US2288821A - Subsurface high voltage transmission system - Google Patents

Description

July 7, 1942. w. E. MA'rcHETT SUB-SURFACE HIGH VOLTAGE-TRANSMISSION SYSTEM Filed March 6. 1941 INVENTOR. Mura ZT Myra/fri.'

lv/frz July 7. 1942. A. P. MGCARRQN 2,288,822

APPARTUS FOR VARYING THE POSITION OF A MICROPHONE Filed Nov; 4, 1940 3 Sheets-Sheet 1 l fvuenor: flemndefc Carra/2 2 E3 WMM/Uw three conductors, with their rigidly anchored bushings in transverse alignment, are slightly 'elevated and the lower half of the insulator is slipped thereunder and properly positioned. Thereafter, the upper half of the insulator strucn ture is applied and the locking rings are amxed to the two halves of the 'insulator structure, thereby locking the three conductors in the insulator structure.

The distance between insulators is always such as is found desirable or necessary in order to prevent the conductors from howing or sagging so that these insulators maintain the conductors in insulated relation not only with respect to each other but also with respect to the metallic tubular structure forming a chamber thereabout.

When a suitable length of tubular conduit has been fabricated .with the portions Sit and Sii standing upwardly in the trench and the con" ductors and insulators are included therein, the portions are caused to approach each other un til tlieofnset portion of portion @il laps the :irse edge'portion or tongue Then a suitable welded or soldered joint is eected. between these two portions forming a le .fc-prooi? longitudinal. seam the tubular structure. Successive lengths of 'this tubular structure at their adiacent ends may be suitably secured together in leak-prooi relation or special joint connections of leak-prooi character may be provided if found insulating liquid is supplied to the tubular conduit and the same is then observed for leakage along the ioint represented by the portions 35-3ii and at the joints between sections of the tubular conduit. All leaks, when discovered, are rieh paired. Following the aforesaid, the sections are tested. for their insulated relation as between conductors included in the primary and tubular conduit.

It will be noted, see Fig. 2, that the entire tubular conduit, except for the conductors which are of bare character and the insulators, is entirely iilled with the insulating liquid. This may be what is known as transformer oil or may be purified gasoline, the latter, as previously stated, having a high value so far as insulating properties are concerned. Upon satisfactory testing relative to leakage and electrical insulating the asphaltic mixture 23 is applied as shown in Fig. 2. Then the transmission line is ready for use.

It will, therefore, be readily apparent that the liquid in any length of conduit has free communication through the openings 46,. as well as above the insulators and below the cover portions 33 and 3l and between the insulators, more particularly the portions I thereof and the bottom 30 of the primary conduit. With this construction, the liquid may be maintained in the primary conduit under pressure conditions, thereby insuring that the entire conduit is completely lled from one end of asection to the other or, in other words, from one manhole to another.

The connections between the tubes I9 and 20 with the tubular conduit are not illustratedherein. They, together with the equipment required, are a separate invention.

It will be observed, see Figs. 1 and 2, that the portions 33 and 34 form a slight `arch in cross-section which is sufficient to support the asphaltic material 23 thereabove since such arch tends to resist collapse toward the insulator. As previously stated, the insulators are of form maintaining character with respect to the tubular conduit.

In Fig. 3 there is illustrated a modied form of the invention and the letters A, B and C indicate three bare wire conductors. D indicates the split bushings rigidly mounted on said conductors. These are similar to those previously described land as illustrated in Figs. 1 and 2. The insulator in this embodiment o' the invention includes a main body portion Sil which is enlarged transversely at 'the enis as indicated at 6I. These enlargements fire of substantial-Y ly semi-circular form having the curved surface 62, the space between the two and below the body portion Si@ being designated by letter E. Extending downwardly from the top of the body portion t@ are the three parallel slots each oi which terminates in a semicylindrical hety tom portion The tubular portion of the The flange portions at opposite ends oi each bushing straddle the side faces of the body portion 6d. Thus, the insulator is rigidly associated with the several wires A, B and C. As shown herein, 64 indicates passages through the insulator between the slots $2 to provide for longitudinal communication as aforesaid. The portions Bi, 62 at each upper end extend upwardly of the body portion G0 as illustrated, and thus the conduit form maintaining character of the insulator structure is provided for.

Since gravity operates on the wires at all times, it will be apparent that this type of insulator can be used in substantially all. instances except at the bottom oi a curve in the con-A duit when the `form shown in `Figs. i and 2, preferably, should be used in order to prevent contraction in the Wires incident to change of temperature, that is in cold weather, elevating the 'wires suiciently in or even out of the open slots E2 of the insulator" shown in Fig. 3,` thus permitting the wires to engage the portions 33 and 34 of the tubular primary conduit and short circuit. For al1 normal installations, therefore, the form of the insulator shown in Fig. 3 is equally as eiiicient as that shown in Figs. 1 and 2. That shown in Figs. 1 and 2, preferably, is employed over that shown in Fig. 3 in all the dip portions of the transmission line arrangement.

It will also be obvious with reference to Fig. 3

that the wires and insulator shown therein are mounted in a tubular conduit substantially similar or identical to that shown in Figs. 1 and 2 and that this tubular insulation structure is illled with insulating liquid and maintained in that condition, as previously described, and the same can be mounted in the underground conduit or tunnel, as shown in Fig. 2.

While the invention has been illustrated and described in great detail in the foregoing description,'the same is tobe considered as illustrative and not restrictive in character.

'I'he several modifications described herein, as well as others which will readily suggest themselves to persons skilled in this art, are all considered to be within theV broad scope of the invention, reference being had to the appended claims.

The invention claimed is:

1. In a high tension uid insulated transmission system, the combination with an exceptonally elongated metallic member initially arranged in open-trough formation with upwardly directed side portions adapted for subsequent lateral and inward movement towards each other for top closure formation and to form a conduit of leakproof character, and a plurality of similarly Velongated current conductors laterally presentable to the conduit before the closure thereof is effected, of a plurality of electrical insulating type mechanical spacing means laterally presentable to the conduit before the closure thereof and laterally mountable simultaneously upon the conduit included conductors andv arranged at frequent intervals thereon and in the conduit, each spacing means substantially embracing the conductors and extending transversely across the conduit and engaging the opposite interior surfaces of the side portions for conduit form maintenance and conduit chamber formation between adjacent spacing means, said spacing means having a formation providing substantially free fluid communication between adjacent resulting conduit chambers, each spacing means having sockets such that when said means is mounted on the conductors the latter are spaced apart and spaced from the conduit, and other means laterally and rigidly mounted upon the conductor and cooperating with said insulating spacing means for preventing longitudinal movement of said spacing means upon the conductors.

2. A system as defined by 'claim 1, characterized by each insulation spacing means being of two-part character, each part providing a partial socket for reception of each conductor and each laterally presentable to the conductors, confronting partial sockets forming the sockets for enveloping the conductors, said sockets having contact with the last mentioned preventing means and at opposite ends thereof.

3. A system as dened by claim l, characterized by each insulation spacing means being of two-part character, each part providing a parf tial socket for reception of each conductor and

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