KWU GOVERNING SYSTEMKWU GOVERNING SYSTEM

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BASICS OF GOVERNING SYSTEMBASICS OF GOVERNING SYSTEMDRAWINGS ARE NOT AS PER DRAWINGS ARE NOT AS PER ACTUALACTUALTHIS PRESENTATION HAS BEEN THIS PRESENTATION HAS BEEN PREPARED PREPARED JUST FOR UNDERSTANDING THE JUST FOR UNDERSTANDING THE SYSTEMSYSTEM

BOILER

Condenser

LP TURBINEIP TURBINEHP TURBINE

MS

MS

CRH NRV

HRH

HPSV

HPSV

IPSV

IPSV GENERATOR

HPCV

HPCV

IPCV

IPCV

CRH NRV

TG SETTG SET

Generating Station Load

Consumer

Turbine

100MW

120MW 2900 rpm

100MW3000rpm

120MW

3100 3000 2900 28503150

Generator Speed

Turbine/Unit Lock-Out Tripping

1500 180

Steam from boiler

Steam to turbine

Opening SV

Opening CV

Turbine Rolling

Synchronization

De-acceleration

Acceleration

Tripping

120MW 3000rpm

80MW

80MW 3100rpm

80MW3000RPM

GENERAL SCHEME

LEGENDSLEGENDS

S.NoS.No Name of OilName of Oil Source & pressureSource & pressure PurposePurpose Colour CodeColour Code

1.1. Control OilControl Oil MOP/AOP ( 7-8.5 Kg/cmMOP/AOP ( 7-8.5 Kg/cm22)) To establish Trip Oil, Aux Trip Oil, Trip To establish Trip Oil, Aux Trip Oil, Trip Oil, Start-up Oil, Aux Start-up Oil, Aux Oil, Start-up Oil, Aux Start-up Oil, Aux

Secondary Oil, Secondary Oil, Primary Oil, Secondary Oil, Secondary Oil, Primary Oil, EtcEtc

2.2.Trip OilTrip Oil

Main Trip Valve (4.8-6 Kg/cmMain Trip Valve (4.8-6 Kg/cm22)) To reset , Open & Trip stop valveTo reset , Open & Trip stop valve

3.3.Aux Trip OilAux Trip Oil Main Trip Valve (4.8-6 Kg/cmMain Trip Valve (4.8-6 Kg/cm22)) To trip Hydraulic Trip DeviceTo trip Hydraulic Trip Device

4.4.Start-up OilStart-up Oil

Starting Device ( 5.5 Kg/cmStarting Device ( 5.5 Kg/cm22)) To assist Resetting & Opening Stop ValvesTo assist Resetting & Opening Stop Valves

5.5.Aux Start-up OilAux Start-up Oil

Starting Device ( 5.5 Kg/cmStarting Device ( 5.5 Kg/cm22)) To Reset Main Trip Valve & Hydraulic Trip To Reset Main Trip Valve & Hydraulic Trip DeviceDevice

6.6.Aux Secondary OilAux Secondary Oil

Speeder Gear ( 2.3-4.8 Kg/cmSpeeder Gear ( 2.3-4.8 Kg/cm22)) Input Signal to Hydraulic ConverterInput Signal to Hydraulic Converter

7.7. Secondary Oil Secondary Oil (HP/IP) (HP/IP)

Hyd/Electro-Hyd Converter ( 0-6 Kg/cmHyd/Electro-Hyd Converter ( 0-6 Kg/cm22)) To govern HP/IP Control Valve openingTo govern HP/IP Control Valve opening

8.8.Primary OilPrimary Oil Primary Oil Pump ( 0-2.3 Kg/cmPrimary Oil Pump ( 0-2.3 Kg/cm22)) Feedback speed signal for HG Feedback speed signal for HG

9.9.Test OilTest Oil Over Speed Test Device ( 2.0 Kg/cmOver Speed Test Device ( 2.0 Kg/cm22)) To test Over Speed Test DeviceTo test Over Speed Test Device

10.10. DrainsDrains

Different oils, their colour codes, sources and purpose in KWU Governing System

CONTROL OIL OIL TAKEN FROM AOP/MOP DISCHARGE HEADER FOR THE GOVERNING SYSTEM

TRIP/AUX TRIP OILTHESE TWO OIL CIRCUITS ARE ESTABLISHED THROUGH MAIN TRIP VALVES UNDER RESET CONDITION.

START-UP/AUX START-UP OIL THESE TWO OIL CIRCUITS ARE ESTABLISHED TO ITS PEAK PRESSURE THROUGH STARTING DEVICE AT 0% POSITION AND PRESSURE STARTS REDUCING WHEN POSITION OF THE STARTING DEVICE IS RAISED.

AUX SECONDARY OIL THIS OIL CIRCUIT IS NOTHING BUT OUTPUT OF HYDRAULIC GOVERNOR AND INPUT TO HYDRAULIC CONVERTER.

