ABB SGF, Instruction Manual

Page: 61 / 156

14 Mounting of Earthing Switch
Note :
If you suspect shipping damage, check the spacing dimensions of contact fingers (20)
Figure 69, Figure 70.
14.1 Earthing Switch Pole in Parallel
Note :
Make sure that the disconnector poles are in the OFF position before mounting the earthing
switches
Mounting steps
1. Grease clamps sleeves (433-353, 434-353) Figure 45 with silicone grease
2. Bring earthing-switch links (336) into mounting position by driving home the clamp sleeves on
sectional-steel base frame (221) : On the operating side on the operated disconnector pole
Figure 45, otherwise on the side of the tubular contact arm (23) Figure 46
3. Tighten earthing connections (79, 343) Figure 46, Caution : Use two earthing connections for
rated short-time currents > 40 kA, 1 sec
4. Tighten earthing-switch links (336)
5. Grease thrust bearing (330), inside and collared bush (331), outside, with silicone grease and
mount with collared bush (331), making sure that the thrust bearings are at the specificfed side
Figure 45
6. Mount earthing-switch shaft (337) Figure 45.
7. If pole distances P > 2 500 mm : Connect split earthing switch shaft to coupling piece (342)
Figure 47, Figure 48
8. Tighten locking screw in collard bushes (331) and secure with lock nut Figure 45
9. Set operating mechanism for earthing switch to the ON position
10. Set premounted operating lever (76) to the correct position Figure 51, Figure 52
11. Mount earthing-switch lever (19) on the earthing switch shaft Figure 49, Figure 50
12. Mount operating rod (71) Figure 49, Figure 50 and adjust to the required length
13. With the operating mechanism in the ON position, adjust spacing dimensions for operating lever
(76)
Figure 51, Figure 52
14. Tighten operating lever (76) and earthing-switch lever (19)
15. Treat contact surface for earthing contact (18) on the current path Figure 62, Figure 63
16. Treat earthing contact (18) and mount on current path (5) or (6). Caution : Do not lose insulating
bush (344) and insulating plate (345) Figure 62, Figure 63
17. Wipe contact finger (20) with cloth and grease Figure 46
18. Mount tubular contact arms (23) with T-type clamp (329) on earthing-switch shaft (337)
19. Set tubular contact arms (23) manually to the ON position untill contact fingers (20) are up
against stop (21)
Figure 64
20. Align contact finger (20) and earthing contact (18) at right angles to each other and tighten
earthing contact (18)
Figure 62 Figure 63
21. Preset distance "I" between rear contact finger (20) and stop (21) of earthing contact (18)
(compensation for torsion of earthing - switch shaft)
Figure 64
22. Tighten T-type clamps (329) on the earthing-switch shaft
23. Set earthing switch to the OFF position.
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