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8.1 General
- Insulating gas:
WI panels have a hermetically
sealed pressure system in accor-
dance with IEC 62271-200. It
does not require any maintenance
over the panel‘s entire service life
(see also section 7).
- Switching units:
The components in the cladded
high-voltage parts of the panel
(vacuum circuit-breaker, discon-
nector and earthing switch) do not
require any maintenance either.
- Drive mechanisms / covers:
Drive mechanisms and covers
outside of the enclosure are cor-
rosion protected.
Damage to the paint, scratches
and deterioration must be re paired
immediately to avoid corrosion .
8.2 Servicing schedule
Warning!
The drives must not
be disassembled for
service and mainte-
nance work. Use in accordan-
ce with the intended purpose
would be compromised
(see section 1.3).
A visual inspection of the switch-
gear, including switching tests, is
recommended at intervals of at least
4 years, depending on the stress the
switchgear is subject to during ope-
ration, and on the operating condi-
tions.
Important!
In case of frequent con-
densation or air pollution
(dust, smoke and corrosive
gases), the maintenance intervals
must be adapted to the actual con-
ditions.
In case of soiling, the switchgear
panels must be cleaned by qualified
staff.
In case of doubt or if deviations from
the WI switchgear’s proper working
order are detected, the manufacturer
should be contacted.
Important!
Only specialist electricians
who are familiar with WI
switchgear are allowed to
perform maintenance work.
Warning!
Comply with the safety
provisions in section
1.5!
8 Servicing
>>
Mantenance interval
At least every 4 years
or depending on the actual
ambient conditions
After 12 years
•
once the max. admissible number of
breaking operations for the vacuum
chambers has been reached (see
section 8.5)
•
after 10,000 operating cycles of
the circuit-breaker or
•
after 1,000 operating cycles of the
disconnector or 1,000 operating
cycles of the earthing switch
Qualification / Work performed by
Staff certified accordingly for the
work to be done
Staff certified accordingly for the
work to be done
Manufacturer’s Service Center
Manufacturer’s Service Center
Work to be performed
•
Visual inspection of the switchgear
panels.
•
If necessary, clean panels and test-
run drive mechanisms manually.
•
Lubricate the drive mechanisms
and perform switching tests.
•
Check releases/blocking coils.
•
Exchange pole sections with vacu-
um chambers.
•
Revision of the switching device.