Alstom GL314 - Page 83

Installation
Calculation of th e SF
6
gas f illing pressure
for using the p ressure gauge (tool)
L31--901EN/02
3/6
08--2000
E ALSTOM
Calculation of the filling pressure at site
Measurement
Write down the result measurement into the corresponding box :
Measure the atmospheric pressure in MPa.
A ,
Measure the ambient temperature in °C.
B
Calculation of the
pure SF
6
gas filling
pressure
T ransfer the values into the corresponding box and write down the result :
With the help of the table (page 5) “Values of the SF6 gas
effective pressures
in accordance with the temperature”,
determine the value “p
re
“ in accordance with
the ambient temperature (B) "
p
re
C ,
Value of the reference atmospheric pressure in MPa
D0, 101
T ransfer the value of the local atmospheric pressure
(A) "
A
--
,
Calculate the difference of the atmospheric pressure
(D--A) "
E ,
T ransfer the value (C) "
C
+
,
Calculate the rated effective pressure
(E+C) "
F ,
The filling with SF
6
gas is carried out
to the calculated pressure, plus 0.01 MPa,
+ 0, 01
(F + 0.01) "
G ,