Hydraulic actuators

Monitor forces for key actuators

Purpose

  • Monitor hydraulic actuator performance and damage / wear for turbine guide vane (Francis / Kaplan) regulation that achieves load set-point agility and precision for all production states. 
  • Monitor hydraulic actuator performance and damage / wear for turbine runner vane (Kaplan) regulation that achieves load set-point agility and precision for all production states. 
  • Monitor hydraulic actuator performance and damage / wear for turbine nozzle (Pelton) regulation that achieves load set-point agility and precision for all production states.  
  • Monitor hydraulic actuator damage / wear for main inlet valve for unit functionality start and stop.  
  • Monitor hydraulic actuator damage / wear for gates/valves for dams and water ways that have important functionality for plant operation, safety, and concessions. 
  • Monitor performance and damage / wear for other important hydraulic actuators in your power plant.  

  Reduce downtime caused by damage and corrective maintenance. Improve ability to do preventive maintenance. 

Signals / measurements

Inputs

Quality

How​

Position of actuator piston rod  

Pressure piston side A 

Pressure piston side B

(Angular rotation for x guide vanes) 

(Set point for turbine regulator) 

(Droop setting) 

Results

Results

Plot 1: Force – position plot for extension 

Plot 2: Force – position plot for retracting 

Technical summary

In general, actuator data like the hydraulic (wetted) areas of each side of the piston to calculate forces will have to be provided.  

Turbine regulation performance is expected to be a key indicator of the capability to deliver power system services in different types of “frequency markets”. 

Adding a few direct measurements (4?) of guide vane angular rotation gives a clearer picture when it comes to turbine guide vane regulation system performance  

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