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Worm Gear Mechanism
With ground strap in place on vertical operating
pipe, slide worm gear mechanism (Fig. 5) over the
vertical operating pipe and attach it to the
structure. Remove the small position indicators,
which are attached to the worm gear coupling with
Allen set screws. Tighten hex head set screws in
the coupling until the vertical operating pipe is
pierced. The three-pole switch should now be
operated manually to check for proper adjustment.
If all stops at switch elevation have been set,
including the offset bearing, then it is safe to
reinstall the position indicators on the worm gear
mechanism.
These indicators should not quite
touch the raised boss on the worm gear housing in
either the open or closed position. There is a
possibility of damage to the indicators or the
coupling if this is not observed
Motor Operator
For remote operation, a motor operator is supplied
and it should be installed per the instructions
supplied with it.
Step 10—Arcing Horns or Arc Restrictors
When arcing horns of Arc Restrictors are supplied,
they should now be installed and adjusted in
accordance with the drawings. The stationary horn
is attached to the jaw and should be adjusted, or
even bent slightly, to give a light contact pressure
between the horn and the switch blade.
Step 11—Installation of Sleet/Corona Shields
The combination sleet/corona shields should now
be installed over the blade mechanism at the top of
the center insulator stack and on top of the two
jaws as shown on single pole drawings.
Step12—Final Checks
The completed 3-pole installation should be
checked for the following:
1. In the open position, the blades should be at an
angle of 70° to the centerline of the switch
base, and stop at each base and the stop for the
operating bearing should be touching, or
nearly so. The indicator at the worm gear
operating mechanism should indicate the
switch is open.
2. In closing, blades should make central entry
into their jaws at approximately the same time.
3. In the closed position, all blades must be in
full contact with jaw contacts and also vertical
within the tolerances described previously. The
stop at each switch base and the stop for the
operating bearing should be touching, or nearly
so. The indicator to the worm gear operating
mechanism should indicate the switch is closed.
MAINTENANCE
A certain amount of care and inspection is
recommended. The frequency of inspection depends
upon atmospheric conditions and frequency of
operation.
The service interval is largely
determined
by
the
maintenance is similar to that listed in the latest
industry standards.
1
First, it is important that the
insulators are always clean. It is also important that
the contacts be examined to see that they are
aligned, clean, and have a firm uniform pressure. If
the contacts are pitted, or burned to some extent,
they should be removed and replaced.
Under normal service conditions, the jaw contacts
should be examined and maintained at least once a
year, depending upon the type of atmosphere to
which they are exposed.
Periodic maintenance should consist of cleaning the
contact surfaces thoroughly by carefully scraping
off any contamination or deposit and sanding the
surface entirely clean, a coating of lubricant should
be applied. Suggested lubricants are MOBIL 28
grease of NO-OX-ID "A Special". MOBIL 28 is an
Exxon Mobil Company product. NO-OX-ID is
made by SANDCHEM INC.
In general, operating linkages require virtually no
maintenance. However, in contaminated
atmospheres of where operation under sleet
conditions is common some lubrication at pivot
points may be desirable. The grease used should be
durable even when exposed to the elements, and
should retain its viscosity over a wide temperature
range.
Terminal Connections
The aluminum surface of the terminal connection
provides for easy current transfer.
1
ANSI C37.35 (American National Standard Guide for
the Application, Installation, Operation and Maintenance
of High-Voltage Air Disconnecting and Interrupter
Switches)
user.
Recommended
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