Maintenance Procedures - GE Power Break II Installation Instructions Manual

10
Figure Rotating the breaker forward for inspection.

Maintenance Procedures

A regular maintenance schedule should be established
to obtain the best service
operating and local conditions dictate the frequency of
inspections required.
A permanent record should be kept of all maintenance
work. It will be a valuable reference for subsequent
maintenance work and
should include reports of tests performed, condition of
equipment, and repairs and adjustments.
Maintenance employees must follow all recognized
safety practices, such
National Electrical Safety Code and in
other safety regulations. Solid insulation surrounding
an energized conductor in power apparatus must never
be relied upon to provide protection to personnel.
Draw-out structure and connections should be given
the following overall maintenance
Maintenance frequency depends on the severity
service and atmospheric conditions. Equipment subject
to highly repetitive operation
frequent maintenance.
While some of these
breaker in the tilt-out position, a complete check can
only be made after removing the breaker from the
rails.
WARNING:
Before attempting any work on draw-out
devices, ensure that all sources of power-primary
and secondary-have been de-energized.
and reliability.
station operation. Records
as those contained in
company or
at least annually.
may require
steps can be done with
Power Break® II Circuit Breakers
A VERTISSEMENT:
intervention sur des appareils debrochable, verifier
que toutes les alimentations de puissance,
primaire et secondaire, sont coupees.
1.
Thoroughly clean the equipment by removing all
dust and other accumulations. Wipe
clean the
compressed air for blowing out equipment.
2. Inspect buses and/ or terminal lug connections for
signs of overheating or weakening of insulating
supports.
mechanical
functioning.
parts with a suitable lubricant, such as Mobil 28
red grease.
3.
Check primary
surfaces for signs
heating. If required, clean contacts with a suitable
solvent. Discoloration of silvered surfaces is not
Plant
harmful unless
deposits, such as sulfides, on the contact surfaces.
4.
Check to see that all anchor bolts and structure
bolts are tight. Inspect all cable or bus connections
for signs of overheating and tighten
connections. Check that all secondary connections
are secure and all control wiring is intact.
5. Mter cleaning
measure and record resistances to ground and
between phases
the
connections. Since definite limits cannot be given
for satisfactory resistance values, keep a record of
resistance
insulation from one maintenance period to the
next can be recognized by comparing readings.
Readings
conditions each time, if possible, and the record
of
should include temperature and humidity.
High potential tests are not required,
more
seems advisable, based on insulation resistance
tests or after repairs, test voltage should not exceed
the 75%
of the factory test voltage, which is two times
the rating plus 1000 volts.
6.
Operate each breaker in the
ensure proper functioning.
important for breakers that normally remain i n
either the opened or closed positions for long
periods.
7.
When the
conditions,
excessive moisture, schedule maintenance at more
5
Draw-Out Breaker Installation
Avant de commencer
buses and supports.
Check indicating
and key interlocks
Lubricate all moving and rubbing
and secondary
of abnormal wear
atmospheric conditions
with the breaker
of insulation on
readings so that weakening
should be taken under
TEST
This is
equipment is subject
such as contaminating
toute
a la fois
or vacuum
Do not use
devices and
for proper
disconnecting
or over­
cause
all loose
removed,
buses and
of
similar
but if it
position to
particularly
to unusual
fumes and