Curtiss-Wright System / Package
Electronic Governor System
Digital governor system with a nuclear-qualified Woodward 505 controller and direct-coupled electro-mechanical actuator, replacing hydraulic steam turbine speed control.
Description
The Electronic Governor System replaces existing hydraulic speed control systems on Curtiss-Wright steam turbines, addressing hydraulic control issues and component obsolescence. It was developed under an agreement with Engine Systems, Incorporated (ESI) and combines a nuclear-qualified Woodward 505 digital controller supplied by ESI, an electro-mechanical direct-coupled actuator, a digital servo drive supplied by Paragon Energy Systems, and speed probes.
Key features
- Magnetic speed pick-up feeds turbine speed to the 505 controller
- 4-20 mA demand signal from the controller to the servo drive
- Actuator mounts directly on the governor valve stem, with internal resolver for position feedback
- Eliminates the EGM, EGR, remote servo and hydraulic subsystem, mechanical linkage, ramp generator signal converter and voltage dropping resistors
- 125 VDC supply, steady-state consumption of 1 A or less
- Operates in mild and hard environmental conditions
Specifications
| Controller | Woodward 505 digital controller (nuclear-qualified) |
|---|---|
| Control signal | 4-20 mA |
| Power supply | 125 VDC |
| Steady-state power consumption | 1 A or less |
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