Patent US3202875A successfully refreshed from Google Patents.
US3202875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective relay system
Assignee: General Electric Co
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Filing: 1960-06-23
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Granted: 1965-08-24
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Expires: 1980-06-23
Abstract
No abstract record available.
Inventors
- 👤 Amos W Bateman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:00
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/42; H02H3/422
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
IN A PRTOECTIVE SYSTEM FOR A GORUNDED NEUTAL POLYPHASE SYSTEM HAVING APLURALITY OF PHASE CONDUCTORS THROUGH WHICH CURRENTS ENGER AND LEAVE THE SYSTEM, A FIRST CURRENT TRANSFORMER CONNECTED IN THE NEUTRAL TO GROUND CONNECTION OF SAID SYSTEM, SAID FIRST CURRENT TRANSFORMER HAVING A SECONDARY WINDING, A PRODUCT TYPE DIRECTIONAL RELAY HAVING FIRST AND SECOND COOPERATING COILS CONNECTED IN SERIES RELATIONSHIP WITH EACH OTHER ACROSS THE SECONDARY WINDING OF AID FIRST CURRENT TRANSFORMER FOR OPRATION OF SAID RELAY IN A PREDTERRMINED DIRECTION IN SRSPONSE TO AN INTERNAL GROUND FAULT, AND A WINDOW TYPE CURRENT TRANSFORMER HAVING A LOWER TURNS RATIO THAN SAID FIRST TRANSFORMER SURROUNDING ALL SAID PHASE CONDUCTORS, SAID WINDOW TYPE CURREINT TRANSFORMER HAVING A SECONDARY WINDING CONNECTED ACROSS ONE OF SAID COILS TO EFFECT ENERGIZATION OF SAID COILS IN RESPONSE TO AN EXTERNAL GROUND FAULT IN DIRECTIONS TO PREVENT OPERATION OF SAID RELAY IN SAID PREDETERMINED DIRECTION.
Claim 2
Dependent Claim
148 words
IN A PRTOECTIVE SYSTEM FOR A GORUNDED NEUTAL POLYPHASE SYSTEM HAVING APLURALITY OF PHASE CONDUCTORS THROUGH WHICH CURRENTS ENGER AND LEAVE THE SYSTEM, A FIRST CURRENT TRANSFORMER CONNECTED IN THE NEUTRAL TO GROUND CONNECTION OF SAID SYSTEM, SAID FIRST CURRENT TRANSFORMER HAVING A SECONDARY WINDING, A PRODUCT TYPE DIRECTIONAL RELAY HAVING FIRST AND SECOND COOPERATING COILS CONNECTED IN SERIES RELATIONSHIP WITH EACH OTHER ACROSS THE SECONDARY WINDING OF AID FIRST CURRENT TRANSFORMER FOR OPRATION OF SAID RELAY IN A PREDTERRMINED DIRECTION IN SRSPONSE TO AN INTERNAL GROUND FAULT, AND A WINDOW TYPE CURRENT TRANSFORMER HAVING A LOWER TURNS RATIO THAN SAID FIRST TRANSFORMER SURROUNDING ALL SAID PHASE CONDUCTORS, SAID WINDOW TYPE CURREINT TRANSFORMER HAVING A SECONDARY WINDING CONNECTED ACROSS ONE OF SAID COILS TO EFFECT ENERGIZATION OF SAID COILS IN RESPONSE TO AN EXTERNAL GROUND FAULT IN DIRECTIONS TO PREVENT OPERATION OF SAID RELAY IN SAID PREDETERMINED DIRECTION.
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) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |