Assembling The Breaking Unit After An Overhaul - ABB SF6 LTB 245E1 BLG 1002A Product Manual

Dismantling the breaking unit for transport

9.1 Assembling the breaking unit after an overhaul

TIGHTENING TORQUE
60 Nm
32
6. Disconnect the breaking unit (6) by removing the circlip (3), washer (2) and
pin (1).
N. B. Ensure that neither the circlips nor washers fall into the post insulator
during dismantling. Cover the openings by, for example, tying a cloth over
them.
7. Fit the protective cover, ABB art No. 5439 142-A, with the sealing ring over
the post insulator (8). When the cover has been bolted in position, increase the
nitrogen pressure in the post insulator to 0.125 MPa (abs).
8. Slide the puffer pull-rod (7) into the breaking unit (6) and fit the protective
cover, ABB Art. No. 1HSB445237-1, with the sealing ring.
The breaking unit is now ready for transport.
If the post insulator or breaking unit is left in this condition for a long period
without the breaking unit being re-assembled, vacuum pump the post insulator or
breaking unit and fill with nitrogen gas,
1. Suspend the breaking unit, and remove the post insulator's protective cover,
ABB Art. No. 1HSB445237-1, and pull out the puffer so that its pull-rod (7) is
accessible for assembly.
2. Reduce the nitrogen pressure in the post insulator (8) to atmospheric pressure
and remove the protective cover.
3. Carefully clean the sealing surface of the sealing ring on the post insulator (8)
and coat with grease "G". Fit the sealing ring in its groove.
4. Slowly lower the breaking unit (6) so that it sits in position for fitting the pin,
approx. 60 - 70 mm above the post insulator.
5. Connect the puffer pull-rod (7) to the operating insulator (4) using the pin (1).
6. When the pin is fitted, lower the breaking unit (6) carefully down towards the
post insulator (8) and centre it. Bolt the breaking unit in position using the bolts
(5) and tighten to a torque of 60 Nm.
7. Clean the upper flange (9) and coat with grease "G". Place the sealing ring on
top of the upper flange.
8. Open the packaging of the new absorption agent and fit the agent into the
absorption agent container (12).
Overhaul Instructions
see Chapter 8.6.
1HSB435409-201 enrev1