IG-273-EN version 03; 05/08/2020
7
General instructions
cpg.0 ENA range
General description
Cable compartment
The cable connection compartment, located at the bottom
part of the cubicle, is interlocked such that front access to the
medium voltage cables is not allowed until the main circuit
is earthed. This compartment is prepared to withstand an
internal arc in terminals up to 5 kA - 1 s, meeting the criteria
of Annex A of Standard IEC 62271-200, class IAC: AF, AFL or
AFLR.
Both voltage and current transformers can be housed inside
the cable compartment.
Figure 1.4. Cable compartment detail
All the elements making up the enclosure are earthed
by means of a conductor consisting of a copper bar,
sized to withstand the rated short-time current. This is
located in the cable compartment, it does not need to
be dismantled in order to insert or remove a cable and
its corresponding termination.
[2]
In accordance with model; see the unit's Name Plate.
Gas pressure exhaust duct
The cubicle is certied to withstand an internal arc in the
gas tank up to 25 kA - 1 s
[2]
, meeting the criteria of Annex AA
of Standard IEC 62271-200, accessibility class IAC: AF, AFL
or AFLR
1
Gas pressure exhaust diaphragm
2
Gas vent from cable compartment
Figure 1.5. Pressure relief diaphragm and gas vent detail
A exhaust duct made of metal sheet, conducts the gases
produced by an internal arc towards the top of the cubicle,
from any of the three compartments: gas tank, cable
compartment and busbar compartment.
Figure 1.6. Gas pressure relief duct detail (1)
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