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Патент USA US2116404

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May 3, 1933~
File-d March 23, 193'?
_ bg M
_His Abborneg.
Patented May' 3, 1938
ELEc'rnlcAL nvnUo'rloN APPARATUS
Vincent M. Montainger, Pittsfield, Mass., assigner .
to General Electric Company, a corporation
of New York
Application March 2_3, 1937, serial No. 132,528
s claims.
(c1. 11s-362)
'I‘he' insulating cylinders Il_,and i5 are imperio
’I'he invention relates to electrical induction ap
and are formed with end flanges il and il
paratus, such as a transformer or reactor, where
in a winding leg of a magnetic core is surrounded respectively which provide insulation between
the ends of the winding and the adjacent yokes`
by a winding or windings. The invention is fur
5 thermore particularly concerned with apparatus I9" of the magnetic core. -Suitable spacing strips
, having high voltage windings of the disk coil type. 20 are provided between the insulating cylinders
Such a high voltage winding must be effectively i4 and I5 and between their flanges i'l and il.
insulated from the winding >leg of the core and
from any low voltage winding which it may sur
l0 round, and suitable provision must be made for
dissipating heat from the winding to prevent ex
'y cessive temperatures. The necessary insulation
is usually provided by one or more insulating cyl
inders between the high voltage windings and the
15 winding leg of the magnetic core. The disk-coils
i forming the high voltage winding are usually
- spaced from each other and from the insulating
In accordance with the inventionv the high
voltage winding I2 includes. a plurality of spaced
disk coils 2| with their inner Iedges in -contact
with the outer surface of the insulating cylinder
i4 which they surround. There is thus no space
for cooling liquid between thesedisk coils 2| and
their insulating cylinder il so that if any corona '
'starts at all it must startin the solid insulating
material of the insulating cylinder Il instead of
cylinder which they surround to provide passage
in an insulating liquid and it is well known that
corona will start much more easily in' liquid- in
corona will ñrst appear and breakdown will first
illm of insulating liquid is much higher in`pro- '
ways for an insulating and cooling liquid in whichv sulation than in solid insulation. It is, however,
theapparatus is immersed. It has been found not necessary that'the disk coils 2| fit so tightly 20
2 that if the voltage_of the winding in such an ar
against the insulating cylinder Il -as to exclude
` rangement is increased to the point of breakdown, all liquid because the dielectric strength of a thin
take place along the inner edges of thedisk coils
D where they are spaced a short distance from the
portion to its thickness than is that of a thicker
layer of such liquid.
insulating cylinder.
The general object of the invention is to pro
vide an improved arrangement of high voltage
winding with its insulating cylinder wherein a
'30 much higher voltage is necessary before corona
and breakdown will occur.
The invention will be better `understood from
the following description taken in connection with
>the accompanying drawing in which Fig. 1 is a
w Gl simple partially diagrammatic view of a core
type transformer having windings which may be
arranged in accordance with the invention; Fig.
2 is an enlarged view of a portion of the trans
. former, the windings in this view being shown
The disk coils 2i are maintained in spaced re
lation by U-shaped spacers 22 and simple spac
ing strips 23. The winding I2 must of 'course be
heldin place‘under considerable pressure and it
is therefore necessary that the spacers 22 and 23
be held in alinement to avoid distortion of the
individual coils 2|. To assure such alinement of
the spacers 22 and 23, the insulating cylinder I4
is formed with longitudinal grooves 24 in its outer
surface and the inner ends- of the spacers extend 35
and fit into these grooves. The spacers 22 extend
along opposite faces of the coils 2| and around
the inner edges where they iit into the grooves
2l. The spacing strips 23 are disposed between
40 partly in section; Fig. 3 is a sectional view on the the U-shaped spacers 22 and their inner ends also
line 2_3 of F18. 2: Fig. 4 shows a detail'on the. extend into the grooves 24. The spacing strips
line 4-4- of Fig. 2. and Fig. 5 shows a modified 22 may of course be of any desired thickness de
pending upon the desired spacing of the coils 2i
form of the invention. Y
,Like'reference characters indicate similar parts
45 of thediiferent figures of the drawing.
