US3729654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital automatic transmitter-receiver tester
Assignee: QUADALL CO Inc
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Filing: 1971-08-02
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Granted: 1973-04-24
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Expires: 1991-08-02
Abstract
Abstract In a high voltage transmission line system having carriercurrent directional relay means connected therewith terminal circuit means are connected with the carrier-current system at remote locations. The carrier-current testing means includes a master or control station and one or more slave terminal circuit means remote from the control station and responsive to the control station for indicating a fault in carrier-current system. The circuit of the control station is actuated at predetermined times and an alarm means is tripped in response to a transmission fault between any two carrier-current stations tested.
Inventors
- 👤 D Yeager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:27
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H02H3/04; H02H3/044
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
173 words
Automatic relay carrier testing apparatus for high voltage transmission lines having protective relay means including a carrier-current transmitter and receiver interconnected between spaced transmission line stations, comprising: control circuit means connected to energize the transmitter at one said station; second circuit means connected to energize the transmitter at a remote said station; first control actuating means comprising timer means including a timer circuit having a normally open timer switch closed at predetermined times for energizing said control circuit means; a code signal generating circuit energized by said timer circuit; second actuating means for energizing said second circuit means in response to energization of said control circuit means; control program switch means providing a plurality of control signals at said one station; and, second program switch means synchronized with said control program switch means and providing a second plurality of control signals at said remote station, whereby said control program switch means and said second program switch means energize their respective transmitters in a predetermined order to verify the operation of the carriercurrent equipment.
Claim 2
Dependent Claim
173 words
Automatic relay carrier testing apparatus for high voltage transmission lines having protective relay means including a carrier-current transmitter and receiver interconnected between spaced transmission line stations, comprising: control circuit means connected to energize the transmitter at one said station; second circuit means connected to energize the transmitter at a remote said station; first control actuating means comprising timer means including a timer circuit having a normally open timer switch closed at predetermined times for energizing said control circuit means; a code signal generating circuit energized by said timer circuit; second actuating means for energizing said second circuit means in response to energization of said control circuit means; control program switch means providing a plurality of control signals at said one station; and, second program switch means synchronized with said control program switch means and providing a second plurality of control signals at said remote station, whereby said control program switch means and said second program switch means energize their respective transmitters in a predetermined order to verify the operation of the carriercurrent equipment.
Claim 3
Dependent Claim
34 words
The automatic relay carrier testing apparatus according to claim 1 in which said second actuating means includes: a code signal receiving circuit for actuating a code signal switch and energizing said second circuit means.
Claim 4
Dependent Claim
40 words
The automatic relay carrier testing apparatus according to claim 2 which further includes: means including an alarm circuit in said second circuit means for detecting a fault in the programed switching test and actuating an alarm at said one station.
Claim 5
Dependent Claim
95 words
The automatic relay carrier testing apparatus according to claim 3 and further including: a carrier send circuit in said control circuit means and said second circuit means to enable carrier transmission at said one station and said remote station in response to the operation of the respective program switch means; and, a carrier receive circuit in said control circuit means and said second circuit means to indicate carrier reception at said one station and said remote station in response to the operation of the respective program switch means and in sequence with carrier send transmission.
Claim 6
Dependent Claim
47 words
The automatic relay carrier testing apparatus according to claim 4 and further including: means including a time delay relay in said second circuit means for automatically recycling said second circuit means to a starting position upon failure of said second circuit means to complete a programed test.
Claim 7
Dependent Claim
44 words
The automatic relay carrier testing apparatus according to claim 5 in which said control program switch means includes: a control stepping relay having a plurality of interconnected contacts denoting a primary test and Having a second plurality of interconnected contacts denoting a secondary test.
Claim 8
Dependent Claim
31 words
The automatic relay carrier testing apparatus according to claim 6 in which said second program switch means includes: a second stepping relay responsive to the operation of said control stepping relay.
Claim 9
Dependent Claim
28 words
The automatic relay carrier testing apparatus according to claim 5 in which said control program switch means and said second program switch means each includes: binary counting means.
References Cited (Backward Citations)
US3414773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |