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16
O W I I I – I N D O O R D I S C O N N E C TO R
6.3 Disconnector equipped with motor drive
Electric drives enables electrical operation of dis-
connectors remotely and locally as well as manually
by hand lever. Detailed rules for handling drives are
described in the separate assembly and operating
instructions delivered with drives.
7.
Warning: During carrying out all kind of works
nearby live high voltage apparatuses one must
strictly follow all relevant safety regulations. Not
following these regulations may lead to serious
injuries or death.
Maintenance activities consist of:
a) visual inspection,
b) periodical inspection,
c) disconnector maintenance
d) renovation
Warning: In order to proceed to the following ac-
tivities operating personnel must:
– Follow relevant safety regulations when working
nearby live high voltage equipment and carry out
the required preparatory actions
– Switch off the electrical supply, disconnect the
control voltage and take steps to safeguard the
site of work against accidental switching on the
supply voltage
7.1
The visual inspection must be carried out within
the scope and dates specified in the Energy Equip-
ment Exploitation Regulations and the internal
regulations of the user. In addition, inspection
should be carried out after each failure of the dis-
connector or short circuit in the network where the
apparatus is installed.
During inspection special attention should be
drawn to:
a) condition of insulators, insulation rods and insu-
lating barriers (if assembled)
b) condition of the current leading parts,
c) correct contact in closed position of the discon-
nector,
d) surface quality of the contact parts, correctness
of reaching end positions.
7.2
Periodic maintenance checks have to be carried
out once every five years. During the review there
should be checked:
a) insulator conditions and insulating barriers (if
mounted) with particular attention to the qual-
ity of surface of insulators, rods and barriers
UEMC 41
Maintenance
Visual inspection
Periodical inspection
b) the condition of terminals and the earthing
terminal, witch checking whether the screws are
not loosed and they have no signs of corrosion,
c) the condition of contacts with attention to their
cooperating surfaces, and checking whether
they do not show traces of melting, silver coat-
ing defects and whether the contact is correct
between fixed and movable knife.
d) condition of pressure springs and their protec-
tive covers
e) cooperation of disconnector with drive and
auxiliary switch,
f) simultaneous of occurrence and disappearance
of contact within current path
g) condition of protective coatings
h) of the mechanical or electromagnetic lock of the
drive,
i) the status of the contacts of apparatus by the
auxiliary switch
In case of significant defects, such as damaging
the disconnector or the drive, or endangering the
safety of operating personnel, immediately turn
off the drive and apparatus from use and remove
the defects or contact the manufacturer of the
device.
7.3
Maintenance work
The purpose of maintenance work is to remove
possible defects detected during periodic inspec-
tion. In addition, during maintenance the following
activities should be conducted:
a) cleaning surfaces of insulators, insulation rods
and insulating barriers,
b) cleaning cooperating surfaces of fixed contacts
and movable contacts and covering them with
acid-free grease (recommended grease: Isoflex
Topas NB52)
c) renovation of damaged covers
d) removal of other defects detected during the
periodic inspection
7.4
Repairs
Repair of disconnectors can be done by ABB ser-
vice or by technicians trained by the manufacturer.
8
Packing, transport, storage
Disconnectors are delivered to the consumer in
a package that protects the apparatus from dust
and light impacts. To place of storage or installa-
tion disconnectors should be transported by cov-
ered means of transport. The units should be
stored in closed and dry places in the package.
Transport and storage and handling should be
in accordance with the operating marks on the
packaging.
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