US3581154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surge-deflecting cable terminator
Assignee: Individual
•
Filing: 1968-11-18
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Granted: 1971-05-25
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Expires: 1988-11-18
Abstract
Abstract A weathertight surge-responsive electrical cable terminator, adapted for use in connecting an underground insulated cable to an exposed overhead conductor, includes a housing of insulating material in which the cable end is hermetically sealed alongside a member of magnetic material. Lightning surges transmitted by the exposed overhead conductor to the point of connection are deflected by the electromagnetic cooperation of the magnetic member with the surge current upon its appearance in the terminator. The terminator is effective either as a reflector to turn the surge back to the overhead conductor, or as a diverter to direct the surge to an associated lightning arrester.
Inventors
- 👤 J Hebden Willox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:52
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/02; H02G15/06; H02G15/064; H02G15/068; H01; H01T; H01T4/00; H01T4/08
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
122 words
A surge-responsive terminator for underground cable comprising a housing of insulating material, magnetic means disposed within said housing, said magnetic means including at least one discrete member of magnetic material, an elongated cavity within said housing for receiving an end portion of the type of electrical cable which includes a central conductor and a concentric jacket of insulation over the conductor, said cavity extending adjacent to and alongside said magnetic means, said magnetic means being effective to influence the electromagnetic field about the end portion of a cable conductor disposed in said cavity in response to the time rate of change of an electrical current occurring therein, and terminal means at the cable end of said housing for connection to said conductor.
Claim 2
Dependent Claim
122 words
A surge-responsive terminator for underground cable comprising a housing of insulating material, magnetic means disposed within said housing, said magnetic means including at least one discrete member of magnetic material, an elongated cavity within said housing for receiving an end portion of the type of electrical cable which includes a central conductor and a concentric jacket of insulation over the conductor, said cavity extending adjacent to and alongside said magnetic means, said magnetic means being effective to influence the electromagnetic field about the end portion of a cable conductor disposed in said cavity in response to the time rate of change of an electrical current occurring therein, and terminal means at the cable end of said housing for connection to said conductor.
Claim 3
Dependent Claim
21 words
The terminator as defined in claim 1, wherein said magnetic means comprises a member of magnetic material surrounding said end portion.
Claim 4
Dependent Claim
62 words
The terminator as claimed in claim 1, wherein the magnetic means within the housing is effective to augment the electromagnetic field about the housed end portion of the cable in response to the timE rate of change of an electrical current occurring therein to an intensity substantially greater than that due to the self-induction of the housed portion absent said magnetic means.
Claim 5
Dependent Claim
28 words
The terminator according to claim 3, wherein said magnetic means is formed as a hollow cylinder of magnetic material through which the terminal portion of said conductor extends.
Claim 6
Dependent Claim
49 words
The terminator according to claim 2, wherein a portion of said jacket of insulation is removed to bare a terminal portion of said conductor, and said magnetic means is formed as a cylinder of magnetic material having a central bore through which the terminal portion of the conductor extends.
Claim 7
Dependent Claim
29 words
The terminator as claimed in claim 3, in which said magnetic means comprises a stacked group of discrete rings of magnetic material through which said housed end portion extends.
Claim 8
Dependent Claim
31 words
The terminator in accordance with claim 2, wherein said magnetic means is composed of a material selected from a group of magnetic alloys having a saturation intensity greater than pure iron.
Claim 9
Dependent Claim
25 words
The terminator as claimed in claim 4, in which said magnetic means comprises a member of magnetic material composed of a high saturation cobalt-iron alloy.
Claim 10
Dependent Claim
19 words
The terminator according to claim 6, wherein said rings of magnetic material are each constituted as a sintered ferrite.
Claim 11
Dependent Claim
18 words
The terminator as claimed in claim 2, including a weathertight closure at the outlet end of said housing.
Claim 12
Dependent Claim
183 words
A weathertight surge-responsive terminator adapted for use in electrically connecting a shielded underground cable to an exposed overhead conductor, said cable including a central conductor, a covering of insulation over said conductor and a conducting ground shield over said insulation, an end portion of said ground shield being removed from said cable to provide an insulated unshielded elongated end portion; said terminator comprising a tubular housing of insulating material having an annularly corrugated exterior and an elongated interior cavity for receiving the unshielded elongated end portion of said cable, terminal means at the outlet end of said housing connected to said central conductor, magnetic means disposed within said cavity adjacent to said terminal means, said magnetic means encompassing said conductor and being susceptible to electromagnetic induction upon the passage of a time rate of change of electrical current magnitude therein, closure means associated with the outlet end of said housing, and a stress-relief cone of conducting material fitted over the other end of said housing, said cable extending through said other end of said housing in electrical contact with said conducting ground shield.
Claim 13
Dependent Claim
183 words
A weathertight surge-responsive terminator adapted for use in electrically connecting a shielded underground cable to an exposed overhead conductor, said cable including a central conductor, a covering of insulation over said conductor and a conducting ground shield over said insulation, an end portion of said ground shield being removed from said cable to provide an insulated unshielded elongated end portion; said terminator comprising a tubular housing of insulating material having an annularly corrugated exterior and an elongated interior cavity for receiving the unshielded elongated end portion of said cable, terminal means at the outlet end of said housing connected to said central conductor, magnetic means disposed within said cavity adjacent to said terminal means, said magnetic means encompassing said conductor and being susceptible to electromagnetic induction upon the passage of a time rate of change of electrical current magnitude therein, closure means associated with the outlet end of said housing, and a stress-relief cone of conducting material fitted over the other end of said housing, said cable extending through said other end of said housing in electrical contact with said conducting ground shield.
Claim 14
Dependent Claim
36 words
The terminator in accordance with claim 11, wherein said housing includes at the outlet end a coextensive hollow cylindrical extension of insulating material defining an inwardly enlarged end portion in which said magnetic means is disposed.
Claim 15
Dependent Claim
50 words
The terminator according to claim 12, in which a portion of the jacket of insulation is removed to bare a terminal portion of said cable conductor, and said magnetic means is in the form of a hollow cylinder of magnetic material through which the terminal portion of said conductor extends.
Claim 16
Dependent Claim
34 words
The terminator as claimed in claim 13, wherein said magnetic means is composed of a material selected from a group of iron alloys having a magnetic saturation intensity greater than that of pure iron.
Claim 17
Dependent Claim
22 words
The terminator as defined in claim 13, in which the cylinder of magnetic material is composed of a high-saturation intensity cobalt alloy.
Claim 18
Dependent Claim
63 words
The terminator as defined in claim 12, in which an end portion of the insulation is removed to bare an end portion of the cable conductor within the housing, and said magnetic means comprises a group of similar annular plates stacked in face-to-face abutting relationship, the uninsulated end portion of the cable conductor extending along and through the respective openings of said plates.
Claim 19
Independent Claim
179 words
A system for precluding damage to an unDerground cable from excessively high surge voltages transmitted into the underground cable from a point of connection with an overhead line exposed to lightning strokes, said system comprising in combination an exposed overhead conductor electrically connected to a ground-shielded insulated underground conductor, a lightning arrester connected between said overhead conductor and ground, said arrester having a predetermined voltage sparkover characteristics, and a surge-responsive terminator connected in parallel circuit relation with said lightning arrester, said terminator comprising a housing of insulating material having an elongated cavity for receiving an end portion of said cable, terminal conducting means at one end of said housing connected to the underground cable conductor interior of said housing and to the overhead conductor exterior of said housing, and surge-sensitive means associated with said end portion of said cable within said housing, said surge-sensitive means cooperating with said cable to effect sparkover of said arrester when a surge current having a predetermined time rate of rise moves from said exposed overhead conductor across said end portion of said cable.
Claim 20
Independent Claim
179 words
A system for precluding damage to an unDerground cable from excessively high surge voltages transmitted into the underground cable from a point of connection with an overhead line exposed to lightning strokes, said system comprising in combination an exposed overhead conductor electrically connected to a ground-shielded insulated underground conductor, a lightning arrester connected between said overhead conductor and ground, said arrester having a predetermined voltage sparkover characteristics, and a surge-responsive terminator connected in parallel circuit relation with said lightning arrester, said terminator comprising a housing of insulating material having an elongated cavity for receiving an end portion of said cable, terminal conducting means at one end of said housing connected to the underground cable conductor interior of said housing and to the overhead conductor exterior of said housing, and surge-sensitive means associated with said end portion of said cable within said housing, said surge-sensitive means cooperating with said cable to effect sparkover of said arrester when a surge current having a predetermined time rate of rise moves from said exposed overhead conductor across said end portion of said cable.
Claim 21
Dependent Claim
23 words
The system in accordance with claim 17, wherein said surge-sensitive means includes at least one member of magnetic material surrounding said underground conductor.
Claim 22
Dependent Claim
34 words
The system as claimed in claim 18, in which said ground-shielded cable includes an outer grounded conducting cover and said lightning arrester is connected between said overhead conductor and said outer grounded conducting cover.
Claim 23
Dependent Claim
47 words
The system as claimed in claim 19, including a stress-relief cone of electrically conducting material fitted over the end of the housing through which said cable is received, said relief cone abutting the outer surface of a portion of said grounded conducting cover in electrical contact therewith.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |