Maintenance
40
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2020-09-18
Limit
Limit: a - b = min.
3.5 mm or max.
7.5 mm
a
OPEN switch position
b
CLOSED switch position
Adjusting the switching
stroke of vacuum
interrupters
Torsional loading of the draw bar (40) of the vacuum interrupters (3) must be pre-
vented. The switching stroke must be readjusted to the same distance for all vacuum
interrupters.
7
Pole shell
40
Draw bar for vacuum interrupter
41
Locking nut
42
Adjusting nut
43
Spherical seat
If the permissible limit for the difference between “a” and “b” is reached, the inter-
rupters can be readjusted as follows:
• Remove the vacuum contactor from the switchgear if necessary
• Measure the distance between the top edge of the pole shell (7) and the top
edge of the draw bar (40), see Fig. 42 and Fig. 43 in the OPEN and CLOSED
conditions. This is done by switching the vacuum contactor CLOSED and OPEN
again.
• Use a size 12 open-end spanner to keep the adjusting nut (42) from turning.
• Use an additional size 13 open-end spanner to loosen the locking nut (41) over
the adjusting nut (42) and the spherical seat (43).
• To readjust the switching stroke:
Fig. 42
OPEN switch position
Fig. 43
CLOSED switch position
Fig. 44
OPEN switch position – cross-sectional view
Summary of Contents for 3TM
Page 12: ...Transport storage packaging 12 9229 0106 176 0 2020 09 18 Blank page ...
Page 26: ...Description 26 9229 0106 176 0 2020 09 18 Blank page ...
Page 36: ...Installation 36 9229 0106 176 0 2020 09 18 Blank page ...
Page 48: ...Maintenance 48 9229 0106 176 0 2020 09 18 Blank page ...
Page 50: ...Index 50 9229 0106 176 0 2020 09 18 Blank page ...