Advertisement
1.7 Remove bolt (31.2), lock washer and
large washer at stationary contact of the
vacuum interrupter (24 mm socket with
extension).
1.8 Using a deep 24 mm socket with an
extension, loosen and remove the hex-
head bolt fastening the upper pole-
support to the post insulator. Completely
remove the upper pole-support and set
aside.
1.9 Grasp the vacuum interrupter (30.0) and
withdraw vertically upward. Assistance
may be required to spread the clamp and
work the terminal clamp off the movable
stem of the vacuum interrupter.
FORCIBLE TWISTING EFFORT IS NOT
ALLOWED. If the terminal clamp cannot
be easily removed, STOP!, check to be
certain hardware is loose and the clamp
is not binding.
2.0 Installing a vacuum interrupter
Note: Replacement vacuum interrupter (30.0)
will be received from the factory with an eye
bolt (36.3) in place, adjusted and torqued to
specific requirements. DO NOT ALTER THE
ADAPTER (eye-bolt) SETTING.
2.1 Inspect all silver-plated connection
surfaces for cleanliness. Clean only with
a cloth and solvent. Do not abrade, as
this will damage the silver plating.
2.2 Insert vacuum interrupter (30.0) in the
lower pole-support (40.0) with the
vacuum-interrupter label facing away
from the mechanism housing. Slip
terminal clamp (29.2) into position on
the movable stem.
2.3 Align vacuum interrupter and fasten
finger-tight using heavy flat-washer, lock
washer and nut (31.2).
2.4 Fasten the upper pole-support to the
post insulator using finger pressure only
using hex-head (M16) bolt, lock washer
and flat washer.
2.5 Attach struts (28.0) to the upper pole-
support (20) and replace hardware
(M10), but do not tighten at this time.
2.6 Couple levers (48.6) and drive link (48.9)
to the eye bolt (36.3), using the pin
supplied. Apply retention clips.
Appropriate pin is modestly chamfered,
not to be confused with pin for the
insulated coupler.
2.7 Raise terminal clamp (29.2) against the
spacer (29.3) on the movable terminal of
the vacuum interrupter (36.1) and
position the vacuum interrupter (30.0)
so that its groove faces the connecting
surface of flexible strap (29.1). Refer to
Figure 43: Illustration showing
required technique for fastening
terminal-clamp hardware on page 57
and employ the technique illustrated to
fasten the terminal clamp. Note
opposing wrenches. Tighten the bolt(s)
of the terminal clamp to a torque of
40 Nm (30 ft-lb), taking care to see that
the terminal of the vacuum interrupter is
not subjected to excessive bending
movement.
Note: Excessive bending movement exerted
while fastening the terminal clamp will
damage the vacuum interrupter.
2.8 Align pole support (20.0) correctly and
tighten bolt fastening it to the post
insulator. Fasten securely all bolts
associated with struts (28.0).
2.9 Tighten upper fastening bolt (31.2) on
the upper pole-support (20.0) holding
the vacuum interrupter firmly by its
upper insulator and operate levers (48.6)
by hand to see whether the movable
contact moves freely. If any binding or
lack of freedom is noted, loosen bolt
(31.2) and adjust the vacuum interrupter
in pole support by turning the vacuum
interrupter and moving it slightly. Torque
M16 bolt to 91-101 ft-lb (123-137 Nm).
55
Advertisement
