Note: Descriptions are shown in the official language in which they were submitted.
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Back~round of the Invention
This invention relates to three-phase tap-chang1ng switching
devices. Such switching devices are generally oil imrnersed.
They are affixed by a flanged member to the oil tank of a trans-
former which is provided with a similar flanged member. Both
flanged members are adapted to cooperate and to provide passage-
ways for conductively interconnecting the tap-changing swit~hing
device with the transformer whose winding is, or whose windings
are, tapped. In such a composite device including a tapped trans-
former winding under oil, and a switching device which is oilimmersed, the body of oil of the transformer must be separate
from the body of oil of the switching device since the latter
is gradually co~taminated by products of arcing. The separation
~, o~ the oil space of the transformer from that of the switching
device is generally effected by an insulating plate arranged
between the oil tank of the transformer and the oil tank housing
the switchiQg device- The insulating plate is affixed to the
aforementioned flanged member of the oil tank of the switching
device~ It forms part of a bushi~g structure for interconnecting
the tra~sformer a~d the switching device. The insulating plate
for separating the body of oil of a transformer ~rom the body of
oil of a switching device must meet high standards. It must be
mechanically strong, oil-tight, and have a high dielectric
strength to avoid electrical breakdowns between adjacent con-
ductors. To this end the insulating plates separating the oil
; spaces o~ the transformer and o~ the switching device may be
provided with collars surrounding the terminal members thereo~O
The separation of the body of oil of the transformer and the
body of oil of the tap-changing switching device is more fully
30 described in U.S.Patent 3,805,205 to Alexander Bleibtreu ~or
MEANS FOR SEPARATING THE BODY OF OIL OF A TRANSFORMER AND THE
~ BODY OF OI~ OF A TAP-C~ANGING SWITCH, issued on April 16,19740
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Reference may ~e had to this patent in regard to the prior art
to be superseded by the present invention.
Summar~__f the_Invention
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According to this invention the prior art insulating plate
is dispensed with. The tap-changing switching device includes
an oil-tight substantially cylindrical sub-housing effecting
a separation of the oil space of the transformer from the oil
space of the switching device. Said sub-housing is arranged
within a housing proper having a flanged lateral opening that
containS a lattice structure supporting the ends of conductors
conductively interconnecting said transformer and the terminals
of said swi~ching device.
Brief Description of the Drawings
Fig.l is a schemati~ slde elevation of a three-phase tap-
changing switehing device according to the present invention;
Figo2 is substantially an end view of the structure of Fig.l
seen in the direction of the arrow R; and -;
Fig.3 is a schematic horizontal section of the structure
shown in Fig. lo
Descrip~ion of Preferred Embodiment
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As shown in the drawi~gs, the switching device is enclosed in
a~ oil-tight cylindrical sub-housiag 3 which, in turn, is -
arranged i~ a housing 1 proper which is semi-cylindrical,
ousing 1 is provided with a flanged lateral opening 2 co-
operating with the flanged lateral opening 7 in the trans~ormer
tankO Su~-housing 3 contains the tap-changing switching device ~ --
which may be designed substantially as disclosed in U.S.PateQt
3,67I,687 to Alexander Bleibtreu for TRANSFER SWITCH FOR TAP-
CiHANGING REGULATING TRANSFOi~MERS INCLUDING LOST MOTION INTER~
CONNECTION DRIVING MECi~i~NISM, issued Ju~e ~0,1972, or in U.S.
Patent 3,739,111 to Georg Wittenzeller et al for TRANSFER
SWITCH FOR TAP-CH~NGING REGULATING TRANSFORMERS WITH IMPROVED ~ ~.
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CONTACT STP~UCTU~E~ issued June 12,19730 The tap-changing
switching device enclosed in sub-housing 3 Is attached to a
switch head 4 which, in turn, is suspended in housing 1. Re-
~erence numeral 5 has been applied to indicate a motor drive
af~ixed by a flange to housing 1. The drive gear for operating
the tap-changing switching device has not been shown in the
drawing, except for a coupling 6 interposed between motor drive
5 and switch head 4, since such drive gears are well known in
the artO
The opening 2 in the flanged portion of tank 1 and the
~; opening 7 in the flanged portion of the transformer tank are o~
equal size and register when housing 1 is aEfixed to the trans-
former tank~ The opening 2 in housing 1 proper contains a
lattice struc~ure including three horizontal cable supports 8.
The lattice structure supports the ends of conductors or cables
conductively intercon~ecting the transformer and the tap-
changi~g switching device inside of sub-housing 3. The lattice
structure inside of opening 2 includes three horizontal cable
- : supports, one for each o the three phases, Each cable support 8
is provided with a plurality of notches 10 for receiving cables
conductively interconnecting the transformer and the stationary
- terminals 9 of the switching device inside o~ sub-housing 30
. Cables 12 connected to terminals 9 are inserted lnto notches 10.
Reference numerals 11 have beeo applied to indicate the ends of
cables 12 projecting beyond supports 80 These ends are in-
sulated and provided with squashed sleeve members 13 receiving
the ends of the corresponding cables coming from the transformerO
This makes it possible to conductively connect cables 12 with
. corresponding cables c~ing from the transformer by simple
squashing operations of sleeve members 13.
. The switching device inside of oil-tight sub-housing 3 may
be suppor~ed, as mentioned above, by switch head 4, which is
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the conventional way of support.ing the switching device. As
an alternative, the bottom 14 o~ houslng 1 may be provided with
an opening 15 and support s.ub-housing 3. Opening 15 may be
normally closed by a cover 16. This facilitates the maintenance
of the tap-changing switch, which may be rendered accessible
from the bottom as well as from the top of the switch structure~
We claim as our invention:
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