52 ZX2 GAS-INSULATED MEDIUM VOLTAGE SWITCHGEAR
3.3.7.5. Installation of voltage transformers
Hazard warning
If the switchgear is in operation:
• Isolate the relevant switchgear section
before installing the voltage
transformers.
• 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
operating mechanisms off so that the
switchgear section cannot be switched
on by remote control.
• Remove the protective caps from the silicone
parts of the voltage transformers and store
them for further use.
Important note
Check the silicone part of the voltage
transformer for damage. Observe the
notes in section 3.1.3.
Clean and grease the silicone insulating
part of the voltage transformer as
described in section 3.1.3.
• Remove the dust protection caps or blanking
plugs from the voltage transformer sockets and
store the components for further use.
Important note
Clean the voltage transformer socket as
described in section 3.1.3.
Ground the threaded bores in the voltage
transformer sockets by fitting them with
countersunk screws, DIN 7991, M 8 x 30
—
Fig. 3.3.7.5.1:
Hexagonal pins for
fastening of the
voltage transformer
A
Hexagonal pin
Detail A
1. mcb: miniature circuit breaker.
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