ABB SF6 LTB 245E1 BLG 1002A, Product Manual

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Overhaul Instructions Dismantling the circuit-breaker pole
1HSB435409-201 enrev1
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5.3 Removing the post insulator
Plan the work to remove the insulator so that it can be carried out quickly and
without long delays to prevent moisture in the air coming into lengthy contact with
the dust in the post and operating insulators.
N. B. Use personal safety equipment such as overalls, protective gloves and face
mask.
1. Position a lifting sling from the top of the post insulator to the crane or
overhead crane.
2. Remove the post insulator’s bolts (2) from the mechanism housing (3).
3. Lift the post insulator straight up until the operating insulator (7) moves freely.
Hold the operating insulator while lifting the post insulator.
N. B. Take care so as not to damage the operating insulator.
4. Remove the operating insulator (7) by removing the circlip (4), washer (5) and
pin (6).
5. Clean the operating insulator carefully and protect it using plastic sheet.
6. Clean the post insulator carefully, inside and outside, and protect it using
plastic sheet.
Figure 5-3. Removing the post insulator.
Item
1 Post insulator
2 Bolts M16x50
Washers 17x30x3
8 pcs.
8 pcs.
3 Mechanism housing
4 Circlip
5 Washer
6 Pin
7 Operating insulator
4
6
5
1
3
B10058
2
7