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Turbine governor

The turbine governor is the essential part of the hydraulic power unit for efficient conversion of hydraulic energy to electric energy.

Hydraulic power unit (HPU)

ANDRITZ HYDRO offers complete oil hydraulic power unit (HPU) packages including sump tank, pumps, control and main relay valves, filters, monitoring devices, and pressure accumulators. The standard concept has a modular design with use of reliable industrial components and design pressure up to 250 bar.

Preferably we use self-regulating axial piston pumps for the main oil supply, but constant pumps (e.g. screw or gear type) with special pump control blocks can also be used.

Special hydraulic features needed for the turbine control - like pump control blocks, failsafe function on main relay valves, special shape of control edges on main relay valves, etc. - have been developed in order to guarantee maximum reliability and safety.

A series of standard, but tailor-made main relay valves are available for special applications on old low-pressure systems as well as on new turbines requiring high operating capacity.

The hydraulic system is designed together with the actuating elements, both for new plants and rehabilitation projects.

Digital turbine governor

ANDRITZ HYDRO turbine governors stand for flexible and reliable turbine control. The new challenges on grid stability are faced by means of the load frequency algorithm. The high number of communication interfaces distinguishes the digital turbine governor TC1703 and TC1703XL, which makes operation and remote assistance easy to implement. Due to the various input and output modules, a wide range of sensors and actuators can be used together with the turbine governor, even when existing hydraulic components must be taken into account.

The digital turbine governor gets by with the functional requirements of the client because of a scalable and modular solution. It can be implemented as stand-alone solution or as integrated part of the existing structure. Preceding simulations and stability studies ensure stable and reliable control.

The governor performs different tasks during operation. Beginning with the start of the turbine on demand and stabilizing the speed for synchronization, it ensures stable load control when the unit is connected to the grid. Further tasks are supporting the grid frequency during primary control and fast reaction on load rejection and island detection. Due to the various requirements of the different operation modes, bump-less switching is vital for the turbine governor in order to provide safe and preserving operation.


A variety of special functions are available related to the
turbine type, e.g.

  • Flow calculation
  • Adaptive CAM optimization for Kaplan turbines
  • Surge control
  • Flush control for Kaplan turbines

Comprehensive operation with a high-resolution touch panel gives the operator the opportunity to interact with the turbine controller and to view all the status information on a central device. In addition, it allows local operation of the turbine within the defined limits.

Comprehensive services, spare part guarantees, and training classes complete our scope of delivery.

Hydraulic power unit

Hydraulic power unit



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