Shutter operating module
Shutter operator/actuating
bars (one pair), removable
The mechanical position indicator will show
‘ISOLATED’ in white letters on a green
background.
In this ISOLATED position the operational
interlocks are set to function.
The ISOLATED position is sometimes referred
to as the TEST position because in this
position switching tests can be carried out on
the contactor while it is disconnected from the
main busbars.
7.1.4 Vacuum contactor – V7/ZVC
The V7/ZVC vacuum contactor is ideal for
controlling loads requiring a high number of
operations. The contactors basically consist of a
moulded resin monoblock, where the vacuum
interrupters, moving apparatus, control
electromagnet, multi-voltage control feeder and
auxiliary accessories are housed. The monoblock
is also support for the HV fuses. Closing of the
main contacts is carried out by means of the
control electromagnet. Opening is carried out by
means of a special opposing spring. The
contactor can be equipped with electrical or
mechanical latching.
The HV fuses are positioned in special chambers.
The chambers can house two fuses per phase
mounted in parallel configuration.
7.1.5 Earthing switch – type ZVCE7
The earthing switch - type ZVCE7 - has a snap
closing mechanism which is independent of the
rotation of the drive shaft. An earthing switch
(4/12) is only enabled for switching when
withdrawable fused contactor is in the
ISOLATED position or removed from the
switchgear panel. Only turn earthing switch ON
when the doors are closed.
Manual opening and closing:
•
Engage the earth switch handle (refer to 9.6
Tools) with the operating shaft (4/12)
Note:
Point the earth switch handle upwards or
downwards on the hexagonal shaft so that
there is sufficient room for movement of the
operating lever even if space is limited at the
sides.
•
Turn the handle clockwise through 90° until
the stop is reached to close the earthing
switch, or anticlockwise until the stop is
reached to open the earthing switch
•
Observe the mechanical/electrical switch
position indicator
•
Remove earth switch handle
Caution!
Make sure that the earth switch handle
is turned right up to the stop in the opening
process, to ensure that the earthing switch
is in its defined limit position. The manual
operating mechanism can also be fitted
with a locking magnet.
If the operation is prevented, do not force
the interlock and check that the operation
sequence is correct.
7.2 Test procedure
7.2.1 Testing the off-circuit condition
In switchgear panels which are not equipped with
capacitive insulators, checking the off-circuit
condition is carried out with a HV tester on the
tulip contacts (4/10), after the corresponding
top shutter or lower shutter has been opened.
Shutter opening can be carried out by means of
module (7/8).
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U N I G E A R Z V C
M E D I U M V O L T A G E P R O D U C T S
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7/8 Shutter
operating module
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7/8