104
—
7. Operation of the switchgear
Withdrawable metering parts
Handling of the withdrawable metering part in
the metering panel is as described in "7.1
Switching operations", without, however, the
switching operations and interlocking functions.
Withdrawable metering parts in incoming and
outgoing feeder panels are moved into the cable
compartment using a ramp. They reach their
service position immediately and engage in the
panel earthing by two locking pins at the sides.
The voltage transformers used correspond to the
type used in the metering panel, and therefore
HRC fuses can also be used along with the voltage
transformers.
ConVac vacuum contactor
The medium voltage ConVac contactor operates
in alternating current and is normally used to
control devices requiring a high number of hourly
operating sequences. ConVac contactor has a
linear electromagnetic actuator that moves in line
with the moving contact of the vacuum
interrupters to guarantee the best performance
and long, reliable mechanical life. They are ideal
for controlling motors, transformers, capacitor
banks, switching systems, etc. Fitted with fuses,
they can be used in circuits with up to 50 kA fault
levels. ConVac contactors are suitable for AC4
category according IEC 62271-106. For details,
please refer to manual.
VSC vacuum contactor
The VSC vacuum contactor is ideal for controlling
AC installations requiring a high number of
operations. The contactors basically consist of a
moulded resin monoblock, housing the vacuum
interrupters, moving apparatus, control
electromagnet, multivoltage control feeder and
auxiliary accessories. The monoblock is also the
support for assembly of the fuse-holder frame.
Closing of the main contacts is carried out by the
control electromagnet. Opening is carried out by
a special opposing spring. The fuses are
positioned in special supports to be connected in
series between the contactor and the user. The
supports can house fuses in compliance with DIN
or BS standards. For details, please refer to
manual.
Figure 171:
1 Cast resin tube (with fuse cartridge)
2 Voltage transformer
Withdrawable part with metering panel
VSC vacuum contactor
Figure 172:
ConVac vacuum contactor
1 Signalling device ON/OFF
2 Operating cycle counter
3 Fuse installed indicator
4 Fuse intervened indicator
1
2
3
4
1 Signalling device ON/OFF
2 Operating cycle counter
Figure 173:
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