US925561A - Suspension of high-tension lines. - Google Patents

Description

SUSPENSION OF HIGH. TENSION LINES.

.APPLIOATIOK F ILED OUT. 31, 1907.

Patentd June 22, 1909.

|N V\/ ENTERS HARULU W. BUCK.

WITNESSES; f

EDWARD M. HEWLETT. 5 MM mx m.

" certain new and useful Im the number of such UNITED STATES PATENT o'EEIoEf HAROLD w; BUCK,-OF NEW YORK, AN 1) EDWARD ASSIGNORS TO GENERAL ELEcTRIo To all'whom it may concern:

Be it known that We,-HAROLD W Buck and EDWARD M. 'HEWLETT, citizens of the United States, residing, York, county of New York, State of New York, and at Schenectady, county of Schenectady, State of New York, have invented I rovemcnts in Suspension of HighrTension ines, of which the following is a specification.

The present invention relates to overhead suspension of electric conductors and more especially to conductors of'power circuits of high potentials from 60,000 to 100,000 volts.

Heretofore it has been the standard practice to provide the poles -or cross arms with ins upon which were placed vertical insu- EttOIS to which the conductors were directly and rigidly attached. These insulators,-in order to adapt them for use with high potential circuits, were made up by superposinga plurality of petticoats one a ove the other, petticoats varying with the voltages of the currents, and'accordingly the insulators for use with high potential circuits were necessarily of large dimensions,

the dimensions varying with the cube of the potential above 60,000 volts. Besides being expensive, these old forms of insulators were ob ectionable on account of the leverage strains which-any side motion of the conductor imposed thereon. Moreover, when exposed to heavy rain, the flow of water from one petticoat to the nextprovided a low resistance path for the current between the conductor andtower. Where the conductor wire is rigidly attached to the insulator, as has been the ractice heretofore, it soon becomes crystallized-near the point of attach- Inent due to the swaying of the conductor s an under the influence of the wind. Furtliermore'it has been the practice to support a conductor in short spans in order to reheve the insulators of the excessive leverage strains, and as a consequence a large number of expensive poles or towers have been necessary.

The object of this invention is to provide a system of suspension whereby a high potential conductor may be efiectu ally and reliably su ported and insulated at a reasonable cost.

11 carrying out our invention, we do away with the usual insulators and theirv pins and vertical series of insulators provide at certain of the supporting towers a.

bly eoimected COMPANY, A CORPORATION Specification of Letters Patent. Application filed 0ctober,31, 1907. Serial No. 400,125.

respectively, at New pended conductors.

-dle thereof, each M. HEWLETT, OF SOHENECTADY, NEW YORK,

OF NEW YORK.

SUSPENSHION or men-Tension LINES.

Patented June 22, 1909,

to each other and attacherhby a hooked joint at the upper end to theunder side of a cross arm of the tower and at the lower end by an ear or other suitable connection to the sus- At certain other-"towels the conductor, is dead" ended through a horizontal series of flexibly connected insulators on'each'side of the cross arm and a jumper connection joins the dead'ends of the con-' ductor and hangs frcelyby gravity below the cross arm. The dead ending of the conductor will occur at anglesin the conductor iii-order to takethe side stress due to change in direction thereof, and is preferably used at least at every fourth or fifth tower on tan ents or straight sections in order topreventdongitudinal waves of the conductor. due to wind.

The dead ended arrangement may be employed at all points of suspension where preferred, but the construction illustrated herein has advantages.

For a more complete understanding of our lowing detailed description and the accorn panying drawing forming a part of this specification, in which- Figure 1 is a perspective view showing invention, reference may be had to the folthree conducting wires and theupper portion of two supporting towers, the conductors beingdead ended at the left-hand tower and carried by vertical series of insulators at the scale a vertical series of insulators; and Fig. 3 is a similar view of a'horizontal series of insulators.

The towers are preferably made of iron on account of their greater strength and facility of transportation. As shown in the drawing, they'carry .at their tops or near their to s horizontalpross arms 1 secured by s'uitabiia means 2 to the main struts 3, and'toeach of the cross arms 1 are right-hand tower; Fig. 2 shows on a larger permanence,

connected iron rings 4 near the ends and midring being provided with one or more eyes 5 according as they are designed to receive vertical insulator connections as'shown at the right-hand tower, Fig. 1, or dead end insulator connections as shown at the left-hand tower.

The conductor wires 6 are shown at the ri ht-hand tower, Fig. 1', provided with ears 7 aving eyes 8 at their up er edges through which flexible bands or cab es 9 are threaded; At the upper ends of the band 9 is a link insulator 10 through which the band is thread- This vertical arrangement permits. a great ed, and above the'insulator 10 is a second hand or cable 11 connecting'the first link insulator 10 with the second link insular tor 12, and at the upper side of link insulator 12is another band or cable 13 threaded therethrough and having at its upper portion, a hook 14 adapted to engage an eye carried by the cross arm 1. sulators and 12 are shown, it is to be understood that any desired number may be connected in seriesto provide for any voltage.

freedom of movement of the conductors with I the left-hand tower of Fig. '1, the conductor the conductor wire at its point of suspension, and crystallization of its metal is thereby entirely prevented. Moreover,- by reason of theiron towers projecting above the level of the wires, any lightning disturbances will be transmitted to ground through the towers and will not be taken by the conductor wires.

