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Патент USA US2408409

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'oét; I; 1946.
Filed March 9, 1944
///// / /I
?sh/6y PBOCK.
Patented Oct. 1, 1946
Ashley P. Bock, Catonville, Md., assignor to West
inghouse Electric Corporation, East Pittsburgh.
Pa., a corporation of Pennsylvania
Application March 9, 1944, Serial No. 525,688
5 Claims.
My invention generally relates to a physical
construction for electric transmission lines of a
type comprising a hollow relatively outer con
ductor and an inner conductor insulatedly sup
ported centrally inside of the outer conductor,
usually axially thereof; but my invention more
speci?cally relates to providing a concentric or
co-axial transmission line or cable capable of
(01. 174—28)
Referring to Figs. 1 to 3, my invention is shown
embodied in a portion of a transmission line com-'
prising an elongated hollow outer conductor 2, an
elongated tubular inner conductor 4, and a plu
rality of insulating support means for support
ing the inner conductor concentrically inside the
outer conductor, each of the insulating support
means being indicated in its entirety by the ref
transmitting alternating current of voltages and
erence numeral 6. The conductors comprise one
powers higher than that carried by conventional 10 or more sections of a circular metal pipe, with
lines of the same general type, including those
the inner conductor 4 having a transverse outer
that rely upon insulating washers for support
which is considerably smaller than, but
ing and spacing the inner conductor.
geometrically similar to, the transverse inner pe
An important object of my invention is to pro
vide a construction for a concentric transmission
riphery of the outer conductor 2. Associated with
each insulating supporting means 6 is a lower
hole 8 and a diametrically opposite upper hole
in in the otherwise circumferentially solid tubu
line having a substantial support for the inner
conductor, which provides a longer and narrower
insulation or creepage path therealong, between
lar wall l2 of the outer conductor 2.
the two conductors, so as to decrease the pos
Each insulating support means 6 comprises an
sibility of breakdowns and ?ashovers.
insulator I4 passing through and clearing the
A further object of my invention is to pro 20 edges of the Wall I2 at the lower hole 8; the in
vide a transmission line of the type described for
sulator having an inner end [6 which is used to
carrying high voltage alternating current at rel
the position of the portion of the inner con
atively high power with comparatively low leak
ductor which it contacts, and an outer end I8
age losses.
at a signi?cant distance outwardly from the
Still another object of my invention is to pro 25 outer conductor 2. The extreme outer portion
vide a transmission line of the type described
of the outer end l8 of the insulator is ?xed, or
for carrying high voltage, high power alternat
cemented, in a short seat or socket 20 of a metal
ing current at high frequencies, including those
plate 22 having a base 24 provided with aper
obtainable only through resonant-circuit tube 30 tures 26 on each side of the insulator l4, spaced
oscillator power sources.
therefrom. These apertures receive elongated
It is a general object of my invention to pro
vide a transmission line of a type described which
can be quickly and accurately manufactured and
assembled, and which is sturdy in construction.
Still another object of my invention is to pro
vide a transmission line of the type described
bolts 28 which pass ‘through a pair of apertures
30 in the outer conductor 2 on opposite sides
of the lower hole 8. The apertures 26 and the
associated apertures 30 are preferably spaced
the same distance apart. In the embodiment
disclosed two apertures are provided in the plate
comprising an outer tubular conductor and an
22 and two associated apertures in the outer con
inner conductor which is accurately maintained
ductor 2 for each insulating support means 6.
concentrically therein, at various spaced points 40 Spacers 32 either metal or insulating tubes, de
if necessary, by an easily applied means capable
pending on cost and on physical and electri
of being easily repaired or replaced.
cal requirements, encompass each bolt ‘for ?x
Further advantages, features and details of
ing the distance between the plate 22 and the
my invention will be discernible from the follow
nearest points of the outer conductor 2. Nuts
ing description thereof which is to be taken in Ali) 34 are tightenable on the bolts 28 for securing
conjunction with the accompanying drawing. In
the drawing:
the plate 22 against the spacers 32.
For fastening the inner conductor 4 to the
Figure 1 is a longitudinal view, partly in ele
inner end l6 of the insulator, the latter may be
vation and partly in section, of a part of a trans
provided with a pair of threaded holes for re
mission line embodying my invention;
50 ceiving a small clamping means which closely
Fig. 2 is a transverse view, partly in section,
surrounds the inner conductor 13. and comprises
with parts broken away, of the transmission line;
a pair of screws 36 passing through a clamping
Fig. 3 is a sectional view taken along the line
bar 38, the screws being tightenable in the thread
III-III of Fig. 1;
ed holes of the insulator. The upper hole I6
Fig. 4 is a view, similar to Fig. 1, showing a " permits ready access to the screws 36.
modi?cation provided with closure caps for clos
Obviously, by controlling the dimensions of
ing the holes in the outer conductor; and
the lower hole, the insulator, the base plate and
Fig. 5 is a transverse view, partly in section,
the spacers, the inner conductor can be accurate
of a modi?ed form of a transmission line em
ly positioned inside the outer conductor. If for
bodying my invention.
60 any reason an insulator should fail, become de
fective or otherwise require replacement, all that
is necessary for repair is to loosen and remove
ductor is made hollow it may be liquid cooled
.ior carrying high values of current.v
the screws 33 and clamping 'bar 38 and then
loosen the nuts 34 of the bolts 28 so that a plate
22 with a defective insulator thereon can be
replaced with another plate and insulator; al
though it is obvious that the insulator 1B can
be screw ?tted or otherwise replaceably secured
in the socket 20, if desired.
