Siemens 38-3AH3 38 kV Instruction Manual page 44

Vacuum circuit breaker
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Figure 38: Primary disconnect in
mated position
Number of
breaker type
comes first)
10 years/
Table 2: Maintenance and
lubrication schedule
Inspection of primary disconnects
Figure 38: Primary disconnect in mated
position shows the primary-disconnect
contact-fingers engaged. When the
contacts are mated with the switchgear
primary-stud assembly, there is forceful
contact distributed over a wide area. This
maintains low-current flow per individual
contact finger.
Inspect the contact fingers for any
evidence of burning or pitting that would
indicate weakness of the contact-finger
Inspect the primary-disconnect arms for
physical integrity and absence of
mechanical damage.
Inspect the flexible connectors that
connect the bottom movable-contacts of
the vacuum interrupters to the lower
primary-disconnect arms for tightness and
absence of mechanical damage, burning
or pitting.
Using a clean cloth saturated with
isopropyl alcohol, clean old lubricant from
primary disconnects, and apply a very thin
layer of Siemens contact lubricant
(reference 15-172-791-233).
Checks of the stored-energy operator
The stored-energy operator checks are
divided into mechanical and electrical
checks for simplicity and better
organization. This first series of checks
determine if the basic mechanism is clean,
lubricated and operates smoothly without
control power. The contact-erosion check
of the vacuum interrupter is also
performed during these tasks.
Maintenance and lubrication
Table 2 gives the recommended
maintenance intervals for circuit breakers.
These intervals assume the circuit breaker
is operated under "usual service
conditions" as discussed in ANSI/IEEE
C37.20.2, section 8.1, and C37.04, section
4, together with C37.010, section 4. The
maintenance and lubrication interval is the
lesser of the number of closing operations
or the time interval since last
The vacuum-interrupter operator
mechanism is shown in Figure 39:
Operator mechanism lubrication on page
45, with the front cover and the operator-
control panel removed to show
construction details.
Both the tripping spring and the closing
spring are shown. The movable end of the
closing spring is connected to a crank arm.
The movable end of the opening spring is
connected to the jack shaft by a pull rod.
Clean the entire stored-energy operator
mechanism with a dry, lint-free cloth.
Check all components for evidence of
excessive wear.
Place special attention on the closing
spring-crank and the various pushrods and
Lubricate all non-electrical moving or
sliding surfaces with a light coat of
synthetic grease or oil.
Lubricants composed of ester oils and
lithium thickeners will generally be
For all lubrication (except electrical
moving or sliding surfaces), use one of
the following:
Klüber Isoflex Topas L32
(part 3AX11333H)
Klüber Isoflex Topas L32N (spray)
(part 15-172-879-201).
Klüber Isoflex Topas L32 or L32N:
Klüber Lubrication North America L.P.



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