US3836822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus for temporarily reducing turbine torque
Assignee: Kraftwerk Union AG
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Filing: 1972-08-30
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Granted: 1974-09-17
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Expires: 1992-08-30
Abstract
Abstract In the event the load on a generator of a turbo generator is temporarily removed, either partially or completely, the turbine setting or control valves are closed by providing a brief interruption of a power control device until the malfunctioning part of the system is disconnected and power is again called for by the system. This is accomplished by providing control apparatus which is operable in parallel to the power control device and which responds to load jumps exceeding predetermined and adjustable valves to interrupt the power control device and thereby close the turbine setting valves.
Inventors
- 👤 P Schonfeld
- 👤 H Borgmann
- 👤 G Plohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:38
CPC Classifications
F; F01; F01D; F01D21/00; F01D21/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
222 words
Control apparatus for temporarily reducing turbine torque by closing turbine setting valves in the event the load on the turbogenerator is temporarily removed partially or completely, comprising electro-hydraulic control means for controlling said turbine setting valves, said electro-hydraulic control means including a power control device operable to control said turbine setting valves, a first threshold tripping device for determining the lower threshold of the operating range of said power control device, a first input signal means for said control device providing a signal when a load jump exceeds a preset value, a second input signal means for said control device providing a signal at a pre-set value from zero power in the event of complete load removal, said turbine setting valves being closed by disconnecting said power control device when said first input signal means produces its signal or when said second input signal means produces its signal, said first and second input signal means being operable as aforesaid when said first threshold tripping device exceeds the lower threshold of the operating range of said power control device, a third signal producing means producing a signal upon occurrence of a predetermined event, said power control device being operable to open said setting valves only upon the absence of any signal produced by any of said first, second and third signal producing means.
Claim 2
Dependent Claim
222 words
Control apparatus for temporarily reducing turbine torque by closing turbine setting valves in the event the load on the turbogenerator is temporarily removed partially or completely, comprising electro-hydraulic control means for controlling said turbine setting valves, said electro-hydraulic control means including a power control device operable to control said turbine setting valves, a first threshold tripping device for determining the lower threshold of the operating range of said power control device, a first input signal means for said control device providing a signal when a load jump exceeds a preset value, a second input signal means for said control device providing a signal at a pre-set value from zero power in the event of complete load removal, said turbine setting valves being closed by disconnecting said power control device when said first input signal means produces its signal or when said second input signal means produces its signal, said first and second input signal means being operable as aforesaid when said first threshold tripping device exceeds the lower threshold of the operating range of said power control device, a third signal producing means producing a signal upon occurrence of a predetermined event, said power control device being operable to open said setting valves only upon the absence of any signal produced by any of said first, second and third signal producing means.
Claim 3
Dependent Claim
94 words
Apparatus according to claim 1 wherein said first input signal means produces a disconnect signal for said power control device along a first disconnect signal path, said first input signal means comprising a fast-acting servo system held at a predetermined margin relative to the power output, a summing device for said power output and for the servo signal, and a second threshold tripping device, said summing device having an output signal which is positive when a load jump exceeds a pre-set value to thereby provide a disconnect signal via said second threshold tripping device.
Claim 4
Dependent Claim
23 words
Apparatus according to claim 2 wherein said second threshold tripping device is followed by a first storage device for holding said disconnect signal.
Claim 5
Dependent Claim
66 words
Apparatus according to claim 3 wherein said second input signal means comprises means defining a second disconnect-signal path parallel to said first disconnect-signal path, said second path including said first threshold tripping device, an inverter stage, and a delay member, said first threshold tripping device providing a disconnect signal when the power output falls below the level of the operating range of said power control device.
Claim 6
Dependent Claim
43 words
Apparatus according to claim 4 wherein said third signal producing means comprises means defining a third parallel disconnect-signal path having a third threshold tripping device, said latter device responding at a pre-set value from zero power in the event of complete load removal.
Claim 7
Dependent Claim
27 words
Apparatus according to claim 4 comprising an inverting OR gate, the signals of said first and third disconnect signal paths being fed to said inverting OR gate.
Claim 8
Dependent Claim
36 words
Apparatus according to claim 6 comprising a disconnect coil for operating the disconnect of said power control device, said disconnect coil being preceeded by a second storage device for setting manually entered connect and disconnect commands.
Claim 9
Dependent Claim
39 words
Apparatus according to claim 7 comprising an AND gate between said second storage device and said disconnect coil, said AND gate having one signal input from said second storage device and another signal input from said inverting OR gate.
Claim 10
Dependent Claim
25 words
Apparatus according to claim 7 wherein said second storage device has a manual disconnect-signal terminal, said second disconnect signal path being connected to said terminal.
Claim 11
Dependent Claim
72 words
Apparatus according to claim 4 comprising an AND gate in said first disconnect-signal path preceeding said first storage device for clearing the latter, the last said AND gate having at least two signal-carrying inputs, one input being connected via an inverter stage to said second threshold tripping device; the other of said signal-carrying inputs being connected to said first threshold tripping device for setting the operating range of said power control device.
Claim 12
Dependent Claim
37 words
Apparatus according to claim 10 wherein said AND gate has a third input connected to a fourth threshold tripping device, said latter device carrying a signal if the gradient of speed rotation falls below a pre-set value.
Claim 13
Dependent Claim
64 words
Apparatus according to claim 10 wherein said second signal input of said AND gate is connected to an OR gate, said OR gate having two inputs one of which is connected to said first threshold tripping device and the other of which is connected to a time delay means, said latter means being connected to said first disconnect-signal path behind said first storage device.
Claim 14
Dependent Claim
83 words
Apparatus according to claim 1 comprising a magnetic valve for releasing the pressure in a secondary circuit, a load-jump relay for triggering said magnetic valve, an AND gate for suppressing said load-jump relay when said power control device is reconnected, said AND gate having one input from a switch on said power control device and another input from the signal path of said load-jump relay, said AND gate operating a switch in said signal path of said load-jump relay for operating said switch.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |