16 ZX2 GAS-INSULATED MEDIUM VOLTAGE SWITCHGEAR
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3. Installation of the
switchgear at site
3.1. Fundamental notes on installation work
3.1.1. General site requirements
At the start of installation, the switchgear room
at site must be complete and fitted with lighting
and power for the installation work. It must also
be lockable, dry, and with good ventilation
facilities. All necessary provisions such as
openings, ducts, etc. for laying of the power
cables must already be in place. Compliance with
the conditions for indoor switchgear to
IEC 62271-1 must be ensured.
3.1.2. Tightening torques
Use DIN screws of tensile class 8.8. Observe the
tightening torques in table 3.1.2.1. The tightening
torques apply to unlubricated screw connections.
• Please consult the manufacturer’s installation
instructions for the tightening torques of cable
connectors and surge arresters.
3.1.3. General information on treatment of
plug-in connectors with silicone insulating parts
This section generally explains the procedure for
treatment of silicone insulating parts in the
busbar sockets, blanking plugs for the busbars,
the silicone insulating parts on plug-in voltage
transformers and blanking plugs for voltage
transformer sockets. Only treat the silicone parts
immediately before use. Section 3.3. indicates
when the treated silicone parts are needed.
Please consult the documents from the cable
connector manufacturer for details of the
treatment procedure for silicone insulating parts
on the cable connectors.
Perform the following work to prepare silicone
insulating parts for assembly:
• Inspect the silicone insulating parts
• Clean soiled silicone insulating parts
• Grease the insulating parts
• Clean the sockets, the contact tubes and the
outer cone
Inspecting the silicone insulating parts
Important note
• Only remove the relevant component
from its protective packaging
immediately before assembly.
• Check the silicone insulating part for
damage prior to installation.
• If you note any damage on the silicone
insulating part, only use the component
after this has been agreed with our
service department.
The silicone surface must be free of
• gas bubbles,
• scoring,
• damage,
• abrasions,
• foreign bodies.
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Steel screw in T-nut
(foundation frame)
19.2
Nut on stud bolt 2.2 9.2
Steel screw in pulling nut
13.3 -
17.1
18.4 -
35.4
Nut on hammer head screw in
aluminum section
18.4
Screw in inner cone socket 14.8
Other screws of tensile class 8.8 19.2 36.9
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