Governor Basics DKP

8/2/2019 Governor Basics DKP

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GOVERNORS

AND

GOVERNING SYSTEMS



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



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



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.



Principle of Governors



Mechanical Shaft Type Governor



Turbine Governing System



Turbine Control Valve Arrangement



Governor Actuator & Control Valve



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



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



Steady State Regulation

B

A

100 % 0

Percent of Rated Power Output

100

106



Steady State Regulation

B

A

100 % 0

106

100

Percent of Rated Power Output



Impact of Supplemental Regulation



Effects of Regulation



Typical Mechanical Governor



Typical Hydraulic Governor



TG-13 & TG-17 Schemetic Diagram



Electrical Governor



Electro Hydraulic Transducer

Moog Valve



Electro Hudraulic Cutaway



ELETRO HYDRAULIC SERVO VALVE



ELETRO HYDRAULIC SERVO VALVE OPERATION

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Governor Basics DKP