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A DVAC® 3 8 K V I N STA LL ATI ON , OPE R ATI ON A N D M A I NTE N A NCE M A N UA L
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Maintenance
The ADVAC® 38 kV circuit breakers are designed to
require minimal maintenance. Circuit breakers used
in a clean, non-corrosive environment require only
annual inspection. Dusty or corrosive environments
require inspection more often at the discretion of
the user. To ensure correct operation of the circuit
breaker, inspection and maintenance of the
tripping devices and charging motor must be
carried out every 2000 operations. For this
purpose, please contact ABB Service and consult
document number 1VCD601713 (for 40 kA and
3000 A) or 1VCP000558 (for 31.5 kA).
Do not work on an energized breaker.
Do not work on a breaker unless all components
are disconnected by means of a visible break and
securely grounded.
Do not work on a breaker with power supplied
to the secondary control circuit.
Do not defeat safety interlocks. This may result
in bodily injury, death and/or equipment damage.
Do not work on a closed breaker.
Do not work on a breaker with a charged closing
spring.
Do not use a circuit breaker by itself as the sole
means of isolating a high voltage circuit.
Do not leave a breaker in an intermediate position
in a cell. Always have the breaker in the disconnect,
test or connect position.
High speed mechanical parts. Serious injury may
occur. Keep hands and tools clear of the mechanism
during opening and closing operations and anytime
the closing or opening springs are charged. Before
maintenance, verify closing spring indicator reads
“discharged.” Opening springs are always charged
when the circuit breaker is closed.
Mechanism
The mechanism requires visual inspection
of hardware, lubrication and operation during
routine inspection.
Before beginning any maintenance, discharge
the closing springs by pressing the manual close
button. Open the breaker by pushing the manual
open button. Press the close and open buttons
again to ensure the breaker is fully discharged.
Verify springs are discharged by inspection of the
spring charge indicator. Remove the front cover.
Correct any loose or missing hardware.
Always lubricate the working surface of the cams
and the entire motor linkage assembly. Verify
lubrication on latching surfaces located above the
charging motor in the mechanism . Remove any
excess grease on the breaker frame. Use flex Topas
NB52 grease for lubrication. If the grease becomes
caked and dirty, remove with a clean cloth and
reapply lubrication. Use of incorrect lubricant may
cause breaker to malfunction.
Verify that operation of the manual close and open
push buttons is free and smooth. Replace the front
cover before operation. Perform functional test.
With the circuit breaker not connected to the load,
carry out a few open and close operations. If
foreseen, cut off the power supply to the spring
charging motor. Discharge the spring by closing
and opening the circuit breaker by means of the
close and open push buttons. Visually inspect the
lubrication condition of the tulip isolating contacts,
of the sliding surfaces, etc. Check correct electrical
and mechanical operation of the various devices,
paying particular attention to the interlocks. The
screws and nuts are tightened in the factory and
correct tightening is indicated with a collared mark.
