ABB SF6 LTB 245E1 BLG 1002A - Page 54

Assembly Instructions Pressurising the poles
1HSB435410-2 enrev1 29
6. Connect the density monitor (3) to the coupling (4) or the equal union cross
(10). Open valve (5) or, alternatively valve (11). If the density monitor is
connected to coupling (4) then valve (11) should be closed. However, if the
density monitor is connected to the equal union cross (10) then valve (5) should
be closed.
7. Connect coupling (4) to the circuit-breaker’s gas valve (6).
8. Connect the gas-filled hose (7) to the coupling.
9. Connect the hose to the gas cylinder.
10. Go from the circuit-breaker to the protected area and let the gas flow until the
regulator switches off.
11. Wait until the gas temperature has reached the circuit-breaker temperature level
before reading off the gas pressure on the density monitor. Adjust the pressure
if necessary.
12. Dismantle the hose from the coupling on the circuit-breaker.
13. Close the valve to the density monitor.
14. Dismantle the coupling from the circuit-breaker.
15. Release the pressure on the density monitor by opening valve (5) or valve (11).
16. Dismantle the density monitor from the coupling and fit it on the circuit-
breaker.
17. Repeat from 4 through to 16 for poles B and C.
N.B. When reading off from the precision gauge, correct the filling pressure
depending on the temperature as set out in Table 6-1.
Table 6-1. Filling pressure.
Filling pressure in MPa (abs)
stated on the rating plate; 0.7
Filling pressure read off the gauge in
Temp. when
filling ˚C
MPa (abs) bar (abs)
MPa
(a. op.)
bar
(a. op.)
+40 0.75 7.5 0.65 6.5
+30 0.72 7.2 0.62 6.2
+20 0.70 7.0 0.60 6.0
+10 0.66 6.6 0.56 5.6
± 0 0.63 6.3 0.53 5.3
-10 0.61 6.1 0.51 5.1
-20 0.58 5.8 0.48 4.8