9 |
P a g e
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 user. Recommended
maintenance is similar to that listed in the latest
industry standards.
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 or NO-OX-ID
“A Special”. MOBIL 28 is an Exxon Mobil
Company product. NO-OX-ID is made by
SANDCHEM INC.
1
ANSI C37.35 (American National Standard Guide
for the Application, Installation, Operation and
Maintenance of High-Voltage Air Disconnecting and
Interrupter Switches)
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.
BEARINGS
The bearing of each switch and offset bearing is
a grease-less type. Figs. 12 and 13 show the
location of stop bolts and switch cranks on all
switch bearings. Figs. 14 and 15 show the
required location of stop blots and stop cranks
with a typical location of the adjustable radius
crank on the offset bearing.
Field Lubrication of Outdoor Switches
*None required at installation unless switches
were exposed to abnormal conditions during
storage for a considerable length of time.
During regular cleaning, give them a light coat
of grease.
Summary of Contents for DR7
Page 1: ...IB DR7 A May 2012 ...
