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Патент USA US2109850

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March 1, 1938.
L. J. SAUDICOEUR
2,109,850
HIGH TENSION FUSE WITH HIGH RUPTURING POWER
Filed March 27, 1935
" _J0zzz£r Z022
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Patented Mar. 1, 1938 '
_~ 2,109,850
UNITED STATES
PATENT OFFICE
2,109,850
HIGH TENSION FUSE WITH HIGH RUPTUR
INGP OWER
Louis Joseph Saudicoenr, ‘Villeurbanne, France,
assignor to Ateliers de ‘Constructions Elec
triques de Belle, Paris, France
Application March 27, 1935, Serial No. 13,250
In Germany May 8, 1933
2 Claims.
Safety fuses are known for operation at high
tensions having a high rupturing power com
prising essentially a fusible wire disposed within
a cylinder of insulating material ?lled with a
5 substance which is electrically inert. Such de
vices have the following disadvantages. The
fusible wire of very small diameter subjected to
high voltage becomes luminous due to the produc
tion of corona discharges, oxidizes and deterio
10 rates. Moreover if the interruption of heavy cur
rents may to a certain extent be suitably effected,
it is not the same with currents of small in‘
tensity which cannot be interrupted.
The present invention permits of completely
15 overcoming these disadvantages. It has for its
object a high tension safety fuse comprising a
fusible wire- disposed in an insulating cylinder
(Cl. 200-130)
this purpose the fusible wire may be passed into
the interior of the glass tube which contains only
air and it is held straight in this part of "its
length.
'
The winding in a helix of the fusible wire
permits of avoiding corona discharges. On the
other hand the covering of varnish or insulating
material prevents the oxidation of this wire. A
glow discharge is avoided over the lower straight
part of the wire by metallizing the outer, inner 10
or both walls of the cylinder 3 as shown exagger
ated at 5. “ Such an arrangement becomes in
effect the same as enclosing the straight wire
in a Faraday cage.
The arrangement describedv permits of com 15
pletely avoiding deterioration of the fusible wire _
by corona discharge and of interrupting the
whole range of currents from the weakest to the
characterized in that the fusible wire is covered maximum currents guaranteed.
Having now particularly described and ascer
20 with insulating varnish or other insulating ma
terial ful?lling the same object and is in part ' tained the nature of my said invention and in
_ containing an electrically inert material and is
wound in a helix on an insulating support en
what manner the same is to be performed,‘ I de
closed or embedded in the inert material, the
clare that what I claim is:
remainder of the wire being disposed in the part
1. In a high-tension high-power cartridge
fuse having an elongated body, a tubular support
of insulating material disposed substantially con
centrically within the body and extending the full
length thereof; and a uniform-section continu
25 of the cylinder containing only air or inert ma
terial in such manner as not to contact with
the said insulating support. Other characteris
tics will appear from the following description
of the invention.
to
_
The accompanying drawing illustrates dia
-
.
>
ous fusible wire having a part wound upon said
fuse constructed in accordance with the inven
support and a part within said support, whereby 30
said wire is adapted to start fusing at one
extremity and continue melting to the other
tion.
extremity thereof.
_ grammatically in elevation partly in section a
'
,
The fusible wire is denoted by I. It is disposed
35 on an insulating support constituted by a glass
tube 2. The whole is enclosed in a cylinder 3
containing an inert material consisting of sand
or like material. This material is held in the cyl
inder by caps 5 which may either seal it her-'
40 metically or permit communication with the ex
terior through the medium of perforated plates 1
'
2. In a high-tension high-power cartridge
fuse'having a cylindrical ‘body permeable to gases
created therein, an insulating tubular support
permanently disposed inside‘ the body and ex
tending the whole length thereof, and a continu
ous uniform-section fusible wire partly wound
over a portion of the support and partly ex 40
tended within the remaining portion of the tubu-v
or the like.
In accordance with the invention the wire I is
covered with varnish or insulating material and
lar support concentrically and parallel thereto
through an aperture provided in said support,
45 woundlnahelixoverpartofitslengthonthe
glasstubei; theremainderofthewireisspaced
from the glass andstretched'inthe air. For
cally it starts melting at one extremity and keeps
on melting it to the other extremity.
whereby when said wire is overloaded electri
LOUIS JOSEPH SAUDICOEUR.
45
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