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US5023745A
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Surge arrestor apparatus and method
Assignee: Erico International Corp
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Filing: 1989-09-06
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Granted: 1991-06-11
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Expires: 2009-09-06
Abstract
Abstract Surge arrestor assemblies for railroad and like circuits utilize a high surface area to cross-sectional area, broadband equal potential grounding plane which is in the form of a loop. Surges are electrically coupled to the broadband equipotential grounding plane through surge arrestors. The assembly ensures that each arrestor "see's" the same impedance so that the voltage seen at the equipment is controlled. The grounding member is supported in recesses in mounting blocks which maintain its planar condition, and which also facilitate the connections to ground, lines, arresters and equipment.
Inventors
- 👤 John C. Glass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:42
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/044
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
90 words
A device for grounding an electrical surge in a circuit used in a railroad application, comprising: a grounding member having a high surface to cross-sectional area ratio for facilitating the low impedance conductance of high frequency electrical energy; a plurality of conductors for the conductance of electrical signals from a power source to a load; and, a plurality of surge arrestors electrically connected to said conductors and said grounding member for grounding any of such electrical signals to said grounding member when any of such signals exceeds a predetermined voltage.
Claim 2
Independent Claim
90 words
A device for grounding an electrical surge in a circuit used in a railroad application, comprising: a grounding member having a high surface to cross-sectional area ratio for facilitating the low impedance conductance of high frequency electrical energy; a plurality of conductors for the conductance of electrical signals from a power source to a load; and, a plurality of surge arrestors electrically connected to said conductors and said grounding member for grounding any of such electrical signals to said grounding member when any of such signals exceeds a predetermined voltage.
Claim 3
Dependent Claim
21 words
A device as set forth in claim 1, wherein said grounding member is continuously conductive between all surge arrestors mounted thereon.
Claim 4
Dependent Claim
14 words
A device as set forth in claim 2, wherein said grounding member is flat.
Claim 5
Dependent Claim
20 words
A device as set forth in claim 3, wherein said flat grounding member is in the form of a rectangle.
Claim 6
Dependent Claim
14 words
A device as set forth in claim 4, wherein said grounding member is copper.
Claim 7
Dependent Claim
24 words
A device as set forth in claim 5, wherein said flat grounding member has a width to thickness ratio of approximately 30 to 1.
Claim 8
Dependent Claim
14 words
A device as set forth in claim 2, wherein said grounding member is tubular.
Claim 9
Independent Claim
89 words
A device for grounding surges of electrical energy in circuits used in a railroad application, comprising: a continuous conductive loop having a substantially equal impedance to ground at all points on the loop a plurality of conductors for the conductance of electrical signals from at least one power source to a plurality of loads; and, a plurality of surge arrestors electrically connected to said conductors and said continuous conductive loop for grounding any of such electrical signals to said loop when any of such signals exceeds a predetermined voltage.
Claim 10
Independent Claim
89 words
A device for grounding surges of electrical energy in circuits used in a railroad application, comprising: a continuous conductive loop having a substantially equal impedance to ground at all points on the loop a plurality of conductors for the conductance of electrical signals from at least one power source to a plurality of loads; and, a plurality of surge arrestors electrically connected to said conductors and said continuous conductive loop for grounding any of such electrical signals to said loop when any of such signals exceeds a predetermined voltage.
Claim 11
Dependent Claim
20 words
A device as set forth in claim 8, wherein said continuous conductive loop is in the form of a rectangle.
Claim 12
Dependent Claim
31 words
A device as set forth in claim 9, said continuous conductive loop having a high surface to cross-sectional area ratio for facilitating the low impedance conductance of high frequency electrical energy.
Claim 13
Dependent Claim
35 words
A device as set forth in claim 10, wherein said continuous conductive loop has long sides sufficiently short to facilitate low impedance conductance of high frequency electrical energy below the resonant frequency of the side.
Claim 14
Independent Claim
77 words
A method of grounding a surge of electrical energy in railroad circuits, comprising the steps of: tapping such electrical signal conducted through a circuit; electrically coupling such electrical signal to a grounding path when the potential difference between such electrical signal and ground exceeds a predetermined voltage; and, conducting such electrical signal to ground along a grounding path having a high surface to cross-sectional area ratio for facilitating the low impedance conductance of high frequency electrical energy.
Claim 15
Independent Claim
77 words
A method of grounding a surge of electrical energy in railroad circuits, comprising the steps of: tapping such electrical signal conducted through a circuit; electrically coupling such electrical signal to a grounding path when the potential difference between such electrical signal and ground exceeds a predetermined voltage; and, conducting such electrical signal to ground along a grounding path having a high surface to cross-sectional area ratio for facilitating the low impedance conductance of high frequency electrical energy.
Claim 16
Dependent Claim
28 words
A method as set forth in claim 12, wherein said step of conducting includes conducting such electrical signal along a grounding path in the form of a loop.
Claim 17
Dependent Claim
78 words
A mounting block assembly for conductive elements in a railroad circuit surge arrestor sub-assembly, comprising: a plurality of highly insulative mounting blocks, each including a top surface having a flat recess for orienting a flat grounding member therein, a bottom surface having a cavity for containing conductive elements, and a plurality of additional recesses located in such top and bottom surfaces maintaining a sufficient air gap between conductive elements mounted therein to prevent electrical discharge between such elements.
Claim 18
Dependent Claim
78 words
A mounting block assembly for conductive elements in a railroad circuit surge arrestor sub-assembly, comprising: a plurality of highly insulative mounting blocks, each including a top surface having a flat recess for orienting a flat grounding member therein, a bottom surface having a cavity for containing conductive elements, and a plurality of additional recesses located in such top and bottom surfaces maintaining a sufficient air gap between conductive elements mounted therein to prevent electrical discharge between such elements.
Claim 19
Dependent Claim
19 words
A mounting block assembly as set forth in claim 14, wherein said mounting blocks are constructed of a resin.
Claim 20
Dependent Claim
25 words
A mounting block assembly as set forth in 15 wherein said flat recess is the same depth as the thickness of said flat grounding member.
Claim 21
Dependent Claim
25 words
A mounting block assembly as set forth in 15 wherein said flat recess is the same depth as the thickness of said flat grounding member.
Claim 22
Dependent Claim
33 words
A mounting block assembly as set forth in claim 16 including a threaded insert in said block flush with the top of said flat recess to facilitate electrical connection to said grounding member.
Claim 23
Dependent Claim
36 words
A mounting block assembly as set forth claim 17 including two threaded inserts in said block flush with the top of said flat recess to either or both of which such electrical connection can be made.
Claim 24
Dependent Claim
39 words
In electrical circuits, a low impedance equipotential grounding plane supported in a recess in a plurality of mounting blocks with a surface exposed for mounting surge arrestors thereto each at a fixed distance with respect to said equipotential plane.
Claim 25
Dependent Claim
39 words
In electrical circuits, a low impedance equipotential grounding plane supported in a recess in a plurality of mounting blocks with a surface exposed for mounting surge arrestors thereto each at a fixed distance with respect to said equipotential plane.
Claim 26
Dependent Claim
17 words
A device as set forth in claim 19 wherein said plane is recessed in each mounting block.
Claim 27
Dependent Claim
27 words
A device as set forth in claim 20 including a threaded insert in said mounting block to facilitate the connection of a surge arrestor to said plane.
Claim 28
Dependent Claim
13 words
A device as set forth in claim 20 wherein said plane is flat.
Claim 29
Dependent Claim
20 words
A device as set forth in claim 20 wherein said plane has a high surface to cross sectional area ratio.
Claim 30
Dependent Claim
13 words
A device as set forth in claim 20 wherein said plane is tubular.
Claim 31
Dependent Claim
14 words
A device as set forth in claim 20 wherein said plane is Litz wire.
References Cited (Backward Citations)
US3987343A
Cited
US4635160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |