what is the function of servo governor in turbine?

Question

servo governor plays a role in controlling turbine and regarding

Answer 1

*A hydraulic turbine is required to run at the same constant speed as that of the electric generator to which it is directly coupled . This synchrous speed must be maintained for all conditioned of load on the generator.But since the demand for the power fluctuates with time, the hydro unit must adjust to itself to such variations in load in such a way that the turbine speed remains constant/unaffected.whenever the load on the turbine decrease ,if the discharge entering the turbine is not adjusted accordingly,its speed will increases.On the other hand ,increase in load will tend to reduce the turbine speed unlesss the turbine discharge is increased in accordance with the new load. S uch regulation of discharge with a view to maintain a synchrous speed of the turbine runner is called governing of turbine. and is done automatically by means of a governer.
centrifugal governers are usually used with modern hydraulic turbines and have the following parts:
1.pendulum/actuator - belt/gear driven by the turbine main shaft.
2.Servomotor.
3.relay valve/control valve.
4.oil pump.-for supplying oil to control valve / servomotor.


*you must visit following:
http://www.mathworks.com/access/helpdesk/help/toolbox/physmod/powersys/index.html?/access/helpdesk/help/toolbox/physmod/powersys/ref/steamturbineandgovernor.html&http://search.yahoo.com/search?ei=utf-8&fr=slv8-msgr&p=servo%20governor-turbine

Answer 2

Governor Of Turbine

Answer 3

Any governor regulates fuel flow, engine/turbine speed, and load management. A servo is an electro-mechnical "motor" that varies a mechnical span ouput as the electrical input varies.

A servo governor therefore controls fuel flow to the turbine based on an electrical command to drive a mechnical fuel regulator valve.

Answer 4

We will need to first discuss "Governor" and then "Servo"
Governor:
A device that automatically maintains the rotary speed of an engine within reasonably close limits regardless of the load. A typical governor regulates an engine's speed by varying the rate at which fuel or working fluid is furnished to it. Nearly all governors work by centrifugal force and consist of a pair of masses rotating about a spindle driven by the engine and kept from flying outward, usually by springs. With an increase in speed, the controlling force of the springs is overcome and the masses move outward, opening valves supplying the engine with its working fluid or fuel. James Watt invented a governor for controlling steam engines. Modern governors are used to regulate the flow of gasoline to internal-combustion engines and the flow of steam, water, or gas to various types of turbines.
Servo:
A system for the automatic control of motion by means of feedback. The term servomechanism, or servo for short, is sometimes used interchangeably with feedback control system (servosystem). In a narrower sense, servomechanism refers to the feedback control of a single variable (feedback loop or servo loop).
Thus a servo governor automatically controls the speed of a turbine by controlling the input. This could be
steam
fuel
water