45
O P E R A T I O N O F T H E S W I T C H G E A R
14.1
Hexagonal shaft for earthing switch operating
mechanism
14.2
Slide
122
Operating lever
6.1.3 Withdrawable metering part
Handling of the withdrawable metering or the
voltage-transformer part in the metering panel
is described in section 6.2.1. Withdrawable
voltage-transformer parts in incoming and
outgoing feeder panels are put into the cable
compartment using a ramp. They reach the service
position immediately and engage with the panel
earthing. The voltage transformers used correspond
to the type used in the voltage-transformer panel,
thereby allowing HRC fuses to be implemented.
6.1.4 Earthing switch - ET1
The earthing switch has a snap closing mechanism
which is independent of the rotation of the drive
shaft. An earthing switch allocated to a circuit-
breaker is only enabled for switching when the
withdrawable part is in the test/disconnected
position or removed from the switchgear panel.
Earthing switches should be turned on only when
the doors are closed.
Manual opening and closing:
•
Press the slide of the operating lever recess
socket downwards (Fig. 72) to open. If the
switch is closed, the slide will already be in
this position
Caution: If the operation is prevented, do
not force the interlock and check that the
operation sequence is correct.
•
Fit the operating lever (Fig. 73) onto the
hexagonal shaft, which is now released for
operation.
Note: Put the operating lever in a pointed
upwards or downwards position so that
there is sufficient room for it to move.
•
To close the earthing switch, turn the lever
clockwise through approx. 180 °until the stop
position is reached. Turning the lever in an
anticlockwise until the stop position is reached
opens the earthing switch
•
Observe the mechanical/electrical switch
position indicator
•
Remove the operating lever. The slide remains
open if the earthing switch is in the closed
position
Make sure the operating lever fully reaches the
stop position 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.
14.1
14.2
122
—
Figure 69 Preparing to operate the earthing switch - press
the slide downwards
—
Figure 70 Preparing to operate the earthing switch - operating lever
in upright position ready to switch to on/off position