FUNCTIONS OF THE GOVERNING SYSTEM

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FUNCTIONS OF THE GOVERNING SYSTEM

• To contain the speed rise within acceptable
  limits if the unit gets disconnected from load.
• To regulate the steam control valve position and
  hence load generated.
• To control the initial run up and synchronization
  of the machine
• To assist in matching the power generated to that
  demanded by responding to the network frequency
  changes.

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SALENT FEATURES OF 200 MW KWU TURBINE GOVERNING
SYSTEM

• KWU 200 mw turbine is a throttle governed
  machine.
• Two governors, electro-hydraulic and hydraulic
  are incorporated. Both the governors are
  connected in parallel.
• Only one governor can be selected at a time
  through the process of hydraulic minimum
  selection.
• The control valve opening depends on secondary
  oil pressure and there is a definite relationship
  between the opening of HP control valve and IP
  control valve.
• Between 40 to 200 mw the turbine load is varied
  by changing the HP control valve throttling alone.

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HYDRAULIC GOVERNOR SALENT FEATURES

• Hydraulic governor is having only one control
  loop called speed controller.
• HG consists of mechanical arrangement of spring
  and bellow.
• Machine speed is measured and indicated as
  primary oil pressure.
• Range of speed control is 2800-3210 rpm.
• Speed regulation range (droop) of HG is 7 and
  can not be changed while the machine is running.
• HG acts as a back-up to the EHG.
• HG can not be isolated mechanically like EHG and
  HG is considered to be the primary governor of
  the KWU turbine

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ELECTRO-HYDRAULIC GOVERNOR SALENT FEATURES

• EHG consists of three control loops for speed,
  load and pressure.
• EHG optimizes the turbine life by conservative
  operation with the aid of TSE.
• Faster response and precise frequency control.
• Actual speed of the turbine is measured by using
  hall probes
• Range of speed control is wider (0-3210) rpm.
• Speed regulation (Droop) can be changed from 2.5
  to 8 in a step of 0.5 even when the machine
  runs on load.The usual setting of droop in EHG is
  5.
• EHG can be mechanically isolated by closing the
  secondary oil line from the local.

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DIFFERENT OILS USED IN KWU TURBINE

• Control oil (source oil)
• Signal oil (LP bypass operation)
• Auxiliary start-up oil
• Start-up oil
• Auxiliary trip oil
• Trip oil
• Auxiliary secondary oil
• secondary oil
• Test oil
• Primary oil
• Lub oil
• Jacking oil

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GOVERNING SYSTEM DEVICES

• Remote trip solenoids
• Turbine trip gear (Main trip valve)
• Starting and load limiting device
• Speeder gear
• Auxiliary follow-up piston
• Follow-up piston
• Hydraulic amplifier
• Electro-hydraulic convertor
• Sequence trimming device
• Solenoid for load sheeding relay
• Extaction valve relay

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REMOTE TRIP SOLENOIDS
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TURBINE TRIP GEAR
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AUXILIARY TRIP FLUID
DRAIN
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DRAIN
TRIP OIL
CONTROL OIL
AUXILIARY TRIP OIL
AUXILIARY TRIP OIL
AUXILIARY START-UP OIL
MAIN TRIP VALVE
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