Dynamoelectric machine with differential protection system including means for air gap monitoring
Abstract
Abstract A DYNAMOELECTRIC MACHINE IS PROVIDED WITH AN IMPROVED SYSTEM FOR PROTECTING AGAINST ABNORMAL CONDITIONS WHEREIN THE STATOR WINDINGS FOR EACH ELECTRICAL PHASE INCLUDE A PLURALITY OF PARALLEL WINDING PORTIONS MUTUALLY CONNECTED TO AN EXTERNAL LEAD WITH CURRENT TRANSFORMERS ON EACH PARALLEL FOR SENSING CONDITIONS THEREIN AND DETECTING UNBALANCED CONDITIONS THEREBETWEEN SUCH AS MAY BE CAUSED BY AIR GAP NON-UNIFORMITY. AN ADDITIONAL CURRENT TRANSFORMER IS PROVIDED ON THE EXTERNAL LEAD FOR A GIVEN PHASE AND INTERCONNECTED, SUCH AS THROUGH APPROPRIATE RELAYING MEANS, TO THE CURRENT TRANSFORMERS ON THE INDIVIDUAL PARALLELS FOR DETECTING OVERALL MACHINE UNBALANCES. THE INVENTION IS PARTICULARLY BENEFICIAL IN MACHINES SUCH AS LARGE GENERATORS WHERE IT IS IMPORTANT TO INSURE STABLE AIR GAP DISTRIBUTION WHILE MINIMIZING THE NUMBER AND SIZE OF NECESSARY CONDUCTORS.
Inventors
- 👤 E Whitney
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |