Double Pressure Dead Type SF6
This circuit breaker is the modification fo the
simple SF6 circuit breaker which is discuss in previous blog but how lets
see!!!
See the diagram shown above ,
In this
C.B(Circuit Breaker) the air (SF6) is circulated from the compressor to the
high pressure auxillary tank though a inlet that is provided as shown at a rate
of 14kg/m2 from which it is then passed
to the main SF6 tank axially & then
to the arc chamber where arc is formed .So when this SF6 gas passes from the
arc chamber it has a cooling effect on the arc by taking the heat of arc along
with itself & resulting in the quenching of arc .This is a fast process
of quenching the arc as the dielectric medium provided by the gas is more .This air is now
goes to low pressure tank through which it again goes to compressor through an outlet at a rate of 2kg/m2 .Now
the SF6 can again be re-circulated for
another arc extinguishing operation.
ADVANTAGES:-
This system requires less maintenance & is more self- dependent & is reliable too!!
Since whole the apparatus is closed there is very minor chances of corrosion of the apparatus . ALSO it can use the same amount of SF6 again & again for the arc extinguishing process thus reducing the cost of operation!!!
Next time I will talk on HRC FUSES & ITS
OPERATION during an arcing time!!!
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