Alstom FKG1X - Page 58

Descrip
tion
and
operatio
n
Pole operation of
circuit
-
-
breaker
(Interrupting principle)
G13
-
-0
01EN02
3/4
02--2011
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ion contained in
this document is indicative only. No
representati
on or
warrant
y is
given or should
be
relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is
provided without liabili
ty and
is subject to
change without notice. Reproduction, use or disclosure to
third parties, without express writt
en authority, is
strictly prohibited.
 GRID
Opening
Stage 1 :
Start of opening
Whe
n
tub
e
(1
2)
in
the
mo
vin
g
co
nta
ct
(1
1)
se
pa
ra
tes
fro
m
the
pe
rma
ne
nt
co
n-
tact (21), the current is routed via the arc contacts (17).
21
1
2
1
7
1
1
Stage 2 :
Thermal effect
When the contacts (17) separate, an arc appears, and the energy from this
arc causes a rise in the pressure in the thermal expansion chamber (Vt),
which is enclosed by the stem (24) of the fixed contact (23) and the isolating
nozzle (14).
Vt
23
1
7
2
4
14
Continued on next page.