compact design schema with light & small volume;

High reliable type spring mechanism;

Provide a high table and advanced grade products;

Achieve free maintenance,long life requirement;

a widely available gas sealed pressure system

Like all gases in current use, SF6 is available in all countries of the world.SF6 is

non-toxic.All Merlin Gerin switchgear is of the sealed pressure system type in

accordance with the IEC 56 definition (appendix EE).Enclosures are filled to a

low relative pressure of 0.05 to 0.35 MPa (0.5 to 3.5 bars).

a non-inflammable gas

SF6 is an inert gas and does not sustain combustio n. The seal and the for-life

lubrication of the rotary seals is provided by an oil film.In the MV circuit breaker

field, for example,on more than 20 000 SF6 switchgear units installed by the

French electrical utility (EDF), the annual fault rate related to seal problems is

less than 0.05 %

A very stable gas

The high stability of SF6 gas is due to the 6 covalent bonds of its molecule.

an insulating gas

The dielectric strength of SF6 is superior to that of most know n media, reaching

5 times that of air at a pressure of a few tenths of Mpa.

a breaking gas

SF6 is "the" breaking gas offering a number of advantages:high capacity for

arrying the hea t produ ced by th e arc. The arc is rapidly cooled by convection

during arcing; high radial thermal conduction and high electron capturing capacit

y;when the current passes through zero:5 the SF6 permits rapid heat exchange

from the cent re of the a rc towa rds the exterior,5 the fluorine atoms, which are

highly electro-negative, act as veritable "traps" for electrons; since it is the

electrons which are mainly responsible for electric conduction in the gas, the gap

between the contacts recovers its initial dielectric strength through this electron

capture phenomenon at current zero.

very low maintenance

The electrical contacts, housed in a sealedfor-life enclosure,require no

specialmaintenance.The operating mechanism requires only minimum

maintenance at intervals depending on the conditions of use.Under normal

operating conditions, no

preventive maintenance is required before 10 000 operations or 10 years of

service
ContactZhejiang Farady Electric Co.,LtdTEL:0086-577-61722510/61777258Fax:0086-577-61777257
Http://www.farady.cn
Add:Xiangyang Industrial Zone,Liushi,Yueqing,Zhejiang,P.R.China, 325604