Maintenance
Inspection and Maintenance Intervals
Periodic inspections and maintenance are essential to ob-
tain safe and reliable operation of the SDV circuit breaker.
When SDV circuit breakers (manufactured beginning Janu-
ary, 1992) are operated under “Usual Service Conditions”,
maintenance and lubrication is recommended at five year
(one year if manufactured before January, 1992) intervals
or at the number of operations indicated in Table 3. “Usual”
and “Unusual” service conditions for AC High-Voltage Cir-
cuit Breakers are defined in ANSI C37.04, Section 4 and
ANSI C37.010, Section 4. Generally, “usual service condi-
tions” are defined as an environment in which the equip-
ment is not exposed to excessive dust, acid fumes, dam-
aging chemicals, salt air, rapid or frequent changes in tem-
perature, vibration, high humidity, and extremes of tem-
perature.
The definition of “usual service conditions” is subject to a
variety of interpretations. Because of this, you are best
served by adjusting maintenance and lubrication intervals
based on your experience with the equipment in the actual
service environment.
Regardless of the length of the maintenance and lubrica-
tion interval, Siemens recommends that circuit breakers
should be inspected and exercised annually.
For the safety of maintenance personnel as well as others
who might be exposed to hazards associated with mainte-
nance activities, the safety related work practices of NFPA
70E, parts ll and lll, should always be followed when work-
ing on electrical equipment. Maintenance personnel should
be trained in the safety practices, procedures and require-
ments that pertain to their respective job assignments. This
manual should be reviewed and retained in a location
readily accessible for reference during maintenance of this
equipment.
The user must establish a periodic maintenance program
to ensure trouble-free and safe operation. The frequency
of inspection, periodic cleaning, and preventive mainte-
nance schedule will depend upon the operation conditions.
NFPA Publication 70B, “Electrical Equipment Maintenance”
may be used as a guide to establish such a program. A
preventive maintenance program is not intended to cover
reconditioning or major repair, but should be designed to
reveal, if possible, the need for such actions in time to pre-
vent malfunctions during operation.
Recommended Hand Tools
Type SDV circuit breakers use both standard American and
metric fasteners. Metric fasteners are used for the vacuum
interrupters. American fasteners are used in all other loca-
tions. This list of hand tools describes those normally used
in disassembly and re-assembly procedures.
Open End or Box End Wrenches:
• 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, and 7/8 in.
Socket Wrenches: (1/2” drive preferred)
• 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, and 7/8 in.
• 18, 19 and 24mm (deep sockets)
• Ratchet
• 2 Extensions (6” maximum)
• Torque Wrench (0-150 ft-lbs.)
Hex Keys Wrenches: (socket type preferred)
• 3/16, 1/4 and 5/16 in.
• 8 and 10mm
Miscellaneous:
• Screw Drivers: 0.032 x 1/4 in. wide
and 0.055 x 7/16 in. wide
• Pliers
• Light Hammer
• Drift Pins: 1/8, 3/16 and 1/4 in. dia.
Recommended Maintenance and Lubrication
Periodic Maintenance and Lubrication should include all
the tasks shown in Table 2. Recommended procedures for
each of the listed tasks are provided in this section of the
manual.
Hazardous voltages and high-speed
mechanical parts.
Will cause death, serious injury or property
damage.
Read instruction manuals, observe safety
instructions and limit use to qualified
personnel.
Failure to maintain the equipment could result in death,
serious injury or product failure, and can prevent successful
functioning of connected apparatus.
The instructions contained herein should be carefully
reviewed, understood, and followed.
The maintenance tasks in Table 2 must be performed
regularly.
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