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Патент USA US2107973

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Feb. 8, 1938.
A‘ BAJON
ELECTRIC TRANSFORMER FOR HIGH TENSION
Filed Sept. 3, 1935
2,107,973
Patented Feb. 8, 193-8v _
2,107,973
UNITED STATES‘
'
PATENT QFFICE
2,107,973
ELECTRIC TRANSFORMER FOR HIGH
TENSION
'
Adolphe Bajon, Gcntilly, France, asslgnor to
Societe Anonyme "Transformateurs dc Mesure
E. Walter”, Gentilly, France, a corporation of
France
Application September 3, 1935, Serial No. 39,042
.
In France December 29, 182*.
2 Claims.
The present invention relates to electric trans
formers, and chie?y-to, transformers which are
(Cl. 175-356)
not comprise a like enlargement, owing to dim
culties in the insulation.
-
Immediately around this magnetic circuit is
Hitherto-‘the construction of such apparatus ' the low-tension winding C, which is insulated
5 has been attended with di?lculties concerning the from the high-tension winding E-h' an insulat- 5
used for high tension.
'
'
insulation ‘oi the windings from one another or
ing sleeve member I) having an i
'
outer surface arranged coaxially with the mag
lack of symmetry of, the parts to be insulated, ’netic circuit. The inner surface of the high-,
thus making it‘ necessary to give complicated tension winding also has the form of a hollow
inverted cone coaxial with the magnetic circuit. 10
10 forms to'thejinsulating members, to the detri
from ground. These di?lculties are due to the
ment of their‘ dielectric properties.
Various
methods have been considered, up to the present,
for obviating this drawback. The. dimensions
of the magnetic circuit have been increased in
15 order to remove the windings from the unsym
» metrical parts of thislatter. Use has also been
made of a dielectric such as oil, which readily
penetrates between the parts to be insulated and
'
at once adapts itself to the most complex forms.
However, the ?rst method leads to the use of very
aQ
bulky and heavy apparatus which is not con
cement, while the use of oil does not lead to any
great reduction of the sine, and it is always, with
the great volume necessary, a source of serious
2,. danger from ?re.
‘
The present invention has for its object the
construction of a transformer which does not
offer these drawbacks. It is proposed to utilize
‘for this purpose, instead of the closed magnetic
m circuit which is in general use, an open magnetic
' circuit, which is symmetrical with reference to
an axis.
magnetic vcircuit carries windings
separated is’ a condenser type insulating sleeve
having metallic facings which‘are connected to
different points of the windings. The dielectric
of the condenserv further assures the insulation
of the windings from ground.
I
‘.l‘he invention wiil he better understood with
reference to the accompanying drawing’.
‘1,;
ll‘ieure 1 shows a constructional form oi? trans“
i‘crmer of the high-tension type.‘
‘
Figure 2 is a diagram of the arrangement of
the transformer.
m
Figure shows the arrangement of the plates
dug the marinated core of the transformer.
.ieure represents the application oi’ the in»
The insulating member D consists of a con
denser comprising cylindrical metallic facing
parts M, M, which have a parallel position, each
being'connected at the lower end to a different
point N, N' of the high-tension winding E, in 15
order to distribute the differences of potential
of the high-tension winding in the insulating
member.
_
with the facing parts will be better understood 20 "
with reference to Figure 2. In fact, the use of
condensers connected as shown in Figure 2, has
for its object, on the one hand, to compensate
the increase oi.’ current at no load which is due
a cross-section of the magnetic circuit, in order >
to reduce the loss in the iron due to eddy currents.
A It will thus he observed that the construction of 35
this transformer oifers numerous advantages, due
to the combination of a straight open magnetic
circuit, with an insulating member provided with
metallic facing parts, providing units of a con“
denser.
_
a high»
urinal con~
luctance
eight, of
an
or.
hascircuit
,. a ;cylindrical
open
is magnet
very form.
high,
c circuit
an
As en»
_
the some time obtaining"
.
could it he as
'ag'eous to use
. cilltate the
tanner may
insulating
mg, for error
“deed in a cylin u
mater:
"
diameter
,
only slightly greater than that of
larged part
is provided at the ‘base in order
5;, to reduce the reluctance, but the top part can
‘40
in fact, the use cl‘ 2. straight magnetic circuit
facilitates the insulation of the high~tensiorr
winding, by
to the dielectric very simple
form. that of a circular tube, without making
it necessary to increase the dimensions of the 4;;
as of the separates. Thus a solid dielectric
insulat
.
-
to the open magnetic circuit, as the reduction of 25
this current is advantageous, and on the other
hand, to facilitate the distribution, upon the
winding, ‘of surges which may come irom the
exterior, such as may be caused by lightning, or
the like.
30
The core it consists of radial plates arranged
in groups, as shovm in Figure 3, which represents
he used, *
.
‘
Tihe purpose of this insulating member provided
windings,
and this will only require an em emely small
amount of oil.
-
I
55
2
2,107,973
This arrangement is particularly advantageous
in a high-tension transformer, as its general size
is proportional to the tension, whereas in ap
paratus with closed magnetic circuit employing
oil, the size will vary about as the cube of the‘
tension.
The progressive distribution or the di?erences
of potential in the high-tension winding may be
extended to adjacent apparatus. It is particu
the distribution of the tension
ill larly applicable
upon the terminal end of a cable P serving to
supply the transformer, and for this purpose it
is simply necessary to carry out the arrangement
ing base portion adapted to be grounded, a low
voltage winding arranged along the bar-like por
tion of the core, a high voltage winding having
a generally conically shaped interior surface ar
ranged over the low voltage winding, a plurality Cl
of insulated metal cylinders in stepped coaxial
arrangement between the high and low voltage
windings to provide capacity elements of a con
denser, the inner cylinders being of greater
length than the outer cylinders to substantially
?ll the space between the two windings, the area
of the outermost cylinder equalling at least one
half of the area of the innermost cylinder, and
shown in Figure 4-, which represents the possible
all of said cylinders extending beyond the two
connections between the facing parts :1 which
mounted on the cable, and the winding E oi‘
ansforrner.
windings at the upper end thereof and the outer
cylinders projecting beyond the upper end of
measuring
e characteristics
transrcrr :r,of are
ti sasapparatus,
follows: as
no-load current is smali.
accuracy is considerable.
ie of th urrent at no load is
the arrangement of the plat% ‘I the core, as
shown in Figure 3; (c) by the use of condensers
connected as shown in Figure ‘2.
It is shown in the preceding considerations
that on the one hand, this apparatus possesses,
30 in addition to its own advantages, many of those
of transformers with closed magnetic circuits
and has few or the disadvantages of transformers
with open magnetic circuit, in which the degree
of accuracy can only be a very small fraction
35 of the apparent power absorbed at no load, as
such apparatus has either ‘a very low degree‘ of
accuracy or a very large current at no load.
I claim:
_'
1. In an electrical high tension vsupport type
40 transformer, an open magnetic clrcuit‘dron core
having a bar-like vertical portion and alsupport
said core.
2. In an electrical high tension support type
transformer, an open magnetic circuit iron core
having 5. her-like vertical portion and an en~
iarged supporting base portion adapted to be
grounded, a low‘ voltace w ‘ring arranged along
the bar-like portion of the core, a high voltage
winding having a generally sonically shaped in
terior surface arranged over the low voltage
winding, a plurality or insulated metal cylinders
in stepped coaxial arrangement between the h‘gh
and low voltage windings to provide capalty
elements-of a condenser, the inner cylinders be
ing of greater length than the outer cylinders 30
to substantially fill the space between the two
windings, the area of the outermost cylinder
equalling at least one-half the area of the inner
most cylinder, all of said cylinders extending
beyond the two windings at the upper end there
of and the outer cylinders projecting beyond the
upper end of said core, and the successive outer
cylinders projecting beyond each preceding inrcr
cylinder.
'
ADOLPHE BAJOF'
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