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VM1/A/P
- INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 K A
8.6. Mechanism and transmission
system
The mechanism requires visual inspection of
hardware, lubrication and operation during routine
inspection.
Remove the front cover by unfastening its screws
and correct any loose or missing hardware.
Always lubricate the working surface of the moving
parts. Verify lubrication on the connections of the
actuator and lever arm. Remove any grease on the
circuit breaker frame. Use only ISOFLEX TOpas
NB52 (ABB GCE007249P0100/PL CRM). If the grease
becomes caked and dirty, remove with a clean cloth
and reapply lubrication.
Maintenance operations are aimed at ensuring
trouble-free operation of the apparatus for the
longest possible time.
In accordance with what is specified in the IEC
61208 / DIN 31 051 Standards, the following
operations must be carried out.
Inspection:
Determination of the actual conditions
Servicing:
Measures to be taken to maintain the
specification conditions
Repairs:
Measures to be taken to restore the
specification conditions.
DANGER
High speed mechanical parts. Serious injury
may occur.
Keep hands and tools clear of the mechanism
during opening and closing operations and
anytime the capacitors or opening springs
are charged. Before maintenance verify
“ready” lamp is off. Opening springs are
always charged when the circuit breaker is
closed.
A functional test of the drive must be carried out:
•
when the number the number of operating cycles
indicated has been exceeded, or
•
during maintenance operations.
Before carrying out the functional test, open the
circuit breaker and:
• take it to the test position (withdrawable circuit-
breaker) or
•
isulate the working area and make it safe in
conformity with the safety rules and according to
the regulations in force (fixed circuitbreakers)
•
follow the procedure for discharging the capacitor
•
carry out a visual inspection of the state (removing
the front panel), e.g. of:
- lubrication of the ball bearings
- the operation counter
- assembly of the sensors
- the position indicator.
—
8. Maintenance
Functional test:
•
Connect the power supply voltage.
• Carry out several no-load operations. This test
particularly applies to circuit breakers which are
rarely activated under normal conditions.
To check the capacitor, carry out a rapid O-CO cycle
of operations of the circuit breaker, by pressing the
pushbuttons on the front of the circuit breaker in
rapid succession.
•
The LEDs on the inductive sensors are activated as
soon as the circuit breaker has reached the closing
and opening limit positions.
Note
These operations can only be carried out by ABB personnel or suitably
qualified and specially trained personnel.
Circuit breaker pole
The circuit breaker pole and relative vacuum
interrupter are maintenance-free up to the
maximum number of electrical operations foreseen
for the type of interrupter.
The operating life of the vacuum interrupter is
defined by the sum of the ultimate currents
corresponding to the specific type of interrupter in
accordance with what is indicated in the graphs of
par. “Trip curves”: when the sum of the ultimate
currents is reached, the complete pole must be
replaced.
Note
Dismantling and replacement of the pole can only be carried out by ABB
personnel or suitably qualified and specially trained personnel, especially for
the necessary adjustments.
8.7. Inspections and functional
tests interruption device in
general
•
Carry out regular inspections to check that the
interruption devices are in good condition.
•
Inspection at fixed intervals can be waived when the
apparatus is permanently monitored by qualified
personnel.
•
Above all, the checks must include a visual
inspection to check for any contamination, traces of
corrosion and electrical discharge phenomena.
•
Carry out more frequent inspections when there are
unusual operating conditions (including adverse
climatic conditions) and in the case of
environmental pollution (e.g. heavy contamination
or an atmosphere with aggressive agents).
•
Visual examination of the isolating contacts.
Turning the system of contacts alternately is
recommended, in order to keep the internal surface
of the contact areas clean. The contact areas must
be cleaned if there are signs of overheating
(discoloured surface) (also see the paragraph on
“Repairs”).
Summary of Contents for VM1/A/P
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