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The use of unauthorized parts in the repair of the equipment, or tampering by unqualified
personnel can result in hazardous conditions, that can result in death, serious injury or property
damage.
Follow all safety instructions contained herein.
Cleanliness check
Figure 4: Vacuum circuit breaker magnetic-
actuator operator module on page 11 is a
side view of the circuit breaker with the
insulating barriers removed (if furnished) to
show the vacuum interrupters, and the
fixed-end and moving-end connection pads
(29.0).
All of these components must be clean and
free of dirt or any foreign objects. Use a dry
lint-free cloth. For stubborn dirt, use a clean
cloth dipped in isopropyl alcohol (except for
the vacuum interrupters). For stubborn dirt
on a vacuum interrupter use a cloth and
warm water and a small amount of mild
liquid-household detergent as a cleaning
agent. Dry thoroughly using a dry lint-free
cloth.
Inspection of flexible connectors
Inspect the flexible connectors that connect
the movable contacts of the vacuum
interrupters to the moving-end connection
pad (29.0) for tightness and absence of
mechanical damage, burning or pitting.
Checks of the magnetic-actuator operator
mechanism
The magnetic-actuator 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. The
contact-erosion check of the vacuum
interrupter is also performed during these
tasks.
Maintenance and lubrication
Table 3 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
C37.04, 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.
The magnetic-actuator operator mechanism
is shown in Figure 16: Magnetic-actuator
operating mechanism lubrication on page
31, with the front cover (60.1) removed to
show construction details. Both the
magnetic actuator and the opening spring
(64.0) are shown. The movable end of the
opening spring (64.0) is connected to a
lever (63.5) on the jack shaft (63.0). Clean
the entire linkage assembly and opening
spring (64.0) with a dry, lint-free cloth.
Check all components for evidence of
excessive wear. Place special attention to
the insulating couplers (48.0) 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 be generally
compatible.
Number of
Circuit
years/closing
breaker
operations
type
(whichever
comes first)
5 years/
SDV7-MA
10,000 operations
Table 3: Maintenance and
lubrication schedule
29
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