Alstom FKG1X - Page 87

Description and operation
SF
6
gas
monitor
ing
M20
-
-0
02EN03
8/10
02--2011
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 GRID
Calculation of the filling pressure at site
Measurement
Write
down
the
result
measure
ment
into
the
corresp
onding
box :
Measur
e the atmospheric pres
sure in
MPa.
A
,
Measure the ambient temperature in
°
C.
B
Calculation of the
pure SF
6
gas filling
pressure
Tran
sfer the values into the
corresp
onding box and write down the result
:
With the help of the table “Values of the SF
6
gas
effective pressures in accordance with the temperature”,
determine the value “
p
re
“ in accordance with
the ambient temperature (
B
)
"
p
re
C
,
V
alue of the reference atmospheric pres
sure in
MPa
D
0
,
1
0
1
Transfer the value of the local atmospheric pressure
(
A
)
"
A
-
-
,
Calculate the difference of the atmospheric pressure
(
D
-
-
A
)
"
E
,
Tr
ans
fer the va
lue
(
C
)
"
C
+
,
Calculate the rated effective pressure
(
E
+
C
)
"
F
,
The filling with SF
6
gas is carried out
to the calculated pr
essure
, plus 0.01
MPa,
+
0
,
0
1
(
F + 0,01
)
"
G
,