US1755068A - High-voltage structure - Google Patents

Description

April T5, ism.,

HQ s. Mmmm@ ET AL HIGH VOLTAGE STRUCTURE Filed sept. 25, 1927 Lig!!i 4 SheetswSheei; 1

INVENTORS.

H. G. McDONALD ET' M- HIGH VOLTAGE STRUCTURE Filed sept. 23, 1927 wim Unna ld,

INVENToRs. Hah/ard /Vac TTRNEY 2 4. Y. mf n MN F April l15, 1930. H, G, MaCDONALD ET AL 1,755,068

' HIGH VOLTAGE STRUCTURE y Filed Sept. 23, 1927 4 Sheets-Sheet 5 BY Mg TTORN Y lApril 15, 1930. H', G MaCDONALD E T AL 1,755,068

HIGH VOLTAGE STRUCTURE' Filed Sept. 23, 1927 4 Sheets-Sheet 4 INV-ENTORS.

ATTORNEY Patented Apr. 15, 1930 '-UNI TED- As'l'A'rEsl PATENT ortica HOWARD o'. MACDONALD, or MURRYsvILLR, "AND .Tassa n MATni-in AND GORDON A.

BURR, or wILxINsRURG, PENNSYLVANIA, AssIeNORs To .-wEsrINGnoUsn nLnc- TRIc AND MANUPAOTURING COMPANY, A` CORPORATION or PENNSYLVANIA HIGH-VOLTAGE STRUCTURE Application alga september 23, 1927, serial No.221,439.

VOur invention relates to high-voltage strucv tures and `particularly to terminal or bushing 4 structures for .oil-lled circuit interrupters. @ne object of our invention is to provide a 5 structure ofthe above-indicated character in which a bodyV of oil adjacent to a terminal of l an interrupter shall be maintained free of injurious elements, such as carbon and metallie particles which are `given oi by the conditions.

interrupter' contact membersundercertain Another objec't'of our invention is to pro-v vide a `Well or shield structure, for local disposition about a high-voltage bushing, that shall be effectively sealed and that shall embody electrostatic shielding'or distributing means. 4

Another object of our invention is to provide a novel extension element for a portion 2Q of a high-voltage bushing'of standard form,

whereby a container for an insulating fluid `Amay be mounted about a portion of the bushing. l

' Another object of our invention is to rovide end members for a highvoltage uid receptacle, that shall embody the combinedV functions of closing the ends of the receptacle, protecting'- the same against electro- 4 static stresses and lacing the same in accu- 30 rately adjusted position.

Another object ofour invention is to' pro-- videv means for adjusting a well structure relative to a bushing that shall also beadapt- C ed'Or the reception of a illingelement or the well'ata selected'V position relative tothe bushing; v

Another objectof our invention is to pro- Y ,vide ahigh-voltage structure 'that shall embody a condenser bushing, of a certain'type 40 having a portion of its length divided'into uniform volta'gegradient steps, and an invsulating iiuid containerv for protecting said portion. j f

Another object of our invention is to',y provide a novel arrangement of 'askets', between a bushing and a Huid 'vesse therefor, that shall effectively seal the vessel and facilitate the turning of an adjusting element therefor.'

Another object of our` invention is to pro,-v vide :thigh-'voltage we 11 structure that shall 'destructionof the interrupter.

be adapted for mounting on a bushing especontact members, whenthe interrupters op- In high-'voltage circuit-interrupters of the ings, lower the surface resistance of the bush- .f

ings and may thereby, cause break-down of.

the bushing and other damage,if not the total It is our aim to overcomethe above-mentioned objection and to provide a bushing structure that shall, vin eneral, be better adapted to withstand big voltages and be' y tofore employed. Accordingly, in practicing our invention, we provide a bushing, preferably of the con-v an improvement over bushing structures heredenser type, and meansl inthe form of a 'Well-structure,` for so maintaining a body 'of oil, immediately adjacent thereto, free of contaminating inuences, such as the`above mentioned conducting partlcles as to 1n- "creasethe length 'of life of the bushing and ensure moreetfective'operation.

Means are also provided forsealing, ad-

justing, mounting,'shielding and filling the Wellgstrueture and for adapting itft'o be mounted relative to EL-special, or to a standard, v

bushing.

.Flgure 1l of'theA accompanying drawings is a side view, partially in elevation and partial- 1y in section, of a portion lof a high-.voltage circ'uitfinterrupter structure -embodying our invention,

' Fig. 2 isan enlarged fragmentary top plan viewof a Wellstructure included inthe invention, parts being omitted,

Fig. 3,'sa longitudinal side sectionalv ievv v j of thestructure-'shown in Eig. 2, with a por The element 2 is also', provided with a con-v ducting inner portion'in the form offa brass,' :or .othery metal, -tubef12'which may project slightly from" the inner end of theelementtion of a condenser bushing shown inelea portion ofFig. 1, of modified forms of our` Referring to Eigs. 1, 2,3 and 4', the device comprises, as an oil-iilled circuit-interrupter tank 1, a

condenser-bushing-element 2 that is supported vin a wall or -cover 3'of the tank 1, as by a structure: 4, a wellstructure', and stationary and movable Contact elements 6 and 7, re-

' spectively.

, 1 l Theeondenser-bushinf.element 2 is of us- 1 lual construction, r

alternate layers of metal foil and v.which the layersagre stepped: or. cut on provide uniform-voltage gradient.betweenl Y member 16,'. asfmoreclearly shown in Figs.

embodsying' tightly-wound paper impregnated with av hardened binder, having an intermediate portion 9of uniform cylindrical form and-a tapered end portion '10,on to the inner and outer surfacesof the element.

.and be provided with; a 'screw-threaded' portion 14; y ..2

tThe ,supporting structure 4 comprises a ltubular member 16 secnred tothe portion 9,

a lateral flange poras by abody 'of cement,

flange or rib 19 anda lowerend portion 2() for cooperation witli thefwell structure 5, in a mannerA vto bei-hereinafter pointed out. y f

I cure and transverse end ing member 4, a laterally-extending annular,

The -langeslS and 19 are for mounting and.l

positioning the condenser-bushing element'2 in an -openlng 1n a 11d or cover 22 thatconvstatutes part of a current-transformer casing 23. The latter is disposed partiallyinside and Lpartially outside'the cover3l and` is'sethereto, an by bolts 26 and a sleeve 27 thatv is welded'to the cover 3.' i

'erably constructedfof relatively massive and vthick-walled porcelain'having side walls tendingto' converge downwardly, exterior surface-creepage flanges 29 on theside walls,

and parallel.

` .An upper terminal member or hood 3, forthe vmember 28, comprises a tubular portion 32 disposed about the intermediate portion' 9 of the condenser bushing 2 in, or telescopically related to, the e'nd portion 2O of the support- ,.fiange portion v33l an-d an outwardly-.anddownwardly sloping, annular electrostaticssl' stress-distributing portion 34 having a rounded perimeter 35. An' annular shoulder 36 opposite an opening thereinvfor introducing in genral', .a fluid receptacle, such surfaces tha-t' are' preferably machined to render themperfectly-i'latpositiona gasket 37 therebetween. A pipe 39, having aeap 40, is mounted on the member 30 oil into the well structure'. v

A lower terminal member 42 comprises an interiorly screw-threaded portion 43 forA v mounting the same-on the portion 14, a disvcoidal portion 44 for fitting against the lower end of'theporcelain body 2S and having an'V opening for the re'ceptionof a plug 45 therein,

"and an outer electrostatic-stress-distributing portion 46 of inverted substantially cupshape. A washer or gasket 47 'may be placed i between the members 28 and 42.

As shown more clearly inv Fig. 4, a washer 4H, above'the portion 44, has a' plurality of i angularly-spaced openings v49, in its' upper portion. that communicate with an V`annular groove 50, in its. lower portion, over the open. ingin whichthe plug 45 is disposed.

Referring again to -the upper terminal member 30'of the vWell `5 and to the tubular and 3,.th`e lower end 2O of the member 16 is grooved for the reception of a packing ring A52V and provided with' openings for `the recep- -to be herein set forth. 'Tapped openings 58, inthe ring 54, are provided for the receptionA of bolts 6( ),.extending parallel tothe bushing, that engagerece'ssed' portions 62, in the-inember "30, and are heldin position, as by'lock nuts G3.

In, assembling the parts, with the bolts sufficiently-[witlidrawn from. they `position shown, the member 30 is'placed over the lower end ofthebushing'to a position'adjacent to the position shown andfturned until the pins 57 are disposed over the hooks 55 for temporary positioning thereby.l The gasket 37, the' insulating well body 28,-the gaske't'47 and" other parts are then p'lacedin position around i the bushi g in the order named.

After t estationary contact element 6 has I rreceived its final adjustment for proper cooperation with v the movable'contact member 7.

the lower terminal structure 42 isadjusted and locked in position'on the portionA 14, as by screwing-the portion`43 downwardly against the elementj. f

After this operation, the :member 30 is turned to displace the pins57 from the hooks 55, as shown more clearly in Fig.y 2, and the well is" then permanently sealed and-secured in operative position by turning the bolts' 6 0 y against the upper terminal member 30l of the l "well, structure 5 and locking the bolts by meansl-of the nuts 63. .l

ln operation, with the well 5 immersed in the'main` body of oil in the interrupter casdesignated by ing, carbon and metallic particles cannot affeet thel oil in the well, and the-graded end portion 10 of the condenser-bushing element 2 is thereby protected.

. The terminal portions 35 and` 46 so.dis' tribute the electrostatic field and prevents its concentration as to materially improve the operation ofthe bushing and to el'isure'that ultimate Hash-over will occur between the4 metal end members free of the insulating ma.- terial@ j In the modifications of our invention shown in Figs. 5, 6, 7 and8, correspondingparts are acters.

` In the form of our inventionshown in Fi 5, the upper terminal or hood 30 oi' the we l. structure 5" is screw-threadably mounted in the lower' end-portion 20 of the tubular sup# 20' porting member 16- for turning about .the

bushing2 to. press it against the upper end of the insulating well'portion 28.

In view of this turning movement, instead `of the gasket 37 of the device of the previous figures, a'pair of gaskets 65 and 66 are provided between the Amembers 28 and 30. The upper gasket 65, or the one next to the metal hood 30, is preferably of treated paper, such as vellumoid or similar material that is relaon an extensionmember`70. The latter is tively hard,smooth and iiexible-a'nd the lower gasket 66, or the gasket next .to .the/porcelain body 28", is preferably of cork. This construction facilitates turning theliood'i()rela` tive to the body 28 and provides an effective seal'between the members'28 and 30.'

Also, instead ofa single opening in the member 30, fortherec'eption of the `filling 'pipe 39, a plurality of radial openings 67' therein provide passageway/s Vbetween ythe exterior and interior of '.the well and are tapped adj acet .tothe'outer ends Athereof.v-

This construction permits one or more pipe- `threaded rodsto -be placed in the openings 67 for turning the hood 30 and, also, permits a sef lection of one of the openings 67 for the recepv tion `oi? the lling'pipe 39.. After this lselection, each ofthe other closed by a plug68;

openings 67 maybe The device. shown in Fig. 6 is similar to that of -F ig. 5, except' that the hood. 30,. instead of bein'g attached directly to the portionfQO Voi the tubular supporting member 16, is mounted adapted for attachment tothe portion 20 by @means of screws 'Yland is provided with a lower internally screw-'threaded portion 72, similar to the portion 20 of Fig. 5, for the reception of the portion 32 of the hood BO .In the deviceof Fig. 7, thewell structure 5 is not secured to the supporting member 1.6 but is mounted on'thei'portion 9'of the 'con- 'denser bushing element? by a split-ring member 74 which is clamped in position byabolt vor bolts 75'. ff

Screws 76 cooperatefbetween lugs 77 on the corresponding reference charg" ring 74 and bosses" 79 on the hood -8 for lon! l gitudinally adjusting and holding the latter.

Also, in this form of our invention,v the pipe 3,9 has a diagonal'section 80.which is screwed into the entrance to a diagonal hold through the hood 3.0. j

In Fig. 8, the well structure isalso supported directly o n the portion 9 of the condenserbushingelement 2 by a clamp-ring member 82` that is-"secured in position by4 abolt 88. 'A

tubular portion 84similar to the jportion 20 of the other gures, depends from the ring 82 and-is `internallyscre'vv threaded forthe reception o'fthe portion 32 of the hood 30.

The portionf84 is alsoA adapted to receive a packing ring 85 for compression between the n same and the portion 32. Y

While we have shown and ticular forms of our invention, changes may be effected therein without" departing from the spirit and scope thereof, as. set forth in the appended claims.- l. j

'We claim as our invention :v

1. lIn a high-voltage'structure, the combi.y

Vnation with a main receptacle for a `fluid, an

described par- I closing said opening but movable to ,permitf drainage of the well. y

2. In a'high-voltage structure, the combination with' a main receptacle fora iiuid, an

electrical device therein and acondenser ter` los minal bushing for'said device extending through a wall of the'receptaclevvith' an inner portionbelow the level oi said fluid, of means for surrounding only said' inner bushing portion by another fluid body and maintaining said fluid bodies separate comprising an insulatin well member supported directly on the bus ing.`

3. In a high-voltage structure, the combinalio tion with a main receptacle for a uid, an elec'- tricaldevice therein and a condenser terminal bushing for said device extending through 'a wall ofthe. receptaclewith aninner portion below the level of said fluid,`of means forsurrounding -said inner bushing portion by y'another fluid body and maintaining said'flu'id bodies separate comprising an insulating well member, a longitudinally adjustable upper,

end member for the well member'and means' holding said end member in'.- )position relative to said bushing.l

-4.-In a high-voltage structure, the combii nation with a'main receptaclefor a duid, an

for temporarily electrical device therein and a condenser terminal bushing for said device extending through a wall of the receptacle with an inner sition removed from said wall.

portion below the level'of said fluid, of means for surrounding said inner bushing portion by another fluid body and maintaining said well member mounted on' the bushing at a po- 5.In a high-voltage structure, the-com -A bination with main receptacle for a Huid,

' an electrical device thereinand a condenser terminal bushing for said device extending means forsurrounding said'inner bushing portion'by another fluid body and maintaining 'Sai'd 4fluid bodies separate comprising f term-inal. btnihin'g for said device extendingy 25'throngliza.,ly' ra l 1o f therecept'acle with 'an inan insula tingf wellineniber mounted on the 'bushing' and having'itsupper vend sealed to the bushing in' said receptacle.

`6.- 'In a high-.voltage structure,

an electrical device therein and a condenserV ner'portonbelow the level-of said fluid; of

i .-'ne'r portion below the level of said-fluid, of"

i`i1eansfor jin'ir'xoun.dingv said inner bushing portionby'aiither fluid body and maintaining sind fiui'd bodies separate. comprising'an' lyjnsulating well` member and downwardly ex- -j tending electrostatic-field-con'trol means adjacent-.to the lower end of said well member..

miiialbushing 'for said'devi'ce,r extending through a wfall of the 'receptacle with anv inmeans forsurrounding said inner bushing l@O riortion by another f luidjbody andmaiiitaim -ing said fluid bodies separate comprisingan -'ivfinsulating well member, an .idjnstable vcap member-for the Well member and means 'for I Securing the cap member'in adjusted posit'ic'fi'.

' l'nation with.` a main receptacle'for afiiuid, anA

8. In a high-voltage '-structiire, the combi- 4 electrical-devicetherein and a c'oiidensertermmal .bush1ng for said device. extending I i' ltudinally-slidable' teslescopic relation to said.

through a w'all of the receptacle with an inmeans for .surroundingsai'd innerbushing relation t`o` thebushing, an insulating'niell .having `a tubular portion' disposed in longitubular lsupporting element.

j 9. In a high-voltage struc nation with `a main receptacle for a fluid, an electrical device therein .and a'condeserterminal bushing for said device extending through awall of the 'receptacle with an in-f `ner portion below thelevel of said fiuid,` of

fluid bodies separate comprising an insulating A' 7. In a high-voltage structure,` the combi-` ."n'ation with 'a main receptacle for a fluid, an. 'f eleotrcal'device therein and a condenser ter! ner yportion below the level of said fluid, of-

ture, the combi'- avancee means for surrounding said inner bushing portion by another fluif body and maintaining said fiuid bodies .cparate comprising a stationary tubular element surrounding the bushing', an insulating well structure having a ltubular portion telescopicallyrelated to said tubular element and means for locking said tubular portion to said tubular element,

10. In a vhigh-voltagev s'tructure,' the cornbinationiwith a main receptaclel for afluid',

an electrical Vdevice therein .and a condenser termina-l bushing for said device extending "through a wall'ofthereceptacle with van inner' portion below the level of said fluid, of means for surrounding said inner bushingl portion byanother fluid bodyv and maintain? ing said vfluid bodies separate comprising a well structure includ-ing a tubular, insulating body having an end adjacent to oneend of the bushing, and annular upper' and lower the combination with' a main receptacle fora fluid,

electrostatic-stress-distributing members constituting closure means for the endsof-said` tubular body 'havinginlet and outlet prts therefor, respectively.

11. Iii a high-voltage structureythe combination with a main receptacle for a fluid, an

electrical device therein anda condenser ter- '.ininal bushing for said device extending through a wall 4of the receptacle with an in;V i

ner portion below the level of said Huid, o f

. nieans for surrounding said inner bushing portion by another fluid body and maintain.- ing said bodies".separate comprising anin-w 'sulating receptacle surrounding said inner portionhaving larelatively large number of outer-surface@ annular surface- Creepage flanges and an annular -electrostaticfstress-- distributing member of inverted substantialnation with a main 'receptacle for a Huid, an l l I electrical devlce-therein and a condenser terminal `bushing "for 'said device extending* througha wall of 'the' receptacle with an in ner portion below the level of saidfuid, of

meansgfor surrounding said inner bushing portion by 'another fluid body land maintaining saidv bodies separate comprising an insu-4 lating'receptaclefsurrounding said inner portionhaving buter-surface 'creepage fian'ges,f'

annular laterally projecting metal end struc-'v tures constituting sealing means between the bushing and said insulatingreceptacle and electrostatic-field-eontrolling nieansftheflower of saidv metal end structures #having an' opening therethrough,and a member normally closing said'opening'but movable to permit drainage ofthe well, 1 i,

13. In. 'a'ci'reiiit-interrupte` structure, the

'prising' va longitudinally adjustable annular 1'25 combinationA with af-(x'mdenserw bushing, of means for surrounding an inner portion theremember adjacent to the inner end of the bushing5 a tubular insulating Well member on said member, a longitudinally adjustable 4annular member at the upper end of said Well 5 member, said inner-end member having an opening therethrough, and a member normally sealing' said opening but movable to vpermit drainage of the Well.

14. In a circuit-interrupter structure, the combination with a condenser bushing, of a well structure for surrounding an inner portion of the bushing by a body of oil separate from a body of oil in which the interrupter is immersed comprising an electrostatic-fieldcontrolling member of inverted substantially cup-shapeat the bottom of the Well. I

15. In a high-voltage structure, the com-- bination with a main receptacle fora fluid, an electrical device therein and a condenser ter. minal bushing for said device extending througha Wall of the receptacle with an inner portion below the level of said iuid and an upper portion above the Wall, of means for surrounding only said inner bushing portionv by another iiuid body and maintaining said fluid bodies separate from each other and free from the outer bushing portion comprising f an insulating Well mem er aroundl said inner bushing portion 'and means providing a fluidtight connection between the upper end of said Well member and an intermediate portion of said bushing.

16. Ina `high-voltage structure, the combination with a mainl receptacle for a fluid, anl electrical device therein and a condenser terminal bushing for said device extending through a Wall of the receptacle With an inner portion below the level of said Huid and an upper portion abojve the Wall, of meansfor '40 surrounding only said inner bushing portion by anotherluid body Vand maintainingl said fluid bodies separate and free from the outer bushing portion comprising an insulating Well member around, and removablymounted relative to, said inner bushing portion and means plroviding a fluid-'tight connection between t e upper end of said well member and an intermediate portion of said bushing.

In testimony whereof', We have hereunto subscribed our namesI this 16th day of September, 1927.` 'v HOWARD G. MACDONALD.

' JESSE E. MATEER.

5 f GORDON A. BURR. 5 I l

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