31
5.2.3. operating life
All vacuum circuit-breakers are characterised by simple,
sturdy construction and long useful life. Frequent operation of
the service and shortcircuit currents does not negatively affect
the degree of vacuum of the interrupters.
Typical useful life expectancy of a Vmax vacuum circuit-
breaker is determined by the following factors:
• vacuum interrupter, maintenancefree up to 10,000
mechanical operating cycles.
• drive with magnetic actuator, maintenance free under
normal service conditions
- up to 10,000 operating cycles for all the circuit-breakers
with breaking capacity up to 31.5 kA and rated current up
to 1200 A
• indication of ON/OFF position up to 10,000 operating cycles
• withdrawable truck: up to 500 handling operations can be
carried out in the case of normal activation and with regular
inspections.
The data on the useful life are in principle applied to all the
components which are not directly affected by the operator.
The useful life of the manually activated components
(movement of the withdrawable truck, etc.) can vary
according to the type of handling.
The time intervals and amount of maintenance are determined
by environmental agents, by the frequency of operation and
by the number of trip operations under short-circuit.
5.2.2. Mechanism
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 grease Isoflex Topas Nb52 (Abb No GCE0007249P100
1Pt.can). 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 C37.04 - C37.54
- C37.09 - C37.55 Standards and NETA 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.
HIGH SPEED MECHANICAL
PARTS, SERIOuS INjuRy MAy
OCCuR.
kEEP HANDS AND TOOLS
CLEAR OF THE MECHANISM
DuRING OPENING AND
CLOSING OPERATIONS AND
ANyTIME THE OPENING
SPRINGS.
OPENING SPRINGS ARE
ALwAyS CHARGED wHEN THE
CIRCuIT-bREAkER IS CLOSED.
DANGER
