Powell 27PV25ASD, Руководство пользователя

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31
IB-65100
Maintenance
Ch 5 Maintenance
Note: Contact Powell Service Division for assistance
in performing maintenance or setting up
a maintenance program either by phone
(1.800.480.7273), by email
(info@powellservice.com), or by visiting our
website (www.powellind.com).
CAUTION CAUTION
!
Prior to beginning any maintenance
procedures, make certain that the control
circuits are deenergized and the circuit
breaker is resting securely outside the circuit
breaker compartment. Do not work on a
closed circuit breaker or a circuit breaker with
the main closing spring charged.
IMPORTANT IMPORTANT
!
Before attempting any maintenance work,
it is important to study and fully understand
the safety practices outlined in Ch 2 Safety of
this instruction bulletin. If there is any reason
to believe there are any discrepancies in the
descriptions contained in this instruction
bulletin, or if they are deemed to be confusing
and/or not fully understood, contact Powell
immediately.
A. G
ENERAL
D
ESCRIPTION
1) Introduction
A regular maintenance schedule must be
established to obtain the best service and
reliability from the circuit breaker.
PowlVac ASD circuit breakers are designed
to comply with industry standards requiring
maintenance every 500 operations
depending upon the rating of the circuit
breaker, or once a year.
The need for scheduled inspection and
maintenance depends on equipment
application conditions such as the number
of operations, magnitude of currents
switched, desired overall system reliability,
and the operating environment. Any
time the circuit breaker is known to have
interrupted a fault current at or near its
rating, it is recommended that the circuit
breaker be inspected and the necessary
maintenance be performed as soon as
practical. Inspection and maintenance
may be required at more frequent intervals
in some atmospheric conditions such as
extremes of dust, moisture, or corrosive
gases.
Very clean and dry conditions combined
with low switching duty will justify
longer times between inspection and
maintenance operations. An inspection
and maintenance schedule can be
developed by the user according to the
service requirements and conditions of the
specific circuit breaker.
If maintenance is performed at longer
time intervals than one year, the vacuum
integrity test should be performed each
time the circuit breaker is removed from
the metal-clad switchgear for reasons
other than scheduled circuit breaker
maintenance.