' ' '
The transformer shown in the drawing includes
or they may be _omitted if not needed.
The insulating liquid in which the transformer 45
may be immersed will have free access to the
a magnetic core il having two winding legs il upper and lower faces and to the outer edges'of
y »surroundedby high voltage windings I2 and low each of the coils 2l so as to absorb heat from>
` voltage windings-i2, each low voltage winding I2 -these coils to improve the circulation of the
so being next to its winding leg Il and surrounded liquid. To improve the circulation of the
by its high voltagewinding I2. Each high-voltage liquid so that it may carry away the heat more
winding i2 is insulated from its low voltage wind ’ rapidly, alternate coils are formed in two con
ing il by two concentric insulating cylinders Il centric spaced portions so that ducts 2l extend
between the upper and lower surfaces of these al
and Il which are spaced from each other to pro
u lvide a duct or passageway It for a cooling liquid. ternate coils. The cooling liquid may thus flow
into the . space below each of these ducts 2l,
through the duct and out of the winding through
the space above the duct. These ducts 2l should
be as near as possible to the inner edges of the
coils so that the liquid will ilow in contact with
as much as possible of the surfaces ofthe coils.
What I claim as new and desire to secure by
Letters Patent of the United States, is,
l. Electrical induction apparatus including an
insulating cylinder with longitudinal grooves in
its surface, and a plurality of spaced disk coils
in contact- with said surface, alternate coils hav
ing ducts near said cylinder and the other coils
The liquid flows 'of course not only along the
surfaces of those coils which are provided with being solid.
the ducts 25 but also along the surfaces of the
2. Electrical induction apparatus including an
10 other coils not so provided with ducts and which ' insulating vcylinder with longitudinal grooves in
are therefore solid, and thus the heat is dis
its outer surface, and spaced disk coils surround
sipated effectively from all of the coils even ing said cylinder with their inner edges in con
though the cooling liquid is substantially ex-I, tact with the cylinder, alternate coils having
eluded from the inner edges of the coils next to y ducts near their inner edges, and the other coils
cylinder upon which they are sup
In the modified form of the invention shown
in Fig. 5, alternate solid coils are wound. tightly
over the insulating cylinder il and with ~their
being solid.
3. Electrical induction apparatus including an
insulating cylinder with longitudinal grooves in
its outer surface, spaced disk coils surrounding
said cylinder with their inner edges in contact
20 inner edges in contact therewith -T’he ducts 2l
_ with the cylinder, and spacers between said coils
associated with the other coils, however, are
provided by. spacing the inner edges of the other
coils from the cylinder il instead of forming
these ducts through these coils near their inner
25 edges. 'I'he spacing of the inner edges of alter
nate coils from the cylinder Il to provide the
ducts ZI is permissible because of the i'act'that
the adjacent coils are in contact with the in
30 sulating cylinder and definitely establish the po
tential distribution along the cylinder` at .fre
quent intervals so that the voltage across the
ducts 25 will not be sufilcient to produce corona.
'I'he invention has been explained by describ
35 ing and illustrating a particular transformer con
structed in accordance therewith, but it will be
apparent that changes may be made without
departing from the spirit of the invention and
the scope of the appended claims.
and extending into said grooves, alternate coils
having ducts near their inner edges, and the
other coils being solid.
4. Electrical induction apparatus including an
imperforate insulating cylinder, a plurality of 25
spaced disk coils, alternate coils being solid and
each having an edge in contact with the cylinder.
there being a duct associated with each ofthe
other coils and connecting the adjacent spaces
near saidcylinder.
5. Electrical induction apparatus including an
imperforate insulating cylinder, a plurality of
spaced disk coils surrounding said cylinder, alter
nate coils being solid and each having its inner
edge in contact with the cylinder, there being a
duct associated with each of the other coils and
connecting the adjacent spaces near said _cylin
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