Gas Pressure - ABB SafeRing 36 Installation And Operating Instructions Manual

4.4 GAS PRESSURE

SafeRing / SafePlus contain SF
of 1,4 bar at 20 o C.
SafeRing / SafePlus are «sealed for life» and is fitted with a
temperature-compensated pressure indicator.
Pointer in green area - unit has correct pressure.
Pointer in red area - pressure is too low.
A temperature-compensated device emitting an electrical sig-
nal to indicate low gas pressure can be supplied on request
Topping up of SF gas in SafeRing/SafePlus
6
Potensial risk!
Operators must be trained and qualified for SF
handling
Following equipment is needed: SF
meter and reduction valve, bottle for recovery of SF
ture, adapter and pressure measuring device. It is important
that the pressure measuring device shows absolute pressure.
If you have a pressure measuring device showing over-
pressure, please contact ABB for instructions (NHP 408025).
1. Remove the front cover and unscrew the pressure indicator
by unscrewing the hexagon nut as shown on the figure at
the right.
2. Screw the adapter to the valve. The tightening torque is
max 45 Nm.
3. Before connecting the hose from the gas bottle to the
adapter, the air in the hose must be removed by running
SF gas through the hose. The SF
6
4. When gas is flowing into the RMU/switchgear, the mano-
meter on the gas bottle has to be observed. When it shows
0,4 bar at ambient temperature 20° Celsius, (1,4 bar ab-
solute) the gas filling must be stopped. See table for filling
pressure below.
1,45
1,4
1,35
1,3
1,25
1,2
1,15
1,1
1,05
1
14 SafeRing/SafePlus 36kV | Installation and operating instruction
gas with a nominal pressure
6
gas
6
gas bottle with mano-
6
/air mix-
6
gas must be recovered.
6
Altitude
Green area
Red area
SF Air
6
Note! Screw/unscrew on this hexagonal
nut only. The pressure indicator can be
Spring-loaded
dismounted from the switchgear with-
valve
out SF
5. Remove the filling hose and connect the pressure device to
check the pressure inside the RMU/switchgear.
6. When the correct pressure of 0,4 bar (1,4 bar absolute)
is obtained, remove the adapter, check that the sealing
between the pressure indicator and the valve is smooth
and clean, and screw the pressure indicator to the RMU/
switchgear with tightening torque max 45 Nm as shown
above.
leakage from the SF tank
6 6
SF -gas temp Absolute filling
6
pressure
o
C
0
5
10
15
20
25
o
30
30
35
o
20
40
o
10
mbar
1305
1328
1352
1376
1400
1424
1448
1472
1496