The bolts 28 and the spacers 32 can be made
of any desired length. For placing long bolts in
' ‘While I have described my invention'in forms
which I now prefer, it is obvious that many modi
ing diameters which were, respectively, 11/2 inch,
1% inch and '1 inch; the insulated length of the
having a hole in its tubular well, an inner tubu
lar conductor spanning said hole, means for sup
and position the insulator, and the location of
3. A concentric electric transmission line com
for receiving the bolts, are optional, depending,
sometimes, on the degree of rigidity desired.
ductor having a hole in its tubular wall, an elon
?cations and different embodiments may be made
utilizing the principles and teaching of my in
'I claim as my invention:
1. An alternating-current transmission line
comprising an outer hollow tubular conductor
having a hole in its tubular wall, an inner tubu
lar conductor spanning said hole, means for sup
position, if they cannot be passed upwardly
porting said inner conductor inside and insulated
through the lower hole 8 or downwardly through
‘from .said outer conductor, said means compris
the upper hole III, the apertures 30 in outer con
ing an insulator device passing through and
ductor 2 can be made in the form of slots open
clearing said hole, means for securing an outer
ing at the lower hole 3, or the heads of the bolts
end of said insulator .device to ‘said outer con
maybe separate nuts screwable on ‘the associated
ductor, said insulator device having an'inner end
ends of the ‘bolts.
at said inner conductor, and clamping means on
As illustrative only of my invention, and not
by way of limitation, a practical embodiment of 20 said inner insulator end, for securing and posi~
tioning the portion of said inner conductor asso
my invention which carried 400 kw. at a voltage
ciated therewith, said clamping means compris7
of '7.,'500 volts and a frequency of 150,000 cycles
ing a clamping member releasably clamping the
comprised an outer conductor of 4 inch copper
conductor to said insulator device.
pipe, and an inner conductor of % inch copper
2. An alternating-current transmission line
pipe. The upper ‘hole, the lower hole and the 25
comprising an outer hollow tubular conductor
insulator were on a common line of centers, hav
porting said inner conductor inside and insulated
insulator, between the inner conductor 4 and
the plate 22, being 5 inches. This means, of 30 from said outer conductor, said means compris
ing an insulator device passing through and
course, that the insulator cleared the lower hole
clearing said hole,,means for securing an outer
by about 3A; of an inch around its circumference
end of said insulator device to said outer con
and that the minimum creepage distance from
ductor, said insulator device having an inner end
the inner conductor, at one potential, to the
other conductor, at a different potential, was 35 at said inner conductor, and means for relatively
about '5 inches along the surface of the insulator. ‘ ?xing together said inner end of said. insulator
device and the portion of said inner conductor
The number of and spacing between insulating
associated therewith; the last said means com
support means is obviously optional, but may,
prising a releasable part attached to Said insu
in some cases, be dependent upon the required
electrical characteristics of the transmission line. 40 lator device operable for releasing said insulator
My invention has been applied to lines in excess - device from said inner conductor, said outer
conductor having a hole in proximity to said re
of 25 feet in .length. Similarly the number of
leasable part for permitting access thereto.
securing bolts, such as bolts 28, which secure
the apertures, such as 39, in the outer conductor 45 prising an elongated outer hollow tubular con
gated inner conductor spanning said hole, ~an
insulator means projecting through said hole, a
If desired the lower holes 8 and the upper holes
band secured to said outer conductor for support
l0 may be provided with a metallic cup or cover
so that the electrical ?elds are substantially en 50 ing said insulator means, the inner end of said
insulator means being at said inner conductor,
tirely con?ned inside the outer conductor. Fig.
and means for securing said inner end to said
4 .shows caps 40 and 42 applied for covering the
inner conductor. ’
upper‘ and lower holes, the lower cap encompass
4. A concentric electric transmission line com
ing theinsulating supporting means.
an elongated outer hollow tubular con‘
Fig. 5 shows afurther modi?cation which does 55
ductor having a hole in its tubular wall, an elon
not require an upper hole. In this embodiment
gated inner conductor spanning said hole, an
the insulating ‘supporting means comprises a stiff
insulator extending through and clearing said
narrow bracket band shaped and detachably, or
hole, having an end at said inner conductor and
otherwise, fastened to a convenient place on the
outer conductor 2, the bracket band having a 60 an end outward from said outer conductor, and
means for ‘detachably securing said ends’ of in
depending portion comprising legs 52 and a con
to said ‘conductors for insulatedly sup
necting base-‘bar 54 to which the plate 22 may
porting said inner conductor inside said outer
be detachably secured. Fig. 5 further di?ers from
conductor, said means comprising separable
the prior embodiment in utilizing a clip 55 which
on the inner end of said insulator.
snaps on and o? the inner conductor 4.
5. The invention ofjclaim '2 characterized by
Because of the increased insulating distance
including a metallic cap for the last said hole,
along the insulating support means 6 for the in
said cap generally following the shape of said
ner conductor of the transmission line built in
outer conductor. "
accordance with my invention, the use of inert
gases, with gastight seals, ‘is not necessary for
providing adequate insulation. If the inner con
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