Note: Descriptions are shown in the official language in which they were submitted.
2 1 727q2
A METHOD OF ARRANGING HOLDING FLANGES AND HOLDING
FLANGES ARRANGED IN ACCORDANCE WITH THE METHOD
TECHNICAL FIELD
The present invention relates to a method of arranging holding
flanges on an electromagnetic unit, for instance on capacitor
voltage transformers, and to holding flanges arranged in accor-
dance with the method.
BACKGROUND ART
Holding flanges, or press flanges, hitherto used with electromag-
netic units of capacitor voltage transformers normally comprise
eight differently configured parts, which function to fixate and
hold together the transformer core with the aid of screw joints,
and to shield the sharp corners of the core. The flanges may be
provided with holes for lifting and lowering the unit when
fitting and removing the same respectively.
SUMMARY OF THE INVENTION
In order to simplify the manufacture of electromagnetic units
provided with iron cores, coils and holding flanges and to
facilitate fitting of said units to capacitor voltage transform-
ers, the present invention proposes the use of holding flanges
which consist solely of three pairs of mutually different plate-
metal holding flange parts which together are able to form an
electromagnetic unit together with screw joints, the iron core
and the coil. In addition to fixating, holding together and
shielding the transformer core, the holding-flanges also provide
means for supporting a complete unit prior to fitting the same,
means for the attachment of a damping circuit, means for adjust-
ing the unit when mounted in an oil box, means for guiding a unit
in the oil box when mounting said unit in said box, means for the
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attachment of a compensating reactor, and attachment means to
facilitate lifting of the entire unit and for earthing all parts
that are to be earthed. The aforesaid three pairs of differently
configured metal-plate flange-parts may be arranged in pairs in
mirror image to one another, and used in the manufacture of an
electromagnetic unit together with core and coil.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 illustrates the six mutually different flange-parts
according to the invention from above.
Figure 2 illustrates from above the flange-parts when assembled
in accordance with the invention.
Figure 3 is a side view of the six mutually different flange-
parts according to the invention.
Figure 4 is a side view of the flange-parts when assembled in
accordance with the invention.
Figure 5 illustrates from above the assembled flange-parts
together with other equipment in a capacitor voltage transformer.
Figure 6 is a side view of the capacitor voltage transformer of
Figure 5 and shows flange-parts and other equipment.
DESCRIPTION OF AN ~x~ ~LIFYING EMBODIMENT
Figures 1-4 illustrate the configuration and the assembly of the
various holding-flange parts. The holding flanges consist of
three different pairs of metal-plate parts which are arranged in
pairs to form together a holding and supporting casing for an
iron core and coil. The flange-parts 1, 2 of one pair are
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mutually identical and face towards one another and are intended
to be placed diagonally around the core. The flange-parts 3 and
4 of another pair are also mutually identical and face towards
one another when placed diagonally around the core, wherein the
flange-parts 1 and 3 and the flange-parts 2 and 4 are configured,
or designed, so that when fitted they will together act as a
smooth earth plane around a fitted winding, such as a high
voltage winding on part of the iron core. The flange-parts 1-4
also include lifting holes 5 and attachment holes for the
attachment of a damping coil, for instance. The flange-parts 1-4
are provided with guide cylinders 6 to facilitate fitting and
fastening of the flange-parts to the assembled iron core, coil
and other equipment in a box, said guide cylinders or sleeves
coacting with corresponding guiding and fastening rods 27
provided in the bottom of said box in mounting and securing the
iron core, coil and other equipment. The flange-parts 1-4 also
include outwardly angled flange surfaces 7, 8 which are provided
with upper and lower holes 9, 10 by means of which the flange-
parts hold together and fixate the iron core and coil together
through the medium of screw joints 11, 12. The third pair of
flange-parts 13, 14 are mutually identical and provided with an
upper planar part 15 and a lower generally planar part 16 which
is angled down from the planar part 15. The upper planar parts 15
are provided with holes 17 which are disposed to enable the
flange-parts 13, 14 to be connected to the flange-parts 1-4 with
the aid of the earlier mentioned guide and fastening rods 27.
Holes 18 are provided to enable the flange-parts 13, 14 to be
connected to the flange-parts 1-4 through the medium of holes 10
and screw joints 12. When the screw joints 11 and 12 are fitted
and tightened on the guide and attachment rods 27, the flange-
parts 1-4 and 13-14 will together function as a unit which
fixates and secures the iron core and coil and also support any
other electrical equipment.
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With a starting point from an open iron core held by the flange-
parts 1, 3, 13, 14 in the manufacture of an electromagnetic unit,
a coil is first threaded on one leg of the core. A core part is
placed between the leg of the open iron core and the flange-parts
4 and 2 are then fitted against the flange-parts 13 and 14. When
the flange-parts are correctly positioned, said parts are
connected together with the iron core with the aid of the screw
joints 11 and 12.
Figures 5 and 6 illustrate a unit comprising holding flanges 2,
4, iron core 19, coil 20 and other equipment mounted on the
flanges and lowered into a box 21, which in the illustrated case
may conveniently have the form of a circular container, optional-
ly slightly conical, having an upper, larger openable end. By
providing a trench 22 on the bottom of the container, the bottom
outwardly lying part of the core 19 may be allowed to seat in the
trench and guide rod attachments 23 placed over and on one side
of the trench, therewith enabling the upper planar portions 15 of
the flange-parts 13, 14 to stand on the upper bottom of the box
and simultaneously earthed with a small free space for accommo-
dating transformer oil around the outwardly lying part of the
core. The holes in the flange-parts may be used for the direct
attachment of an attenuating or damping coil 24. The upwardly
facing holes on the flange-parts can be used for the direct
attachment of a damping resistor 25 and also for the attachment
of a compensating reactor 26.
