Assembling the circuit-breaker pole
Overhaul Instructions
28
1HSB435409-201 enrev1
5. When the pin is fitted, carefully lower the breaking unit on to the post insulator
and centre it. Tighten the breaking unit using the bolts (7) to a torque of 60 Nm.
6. Clean the sealing surface on the upper flange (8) and coat with grease ”G”.
Place the sealing ring on top of the upper flange.
7. Open the new absorption agent package and fit the agent into the absorption
agent container (10).
8. Fit the absorption agent container (10) and the cover (9) and tighten the bolts
(7) to a torque of 45 Nm.
N. B. Fit the cover immediately the absorption agent container has been fitted.
8.6 Filling gas
• Vacuum-pump down to 100 Pa and let pumping continue for at least one hour
after this pressure has been reached.
• Stop the vacuum pumping and fill the circuit-breaker with dry and pure
nitrogen to atmospheric pressure. Allow to stand for a few hours or overnight.
• Vacuum-pump again down to 100 Pa and fill with pure SF
6
gas to a pressure of
0.125 MPa (abs).
Store filling hoses so that they are not exposed to moisture or contamination. They
must not be used other than for their intended purpose.
TIGHTENING TORQUE
60 Nm
TIGHTENING TORQUE
45 Nm
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