Siemens 3AH3 Instruction Manual page 31

Maintenance and lubrication
Table 2 gives the recommended
maintenance intervals for circuit breakers.
These intervals assume that the circuit
breaker is operated under "usual service
conditions" as discussed in ANSI/IEEE
C37.20.2, section 4 (for drawout circuit
breakers) or ANSI/IEEE C37.04, section 4 and
elaborated in ANSI/IEEE C37.010, section 4
(for outdoor distribution circuit breakers).
The maintenance and lubrication interval is
the lesser of the number of closing
operations or the time interval since last
maintenance.
Number of years/closing
Circuit
operations (whichever comes
breaker type
SDV6 5 years/10,000 operations
All others 10 years/10,000 operations
Table 2: Maintenance and lubrication schedule
The vacuum interrupter operator
mechanism is shown in Figure 19, with the
front cover removed to show construction
details. Both the opening 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 upon
the closing spring-crank and the insulating
couplers and linkages.
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
compatible.
For all lubrication (except electrical
moving or sliding surfaces), use one of
the following:
Source:
Klüber Isoflex Topas L32 or L32N:
Klüber Lubrication North America L.P.
www.klueber.com.
Fastener check
Inspect all fasteners for tightness. Both
first)
locknuts and retaining rings are used.
Replace any fasteners that appear to have
been frequently removed and replaced.
Manual spring-charging and contact-
erosion checks
Perform the manual spring-charging check
contained in the section describing the
installation check and initial functional tests
(refer to pages 9-10). The key steps of this
procedure are repeated here:
1. Insert the hand-charging crank into the
manual-charge socket at the front of the
operator control panel. Turn the crank
clockwise (about 48 revolutions) to
charge the closing spring. Continue
cranking until the CHARGED flag appears
in the window of the spring indicator.
2. Press the Close (black) pushbutton. The
contact-position indicator on the
operator control-panel should indicate
that the circuit breaker contacts are
CLOSED.
3. Perform the contact-erosion check.
Contact erosion occurs when high fault-
currents are interrupted. Determination
of acceptable contact condition is
checked by the visibility of the white
contact-erosion mark shown in Figure
20. The white contact-erosion mark is
located on the movable stem of the
vacuum interrupter, near the plastic
guide-bushing.
Klüber Isoflex Topas L32
(part 3AX11333H)
Klüber Isoflex Topas L32N (spray)
(part 15-172-879-201).
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