US1242616A - Sectional high-potential insulator. - Google Patents

Description

S. S. SUNNEBORN. SECTIONAL HIGH POTENTIAL INSULAOR.

MPucmou mtu oms. 191s.

Patnted' Oct. 9, 1917.

Matton/:m3 i

00 if l N /f//VV UNITED sTATEs PATENU." oEEIoE.

SOL S; SONNEBORN, F BROOKLYN, NEW YORK.`

SECTION'AL HIGH-POTENTIAL INSULATOR.

To all whom it may concem:

Beit known 'that I, SOL S. SONNEBORN, a

citizen of the United States, and a resident of Brooklyn, county of Kings, and State of New Yorlnhave invented certain new and useful Improvements in VSectional Hi h-Potential Insulators, set forthY in the 4 ollowin specification. y

his invention relates to high-potential insulators" of the condenser type', employed as bushin for insulatingtransfomer leads and the li e from what is usually a grounded, perforated barrier of conducting material "through which the conducting lead must emerge and from which vit must be insulated.

The object of the invention is to form an insulator 'of' as simple, compact and economical construction as possible, land which rovides protectivefe'atures against hi hgre'quency, high-potential oscillations, ue to abnormal lllne surges as well as embodying :in eilicient design for the normal voltages whichY itv is expected to sustain.

" 'Ifo these ends an' important feature of the invention is to providefor relief without danger of puncture from abnormal stress produced `by high-frequency oscillations, while at the same time employing features such as dielectric configuration -lconforming to the flow lines'. of die ectric stress between Y terminals,`to the end that 'thefiill dielectric value of the air may be employed.' The more particularobject of the present invention is to attain the above advantages in an insulator the insulating material of which isa suitable vitried product such as porcelain. :A still further obect of the 'present invention is to obtain t e aforementioned broad objects in a sectionalinsulator ,to 'the end that, in 4the unlikely eventof a uncture betweenA anyof the condenser .sectlons, the entire insulator may be restored to perfect condition merely by replacing the punctured section.`

Theabove and more detailed objects of the invention 'will more :fully be understood by reference toltheembodiment of the inventiondescribed for illustrative purposes in the following specification and shown in the accompanyingldrawnigs, which form a part hereof, in w. ich like characters designate corresponding parts in the figures and Specicatimiy of Letters Patent.

i --Atpplicatien filed December 9, 1916. Serial o. 135323. 4

in which Figure 1 is aseotional elevation and Fig. 2 isa fra mentary sectional elevation showing a mo ification.l

` In the illustrative embodiment of my invention I have shownfan insulating highpotential `bushing of the condenser type, built u'p out of three majorV coaxial cylindrical sections 1, 2 and 3,4 each injthe embodiment of a comparativel simple vitried porcelain structure'. ternating with these insulatin sections, forming partitions, are two cy indrical sheet metal sheaths 4 and 5. Each section of insulating material 0in to make up the complete insulator A soul firstl be completed and individuell tested, then the assembling of the entire insulator may be effected.

The outer insulating section 1 may have a protecting bushing 6 of sheet metal spun about itJ the bushin being completed except for the mturningofgthelip 7 about the ledge 8. Next the sheath 4 is inserted from the top downward into Vthe section 1 and is initially formed with an outwardly flaring skirt atits. upper end. When inserted within the porcelain section 1, its lower end is spun outwardly to 4 form the bottom outflarin skirt 10. The outward spinning of the skirt I() may be facilitated by the slitting of the bottom end of the sheath 4 or by cutting out triangular sections. Next the composlte structure, comprising the bushing 6, the section 1 and the sheath 4 is slipped from the bottom upwardly over the intermediate section 2, which is formed with an out-flaring petticoat 11, counter-cut on its under side to receive the skirt 9. A cylindrical bushing113 is then slipped over the protruding en 14 of the intermediate section 2. The'inner sheath 5 is then slipped into the intermediate section 2 from the upper end, and its bottom end is then spun outwardly toV -form the out-flaring skirt 15 in a manner similar to the forming of the skirt 10. The sheath 5 then, with its out-Haring skirt 15, locks the parts so far assembled together. The inner sheath then, with its attached parts, is slipped upwardly from the bottom end over `.the central section 3, which is formed at the top with one or more petticoats 16 and 17, the lower petticoat being countersunk to accommodate the out-flaring outer skirt 18 of the sheath 5. The upper p ortion of the central section may be provided with a knob 19 to receive the metal cap 20` and is centrally cored to receive the conducting bolt 21. A porcelain bushing 25 is then slipped over the bottom end of the central section 3 and it may be locked in place by a metal washer 26 and suitable nuts 27, applicable to the threaded ends 28 and 29 of the bolt 2l, and serving thc combined purposes of maintaining the complete structure assembled, relieving electrofstatic stress and providing ready means for electric coiinections. Although I have described the formation of the skirts such as 9, 10, 15 and 1S by spinning out a flange from the integral metal of the sheath, it is to beunderstood that this is merely a preferred method and that the invention covers broadly sheaths having skirts formed in any convenient manner and by no means of necessity in the form o an outwardly spun flange forming an integral part with the remainder of the sheath.

. As a modification of the bushing 25, which is centrally, cylin'drically perforated, a cup- Vshaped bushing 26 may be substituted by slightly shortening the central section 3, as shown in the modication 30.

W'henvin use, this structure is adapted to combine air and porcelain as its insulation above the ledge 8 and porcelain and oil below the ledge 8, inasmuch as in general use the portion of the insulator belovi7 the ledge 8 projects usually within the oil filled metal housing of some structure such as a transformer, so that the oil level is above the outstanding skirts such as 10 and 15. By this provision an arc-over from one of the skirts such as 10 or 15 to the bushing 6 is therefore snuffed and the oil self-healing immediately upon its cessation. The breakdown distance from the ledges 15 and 10 under the conditions of service is intended to be less than that from any of the outer parts of the insulator.

It is of course to be understood that the composite insulator is not limited to the exact number of parts or to the exact configuration of parts illustrated. The arrangement of the metal cap, washer, sheaths and bushing, and the configuration of porcelain barriers is such as to relieve all local tensions directly betn'een the porcelain partitions, so that the combined insulating effect of the porcelain is rendered approximately proportional to its total thickness. The exposed surfaces of the petticoats are intended .to be a compromise between protection affainst surface leakage and positioning along the flow lines of static stress.

What I claim and what I desire to secure by United States Letters Patent is:

1. A high-potential, insulating bushing of the condenser type comprising a plurality of separable nesting cylindrical sections of insulating material; and one or more cylindrical metal sheaths alternating with said sections, one saidssheazthihaving artoutwardly flaring skirt at each end.

2. A high-potential insulated lead-in bushing OI, suchwdmuces as transformers (-,oniprising a plurality of separable coaxial nested setions -of 4insulating material; a metallic sheath located between tWo of said nestedV sections to give a condenserfft; and a conductor extending axially through said sections and having at each end a radially extensive conducting member substantally in the form of a solid of nevolutiion, both of which serve asl` electrostatic stress distributers and at least one of which maintains the assemblage fof said separable sections.

3. A high-potential insulator sampiislg a plurality of separable coaxial.nestedl sec? tiens; and a metaili-sbsathflacated; between efih pair 0i .adiaeeat sectiaas, beth. cada. ef Sudt sheath having: an4 (inwardly SlI 4- A high-potential. iisiiiatcnaamiirisivg a plurality o.. sepamhlecoaxial neftd .Secr tiens; a .metallic sheathloabed between .cash pair of adjacent sections, both ends Qfgaid sheath having an outwardly-.Haring .skirt und end. Sections 0f insulating materiel af enlarged .diameter insulating Sai il-i1arsd ends `in an axially outward diiiection. i

5- A highfpatiital insulating bushin 0.f the condenser type comprising ,a [inra ity of separable cylindrical 'sectimsfbfllinsnl tma material; a metallic @andenes- Shelli between tw@ adjacent :Semanas the` aat'e section having a circumjerentialsupporting ledge; anda Sheet-.metal Sheath'loc fellas a combined mechanial-ptatat0ran evitra; Stati@ .Stress ydist.iihutai abaiitsai. `eviter non including saidgsu'ppcitingla ge` G. A. higli-noteatialinsulableg buSh, ai the condenser ty e comprising@ .Plaruy of ,nested indiyi' ual cylindricalsectioiis of insulatingY material; a. metalliaalieath-.laf cated between each .two adj sent sections; at Vleast one ntsaid metallica eaths, avia a ponan at one end. outwardly tiara an.. forming bath a Hang@ mehaniaally`teding to hold a, nluralty af ,salidlsectnsip as# semblement .and an .eleatrlc relief4 marcher.-

7 A high-.potential 119.5ulink-iria hashing Comprising. a. maior section of 'cylm contour having at its top one .or 'morgenpwardly flaring petticoats :and a dependent tubular sleeve; a metallic sheath "incsin Said .tubular sleeve; a Second. Cylin. wel portion of insulating material nes'tedabavt said metallicsheath; and means fonhold.- ing said partsV in assembled relatim.V

8. A highpotential insulating. bushing comprising one section having encor vmgm outwardly Haring peLtiOats and' Q neor.- tubular portions;V one. ,or more gee:

tions of insulating material, each nested said petticoats; and means for holding the about the tubular portion of another secparts in assembled relation comprising an tion; and a metallic condenser sheath loaxial conductor. 10 cated between one o1' more pairs of ad- In Witness whereof I have signed my jacent sections of insulating material and name to this specification, this 8th day of having an outwardly Haring skirt conform- December, 1916.

ing in configuration to one face of one of SOL S. SONNEBORN.

Copies of this patent may be obtained for ve cents each, by addressing the "Commissioner of Patents,

Washington, 11.0.

Images