Archives

Next Generation Electric

Valves and Actuators

Increase Turbine

Reliability and Availability

Heavy Duty Gas Turbines have increasingly been dispatched to support

the grid during renewable energy transition. These market conditions

drive fleet owners to operate their assets as peakers, creating the need

for frequent starts. Start-up reliability has become a key success factor

for these units.

Benefits of Electric

›Elimination of hydraulic fluid and associated problems

with contamination, cold weather and leakage

›Higher reliability design inherent to electric actuation

significantly increase maintenance intervals

› Improved control response and precision

›OEM Qualified and included with the majority of new

Gas Turbines

›Compliant with NERC standards for cold weather

preparedness

›Service Tool provides enhanced diagnostics for plant

personnel and early indication of performance issues

at the DCS operator terminal

Common Problems with Hydraulic Actuators in Heavy Duty Gas Turbines

›Hydraulic fluid viscosity dependent on ambient

temperatures – leads to slower response times in

cold temperatures – resulting in failed starts

›Fluid varnishing can lead to clogged servovalve

passages resulting in failed starts or stops

›Potential of high pressure hydraulic leaks pose safety risks

›Premature seal failure – noise on hydraulic control

circuits can lead to premature wear on hydraulic

and gas seals

›No actuator/valve data to predict failure in advance of outages

›Electric actuators are paired with a remote Digital

Valve Positioner (DVP) that controls the actuator

operation and serves as the customer interface for

power/signal wiring and digital communications.

Multiple DVP’s can be packaged within a stainless

steel cabinet and prewired from the factory to greatly

reduce commissioning time

This proven design has been an industry standard for many years and worldwide

acceptance ensures easy servicing in most engine and governor shops.

The mechanical governor backup capability of Woodward’s EGB governor/actuators

provides increased reliability and safety during the operation of dual-fuel and diesel engines or gas and steam turbines.

Woodward’s PG pressure-compensated governor line effectively controls the speed

of the largest engines and turbines with work capacities ranging from 12 to 500 ft-lb.

Key Product Variants Include

Simple Governor (SG) 5.7 – 40 foot-pounds of work.

Universal Governor (UG-25+) 10.8 – 21.7 foot-pounds of work.

Governor (3161) 18 foot-pounds of work.

Electronically Controlled Actuator w/ Mechanical Backup (EGB) 1-300 foot-pounds of work.

Large Pressure-Compensated (PG) 12-58 foot-pounds of work.

Key Features

Simple to operate and exceptionally reliable.

Precise control of engine speed and output.

For virtually all types of engine applications: power generation, marine, pump, compression and vehicle applications.

Proven, industry-standard design.

Worldwide acceptance and easy service.

Woodward hydraulic-mechanical and electronic governors provide reliable and precise control of engine speed and output in every type of engine application.

Features & Functionality

Hydraulic-mechanical and electronic governors from Woodward ensure exceptionally

reliable and precise control of engine speed and output in virtually every type of engine application.

Woodward governors are used in power generation, marine, pump, compression and vehicle applications, among others.

They are available in work output ratings ranging from 10.8 inch-pounds up to 500 foot-pounds.

Our SG and PSG governors are simple to operate and offer exceptional reliability.

Driven by a suitable SG/PSG/EG drive on the engine, these governors operate using the engine’s own oil supply at minimum pressures of 25 psi.

Woodward’s universal governors (UG) are mechanical-hydraulic governors for controlling diesel,

gas or dual-fuel engines, or steam turbines.

Key Features

Simple to operate and exceptionally reliable.

Precise control of engine speed and output.

For virtually all types of engine applications: power generation, marine, pump, compression and vehicle applications.

Proven, industry-standard design.

Worldwide acceptance and easy service.

• Temperature, oil pressure and fuel level curves can be used directly and users can

define the sensor curves by themselves.

• Multiple crank disconnect conditions (generator frequency, speed sensor, oil

pressure) are optional.

• Event log, real-time clock, scheduled start & stop generator (can be set as start

genset once a day/week/month with or without load).

• Start-up logo and display time are user-defined.

• Can be used on pumping units and as an indicating instrument (indicate and alarm

are enable only, relay is inhibited).

• Maintenance function: Actions (warning or shutdown) can be set when maintenance

time out.

• Instead of conventional analog modulation with a potentiometer, all parameters use

digital adjustment for more reliability and stability.

• Accumulative total run time and total electric energy of A and B. The user can reset

it to 0 and re-accumulate the value, which allows to count the total value.

Functions

• Protection: automatic start/stop of the genset, ATS (Auto Transfer Switch) control

with failure indication and protection function

• All output ports are relay-out

• Parameter settings: parameters can be modified and stored in internal FLASH

memory and cannot be lost even in case of a power outage; most of them can be

adjusted using front panel of the controller and all of them can be modified using

ToolKit-SC on a PC via USB or RS485 ports.

• Temperature, oil pressure and fuel level curves can be used directly and users can

define the sensor curves by themselves.

• Multiple crank disconnect conditions (generator frequency, speed sensor, oil

pressure) are optional.

• Event log, real-time clock, scheduled start & stop generator (can be set as start

genset once a day/week/month with or without load).

• Start-up logo and display time are user-defined.

• Can be used on pumping units and as an indicating instrument (indicate and alarm

are enable only, relay is inhibited).

Key characteristics 2

• Parameter setting: parameters can be modified and stored in internal FLASH

memory and cannot be lost even in case of power outage; most of them can be

adjusted using front panel of the controller and all of them can be modified using

ToolKit-SC configuration software on PC via USB or RS485 port

• More kinds of curves of temperature, oil pressure, fuel level can be used directly and

users can define the sensor curves by themselves

• Multiple crank disconnect conditions (generator frequency, speed sensor, oil

pressure) are optional

• Widely power supply range DC (8 to 35) V, suitable to different start battery voltage

environment

• Event log, real-time clock, scheduled start & stop generator (can be set as start

genset once a day/week/month whether with load or not)

• Logon wallpaper and display time are user-defined

• Can be used on pumping units and as an indicating instrument (indicate and alarm

are enable only, relay is inhibited)

• With maintenance function. Actions (warning or shutdown) can be set when

maintenance time out

• All parameters are digital adjusted (instead of conventional analog modulation with

normal potentiometer) for more reliability and stability

• Waterproof security level IP55 due to rubber seal installed between the controller

enclosure and front panel

• Metal fixing clips enable perfect in high temperature environment