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

Beta 25 Saildrive Engine (18.5 kW / 25 hp)

Beta 25 marine diesel engine with shallow sump, 18.5 kW / 25 hp @ 3,600 rpm, supplied with a Technodrive SeaProp 60 saildrive or with adaptor kits for existing Volvo 110S/120S/130S, Yanmar SD20 or Bukh saildrives. EPA Tier III compliant.