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9 Servicing
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9.1 General
- Insulating gas:
WS series panels have a hermetical-
ly 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 4).
- Switching units:
The components in the cladded
high-voltage parts of the panel
(vacuum circuit-breaker, disconnec-
tor and earthing switch) do not
require any maintenance either.
- Gas tank:
The pressure tanks are made of
stainless, non-magnetic steel.
Warning!
Neither drill holes into
nor open gas tanks.
Risk of loss of insu -
lating gas.
- Drive mechanisms / covers:
Drive mechanisms and covers out -
side of the enclosure are corrosion-
protected. Damage to the paint,
scratches and deterioration must be
repaired immediately to avoid corro-
sion.
Depending on the constraints occur-
ring during normal operation and on
the operating conditions, a visual
inspection of the panels should be
performed at regular intervals (every
4 years).
If dirt or condensation is detected,
the panels must be cleaned profes-
sionally. To this effect, only the deter-
gents which have been approved by
the manufacturer may be used (see
Annex).
When performing cleaning, make
sure that the lubrication in the drive
mechanisms is not removed. If the
drive mechanisms are no longer suf-
ficiently lubricated, new lubrication
must be applied.
Warning!
The drives must not be
disassembled for ser-
vice and maintenance
work. Disclaimer of liability
(see section 1.3).
Important!
In case of frequent conden-
sation or air pollution (dust,
smoke and corrosive gases),
the maintenance intervals must be
adapted to the actual conditions.
In case of ambiguities or irregulari-
ties, please contact the manufactu-
rer’s Service Center immediately.
9.2 Safety provisions
Only specialist electricians certified
by the manufacturer for maintenance
work and who have the required
knowledge regarding handling of
WS series medium-voltage switch-
gear are permitted to perform main-
tenance and cleaning work.
Warning!
Refer to the safety
provisions in section
1.5.
Mantenance interval
Every 4 years
After 12 years
• once the max. admissible number of
breaking operations for the vacuum
chambers has been reached (see
section 9.4)
• after 10,000 operating cycles of
the circuit-breaker or
• after 2,000 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
vacuum chambers.
• Revision of the switching device.
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