8 Servicing
8.2 Servicing schedule
Series HVX vacuum circuit-breakers
require regular inspections. The in-
tervals depend on the strain to which
the switches are subject during ope-
ration, and on the operating conditi-
ons.
In case of frequent condensation or
air pollution (dust, smoke or corrosi-
ve gases), the maintenance intervals
must be adapted to the actual condi-
tions.
IMPORTANT:
The circuit-breaker opera-
ting company is responsible
for complying with the spe-
cified maintenance intervals and for
performing maintenance according
to the actual operating and ambient
conditions.
In case of queries or ambiguities,
please contact the manufacturer.
Only specialist electricians certified
by the manufacturer for maintenance
work regarding series HVX vacuum
circuit-breakers and who have the
required knowledge regarding ope-
ration of medium-voltage switchgear
are permitted to perform maintenan-
ce and cleaning work.
Warning!
Observe the safety pro-
visions of Chapter 1.5.
Warning!
Risk of injury:
The circuit-breaker
must not be disassem-
bled for maintenance
work.
1. On principle, the 5 safety rules
applicable for electrical enginee-
ring must be complied with befo-
re maintenance work on the cir-
cuit-breaker is started:
• Isolate switchgear from power
supply
• Prevent it from reclosing
• Verify it for zero voltage
• Earth and short-circuit it
• Cover or bar off adjacent live
components.
2. Switch off the supply voltage for
the circuit-breaker drive and se-
cure it against reclosing.
3. Release the energy-storing devi-
ce by performing the correspon-
ding operating sequence on the
circuit-breaker OFF – ON – OFF
(see Chapter 7) and re-mount
the drive´s transport securing de-
vice (see Chapter 6).
22
8.1 Safety
Servicing schedule
Maintenance intervals (ambient conditions
according to IEC 60 694)
Maintenance work
Qualification/position
performing the work
at least every 4 years
• Check for contamination/condensation
and damage
• If necessary, clean circuit-breaker/with-
drawable part (see section 8.3) and
perform several switching tests
Staff qualified accordingly
for the work to be done
after 20 years
• Clean, grease circuit-breaker/withdra-
wable part (see Chapter 8.3 and 8.6)
and perform several switching tests
• Check releases and blocking coils for
proper working order
after 10,000 operating cycles of the circuit
breaker
Revision of the circuit breaker
Manufacturer's Service
Center
after 1,000 operating cycles of the withdrawa-
ble part
Revision of the withdrawable part
once the max. admissible number of breaking
operations for the vacuum chambers has been
reached (see section 8.7)
Replace vacuum chambers
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