System and method for operating a steam turbine with improved organization of logic and other functions in a sampled data control
US3934128A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 1973 |
| Grant date | Jan 20, 1976 |
| Priority date | — |
| Expiry date | Oct 16, 1993 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01D17/24
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The throttle and governor valves of a steam turbine are operated by a digital computer control system to provide speed and load control for the turbine. The computer includes a speed and load control which periodically generates control outputs and a separate logic control which responds to panel and contact inputs to generate logicals which structure the speed and load control. An analog scan periodically enters feedback parameters into the computer for use by the controls. An input contacts scan enters feedback logicals into the computer on demand, or under certain conditions periodically. A monitor operates with an auxiliary synchronizer to control the execution of the scans and the controls. The speed and load controls are bid for execution once each second to generate the control outputs which are applied to an external electrohydraulic control for the valves. The analog scan is bid for execution once each half second and the logic control is bid for execution on demand for performance of a logic function. The auxiliary synchronizer is bid for execution once each tenth of a second. The monitor controls the execution with a priority order of auxiliary synchronizer, speed and lo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.