Overhaul Instructions
Dismantling the breaking unit for transport
1HSB435409-201 enrev1 33
9. Fit the absorption agent container (12) and the cover (10) and tighten the bolts
(11) to a torque of 45 Nm.
Figure 9-2. Assembling the breaking unit.
10. Filling the circuit- breaker pole with gas.
a. Vacuum-pump down to 100 Pa and let pumping continue for at least one
hour after this pressure has been reached.
b. Stop the vacuum pumping and fill the circuit-breaker with dry and pure
nitrogen gas to atmospheric pressure. Allow it to stand for a few hours or
over-night.
c. 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.
Item
1 Pin
2 Washer
3 Circlip
4 Operating insulator
5 Bolt M12x 35
Washer 13x28x3
6 Breaking unit
7 Puffer pull-rod
8 Post insulator
9 Upper flange
10 Cover
11 Bolt M12x35
Washer 13x28x3
12 Absorption agent
container
TIGHTENING TORQUE
45 Nm
230-235
2
3
4
7
1
10
11
12
9
6
5
8
B10156
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