IB131006EN
Page 42
Effective 07/2017
SECTION 6: INSPECTION, MAINTENANCE
AND TROUBLESHOOTING
6-1 INTRODUCTION
WARNING
DO NOT WORK ON A BREAKER ELEMENT WITH
PRIMARY POWER APPLIED.
DO NOT WORK ON A BREAKER ELEMENT WITH
SECONDARY CONTACTS CONNECTED.
DO NOT WORK ON A BREAKER ELEMENT WITH
SPRINGS CHARGED OR CONTACTS CLOSED.
DO NOT DEFEAT ANY SAFETY INTERLOCKS.
DO NOT LEAVE MAINTENANCE TOOL IN THE
SOCKET AFTER CHARGING THE CLOSING
SPRINGS.
DO NOT STAND LESS THAN ONE METER AWAY
FROM THE BREAKER ELEMENT WHEN TESTING
FOR VACUUM INTEGRITY.
FAILURE TO FOLLOW ANY OF THESE
INSTRUCTIONS MAY CAUSE DEATH, SERIOUS
BODILY INJURY, OR PROPERTY DAMAGE. SEE
SECTION 2 - SAFE PRACTICES
FOR MORE
INFORMATION.
6-2 FREQUENCY OF INSPECTION AND
MAINTENANCE
Periodic inspections and associated maintenance are
essential to the safe and reliable operation of VCP-W
Vacuum Circuit Breaker Elements. The inspection
frequency and associated maintenance recommended
are intended to insure the best possible ongoing
service. It is imperative that an established schedule be
followed. To establish an exact schedule for a specific
installation, use the following guidelines:
1. Customers
such
as
Utilities having extensive
experience with Power Distribution components
should schedule their inspection and maintenance
intervals using well established best practices in
their industry.
2. All other customers should use the following
guidelines as good conservative practice:
a. In a clean, non-corrosive environment,
inspect and maintain each circuit breaker
element annually or every 500 operations,
which ever comes first.
b. For special conditions such as frequent
circuit breaker element operation,
contaminated environments, and high
temperature/humidity conditions, the
inspection frequency should be a minimum
of twice per year.
3. Fault interruptions have the greatest impact on
contact erosion inside of the Vacuum Interrupters.
Circuit breakers that have been subjected to 15 full
rated fault interruptions should be immediately
inspected and the schedule for inspection and
maintenance should be re-evaluated based upon
the inspection results. Additionally, because of the
variability of system fault characteristics, if there are
any customer uncertainties in the records of the
magnitude, duration, or other fault details, increased
inspection frequency should be considered.
4. Follow the steps presented in Paragraph 6-3
entitled “Inspection and Maintenance Procedures”
for scheduled programs.
5. Create and maintain a dated permanent record of
all inspections, maintenance performed, actions
taken, observations made, and measurements
taken. Not only will this provide valuable historical
information, it can help to establish whether or not
the present schedule needs to be adjusted.
6. Perform ongoing visual inspections, when possible,
of all equipment on a regular basis. Be alert for an
accumulation of dirt in and around the circuit
breaker elements, loose hardware or discolored
insulation.
For assistance in establishing or updating a detailed
Inspection and Maintenance schedule for a specific
application, please contact your local Eaton
representative.
Eaton’s Vacuum Interrupters are tested to exceed the
minimum fault interruptions as required by IEEE/ANSI
and IEC Standards without inspection. Please contact
your local Eaton representative if you would like a copy
of the life curve of the Vacuum Interrupters in your
specific circuit breakers.
6-2.1 QUALIFIED
PERSONNEL
For the purpose of operating this type of equipment,
only individuals thoroughly trained in the operation of
power circuit breakers and associated equipment, and
having knowledge of connected loads may be
considered to be qualified.
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