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Steam Turbine Governing System. Prepared by: Nimesh Gajjar. DEFINITION OF GOVERNING “A SYSTEM WHOSE PURPOSE IS TO CONTROL A PRIME MOVER ” OR GOVERNOR IS A DEVICE TO CONTROL SPEED /LOAD TO A SET POINT. Why Governing is required?.

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steam turbine governing system

Steam Turbine Governing System

Prepared by: Nimesh Gajjar

slide2

DEFINITION OF GOVERNING

“A SYSTEM WHOSE PURPOSE IS TO CONTROL A PRIME MOVER”

OR

GOVERNOR IS A DEVICE TO CONTROL SPEED /LOAD TO A SET POINT.

why governing is required
Why Governing is required?
  • The characteristics of an ungoverned turbine is unsuitable for electric power generation. The figure shows the characteristics of an ungoverned and a speed governed turbine.
  • The turbine output is controlled by varying the steam flow by means of throttling valves of the turbine .The valves are controlled by the governor.
  • Governing system is required to ensure that the system demand is followed automatically without large deviation in the nominal electric frequency
slide4

The main purpose of the Governing System is to maintain:

*Constant speed at variable loads.

* Constant speed at varying steam inlet parameters.

*Constant speed at varying extractions and exhaust

steam parameters/conditions.

principle methods of load reduction
Principle methods of load reduction
  • Throttle governing
  • Nozzle control governing
  • Bypass governing
  • Combination of the above
slide9

SPEEDER SPRING

FLY WEIGHTS

SPOOL

ROTATING SLEEVE

SHAFT DRIVEN BY TURBINE SHAFT

  • Types of Governors
  • Mechanical Governors(CENTRIFUGAL FLYWEIGHT )

Steam Turbine\Governing\Steam-Turbine-Training.swf

slide11

CENTRIFUGAL GOVERNOR

LINKAGE

]

[

SERVOMOTOR

OIL PUMP

D

B

PILOT VALVE

THROTTLE VALVE

P0

C

P1

A

]

]

S

[

[

GEAR

STEAM

EXHAUST TO CONDENSER

  • HYDRO- MECHANICAL GOVERNOR
slide14

By pass Governing

To produce more power ( when on over load) additional steam may be admitted a by-pass valve to the later stage of the turbine.

hunting
Hunting

Suppose, if the load on a turbine is suddenly reduced, the machine begins to speed up. When the speed reaches a certain value, the governor comes into operation and due to this the steam supply is considerably reduced with the result that the speed drops well below the normal value. Again the governor acts after a period of time, which depends on a number of circumstances such as friction, sensitiveness etc. and the steam supply is suddenly augmented. Again the speed rapidly rises and the cycle begins a new.

Fluctuating loads or a sudden change of load especially in case of reduction of load, are more likely to produce hunting, but in other cases it will persist even at fairly steady loads.