42 ZX2 GAS-INSULATED MEDIUM VOLTAGE SWITCHGEAR
3.3.7.1 Dismantling of voltage transformers
Voltage transformers for metering 1 can be
equipped with a terminal box (Fig. 3.3.7.1.1) or
with a plug-in system (Fig. 3.3.7.1.3) for the sec-
ondary wiring.
Hazard warning
If the switchgear is in operation:
• Isolate the relevant outgoing feeder
panel before dismantling the voltage
transformers.
• Comply with the safety regulations of
• Test the feeder panel for the off-circuit
condition in accordance with
section 5.1.
• Ground the feeder panel and secure the
working area in accordance with
• Switch the mcbs (
1
operating mechanisms off so that the
feeder panel cannot be switched on by
remote control.
—
Fig. 3.3.7.1.2:
View from the rear into
the cable termination
compartment with the
cover removed: position
of the fastening screws
for the lower crossbeam
—
Fig. 3.3.7.1.3:
Installation position of
the voltage transform-
ers secured by retaining
plate and padlock
—
Fig. 3.3.7.1.4:
Locking knob and
locking plate
Lower crossbeam
Locking
knob
Locking
plate
Voltage
transformer
1. mcb: miniature circuit breaker.
—
Fig. 3.3.7.1.2
—
Fig.3.3.7.1.4
—
Fig. 3.3.7.1.1:
Voltage transformer
with a terminal box
• Remove the cover from the cable termination com-
partment.
• Dismantle the lower crossbeam in the cable termina-
tion compartment by removing the screws marked in
fig. 3.3.7.1.2.
• Disconnect the plugs for the secondary wiring of the
voltage transformers or remove the cables from the
terminal box.
• Remove the padlock (fig. 3.3.7.1.3), slide the retaining
plate to the right and also remove it. Store the parts
for further use.
Important note
Only disengage the locking knob
transformer is supported by the
assembly aid (also named “VT-truck
• Start dismantling with the middle voltage
transformer. Insert the assembly aid into the cable
termination compartment up to the stop. Allow the
assembly aid to engage with the stop.
Padlock
—
Fig.3.3.7.1.1
Terminal box
Padlock
—
Fig.3.3.7.1.3
Plug-in system
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