4.2 MODELLING OF TURBINE SPEED-GOVERNOR CONTROLLER
Fig. 4.2 is the schematic representation of a turbine speed governing system. It has four major components.
Speed governor: The Speed governor senses the change in speed (or frequency) and hence it can be regarded as heart of the system. The standard model of a speed governor operates by the fly-ball mechanism. Fly-balls moves outward when speed increases and the point Q on the linkage mechanism moves downwards, the reverse happens when the speed decreases. The movement of point Q is proportional to the change in shaft speed.
Linkage mechanism: PQR is a rigid link pivoted at Q and RST is another rigid link pivoted at S. This link mechanism provides a movement to the control valve in proportion ...
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