Patent US3870925A successfully refreshed from Google Patents.
US3870925A
Expired / Lapsed
US
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Earth grid
Assignee: Unisearch Ltd
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Filing: 1974-05-01
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Granted: 1975-03-11
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Expires: 1994-05-01
Abstract
Abstract An earth grid for the switching yards and distribution yards associated with electric power stations and substations is provided in which the conductors of the interconnected mesh of conductors forming the grid are aligned at an angle of between 30* and 60* with the direction of the switching yard bus bars and feeders.
Inventors
- 👤 Richard Meredith Huey
- 👤 Krishna Rajaratnam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:04
CPC Classifications
H; H02; H02B; H02B13/00; H02B13/02; H02B13/035; H02B13/075
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
An earth grid, for earthing electrically conductive structures associated with at least one array of parallel bus bars or feeders, or a plurality of such arrays arranged at right angles to each other, said earth grid comprising a horizontal planar substantially regular parallelogrammatic mesh formed by two intersecting and interconnected sets of mutually parallel earth grid conductors and a plurality of electrically conductive earth risers, one or more of said earth risers being connected to each said structure from said mesh and said mesh being electrically connected to a neutral point associated with said bus bars or feeders and/or earth wherein the mutually parallel earth grid conductors of each said set are oriented in a direction forming an angle of between thirty and sixty degrees with the direction of said bus bars or feeders.
Claim 2
Dependent Claim
134 words
An earth grid, for earthing electrically conductive structures associated with at least one array of parallel bus bars or feeders, or a plurality of such arrays arranged at right angles to each other, said earth grid comprising a horizontal planar substantially regular parallelogrammatic mesh formed by two intersecting and interconnected sets of mutually parallel earth grid conductors and a plurality of electrically conductive earth risers, one or more of said earth risers being connected to each said structure from said mesh and said mesh being electrically connected to a neutral point associated with said bus bars or feeders and/or earth wherein the mutually parallel earth grid conductors of each said set are oriented in a direction forming an angle of between thirty and sixty degrees with the direction of said bus bars or feeders.
Claim 3
Dependent Claim
134 words
An earth grid, for earthing electrically conductive structures associated with at least one array of parallel bus bars or feeders, or a plurality of such arrays arranged at right angles to each other, said earth grid comprising a horizontal planar substantially regular parallelogrammatic mesh formed by two intersecting and interconnected sets of mutually parallel earth grid conductors and a plurality of electrically conductive earth risers, one or more of said earth risers being connected to each said structure from said mesh and said mesh being electrically connected to a neutral point associated with said bus bars or feeders and/or earth wherein the mutually parallel earth grid conductors of each said set are oriented in a direction forming an angle of between thirty and sixty degrees with the direction of said bus bars or feeders.
Claim 4
Dependent Claim
134 words
An earth grid, for earthing electrically conductive structures associated with at least one array of parallel bus bars or feeders, or a plurality of such arrays arranged at right angles to each other, said earth grid comprising a horizontal planar substantially regular parallelogrammatic mesh formed by two intersecting and interconnected sets of mutually parallel earth grid conductors and a plurality of electrically conductive earth risers, one or more of said earth risers being connected to each said structure from said mesh and said mesh being electrically connected to a neutral point associated with said bus bars or feeders and/or earth wherein the mutually parallel earth grid conductors of each said set are oriented in a direction forming an angle of between thirty and sixty degrees with the direction of said bus bars or feeders.
Claim 5
Dependent Claim
33 words
The earth grid as claimed in claim 1 wherein at least some of said earth risers are joined to said grid conductors at a point of interconnection between at least two grid conductors.
Claim 6
Dependent Claim
32 words
The earth grid as claimed in claim 1 wherein at least some of said earth risers are joined to said grid conductors midway between the points of interconnection of said grid conductors.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |