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Technical Review

Research and

Development

Technology of BusinessSegments

DEH Governor

Mitsubishi Heavy Industries, Ltd. (MHI) has been dedicated to develop, design, manufacture DEH

system focusing on system reliability for stable steam turbine generator operation for years. The DEH

governor system is one of the families of our original Distributed control system (DCS) named DIASYS.

DIASYS (Product page)

MHI has supplied more than 1,500 systems throughout the world, ranging from a minimal configuration

consisting of only smallest turbine governor system to control systems for Boiler - Turbine - Generator

(BTG) plants, including 1,000 megawatt class supercritical boilers and Combined cycle plants

consisting of gas turbines and steam turbines. As a plant manufacturer, MHI has also provided optimal

applications, such as automated systems that permit a small number of people to operate a plant,

high-efficiency operation control applications, and operator assistance systems. The DEH Governor

has been successfully applied not only to new power plant but also to the replacement of existing

power plant. The governor system is simplified by the application of DEH governor. The conventional

hydraulic governor consists of many components such as cup valve, bellows, springs and etc. which

make the system be complicated and increase the possibility of trouble occurrence, while the DEH

governor consists of less components compared with the conventional hydraulic governor. Furthermore

the DEH governor does not require skilled personnel in its maintenance. The application of DEH

governor system promises much higher reliability of the turbine control as well as easy operation and

maintenance.

Modification of Conventional Hydraulic Governor

Comparison Between DEH Governor and Conventional Hydraulic Governor

1. DEH governor developed by MHI has been supplied not only to newly constructed steam turbine

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control system but also to the modification of existing mechanical hydraulic governor.

2. Application of DEH governor contributes

Improved controllability,

Reliable protection function,

Easy operation,

Easy maintenance.

3. DEH governor can also be applied to Non-OEM 150 psig or 300 psig hydraulic control system

4. Boiler and plant control can be incorporated within the same system and plant automatic control

can be achieved.

5. DIASYS Netmation covers from standalone DEH system up to total Distributed Information and

Control System. DIASYS Netmation retains following features.

High reliability based on an extensive record of achievement

Advanced control functionality for every kind of control

Human engineering-based superior operability

Easy maintenance

Flexibility and expandability to suit any kind of plant

Modification of Conventional Hydraulic Governor

Comparison Between DEH Governor and Conventional Hydraulic Governor

Steam Turbine Governor

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DEH Governor | Mitsubishi Heavy Industries, Ltd. http://www.mhi.co.jp/en/technology/business/power/service/steam/governor/deh_governor.html

2 of 2 2012/12/31 09:59 .