Instruction Book
Page 48
Effective: May 2016
For more information visit:
www.Eaton.com
IB131017EN
SECTION 6: INSPECTION AN MAINTENANCE
6-1 INTRODUCTION
WARNING
FAILURE TO INSPECT, CLEAN AND MAINTAIN
CIRCUIT BREAKERS CAN REDUCE EQUIPMENT
LIFE OR CAUSE THE EQUIPMENT NOT TO OPERATE
PROPERLY UNDER FAULT CONDITIONS. THIS
COULD RESULT IN EQUIPMENT DAMAGE, BODILY
INJURY OR EVEN DEATH.
WARNING
ONLY PERSONNEL FAMILIAR WITH THE HAZARDS
ASSOCIATED WITH WORKING ON POWER CIRCUIT
BREAKERS SHOULD CARRY OUT INSPECTION AND
MAINTENANCE PROCEDURES.
INSPECTION AND MAINTENANCE PERSONNEL
SHOULD BE FAMILIAR WITH THE SPECIFICS
ASSOCIATED WITH THE CIRCUIT BREAKERS AS
PRESENTED IN THIS INSTRUCTION BOOK.
DO NOT WORK ON A CIRCUIT BREAKER IN THE
CONNECTED POSITION.
DO NOT WORK ON A CIRCUIT BREAKER WITH
SECONDARY DISCONNECTS ENGAGED
DO NOT WORK ON A CIRCUIT BREAKER WITH
SPRINGS CHARGED OR CONTACTS CLOSED.
DO NOT DEFEAT ANY SAFETY INTERLOCKS.
DO NOT STAND LESS THAN ONE METER AWAY
FROM THE CIRCUIT BREAKER WHEN TESTING
FOR VACUUM INTEGRITY.
FAILURE TO FOLLOW ANY OF THESE
INSTRUCTIONS MAY CAUSE DEATH, SERIOUS
BODILY INJURY, OR PROPERTY DAMAGE.
6-2 FREQUENCY OF INSPECTION AND
MAINTENANCE
Periodic inspections and associated maintenance are
essential for the safe and reliable operation of VCP-TL
and VCP-TRL circuit breakers. 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. In a clean, non-corrosive environment, inspect and
maintain each breaker every 2000 operations or 3
years, whichever comes first.
2. For special conditions such as frequent breaker
operation, contaminated environments, and/or high
temperature/humidity conditions, the inspection
frequency should be more frequent.
3. Inspect a breaker every time it interrupts fault current.
4. Follow the steps outlined in Table
6.1
entitled
"Inspection and Maintenance Procedures".
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 breaker, loose
hard-ware or discolored insulation.
6-3 VACUUM INTERRUPTER INTEGRITY TEST
Vacuum interrupters used in these circuit breakers are
highly reliable interrupting elements. Satisfactory
performance of these devices is dependent upon the
integrity of the vacuum in the interrupter and the internal
dielectric strength. Both of these parameters can be
readily checked by a one minute ac high potential test.
(See Table
6.2
for appropriate test voltage.) During this
test, the following warning must be observed:
