ABB SGF, Instruction Manual

Page: 71 / 156

14.1 Earthing Switch Poles in Series and Mounting on Individual Disconnector Poles
Note :
Make sure that the disconnector poles are in the OFF position before mounting the earthing
switches
Mounting steps
1. Grease clamps sleeves (43 -353, 43 -353) Figure
2. Place earthing-switch links (336) or base frame of earthing switch (336a) into mounting position
by driving home the clamp sleeves on sectional steel base frame (221) Figure 53, Figure 54
3. Tighten earthing connections (79, 343) Figure 54, Caution : Use two earthing connections if
rated short-time currents > 40 kA, 1 sec
4. Tighten earthing-switch links (336) or base frame of earthing switch (336a)
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 specified side
Figure 53
6. Mount earthing-switch shafts (73) Figure 53, Figure 55, Figure 56
7. Tighten locking screw in collared bushes (331) and secure with lock nuts Figure 53
8. Set operating mechanism for earthing switch to the ON position
9. Adjust premounted operating lever (76) to the correct position Figure 60, figure 61
10. Mount earthing-switch lever (19) on the earthing - switch shaft Figure 58, Figure 59
11. Mount operating rod (71) and adjust to the required length Figure 60, figure 61
12. With the operating mechanism in the ON position, adjust spacing dimensions for operating lever
(76) Figure 60, figure 61
13. Tighten operating lever (76) and earthing-switch lever (19)
14. Set earthing - switch lever (339) to position Figure 56
15. Mount coupling rods (15), aligning earthing-switch lever (339) to the required measurement
Figure 55
16. Treat contact surface for earthing contact (18) on the current path Figure 62, Figure 63
17. 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
18. Wipe contact finger (20) with cloth and grease Figure 54
19. Mount tubular contact arms (23) with T-type clamp (329) on earthing-switch shafts (73)
Figure 54
20. Set tubular contact arms (23) manually to the ON position until contact fingers (20) are up
against stop (21) Figure 64
21. Align contact finger (20) and earthig contact (18) at right angles to each other and tighten earthing
contact (18) Figure 62, figure 63
22. Press distance "I" between rear contact finger (20) and stop (21) of earthing contact (18)
(compensation for play of coupling rods) Figure 64
23. Tighten T-type clamps (329) on the earthing-switch shafts
24. Set earthing switch to the OFF position
25. Shorten operating rod (71) so that, in case of a manual test operation, all the rear contact fingers
are up against the stop in the ON position
1 6 with silicone grease 53
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