Alstom FKG1X - Page 86

Description and operation
SF
6
gas
monitor
ing
M20
-
-0
02EN03
7/10
02--2011
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 GRID
Example of the filling pressure calculation
Example
Determina
tion
of
the
circuit-
-breaker’s
filling
pressu
re
with
SF
6
gas.
P
a
r
a
m
e
t
e
r
s
V
a
l
u
e
s
p
re
SF
6
gas
rated effective
pressu
re
down to --25
°
C
0,7
5
MPa
Ambient temperature
5
°
C
Local atmospheric
pressu
re
93,
2
kPa
SF
6
gas filling
The
table
below
gives
the
calcula
tion
steps
of
the
pure
SF
6
filling
pressu
re
:
S
t
e
p
A
c
t
i
o
n
R
e
s
u
l
t
1
Inth
e
c
h
a
r
t
“
V
a
l
u
e
s
o
f
t
h
e
S
F
6
gas
effective pressures in
accorda
nce
wi
th
the
tem
pe
ra
tur
e”,
re
ad
the
p
re
value on the t
°
C = 5 row.
0,69
5
MPa
2
C
al
cu
la
te
th
e
di
ff
er
en
ceof
th
e
at
-
mosphe
ric pres
sure
:
0,1013 -- 0.0932
0,00
81
MPa
3
Ca
lcu
la
te
the
ra
ted
ef
fec
tiv
e
pr
es
-
sure
p
re
:
0,695 + 0.0081
0,70
31
MPa
4
Fi
ll
in
g i
s c
ar
ri
ed
ou
t to
th
e c
al
cu
-
la
ted
pr
es
su
re
,
pl
us
0.0
1
MPa
,
that is to sa
y
: 0,703
1 + 0.01
Pure SF
6
gas filling pressure
0,7131 MPa