Underground electric power cable fuse housing having a semi-conductive corona shield
Abstract
Abstract A FUSE HOUSING FOR AN UNDERGROUND ELECTRIC DISTRIBUTION SYSTEM IS FORMED WITH A WATER-TIGHT FUSE ENCLOSING CHAMBER, THE INNER WALLS OF WHICH ARE COATED WITH A LAYER OF SEMI-CONDUCTIVE MATERIAL WHICH IS ELECTRICALLY COUPLED TO BOTH TERMINALS OF A FUSE MOUNTED THEREIN. THUS, THE VOLTAGE DIFFERENTIAL BETWEEN THE OUTER SURFACE OF THE FUSE CARTRIDGE AND THE INNER SURFACE OF THE FUSE HOUSING IS REDUCED TO A LOW LEVEL SUCH THAT CORONA IS NOT DEVELOPED BETWEEN THESE TWO SURFACES. IN ORDER TO LIMIT THE AMOUNT OF LEAKAGE CURRENT FLOWING THROUGH THE SEMI-CONDUCTIVE COATING ON THE FUSE HOUSING''S INNER SURFACE, THE TEERMINALTO-TERMINAL RESISTANCE OF THIS COATING IS IN EXCESS OF 10 MEGOHMS.
Inventors
- 👤 Samuel G Hardy
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |