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8/2/2019 Governor Basics DKP
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GOVERNORS
AND
GOVERNING SYSTEMS
8/2/2019 Governor Basics DKP
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SESSION – I :
– WHAT IS GOVERNING?
– BASICS OF GOVERNING DEEPAK PURI
– VARIOUS TYPES OF GOVERNORS
SESSION – II :
STEAM TURBINE GOVERNING SYSTEMS UK UPADHYAY
SESSION – III :
ELECTRONIC GOVERNORS MS MANI
SESSION – IV :
WOOD WARD TG-13 GOVERNORS FOR DEEPAK PURI
DRIVE TURBINES
SESSION – V:
VALIDATION
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0
5
10
Nos.
Trips with Prod Loss 10 2 3
Trips due to low lube oil
pressure
6 1 2
2001 2002 2003
TRIPPINGS OF COMPRESSORS CAUSING PRODUCTION LOSS
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Why Governing ??
VISUALISE SITUATIONS:
• When load increases / decreases for the turbo-generation
• When extraction flow increases / decreases
• When inlet steam conditions like pressures & temperatures change
• When exhaust conditions like pressures and temperatures change
• When the load gets reduced / thrown off for a turbo-driven pump
• When the load is to be increased / decreased on a turbo-driven compressor.
INFERENCE:
All the situations and many more not covered above would result in change ofspeed.
This change of speed could be
• Undesirable : hence needs to restored back.
• desirable : hence needs to be affected.
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Principle of Governors
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Mechanical Shaft Type Governor
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Turbine Governing System
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Turbine Control Valve Arrangement
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Governor Actuator & Control Valve
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SPEED DROOP
CHANGE IN THE STEADY STATE GOVERNOR SPEED EXPRESSED IN
PERSENTAGE OF RATED SPEED CORRESPONDING TO GOVERNOR OUTPUT
POSITION FROM RATED POWER OUTPUT (FULL LOAD) TO ZERO POWER
(NO LOAD) POSITION
Ngo – Ngr
DROOP (%) = -------------- X 100Ngr
Ngo: Speed of governor when governor output is at position
corresponding to no load
Ngr: Speed of governor when governor output is at position
corresponding to rated load
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REGULATION
IT IS THE CHANGE IN STEADY STATE SPEED OF TURBINE, EXPRESSED IN
PERCENTAGE OF RATED SPEED CORRESPONDING TO THE POWER OUTPUT
CHANGE FROM RATED POWER OUTPUT TO ZERO POWER OUTPUT
No – NrRs (%) = -------- X 100
No
No: Speed at zero output
Nr: Rated speed
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Steady State Regulation
B
A
100 % 0
Percent of Rated Power Output
100
106
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Steady State Regulation
B
A
100 % 0
106
100
Percent of Rated Power Output
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Impact of Supplemental Regulation
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Effects of Regulation
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Typical Mechanical Governor
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Typical Hydraulic Governor
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TG-13 & TG-17 Schemetic Diagram
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Electrical Governor
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Electro Hydraulic Transducer
Moog Valve
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Electro Hudraulic Cutaway
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ELETRO HYDRAULIC SERVO VALVE
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ELETRO HYDRAULIC SERVO VALVE OPERATION
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