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PowerVac
5kV Vertical Lift
®
Chapter 12. Repair and Replacement
12-1 General
The following information covers in detail the
proper method of removing various parts of the
breaker in order to make any necessary repairs.
This section includes only those repairs that
can be made at the installation site, or parts of
the breaker that are most subject to damage.
Important: Upon completion of any kind of re-
pair work, all interrupter and mechanism adjust-
ments must be checked.
Refer as needed to sections on mechanical and
electrical adjustments.
12-2 Replacement of
Interrupter (Assemblies)
Interrupters are supplied in complete interrupter
assemblies which include the vacuum inter-
rupter mounted in the interrupter support, and
primary studs. It is recommended that the inter-
rupter NOT be removed from the assembly in
the field.
CAUTION: DO NOT ATTEMPT TO REMOVE
OR REINSERT THE VACUUM INTERRUPTER
IN THE INTERRUPTER SUPPORT ASSEM-
BLY. SPECIAL TOOLS AVAILABLE ONLY AT
THE FACTORY ARE REQUIRED TO PREVENT
DAMAGING THE VACUUM INTERRUPTER
BELLOWS.
1
Figure 43. Pole Assembly
Courtesy of NationalSwitchgear.com
2
3
5
2
4
6
1
1. To remove the ML-19 element from the main
truck or frame.
a. Remove rear cover; disconnect surge
suppressors; remove rear interphase
barrier support and interphase.
b. Disconnect element-to-primary bus at
the element end.
c. Detach the Secondary Connecter
Bracket. Be sure to mark its location and
retain the shims for re-installation. De-
tach the MOC Driver from the Frame.
d. Properly support the ML-19 element
Remove (4) bolts at top of frame
(2) bolts at sides
e. Lift element clear of frame.
2. Close the breaker element and remove the
coupling clamp (Figure 23, Item 6). Hold
the hex projection (Figure 23, Item 7) at the
bottom of the operating rod insulator with
a 1 inch wrench and loosen the adjcent
lock nut with a 3/4 inch wrench. Screw
down the lock nut and the operating rod
insulator until clear of interrupter rod.
1. Mounting Bolts
2. Bus Runbacks
3. Primary Bus
4. Secondary Bus
5. Vacuum Interrupter
6. Movable Stem (clamp)
44
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