Governing System and Protection System

Types: full hydraulic governing system and digital electric hydraulic control system (DEH).

1、 Full Hydraulic Governing System

①Mainly composed of measurement element, magnifying mechanism, actuating mechanism, reference device, feedback mechanism.

② Low price

③ Mainly applied in constant speed and power steam turbine generator unit without carrying load setup.

④ The diversity factor is fixed, which is decided by the experimental data.

⑤ Pure manual intervention adjusting mode, and not only the speed raising, but also the on-load and load increase or decrease are all need to be adjusted gradually by hand.

⑥ Regulate only one parameter at a time. The controllability as well as the control function couldn't meet the needs of coordination control of the units and automatic generate electricity control of the power grid. In addition, the governing system has such weaknesses as easy to jamming, high delay rate, poor regulation quality, and the valves can not be governed.

2、Digital Electric Hydraulic Governing System (DEH)

① Mainly composed of digital controller, electric fluid server device, hydraulic actuator, etc.

② Solved the problems that the function of the full hydraulic governing system is limited by component number, machining accuracy, adjustment level, etc., and it is more reliable. Greatly enriched the functions and improved the performance of the governing system.

③ Realized electric function, closed-loop control to extraction pressure, thermoelectric involvement adjustment and priority control.

④ DEH has ports for automatic systems, such as the Coordinated Control System (CCS), Automatic Generation Control (AGC), Run Back (RB), Management Information System (MIS), etc. DEH also has the functions of monitoring operational data, protecting the generating unit when the data is abnormal and the power is unbalanced.

Protection System＞＞

Over-speed security system, axial displacement security system, and emergency trip security system.

Full hydraulic governing system possesses all the above three basic security systems.

As the development trend of modern governing technology, more and more users choose electric-hydraulic governing system. The corresponding protection signal unit is added in various digital controllers, which can capture all signals from site and perform the relevant task according to the signal.

The more comprehensive supervisor & security system specially the Turbine Supervisory Instrumentation (TSI) and Emergency Trip System (ETS) are added in the security system. They can monitor the running turbine directly. The independent digital controller and Distributed Control System (DCS) make double security come true.