Description and main characteristics
General instructions
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GIS-type medium-voltage switchgear with full insulation in gas, up to 38 kV,
in accordance with IEEE Standards
IG-197-US version 02; 11/11/2019
For testing the gas pressure in each compartment, a
temperature-compensated pressure switch is installed, with
a volt-free contact, for possible use as a remote alarm or
blocking/trip for the functional unit.
Top busbar
This is used for connecting cubicles. It has solid and shielded
insulation, grounded by means of the compartment's specific
grounding bar.
As an option, the busbar is able to segregate the phases by
means of a set of grounded metal plates (metal-clad).
Toroidal current transformers and/or plug-in voltage
transformers can be installed in this compartment, thus
avoiding the need for metering cubicles.
Cable compartment
Figure 1.3.
Phase segregation in the cable compartment (optional)
Located in the bottom part of the cubicle, this has a cover,
interlocked with the grounding circuit, which allows front
access to the medium voltage cables.
In the most complete case, the base can house the following
components:
•
Phase segregation consisting of the main box and
the segregating cover.
•
Up to 4 screw-in shielded terminals per phase, as
well as space for the corresponding incoming power
cables.
•
Clamp flanges for the medium voltage cables.
•
Grounding bars.
•
Toroidal current transformers.
•
Plug-in voltage transformers.
•
Surge arresters.
All the elements making up the enclosure are grounded by
means of a conductor consisting of a copper bar capable of
withstanding the rated short-time current. It is located in the
base in such a way that it does not need to be dismantled
in order to insert or remove a cable and its corresponding
termination.
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