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46
Maintenance
01.4IB.77020
PowlVac-ND
®
and PowlVac-NDA
™
Series 4
Vacuum Circuit Breakers
B. M
echAnISM
A
reA
When any maintenance procedure requires
the opening or closing of the circuit breaker
or the charging of any of the stored energy
mechanism springs, exercise extreme caution
to make sure that all personnel, tools, and
other miscellaneous objects are kept well
clear of the moving parts or the charged
springs. Failure to do this may cause damage
to the equipment or moderate/minor injury to
personnel.
!
WARNING
1) Mechanical Operation
Remove the circuit breaker front cover
to expose the stored energy mechanism.
Make a careful visual inspection of
the mechanism for loose, damaged or
excessively worn parts.
Note:
If timing tests under
are to
be performed do not operate the
circuit breaker until these tests
are completed. Operation of the
mechanism may alter the “As found”
operating condition of the circuit
breaker’s stored energy mechanism.
Operate the racking mechanism through
one or two complete cycles and check
for the smoothness of operation. It will
be necessary to insert the secondary
disconnect override device into the
secondary disconnect receptacle to
perform this operation.
For further details see
D. Placing the Circuit Breaker Into Service,
Ch 4 Installation, D. Placing the Circuit
Breaker Into Service 6) Emergency Racking
Mechanism Check (PowlVac-NDA
™
Series 4
Circuit Breaker Only)
.
2) Lubrication
Before applying any type of lubrication to the
circuit breaker, the stored energy mechanism
should be in the OPEN position, and all springs
discharged.
CAUTION
Powell offers a complete lubrication kit
(Powlube-104) which contains all the
lubricants required for maintaining the
circuit breakers. Powlube-104 consists
of (1) A-grease, (1) B-grease, and (1) C-oil.
Prior to March 2014, Powell provided
Powlube-101 and Powlube-102 which
contained (1) tube of Anderol 757 or
Rheolube 368A, (1) tube of Mobilgrease 28
and (1) bottle of Anderol A456 oil.
A – Grease should be lightly applied to
those bearing surfaces that are accessible.
Inaccessible surfaces, such as bearings, may
be lubricated with a light synthetic machine
oil such as C - Oil. B – Grease should be
applied to the electrical contact surfaces.
Lubricate the stored energy mechanism
and other specified parts in accordance
for labeled lubrication photographs.
lists the location of all
surfaces that should be lubricated, the type
of lubricant to be used, and the method of
applying the lubricant. The guiding rule
in lubrication is to lubricate regularly, use
lubricant sparingly and remove all excess
lubricant. Tilting the circuit breaker will
enable the lubricant to cover the bearing
surfaces.
