Transcription of CHAPTER-6 governing system - IIT Roorkee
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CHAPTER-6 governing system - IIT Roorkee
147 CHAPTER-6 HYDRO-TURBINE governing system (Reviewed by Dr. R. Thapar) Introduction governing system or governor is the main controller of the hydraulic turbine. The governor varies the water flow through the turbine to control its speed or power output. Generating units speed and system frequency may be adjusted by the governor. governing system as per IEEE std. -75 includes following. a) Speed sensing elements b) Governor control actuators c) Hydraulic pressure supply system d) Turbine control servomotors-these are normally supplied as part of turbine TO (SPEED SIGNALGENERATOR)TURBINEFLOWCONTROLW ICKETGATES ORNEEDLEHYDRAULICAMPLIFIERSERVOMOTORPILO TSERVOMOTOROR HYDRAULICTRANSDUCERCONTROLSPEEDSENSINGSP EED(FREQUENCY)SIGNAL FROM PT(SHP ONLY)GOVERNORLEVEL,OTHERSUPERVISORYCONTR OLSET POINTS ADJUSTMNETS(DROOP;JOINT CONTROL)TECHOMETERSPEEDSW ITCHESFEED BACK Figure : governing system Block Diagram (Typical) The primary functions of the hydraulic turbine governor are as follows: i) To start, maintain and adjust unit speed for synchronizing with the runni
devices such as control motors, solenoids, and position switches. Digital controls can be designed in any configuration because software changes or additions can be made easily without requiring additional hardware. A typical digital governor specified for a Kaplan turbine with control of wicket gates and blades is shown in figure 6.4(a).
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