Alstom GL314 - Description of the Interrupting Chamber

Description and operation
Description of the interrupting chamber
L12--103EN/02
1/2
08--2000
E ALSTOM
Presentatio n
Quenching medium
The quenching medium is pressurized SF
6
gas or -- in particular instances --
pressurized SF
6
+CF
4
gas mixture.
Interrupting principle
The interrupting chamber is of thermal blasting type, using the energy from
the arc, with an auxiliary autopneumatic effect.
Description
The interrupting chamber has been designed in such a way as to increase the
mechanical resistance of the working part and take advantage of the low wear
rate of the contacts subjected to the arc in SF
6
. The working part is enclosed
in a leak tight ceramic envelope, providing insulation between the circuit--
breaker input and output.
The chamber is made up of the following elements :
1
Mark Component
2
1 Terminal
2 Fixed contact support
3
11
3 Main contacts
3
1
2
4 Moving contact
12
6
5 Moving contact support
4
10
6 Envelope
4
13
10 Arcing contacts
5
11 Fixed contact rod
12 Insulating nozzle
13 Valve
1