3. INSTALLATION OF THE SWITCHGEAR AT SITE 51
3.3.7.4. Dismantling of voltage transformers
Hazard warning
If the switchgear is in operation:
• Isolate the relevant switchgear section
before dismantling the voltage trans-
formers.
• Comply with the safety regulations of
• Test the switchgear section for the
off-circuit condition in accordance with
section 5.1.
• Ground switchgear section and secure
the working area in accordance with
• Switch the mcbs (
1
-
erating mechanisms off so that the
switchgear section cannot be switched
on by remote control.
• Dismantle the casing (fig. 3.3.7.3.7).
• Dismantle the cover plate (fig.3.3.7.3.7).
• Dismantle the wiring for the voltage transform-
ers and the damping resistor as far as neces-
sary.
• Dismantle the transformer cover
(fig. 3.3.7.3.5).
• Start the dismantling procedure with one of the
outer voltage transformers.
Voltage transformers for operating voltages
> 24 kV
• Remove the two screws on the hexagonal pins
as shown in fig. 3.3.7.3.2.
Voltage transformers for operating voltages up
to 24 kV
• Remove the screws in the flange of the voltage
transformer.
The further dismantling procedure is identical
for both types of voltage transformers.
• Draw the voltage transformers vertically out of
the sockets.
• Cover the silicone insulating parts of the volt-
age transformers with the protective caps sup-
plied to protect them from soiling and damage.
• Remove the three grounding screws
(fig. 3.3.7.2.1) on the flange of the voltage trans-
former socket, if fitted.
• Close off the open voltage transformer sockets
with insulating blanking plugs prior to bringing
the panel on line or performing high voltage
testing.
1. mcb: miniature circuit breaker.
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