5. OPERATION 89
5.8.3. Operation of the isolating device for
integrated metering
Important note
Switching is performed by means of an
loaded immediately before switching
and released by pulling the knob
4
. The
knob may only be pulled when the
mechanism is in position A or B.
Maloperation is prevented by a pawl
6
.
Do not override the blocking function of
the pawl by using too much force!
As a snap-action mechanism is used, the isolating
device can also be operated when the busbar is
live.
As a snap-action mechanism is used, the isolating
device can also be operated when the busbar is
live.
The device for operation of the voltage
transformers for measurement of the front
busbar (fig. 5.8.3.1) is located above the low
voltage compartment. The device for operation of
the voltage transformers for the rear busbar is
accessible from the rear of the panel. Both
devices are operated identically.
The isolating device can be secured with a
padlock. Remove the padlock and swing flap
2
to the left.
The controls and displays for the voltage
transformers are located behind the flap. Observe
the instruction label inside the flap. Check the
switch position indicator
5
.
• Pull lever
3
down in the direction of the arrow
and move it to the right. Allow the lever to
engage in the limit position. The mechanism is
then loaded.
• Pull button
4
to release the mechanism and
change the switch position from “ON” to
“Grounded”. The voltage transformers are then
grounded as shown by switch position
indicator
5
.
• Leave lever
3
in the right-hand position.
Connecting the voltage transformers
• Pull lever
3
down and move it to the left (in the
opposite direction to the arrow). Allow the lever
to engage in the limit position. The mechanism
is then loaded.
• Pull button
4
to release the mechanism and
change the switch position from “Grounded” to
“ON”. The voltage transformers are then
connected to the busbar as shown by switch
position indicator
5
.
• Leave lever
3
in the left-hand position.
Fasten the flap with the padlock. (The flap cannot
be closed when the lever is not in position
A
or
B
.)
To Next Page
Loading...
