US4587077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety actuator release device
Assignee: Merlin Gerin SA
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Filing: 1982-12-10
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Granted: 1986-05-06
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Expires: 2002-12-10
Abstract
Abstract Safety actuator release device incorporating a release means, whereof one output supplies an output signal which can have two logic states, one of these states corresponding to the release of the actuator and the other state corresponding to the absence of the release of the actuator, testing and control means of said release means, whereby said testing and control means have two control inputs receiving the control signals from the release means in order that the output signal has one of two logic states and a test input receiving a test signal in such a way that said output supplies an output signal, whose logic state corresponds to the release of the actuator, even if the control signals lead to the supply of an output signal corresponding to the absence of release, wherein the testing and control means are constituted by three primary windings of a magnetic amplifier, two of these primary windings receiving direct currents corresponding to the control signals, while another of these windings is a test winding receiving a direct current corresponding to the test signal, the release means being constituted by a secondary winding of the magnetic amplifier, said secondary winding beign connected to an alternating current supply, the actuator being connected to this winding via a bridge rectifier. Application to the protection of nuclear reactors.
Inventors
- 👤 Anatole Bessedine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:19
CPC Classifications
G; G21; G21C; G21C17/00; H; H03; H03K; H03K19/00; H03K19/02; H03K19/16; H03K19/003; H03K19/00392; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
263 words
A safety actuator release device, comprising, release means (P i ), one output (S) of said release means supplying an output signal which can have two logic states, one of said states corresponding to release of the actuator (D) and the other state corresponding to actuation of said actuator; testing and control means (P 1 , P 2 , P 3 ) for said release means (P i ), said testing and control means having two control inputs (E 1 , E 2 ) receiving control signals from said release means in order that said output signal has one of two logic states and a test input (E 3 ) receiving a test signal, said output supplying in response to said test signal an output signal, whose logic state corresponds to the release of the actuator, and overriding any control signals which would otherwise cause an output signal corresponding to actuation of said actuator, said testing and control means (P 1 , P 2 , P 3 ,) comprising three primary windings of a magnetic amplifier, two of said primary windings (P 1 , P 2 ) receiving direct currents corresponding to said control signals, and the remaining winding (P 3 ) being a test winding and receiving a direct current corresponding to the test signal, said release means being a secondary winding (P i ) of the magnetic amplifier, said secondary winding being connected to an alternating current supply, and said actuator (D) being connect to said secondary winding via a bridge rectifier (D 1 , D 2 , D 3 ).
Claim 2
Dependent Claim
263 words
A safety actuator release device, comprising, release means (P i ), one output (S) of said release means supplying an output signal which can have two logic states, one of said states corresponding to release of the actuator (D) and the other state corresponding to actuation of said actuator; testing and control means (P 1 , P 2 , P 3 ) for said release means (P i ), said testing and control means having two control inputs (E 1 , E 2 ) receiving control signals from said release means in order that said output signal has one of two logic states and a test input (E 3 ) receiving a test signal, said output supplying in response to said test signal an output signal, whose logic state corresponds to the release of the actuator, and overriding any control signals which would otherwise cause an output signal corresponding to actuation of said actuator, said testing and control means (P 1 , P 2 , P 3 ,) comprising three primary windings of a magnetic amplifier, two of said primary windings (P 1 , P 2 ) receiving direct currents corresponding to said control signals, and the remaining winding (P 3 ) being a test winding and receiving a direct current corresponding to the test signal, said release means being a secondary winding (P i ) of the magnetic amplifier, said secondary winding being connected to an alternating current supply, and said actuator (D) being connect to said secondary winding via a bridge rectifier (D 1 , D 2 , D 3 ).
Claim 3
Dependent Claim
190 words
A device according to claim 1, wherein the number of ampere turns of the windings are chosen in such a way that when the number of ampere turns of the primary windings (P 1 , P 2 , P 3 ) are zero, the average intensity of the current (I) corresponding to the output signal applied to the release device (D) is maximum and corresponds to the release logic state of the actuator, said intensity being below a predetermined threshold (I s ) and corresponding to the logic states of actuation when the number of ampere turns of the control windings (P 1 , P 2 ) are both, or in one case higher than a predetermined value when the number ampere turns of the test winding (P 3 ) is zero, said intensity being maximum and corresponding to the logic release state of the actuator (D) when the number of ampere turns of the control windings (P 1 , P 2 ) are both or one case higher than a predetermined value, whilst the number of ampere turns of the test winding (P 3 ) exceeds a predetermined value.
Claim 4
Dependent Claim
76 words
A device according to claim 2, wherein the number of turns of the test winding is double the number of turns of each control winding, the intensities of the currents circulating in the control windings and in the test winding being equal when the number of ampere turns of these windings exceeds the predetermined value, the direction of the current in the test winding being opposite to the direction of the currents in each control winding.
Claim 5
Dependent Claim
14 words
A device according to claim 2, wherein said bridge rectifier is a full-wave rectifier.
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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) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |