Overhaul Instructions
Dismantling the breaking unit for transport
1HSB435409-201 enrev1 31
9. Dismantling the breaking unit for transport
Dismantling of just the breaking unit for an overhaul may only be carried out in good
and settled weather conditions and if the relative humidity does not exceed 80%.
1. Take the circuit-breaker out of service.
2. Empty the gas, see Chapter 4.2.1. Fill with nitrogen to atmospheric pressure.
3. Operate the circuit-breaker slowly towards the closed position by cranking the
operating mechanism by hand. This is described in the Product information for
the operating mechanism. Stop cranking when the dimension 250 mm is
reached, see Figure 9-1. The coupling link with pin (1) on the operating
insulator (4) is now in the correct position for dismantling.
4. Place a lifting sling around the top section of the breaking unit and prepare to
lift it.
5. Remove the bolts (5) and very carefully lift the breaking unit (6) a maximum of
70 mm.
N. B. Do not lift the
breaking unit more
than 70 mm so as
not to damage the
circuit-breaker’s
internal
components.
If a large amount of moisture
should enter the post
insulator, fill it immediately
with nitrogen gas and
transport it to a workshop as
soon as possible for
dismantling and careful
cleaning.
Figure 9-1. Dismantling the breaking unit.
Item
1 Pin
2 Washer
3 Circlip
4 Operating insulator
5 Bolt M12x35
Washer 13x28x3
6 Breaking unit
7 Puffer pull-rod
8 Post insulator
B10155
2
1
3
4
5
6
230-235
8
7
To Next Page
Loading...
