Patent US3629658A successfully refreshed from Google Patents.
US3629658A
Expired / Lapsed
US
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Static impedance relay
Assignee: ABB Norden Holding AB
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Filing: 1970-05-07
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Granted: 1971-12-21
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Expires: 1990-05-07
Abstract
Abstract A static impedance relay for controlling a circuit includes a switch operated by a relay coil which is connected to a zero detector. The zero detector is fed with a first pulsating voltage which is proportional to the current supplied and a second voltage which is the algebraic sum of a direct voltage proportional to the voltage supply and a second pulsating voltage adjustably proportional to the voltage supply.
Inventors
- 👤 Anders Helge
- 👤 Torkel Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:25
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
Static impedance relay comprising a current circuit, a voltage circuit and a zero detector connected to both circuits, the current circuit including means to generate a first pulsating voltage which is proportional to the current supplied, the voltage circuit comprising a first circuit part including means to generate a direct voltage which is proportional to the voltage supplied and a second circuit part including means to generate a second pulsating voltage which is proportional to the voltage supplied, means to form the algebraic sum of the direct and second pulsating voltages, said zero detector connected to be responsive to the difference between the absolute values of said first pulsating voltage and said sum.
Claim 2
Dependent Claim
113 words
Static impedance relay comprising a current circuit, a voltage circuit and a zero detector connected to both circuits, the current circuit including means to generate a first pulsating voltage which is proportional to the current supplied, the voltage circuit comprising a first circuit part including means to generate a direct voltage which is proportional to the voltage supplied and a second circuit part including means to generate a second pulsating voltage which is proportional to the voltage supplied, means to form the algebraic sum of the direct and second pulsating voltages, said zero detector connected to be responsive to the difference between the absolute values of said first pulsating voltage and said sum.
Claim 3
Dependent Claim
28 words
Impedance relay according to claim 1, the current circuit comprising a full-wave rectifier (10), and the means for generating the second pulsating voltage comprising a full-wave rectifier (43).
Claim 4
Dependent Claim
30 words
Impedance relay according to claim 1, the current circuit comprising a half-wave rectifier (19), and the means to generate the second pulsating voltage including means to generate an alternating voltage.
Claim 5
Dependent Claim
75 words
Impedance relay according to claim 1, in which the voltage circuit includes a voltage transformer (20) having a primary winding (21) and a first and a second secondary winding (22, 23), the first circuit part being connected to the first secondary winding and the second circuit part connected to the second secondary winding, the second secondary winding having a plurality of outputs (40, 41, 42) to adjust the desired amplitude of the second pulsating voltage.
References Cited (Backward Citations)
US2495166A
Cited
US3543092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |