US3273017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ground fault responsive directional comparison protective system for an electric powder transmission line
Assignee: General Electric Co
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Filing: 1963-01-07
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Granted: 1966-09-13
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Expires: 1983-01-07
Abstract
No abstract record available.
Inventors
- 👤 Charles A Mathews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:49
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/26; H02H3/28; H02H3/30; H02H3/307; H02H7/00; H02H7/26; H02H7/261; H02H7/262
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
301 words
A DIRECTIONAL COMPARISON PROTECTIVE RELAYING SYSTEM FOR INITIATING A PREDETERMINED CONTROL FUNCTION IN RESPONSE TO THE OCCURRENCE OF A GROUND FAULT ON A POLYPHASE A.-C. ELECTRIC POWER TRANSMISSION LINE HAVING DISTANTLY SPACED TERMINALS AT EACH OF WHICH ARE LOCATED SIGNAL TRANSMITTING AND RECEIVING MEANS SO ARRANGED THAT THE TRANSMITTING MEANS AT EACH TERMINAL CAN COMMUNICATE WITH THE RECEIVING MEANS AT ANY OF SAID TERMINALS REMOTE THEREFROM, COMPRISING AT EACH OF THE LINE TERMINALS: (A) FIRST GROUND FAULT RESPONSIVE MEANS ADAPTED TO BE COUPLED TO THE LINE AND TO THE LOCAT TRANSMITTING MEANS FOR ACTIVATING SAID TRANSMITTING MEANS WHEN THE MAGNITUDE OF THE ZERO-PHASE-SEQUENCE COMPONENT OF THE CURRENT EXCEEDS A PREDETERMINED FIRST AMOUNT; (B) GROUND CURRENT DIRECTIONAL SENSING MEANS CONNECTED TO THE FIRST GROUND FAULT RESPONSIVE MEANS AND ADAPTED TO BE COUPLED TO THE LINE FOR OPERATION IN RESPONSE TO ZERO-PHAE-SEQUENCE LINE CURRENT OF A MAGNITUDE EXCEEDING SAID FIRST AMOUNT FLOWING TOWARD A GROUND FAULT LOCATED ON THE PROTECTED-LINE SIDE OF THE LOCAT TERMINAL; (C) FIRST CONTROL MEANS FOR CONNECTING THE GROUND CURRENT DIRECTIONAL SENSING MEANS TO THE LOCAT TRANSMITTING MEANS TO DEACTIVATE SAID TRANSMITTING MEANS IN RESPONSE TO OPERATION OF SAID SENSING MEANS; (D) SECOND GROUNDFAULT RESPONSIVE MEANS ADAPTED TO BE COUPLED TO THE LINE FOR OPERATION WHEN THE MAGNITUDE OF ZERO-PHASE-SEQUENCE LINE CURRENT EXCEEDS A PREDETERMINED SECOND AMOUNT WHICH IS GREATER THAN SAID FIRST AMOUNT; AND (E) SECOND CONTROL MEANS CONNECTED TO BOTH SAID SENSING MEANS AND SAID SECOND GROUND FAULT RESPONSIVE MEANS AND RESPONSIVE TO THEIR CONTEMPORANEOUS OPERATIONS FOR EFFECTING INITIATION OF THE PREDETERMINED CONTROL FUNCTION, SAID SECOND CONTROL MEANS ADDITIONALLY BEING ADAPTED TO BE CONNECTED TO THE LOCAL RECEIVING MEANS AND BEING SO ARRANGED AS TO BE RENDERED INEFFECTIVE TO INITIATE SAID CONTROL FUNCTION WHENEVER SAID RECEIVING MEANS IS RECEIVING A SIGNAL FROM AN ACTIVE REMOTE TRANSMITTING MEANS.
Claim 2
Dependent Claim
301 words
A DIRECTIONAL COMPARISON PROTECTIVE RELAYING SYSTEM FOR INITIATING A PREDETERMINED CONTROL FUNCTION IN RESPONSE TO THE OCCURRENCE OF A GROUND FAULT ON A POLYPHASE A.-C. ELECTRIC POWER TRANSMISSION LINE HAVING DISTANTLY SPACED TERMINALS AT EACH OF WHICH ARE LOCATED SIGNAL TRANSMITTING AND RECEIVING MEANS SO ARRANGED THAT THE TRANSMITTING MEANS AT EACH TERMINAL CAN COMMUNICATE WITH THE RECEIVING MEANS AT ANY OF SAID TERMINALS REMOTE THEREFROM, COMPRISING AT EACH OF THE LINE TERMINALS: (A) FIRST GROUND FAULT RESPONSIVE MEANS ADAPTED TO BE COUPLED TO THE LINE AND TO THE LOCAT TRANSMITTING MEANS FOR ACTIVATING SAID TRANSMITTING MEANS WHEN THE MAGNITUDE OF THE ZERO-PHASE-SEQUENCE COMPONENT OF THE CURRENT EXCEEDS A PREDETERMINED FIRST AMOUNT; (B) GROUND CURRENT DIRECTIONAL SENSING MEANS CONNECTED TO THE FIRST GROUND FAULT RESPONSIVE MEANS AND ADAPTED TO BE COUPLED TO THE LINE FOR OPERATION IN RESPONSE TO ZERO-PHAE-SEQUENCE LINE CURRENT OF A MAGNITUDE EXCEEDING SAID FIRST AMOUNT FLOWING TOWARD A GROUND FAULT LOCATED ON THE PROTECTED-LINE SIDE OF THE LOCAT TERMINAL; (C) FIRST CONTROL MEANS FOR CONNECTING THE GROUND CURRENT DIRECTIONAL SENSING MEANS TO THE LOCAT TRANSMITTING MEANS TO DEACTIVATE SAID TRANSMITTING MEANS IN RESPONSE TO OPERATION OF SAID SENSING MEANS; (D) SECOND GROUNDFAULT RESPONSIVE MEANS ADAPTED TO BE COUPLED TO THE LINE FOR OPERATION WHEN THE MAGNITUDE OF ZERO-PHASE-SEQUENCE LINE CURRENT EXCEEDS A PREDETERMINED SECOND AMOUNT WHICH IS GREATER THAN SAID FIRST AMOUNT; AND (E) SECOND CONTROL MEANS CONNECTED TO BOTH SAID SENSING MEANS AND SAID SECOND GROUND FAULT RESPONSIVE MEANS AND RESPONSIVE TO THEIR CONTEMPORANEOUS OPERATIONS FOR EFFECTING INITIATION OF THE PREDETERMINED CONTROL FUNCTION, SAID SECOND CONTROL MEANS ADDITIONALLY BEING ADAPTED TO BE CONNECTED TO THE LOCAL RECEIVING MEANS AND BEING SO ARRANGED AS TO BE RENDERED INEFFECTIVE TO INITIATE SAID CONTROL FUNCTION WHENEVER SAID RECEIVING MEANS IS RECEIVING A SIGNAL FROM AN ACTIVE REMOTE TRANSMITTING MEANS.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |