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Publication numberUS3686604 A
Publication typeGrant
Publication dateAug 22, 1972
Filing dateAug 12, 1969
Priority dateAug 12, 1969
Publication numberUS 3686604 A, US 3686604A, US-A-3686604, US3686604 A, US3686604A
InventorsEdwin A Link, Edward L Sankey
Original AssigneeRte Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Current interrupting safe break terminator
US 3686604 A
Abstract
A current interrupting connector for connecting a high voltage shielded cable to underground distribution apparatus, the connector including a housing formed of resilient insulating material and having a connection recess for an electrically conductive element and a cable termination passage sealed at both ends for housing a removable non-expulsive or non-gas forming interrupter. Electrical connectors are provided in the passage for connecting the interrupter to the electrically conductive element and to the high voltage cable. Each of the connectors is molded into electrically conductive sleeves which also surround and electrically shield the interrupter.
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Description  (OCR text may contain errors)

United States Patent Link et al. [4 1 Aug. 2 2, 1972 CURRENT INTERRUPTING s 3,116,386 12/1963 Sperzel ..339/59 X BREAK TERNHNATOR 3,134,874 5/1964 Cameron ..337/ 159 [72] Inventors: Edwin Link waukesha; Edward 2,246,193 6/1941 Smith, Jr. ..337/l9l y, New B n. h of W FOREIGN PATENTS OR APPLICATIONS Assigneol RTE rp Waukosha, i 828,861 2/1960 Great Britain ..337/224 [22] 1969 Primary Examiner-Bemard A. Gilheany PP 8 Assistant Examine rDewitt M. Morgan Attorney-Ronald E. Barry and James E. Nilles s21 u.s..c|. ..337/201, 337/224 51 int. Cl.....H0lh 85/02, H.0lh 85/22-,-HOlr 13/46 [57] ABSTRACT [5M Field of Search ..l74/73; 337/191,:192, 193,- A cu n r p i g connector. o connecting 81 337/197' 201.205, 2 3; 339 45 59 0, high voltage shielded cable to underground distribu- 0 1 1 1 143 tron apparatus, the connector including a housing j I a formed of resilient insulating matenal and having a 5 References Ci connection recess for an electrically conductive eler ment and a cable ternunation passage sealed at both UNITED STATES PATENTS ends for housing a removable non-expulsive or nongas forming interrupter. Electrical connectors are profi 'z vided in the passage for connecting the interrupter to 2660644 11 1953 f 337 224 the electrically conductive element and to the high I urray 3 voltage cable. Each of the connectors is molded into 2593426 4/1952 pahnpe 7/224 electrically conductive sleeves which also surround and electricallyshield the interrupter.

3,307,137 2/1967 7 Claims, 1 Drawing Figure Tordoff et ah. 1 74/73 X CURRENT INTERRUPTING SAFE BREAK TERMINATOR BACKGROUND OF THE INVENTION Underground distribution systems are rapidly replacing the conventional overhead distribution system. Due to the low inductance of underground cables, high fault currents can and do occur in these systems. These fault conductive stranding 38. The cable 12 is prepared for termination by removing the stranding 38 and stripping SUMMARY omwvgmon ,ljl

c The invention described herein provides'a current interrupting connector for interrupting hi'gh fault cur f rents which is adaptable to .anundergrounddisti'ibution I system. This connector incorporates the features of a safe break terminator of the type shown in-application Ser. No. 748,142. The connector includes an insulating housing in the form of a termination elbow used in the off the semiconductive sheath 36 to expose a portion of the cable insulation 34. The cable insulation 34 is cut away to expose a predetermined length of the conductor 32. A terminal lug 40 having an axially extending opening 42 at one end is secured to cable 12 by inserting the exposed conductor 32 into the opening 42 and crimping the lug at 44 to secure the lug to the conductor 32. A threaded aperture 46 is provided at the other end of the lug 40.

ln'accordance with the invention, the current interrupting connector 10 includes a housing 50 in the form of an elbow formed from a resilient insulating material such as clay filled, ethylene propylene terpolymer available under Du Ponts trademark Nordel and has a connection recess 52 and a cable termination passage 54, having a reduced diametersection 55. The connection recess 52 is tapered for mating engagement with the outer surface 24 of the housing 22'of the bushing to form a seal on connection. An electrically conductive element 56 having a threaded portion'57'is positioned in the recess 52 for telescopic engagement with the electrically conductive sleeve 30. An insulating member 58 of arc extinguishing material is provided on the end of the conductive element 56 which cooperates with the insulating member 28 in the connection inlet current magnitude,'various interrupters could be employed such as a sand fuse, oil fuse cutout or a vacuum interrupter. The housing is provided with a termination passage with electrical connectors mounted in a spaced relation in the passage to electrically engage the interrupter. One of the connectors is connected to an electrically conductive element which is adapted to be connected to a bushing forthe terminator. The other connector is connected to the high voltage cable.

Other objects and advantages of the present invention will become apparent from the following description when read in connection with the accompanying drawing, in which an elevational view is shown of the current interrupting connector mounted on the bushing for a transformer.

DESCRIPTION OF THE INVENTION I other specific structure.

The current interrupting connector 10 of this invention is used to interruptfault currents at the electrical connection of a high voltage cable 12 to a bushing 14 provided on a wall of an underground distribution transformer. The bushing 14 forms one part of an electrical connector of the type shown in application Ser. No. 748,142 and includes a housing 22 formed of electrically insulating material having a tapered outer surface 24 and a connection inlet 26. An insulating member 28 of arc extinguishing material is positioned within the connection inlet-26 in coaxial alignment with an electrically conductive sleeve 30 which is connected to electrical apparatus within the transformer.

The high voltage cable 12 includes an electrical conductor 32, either solid or stranded, a cable insulation 34, a semiconductive sheath 36, and an electrically 26 to extinguish the are on disconnection as described in application Ser. No. 748.142.

Means are provided in the passage 54 for supporting the electrically conductive element 56 in the recess 52. Such means includes an electrically conductive ring 60 having on one side a break or split and on the other-side a boss 64 having a threaded aperture 66. The threaded portion 57 of the electrically conductive element 56 is threadedly received in threaded aperture 66.

The ring 60 is supported in the passage 54 by means of a first inner member which is molded in the form a sleeve from a resilient electrically conductive material such as an ethylene propylene terpolymer available under Du Ponts trademark Nordel. The inner member 70 includes a portion 72 which forms the inner end of the connection recess 52 and seals the connection recess 52 from the passage 54. The inner member 70 also surrounds the boss 64 and provides an electrical shield around the ring 60 and along a portion of the inside of the passage 54.

Cable termination is provided in the passage 54 by means of an electrical-connector 74 having a threaded boss 76 which is threadedly received in the threaded aperture 46 in the terminal lug 40. The electrical connector 74 has aflat base 77 and upwardly extending tangs 78 which converge slightly toward the center of the passage 54.

The connector 74 is supported in the passage 54 by means of a second inner member 80 molded in the form of a sleeve from a resilient electrically conductive material. The second inner member 80 includes a first portion 82 having an inside diameter slightly smaller than the diameter of terminal lug 40 to provide a tight fit on insertion of the terminal lug 40 into the elbow. A good electrical contact is thereby provided between the terminal lug 40 and the innermember 80. The remaining or second portion 84 of the inner member 80 ex: tends axially along a portion of the passage 54 terminating short of the inner member 70.

covers the inner surface of the second inner member 80.

Fault currents in the cable 12 are interrupted by means of a non-expulsive or non-gas forming interrupter 85 which is removably positioned in the passage 54.'The interrupter 85 preferably comprises a .sand

vided within the tubular insulating body 86 which is completely filled with sand 92. The interrupter 85 is a 4 means for interrupting current removably positioned in said passage,

first means for electrically connecting said current interrupting means to said electrically conductive member and second means for electricallyconnecting said current interrupting means to a high voltage shielded cable, a first inner member formed of an electrically conductive material disposed within and extending axially along a portion of said passage to electrically shield one of said first means and. said second means and the corresponding portion of said current interrupting means. I '2. The electrical connector'according to claim 1 ineluding a second member formed of an electrically conductive material disposed within and extending 1 along a portion of said passage to electrically shield the conventional type fuse and is capable of interrupting 1 fault currents above 10,000 amperes. Other types of non-expulsive interrupters can also be used depending upon the magnitude of the contemplated fault current such as an oil fuse cutout or a vacuum interrupter. a

The electrical circuit between the ring 60 and the electrical connector 74 is completed by inserting the interrupter 85 into the passage 54 until one of the caps 88 is seated against the base 77 of the connector 74 and the other cap 88 is positioned in the split ring 60. In this regard, the split ring 60 has an internal diameter slightly smaller than the outside diameter of the cap 88 to allow the fuse 85 to be-inserted through the split ring 60 into the passage 54. The inherent resiliency of the I ring 60 will produce an electrical connection between the ring 60 and the caps 88. The tangs 78 on the conductor 74 are bent inward slightly to provide an inherent bias for electrically engaging the cap 88 on the fuse 85.-

The cable termination passage 54 is sealed at the open end by means of a cap 93 having a tapered inner surface 94 which matingly engages the outer surface of the housing. The other end of the passage 54' is sealed by means of the engagement of the section 55 with the cable insulation 34. The internal diameter of the section55 is slightly smaller than the outside diameter of the cable insulation 34.

The outer surface of the housing 50 is electrically shielded by coating the housing with an electrically conductive material 96. An electrically conductive tape 98 is wound around the housing to connect the electrically conductive material 96 to the conductive sheath 36 on the cable 12. The integrity of insulation from the apparatus to the cable will be continuous when the connector 10 is mounted on the bushing 14. 7

Various of the features of the invention are set forth in the following claims:

What is claimed is:

1. An electrical connector for connecting a high volt- 'ment positioned within a bushing for an underground electrical apparatus, said connector comprising,

a housing formed from a resilient dielectric insulating material and having a passagetherein,

an electrically conductive member positioned in said housing and adapted to be connected to the electrically conductive element in the bushing,

other of said first means and said'second means and the corresponding portion of said current interrupting means and means for electrically insulating saidfirst inner member from said second inner member.

3. An electrical connector for connecting a high voltage shieldedcable to an electrically conductive element positioned within a bushing for an underground electrical apparatus, the bushingincluding an arc extinguishing member at the entry end of the conductive element, said connector comprising a housing formed from a resilient dielectric insulating material and having a recess which is adapted to sealingly engage the bushing,

an electrically conductive member positioned in said housing and adapted to be connected to the electrically conductive element in the bushing,

an insulating member of arc extinguishing material on the end of said electrically conductive member,

means for interrupting current removably positioned in said housing,

first means for electrically connecting said current interrupting means to said electrically conductive member,

said second means for electrically connecting said current interrupting means to -the high voltage shielded cable, a t

a first inner member formed of an electrically conductive material disposed between said first means and said housing to electrically shield a first portion of said current interrupting means,

and a second member formed of an electrically conductive material disposed between said second means and said housing to electrically shield a second portion of said current interrupting means.

4. A connector according to claim 1 wherein said current interrupting means comprises a sand filled fuse having an insulating housing, an electrically conductive cap at each end of said housing,

a fuse link within said housing electrically connected to said caps,

and sand completely filling said housing.

5. A current limiting unit according to claim 4 6. A current limiting unit according to claim 4 wherein said second electrically connecting means comprises a base having a number of inwardly disposed tangs to engage one of said caps.

7. An electrical connector for connecting a high voltage cable to a receptacle having an electrically conductive sleeve connected to a high voltage conductor, and an insulating sleeve or arc extinguishing material at the entry end of the electrically conductive sleeve, said connector comprising,

an insulating housing having a connection recess adapted to matingly engage said receptacle and a cable termination passage, said housing being formed from a resilient insulating material,

a pair of electrically conductive connectors supported in a spaced relation in said passage,

an electrically conductive element positioned in said a recess for insertion into the electrically conductive ductive material disposed between one' of said pair of electrically conductive connectors and said insulating housing to electrically shield a portion of said current interrupting means,

and a second inner member formed of an electrically conductive material disposed between the other of said pair of electrically conductive connectors and said insulating housing to electrically shield the other portion of said current'interrupting means.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1730716 *May 25, 1925Oct 8, 1929Ohio Brass CoHigh-potential fuse
US2246193 *Jan 11, 1939Jun 17, 1941Gen ElectricElectric fuse device
US2593426 *Nov 12, 1948Apr 22, 1952Westinghouse Electric CorpHigh-voltage power fuse and the like
US2660644 *Jul 10, 1951Nov 24, 1953Usco Power Equipment CorpHigh-voltage fuse
US3116386 *Nov 15, 1960Dec 31, 1963Whitney Blake CoElectrical cable connector
US3134874 *Jan 30, 1961May 26, 1964Westinghouse Electric CorpCurrent limiting fuse
US3307137 *May 27, 1965Feb 28, 1967Mc Graw Edison CoConductor termination
US3345483 *May 6, 1965Oct 3, 1967Westinghouse Electric CorpRemovable current limiting fuse
US3512118 *Feb 2, 1968May 12, 1970Westinghouse Electric CorpHigh voltage electrical connector
US3513425 *May 21, 1969May 19, 1970Gen ElectricModular electrical conductor termination system
GB828861A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3818407 *Sep 25, 1972Jun 18, 1974Amerace Esna CorpHigh voltage fuse enclosure
US3868615 *Nov 12, 1973Feb 25, 1975Chance Co AbCurrent sensitive interrupting terminator assembly
US3946351 *Feb 28, 1975Mar 23, 1976Mcgraw-Edison CompanyShielded fuse assembly
US6831232Jun 16, 2002Dec 14, 2004Scott HenricksComposite insulator
US7028998Mar 4, 2003Apr 18, 2006Maclean-Fogg CompanyStabilizer bar
US7041913Apr 6, 2004May 9, 2006Barker Jr James WMethod and arrangement for providing a gas-tight housing joint
US7180004Jan 18, 2006Feb 20, 2007Maclean-Fogg CompanyMethod and arrangement for providing a gas-tight joint
EP0110008A2 *Jul 18, 1983Jun 13, 1984Felten & Guilleaume Energietechnik AGConnection device with a fuse for enclosed medium voltage switchgear
EP0769795A2 *Aug 30, 1996Apr 23, 1997Efen Elektrotechnische Fabrik GmbHHigh-voltage high-power fuse for an electrical connection line
EP1286375A2 *Jul 9, 2002Feb 26, 2003EFEN GmbHElectrical T-connector
WO1984000078A1 *Jun 14, 1983Jan 5, 1984Raychem CorpShielded electric components
Classifications
U.S. Classification337/201, 337/224, 174/73.1
International ClassificationH01R13/68, H02G15/064, H01H85/042
Cooperative ClassificationH01H85/042, H01H2085/0225, H02G15/064, H01R13/68
European ClassificationH01R13/68, H02G15/064, H01H85/042
Legal Events
DateCodeEventDescription
Nov 18, 1988ASAssignment
Owner name: COOPER POWER ACQUISITION COMPANY, A CORP. OF DE
Free format text: MERGER;ASSIGNOR:RTE CORPORATION;REEL/FRAME:005077/0379
Effective date: 19880725
Owner name: COOPER POWER SYSTEMS, INC.,, STATELESS
Free format text: CHANGE OF NAME;ASSIGNOR:COOPER POWER ACQUISTION COMPANY;REEL/FRAME:005060/0052
Effective date: 19881114