US1667510A - Electric conductor - Google Patents

Description

April 24, 1928.

J. R. COE

ELECTRIC CONDUCTOR Filed July 1924 INVENTOR J AM E5 R. C 06.

BY /%M ATTORNEY,

Patented Apr. 24, 1928.

- "UNITED STATES PATENT OFF-ICE.

JAMES ROBERT ODE, OF WATERTOWN, CONNECTICUT, ASSIGNOR TO THE AMERICAN "BRASS COMPANY, OF WATERBUR-Y, CONNECTICUT, A CORPORATION OF CONNECTI- iil ii i'nveriti 'on ielates to electric power transmission conductors, and has special reference tof'aferial electric conductors that are I'l .:.3 particularly adapted for high tension transl l \lSl0 I 1 Conductors of this type are usually iriii'ided with a core, and with one or more lay crs wire cabled or spirally wound sid'eb e-uponthe core. In cables of this type; at' present' general Commercial use, a soliil 'core ofc'opper or other conducting netalfis employed. but it, has been found becaii's flollthegsma-ll diameter of the conductor necessary fora gi\ 'en'amperage, when a core of thiscliarac'tei is employed, that at gh v" l tage tlig'ere b'ccurs a substantial leakfago-of enigy-tromfthe conductor due to "is i-know 'i the corona effect. This ggrgnagifegt.decreasesias the d ametenof tne ,cond 'ctor mncrtea 'e Accordingly, it hasbeen 'prot'iosed to, make ,the core of hollow (-onst ructiomso jitop'e'rmit the stranded conductor'to be made of considerably greater diameter than such conductors provided with a solid conducting core for the same resistance per unit of length. Such hollow cores, however, have various objections which are overcome by my improved construction.

The principal object of the present invention is to provide a new and improved electrical conductor of the character indicated which has all of the advantages of the prior constructions. as above described. while doing away with the disadvantages.

The following is a description of a preferred embodiment of my invention, reference being had to the accompanying drawings. in which,

Figure 1 is a sideelevation of a portion of a stranded aerial conductor embodying mv invention, portions of the spirally wound wires at one end being indicated by dotted lines;

Fig. 2 is a transverse sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a diagrammatical view illustrating the relative positions of the component parts of the core of the stranded conductor when the conductor is bent;

Fig. 4 is a side elevation showing a moditied form of core, the wires cabled about the core being shown diagrammatically; and

Fig. 5 is a sectional view taken on the line 5-5, of Fig. 4.

The electric conductor illustrated in Figs.

ELECTRIC CONDUCTOR.-

Application filed July so, 1924. Serial so. 728,998.

1,'2and 3 of the drawings is provided with a core comprising'a plurality of short barrelshaped blocks .2 arranged end to end, a layer of solidwires '4 cabled "about the core in. one direction side by side so "as to contact with each ithei'fand'a second layer of solid wires 6 cabled side by'side about th'e' core in the 0p- .posite direction." The blocks 2 are-preferablyinade of'wood,'biit may also'be made of .gla'ss, porcelain f or other suitable material. When made 'O fLviood they afford s'ufiicient support and 'iiie'relzitivfely light' in weight. Each'fi'n'e'mbe'r 'has asubstantial cylindrical su'rfac'e 'which" is =ci1rvedlongitutdiiia'lly -in an":a rc having its center in a plan's at "right angle to the axis of the memberandmidwayof its ends', thelength-of the radiuslof the arc'efiec'ting 'to 'some extent the degree of flexibility 'of the com 'leted gcdnductor, as will be hereinafter described; A six inch radius is 'siiitablformbstpurposes where the'blocks' 'are' five eigh'ths of an inch in diameter. The ends of the blocks 2 are chamfered or rounded to provide tapering end surfaces 8. The wires 4 and (3 are made of copper, bronze, aluminum or other metal of high electrical conductivity, and when of cupreous material are preferably hard drawn.

lVith this construction of conductor it will be apparent that it may be made of any desired diameter for a given high voltage, so as to reduce to a minimum the corona leakage; and at the same time it is of light weight, low cost, and has a much less tendency to crushing or distortion than conductors having a tubular hollow core. It will also be apparent that by constructing the blocks 2, as above described, the completed conductor will be of the desired degree of flexibility, and the slight longitudinal curvature of the blocks provides an effective support at relatively short intervals for the layers of cabled wire. Fig. 3 shows the cable bent in a short radius, the longitudinal curvature of the blocks determining the degree of abruptness of the bending. It will be apparent that by decreasing the radius of the arc of the longitudinal curvature of the blocks that the flexibility of the conductor may be increased, and vice versa.

Instead of the blocks 2 being made solid as above described. they mav when made of metal or glass, each be hollow with fairly thick walls so as to be rigid as shown in Fig. 5 and may be provided with an axial aperture, and when thus constructed may be st rung upon a wire or other flexible member 10 as shown in Figs. 4 and 5. the blocks being indicated in these figures at 2', and the two layersof wire at 4' and ti. This latter con- Struction provides a lighter core and a simple means of assembling the rigid blocks and holding them in position during the cabling operations.

As will be evident to those ski led in the art, my invention permits of various modifications without departing from the spirit thereof or the scope of the appended claims.

W'hatI claim is:

1. A cable constituting an electrical eonductor for high tens-ion transmission lines having, in combination, a core-comprising a plurality of short rigid members arranged end. to end, and contacting wires of high electrical conductivity arranged spirally and side by side about said members.

2. A cable constituting an electrical conductor for high tension transmission lines .hauing, in combination. a core comprising a plurality of short. substantially cylindrical members arranged endwise and contacting wires arranged spirally and side by side about said members and of high electrical conductivity.

3. A cable constituting an electrical conductor for high tension transmission lines :131. in minimization. a core comprising a plurality oi members arranged endwise and each having its exterior surface substantiallv 'J .ili.tll'i(':!i and curved longitudinally in an having its center in a plane substantially .i light angles to the axis of the member extending substantially through the center thereof and contacting wires wound spirally there n.

1'. A cable constituting an electrical condurtmfor high tension transmission lines having, in combination, a core comprising a min-aheaof barrel-shaped members arranged end to end, and contacting wires arranged spiraliy about said members and of high elect cal conductivity.

it A cable constituting an electrical condu.-,-t -r for high tension transmission lines havii in con'iliination, a core comprising a plurality of members having axial apertures, and a flexible member upon which said memhers are strung, and contacting Wires o'f'liigh electricai conductivit arranged-spirally side hr side and surrounding said members.

(3. A eabie constituting an electrical coudurtoifor high tension transmission lines having in combination, a core comprising a plurality of short substantially cylindrical members having their ends tapering and arranged end to end,.-and contacting Wiresarranged spirally about said members and of high electrical conductivity, v 1

JAMES ROBERT COE.

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