Service Power Technologies
Retrofit solutions for rupture disks
SF6-gas-insulated switchgear EBK-0 and ELK-0
In order to receive the necessary dielectric consistency,
gas-insulated switchgear, depending on design and
manufacturer, are filled with SF6-gas under a pressure of
about 300-700 Pa. An increase in pressure is possible if
an electric arc appears in case of a fault.
In order to avoid an uncontrollable bursting of the
enclosure, the switchgear is equipped with so-called
rupture disks. These serve as a pressure release and
limit the pressure within a certain level which is harmless for the enclosure.
In the 70s, the rupture disks were implemented as graphiterupture disks according to the current state-of-the-art and
independent of manufacturers. If the switchgear reaches its
initial response pressure, the disks will burst before the actual
enclosure is deformed or damaged. The fragments of the
destroyed rupture disk are an unpleasant side effect, which
can possibly result in a hazard for the operating personal that
might be close to the switchgear. And in the course of the
time, it proved that the long-term behavior of the materials
used were not always faultless with regard to pressure tightness, which increasingly resulted in, and still could result in
gas leaks.
Because of the disadvantages mentioned above, switchgear
of later production years were generally equipped with metalrupture disks, which consist of nickel, instead of graphiterupture disks. The metal disks are long-term tight, thus, they
are no longer a serious threat for the operating personal due
to flying fragments.
Hence, ABB has developed so-called retrofit kits, which are
used as a replacement measure of the graphite-rupture disk
from all older series. They adapt the metal-rupture disks,
which are used for new switchgear, for the installation in old
plant. In addition, these retrofit-kits are equipped with moisture filters, which ensure long-term moisture of the SF6-gas
within the ideal range.
−− Customer benefits:
−− Long-term guarantee of the gas quality
−− Increased operator protection
−− Reduced SF6-emission
−− Positive contribution to environmental protection
1 Retrofit solutions for rupture disks | 2 Rupture disk with moisture filter
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For more information please contact:
ABB AG
Power Technologies
P.O. Box 10 03 51
68128 Mannheim, Germany
Phone: +49 (0)621 381-3000
Fax: +49 (0)621 381-2645
E-Mail:[email protected]
www.abb.de/service
DEABB 1812 13 en printed in Germany (02.13)
Note:
We reserve the right to make technical changes or modify the contents of
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