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Патент USA US2411325

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NOV- 19, 1946,
2,411,325
H. c. GlLLESPlE
CONTROL OF ELECTRICAL ARCS
Filed July 9, 1943
— -o
TUNING
SYSTEM
T0 RAD/0 .
TRANSMITTER
-0
i?
HIGH VOLTAGE FUSE .
T0 TRANSMITTER~
T0 +5 SUPPLY
IN VEN TOR.
HENDERSON C’. GILLES/WE
ATTORNEY
Patented Nov. 19, 1946
2,411,325
UNITED STATES PATENT OFFICE
2,411,325
CONTROL OF ELECTRICAL ARCS
Henderson C. Gillespie, Moorestown, N. J., assign
or to Radio Corporation of America, a corpora
tion of Delaware
Application July 9, 1943, Serial No. 494,049
6 Claims.
(Cl. 315-111)
2
This invention relates to a new and useful sys
tem of ‘control of electrical arcs and is particu
breakdown to the transmitter. According to my
larly adapted to rapidly extinguish arcs such
I have found that by employing an external
source of rapidly expanding gases (in contrast
to the self-contained fuses employed in the sec
ond system mentioned) more positive interrup
tions can be had, with the control of direction
invention this defect can be overcome.
as frequently occur in the operation of radio
transmitters.
An object of this invention is to provide an
improved system for the control of an electric
power are which frequently occurs during periods
of thunderstorms, such arcs being caused by at
mospheric lightning discharges.
Another object of this invention is to provide
a system using a source of rapidly expanding
gases to control the direction of an arc discharge
of the blast as well.
10
This invention will best be understood by re~
ferring to the accompanying drawing in which:
Fig. 1 shows the arrangement of an explosive
charge placed adjacent an antenna horn gap, and
Fig. 2 shows the arrangement of this inven
and positive interruption thereof.
tion wherein the explosive charge is located near
A feature of this invention is the use of an 15 by a high voltage fuse.
explosive charge located near the horn gap where
Referring now in detail to Fig, 1 of the draw
electrical discharge occurs.
ing, a tuning system I which connects to a radio
Another feature of this invention is a modi
transmitter (not shown) is shown as having its
?cation whereby an explosive charge is located
antenna terminal 2 connected to the usual an
adjacent a high voltage fuse and directed to~
tenna 3 which is supported by base insulator 4.
ward it so as to immediately rupture the arc
Located nearby base insulator I3 and electrically
which normally forms when the fuse melts and
connected to the lead between antenna terminal
automatically reloading the charge by means of
2 and antenna 3 is an antenna horn gap 5, the
energy obtained from the explosive discharge.
lower portion of which is electrically connected
Interruption of high voltages in high power 25 to ground at B. In accordance with this inven
circuits carrying either direct current or high
tion, there is located adjacent the horn gap 5
voltage radio frequency current has always been
an explosive magazine 7 which contains a plural
a problem, particularly such voltages as'occur in
ity of metal shells 8, 8', 8", and 8”’ each hav—
radio transmitting stations where the arc occurs
ing contained therein an explosive charge, the
at the horn gap after a lightning discharge. In 30 sheets of explosive charges being assembled one
the prior art such lightning discharges were fre
above the other in the magazine ‘I and forced
quently extinguished by momentarily shutting
downward by means of a spring 9. The maga
down the radio transmitter. This was accom
zine i’ has two apertures located diametrically
plished by either of two systems. One system was
opposite one another in the lower portion there
by having a photoelectric cell pointed toward the 35 of. The explosive charge 3 rests upon a support
horn gap and connected through suitable relays
member iii of ?reproof material and is located
to the plate supply of the ?nal radio frequency
in such a position relative to the apertures as to
stage so as to interrupt it when a hash occurred
control the direction of the electrical discharge
at the gap. I have found that the response of
and positive rapid interruption thereof by the
certain explosives to an electric discharge, or 40 explosive charge.
light, or heat, provides an automatic actuating
In the operation of this system, when an elec
means that replaces the photocell and associated
trical arc occurs at the horn gap 5, the explosive
relay equipment. By means of my present inven
charge 8 is set off and by its rapidly expanding
tion the complexity of this system can be re
gases immediately extinguishes the arc. The eX
duced.
45 panding gases of the explosive charge passing
The other system, in the operation of a num
through the apertures in magazine 7 at the same
ber of radio transmitters form a single recti?er,
time force a spring tensioned pivoted lever or
provided for the fusing of high voltage direct
trigger member ll having any suitable time de
current connections with self-contained fuses to
lay means (not shown) to move, which immedi~
each transmitter as desired. Fuses have been de 50 ately drops another shell of explosive charge 8’
veloped to accomplish this operation, but it is
in position after a slight time delay on member
found that they suffer from the defect that the
I U to extinguish the next recurring arc discharge.
vaporized fuse wire when it melts causes a me
The modi?cation shown in Fig. 2 is somewhat
tallic coating on nearby insulators. The conduct
similar to that shown in Fig. 1 except that the
ing film on the insulator thus formed causes 55 horn gap 5 is dispensed with, and substituted
2,411,325
3
therefor is a high voltage open fuse [2 which
is electrically connected between the anode posi
tive direct current or B supply of the radio trans
mitter. Located directly below the high voltage
fuse there is a magazine l3 having a plurality
of metal shells I4, M’ and I4" containing ex
plosive charges. A spring l5 keeps the shells of
explosive charges in the proper position and moves ,
4
series between a voltage source and ground, a
magazine having two apertures therein and con
taining a plurality of shells each containing an
explosive charge, means to retain one of said
shells containing an explosive charge in a posi
tion near said gap to be set off by the passage
of an electrical discharge are through said aper
tures, and means to replace another one of said
shells containing an explosive charge in a posi
them upward in magazine [3. A spring tensioned
trigger member [6 is arranged to have its upper 10 tion within said magazine to extinguish a future
occurring discharge arc.
arm bear against fuse If! to release a successive
4. A system for extinguishing an electrical dis
explosive charge in position for extinguishing the
charge arc comprising a high voltage horn gap
next recurring are. In the operation of this de
connected in series between a voltage source and
vice the metal shell Ill containing the explosive
ground, a magazine having two apertures there
charge is arranged to have its explosive discharge
in and containing a plurality of shells each con
directed toward the open wire fuse so as to rup
taining an explosive charge, means to retain one
ture the are which will normally form after the
of said shells containing an explosive chargein
fuse l2 melts. The explosives employed in the
a position near said gap to be set oil by the pas
system of this invention are those which are nor~
sage of an electrical discharge are through said
mally more sensitive to spark discharges, also to
apertures, and means including a pivoted trigger
light and heat. For example gunpowder may be
to replace another one of said shells containing
used for spark discharges, and lead azide for
an explosive charge in a position within said
heat.
magazine to extinguish a future occurring dis
While I have indicated and described a system
for carrying my invention into effect, it will be 25 charge arc.
5. A system for extinguishing an electrical dis
apparent to one skilled in the art that my in
charge are comprising a high voltage horn gap
vention is by no means limited to the particular
connected in series between a voltage source and
devices shown and described, but many modi?
ground, a magazine having two apertures there
cations may be made without departing from the
30 in and containing a plurality of shells each con
scope of my invention.
taining an explosive charge, means including a
What I claim is:
support member of ?reproof material to retain
1. A system for rapidly extinguishing an elec
one of said shells containing explosive charges in
trical discharge arc comprising an Open gap at
position near said gap to be set oil by the pas
which point said discharge arc will occur, a maga
zine containing a plurality of shells each hav 35 sage of an electrical discharge arc through said
apertures, and means to replace another one of
ing a rapidly expanding gas charge contained
said shells containing explosive charges in a po
therein and located adjacent said open gap, said
sition within said magazine to extinguish a fu
magazine having a plurality of apertures in line
ture occurring discharge are having a slight time
with said gap, means to retain one of said shells
delay from a preceding discharge.
containing said charge in a position near said
6. A system for rapidly extinguishing an elec
gap whereby an electrical discharge are will pass
trical discharge are comprising an open gap lo
through the apertures in said magazine and cause
cated at a point where said discharge are will
the charge to be set off and rapidly extinguish the
electrical arc.
,
occur, a magazine containing a plurality of shells
2. A system for rapidly extinguishing an elec
each containing explosive charges, said maga
trical discharge are comprising an open gap at
which point said discharge are will occur, a maga
zine containing a plurality of shells each having
an explosive charge contained therein and lo
zine being located adjacent said open gap and
having a plurality of apertures in line with said
cated adjacent said open gap, said magazine hav
ing a plurality of apertures in line with said gap,
means to retain one of said shells in a position
near said gap whereby an electrical discharge
are will pass through the apertures in said maga
zine and cause the charge to be set off and rap
idly extinguish the electrical arc.
3. A system for extinguishing an electrical dis
charge are comprising a horn gap connected in
gap, means to retain one of said shells in a po
sition near said gap whereby an electrical dis
charge arc will pass through the apertures in said
gap and cause the explosive charge to be set off
and rapidly extinguish the electrical arc, and
means to replace another one of said shells con
taining an explosive charge in a position to ex
55 tinguish a future arc after a slight time delay
of a preceding discharge.
HENDERSON C. GILLESPIE.
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