In the dead ended arrangement shown'at one of the eyes 5 carried by the-cross arm of the tower. This arrangement is duplicated on theopposite side of theoross arm to dead I end the op osite span, and 'ajuinper connection 21, w ichmay be either a continuation of the conductor wire 6 01 an independent wire", extends from the clamp 15 on one side of the cross arm to the corresponding clamp on the other side andhangs freely by ravitybeneath the cross arm." This dead on ing arrangement is such that a longitudinal movemerit of a wire under the wave action produced by thewind isieiiectually resisted.

Also any horizontal stress due to the angu larity in the course of the wire is, rovided for.

Each-of the vertical link insu-ators 10 ahd '12,. as ShOwn'indetaiI iii'Fig. 2, consists of a diskportion 22 having ,its center enlarged and prov ided-., with interlinking portions 23 and 24; with a solid wall of insu'lition between them, so that when the fiexiple bandsor cables 9, 11 and 13 are threaded there through, the current cannot pass from one to theoth erwithout actual uncturing of the insulating material. The ower surface of the insulator has an outwardly flaring flange 25 which acts to increase the creepage sur-' face and. maintains the main portion of the lower disk surface dry. The flexible bands .0! cables have their free ends joined b suitable clamps 26. linli insulators, as shown in Fig. 3-,,have a disk,

The horizontal.

portion 22 with an enlarged central portion While only two link in through which they extend from opposite directions to curved apertures 23 and 24 which interlink and have a solid wall of insulation between them, and at the periphery of the disk are two oppositely flaring flanges 26 whereby the peripheral trough is formed by their outer surfaces. This arrangement is' such that from whichever direction the rain strikes the insulator, it will be deflected from the sheltered side so that thelatter will 7 5 remain dry and the liability of the current to pass thereover will effectually be prevented. It will therefore be seen that by reason of the interlocking of the several insulators 1 into a series or chain any potential can be carried thereby in safety. 7 If by reason of. structural or electrical weakness of any in 'sulating unit, one or more insulator walls should break down, the efiiciency of trans mission remains unimpaired since the interlinked metal loops hold the line almost as taut as before. If a suspension insulator should be punctured through electrical weakness or y reason of'mechanical blows or damage, 'the other ins'ultors of the chain will remain intact or if b an extraordinary by Letters Patent of the United States, -is,'-

1. In a system of high tension line sus en sion, thecombination of periodically cad ended spans joined by 'umper' connections, and intervening spans reely suspended beneath cross arms of the supporting towers.

2. In a system of suspension forhigh tension power circuits, the combination of con ductor spans dead ended at the cross arm through two chainsof insulators flexibly connected to each other and to the cross arm, and a 'umper connection'between the adjacent on s of the s ans and hanging freely by gravity beneath t e cross arm.

3. In a system of high tension line sus ension, the combination of eriodic spans dhad ended on opposite sides o a cross arm or support through series of insulators flexibly connected and electrically connected bydepend mg umper wires, and intervening s ans freely suspended beneath cross arms .0 the Z dry some part of its surface in the path .of'

possible electric discharge irrespective ofthe direction of the beating'rain, and means for flexibly connecting said series ofinsulators to the cross arm and to the line wire.

6."In a system of high tension line suspension, the combination of towers provided with cross arms, of conductor spans freely sus ended beneath said cross arms by series of exibly connected disk insulators.

7. A high potential power transmission llne having at intervals between its terminals a chainof insulators, each unit of which is mechanically interlinked with the adjacent one and the terminal units secured to the line, metallic jumper connections around I each chem 'to'complete the metallic contiunity of the line-,and a chain of similarly interlinked insulators at the points of support for the purpose described. 8. A high otential power transmission line having at intervals between its terminals a chain of insulators, each unit of which is mechanically interlinked with the adjacent one, and a chain of similarly interlinked insulators at the several points of support,

each insulator unit being provided w1th a rain shed to preserve dry some art of its surface in the path of ossi ble'e ctric discharge, irrespective of t c direction of beatin I'BJIL n Witness whereof, BUCK has hereunto set his hand this 26 day of October, 1907, andHEWLETT has hereunto set his hand this 29th day of October, 1907.

' HAROLD W. BUCK. EDWARD" M. HEWLETT. Witnesses toBuck: v

. i O. A. HAVILL, A. BAR'rson, Witnesses to Hewlett:

BENJAMIIQIY B. HULL, HELEN Onronn.

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