ABB VersaRupter, Installation, Operation And Maintanance Manual

Page: 47 / 83

VersaRupter MV Indoor Switch | Installation and Operation Manual
47
Replacement of Contact Knife with Draw Bar
3. Attach the new main contact with the contact knife
and draw bar to the insulator as shown in figure 112.
4. Grease the new contact knife with ISOFLEX NCA 52 and
check that it enters the fixed main contact correctly,
and also that the arcing knife moves freely in the arc-
ing chamber when closing and opening. The arcing
knife does not have the same position related to the
contact knife during the closing and opening move-
ment. The contact knife must rotate firmly at the
pivot point without jerking.
5. Attach the draw bar to the main shaft near the eccen-
tric bolt (2.3) and secure with the washer and cir-clip
(2.1).
6. The depth of the engagement between the fixed and
the moving contact can be adjusted by the eccentric
bolt (2.3), shown in figure 113, or by moving the insu-
lator (2.4). Eccentric bolt should be torqued to 32
Nm.
Figure 111
Figure 112
Figure 113