IG-123-EN version 11; 23/07/2021
7
General instructions
cpg.0: GIS medium-voltage switchgear,
gas insulated, up to 40.5 kV,
in accordance with IEC Standard
General description
Cable compartment
[2]
There are four or six in the case of cubicles with rated outgoing current of 2500 A.
Located in the bottom part of the cubicle, this has a cover,
interlocked with the earthing circuit, which allows front
access to the medium-voltage cables. This compartment is
prepared to withstand an internal arc in cable connectors
up to 31.5 kA - 1 s, meeting the criteria of Annex AA of
Standard IEC 62271-200, class IAC: AFL/AFLR.
In the most complete case, the base can house the following
components:
• Phase segregation assembly (optional) consisting of the
main box and the segregating cover.
• Three
[2]
symmetrical screened cable connectors with
reinforced connection (screwable) by phase or four
asymmetric ones.
• Cable clamps for the medium-voltage cables.
• Earthing bars.
• Toroidal-core current transformers.
• Voltage transformers connectable through medium-
voltage cable or plug-in/disconnector.
All the elements making up the enclosure are earthed
by means of a conductor consisting of a copper at
bar, sized to withstand the rated short-time current.
This is located in the base, meaning it does not need to
be dismantled in order to insert or remove a cable and
its corresponding termination.
Figure 1.4. Voltage transformers connected by medium-voltage cable
Figure 1.5. Plug-in/disconnectable voltage transformers
Figure 1.6. Main box and segregation cover detail
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