SECONDARY OIL OUTPUT OF HYDRAULIC/ELECTRO-HYDRAULIC CONVERTER.

TEST OILTHIS OIL CIRCUIT IS ESTABLISHED TO TEST OVER SPEED TRIP DEVICE WHEN TURBINE IS RUNNING AT RATED SPEED.

REMOTE TRIP SOLENOID VALVESTHESE ARE TWO IN Nos. AND WHEN ANY TURBINE TRIP GETS INITIATED, THE SOLENOIDS GETS ENERGISED AND CONTROL OIL GETS DRAINED THROUGH THE VALVES AND TRIPS THE MTV.

MAIN TRIP VALVESTHESE ARE TWO IN Nos. AND CALLED THE MAIN TRIP GEAR. ALL THE TURBINE TRIPPINGS TAKE PLACE THROUGH THIS DEVICE. UNDER NON-TRIP CONDITION ESTABLISHES TRIP & AUX TRIP OIL AND USED FOR RESETTING/OPENING THE STOP VALVES AND PRODUCING HP/IP SECONDARY OIL.

STARTING DEVICE AS THE NAME OF THIS DEVICE SUGGESTS, THIS DEVICE IS USED FOR RESETTING AND OPENING THE STOP VALVES AND , MAIN TRIP VALVES & HYDRAULIC TRIP DEVICES. THIS DEVICE EITHER BE OPERATED MANUALLY BY HAND WHEEL OR FROM REMOTE (MCR) THROUGH MOTORISED ACTUATOR.

SPEEDER GEAR THIS DEVICE IN COMBINATION WITH STARTING DEVICE FORMS HYDRAULIC GOVERNOR AND PROVIDES INPUT HYDRALIC SIGNAL TO HYDRAULIC CONVERTER. THIS DEVICE EITHER BE OPERATED MANUALLY BY HAND WHEEL OR FROM REMOTE (MCR) THROUGH MOTORISED ACTUATOR.

HYDRAULIC/ELECTRO-HYDRAULIC CONVERTERAMPLIFIES&CONVERTS HYDRAULIC /ELECTRICAL SIGNALS TO HYDRAULIC SIGNALS ( HP/IP SECONDARY OIL) FOR THE OPERATION OF HP/IP CONTROL VALVE.

HYDRAULIC TRIP DEVICESTHESE DEVICES PROVIDE MANDATORY PROTECTIONS OF THE TURBINE BY DRAINING AUX TRIP OIL. THESE DEVICES ARE RESET BY AUX START-UP OIL.

AOP

MOP

AOP Discharge header

Filtered Control Oil

Remote Trip Solenoid

Valves

Main Trip Valves

Hyd. Trip Device

TEST V/V STOP V/VSERVO MOTOR

STOP & CONTROL

VALVE

CONTROL VALVE SERVO MOTOR

Hyd

C

onverter

Electro-H

yd

Con

verter

Starting Device

Secondary Oil

Tri

p O

il

Aux Start-up Oil

Start-up Oil

Au

x T

rip

O

il

Filtered Controlled Oil

Filter

BLOCK DIAGRAM OF BLOCK DIAGRAM OF GOVERNING SYSTEMGOVERNING SYSTEM

TO TEST V/V OF STOP V/V

TO MTV & HTD V/V

CONTROL OIL FROM AOP/MOP

STARTING DEVICE

STARTING DEVICE

BRINGING THE STARTING DEVICE TO “0” POSITION TO BUILD START-UP & AUX STATR-UP OIL TO RESET STOP& MAIN TRIP

VALVES AND HYD. TRIP DEVICE

Aux Start-up Oil (5.5 Kg/cm2)

Start-up Oil (5.5 Kg/cm2)

RAISING STARTING DEVICE POSITION TO DE-PRESSURISE START-UP & AUX STATR-UP OIL TO OPEN STOP VALVES AND

PRODUCING AUX SECONDARY OIL

75 100

25

50

0

Starting Device

In %

Position at MCR

Drain

Drain

Hand Wheel

Motor

Start-up Oil (0 Kg/cm2)

Aux Start-up Oil (0 Kg/cm2)

STARTING DEVICESTARTING DEVICE

CONTROL OIL FROM AOP/MOP(6-8.5 Kg/cm2)

AUX TRIP OIL TO HYDRAULIC TRIP DEVICES (4.8-6.0 Kg/cm2)

TRIP OIL TO RESET/OPEN STOP VALVE & FOLLOW-UP VALVES ETC TO PRODUCE

SECONDARY OIL (4.8-6.0 Kg/cm2)

RESETTING OF MTV FOR ESTABLISHING TRIP/AUX

TRIP OIL

TRIPPING OF MTV FOR KILLING TRIP OIL

AUX START-UP OIL FROM STARTING DEVICE (“0” POSITION)

DRAIN

TRIP OIL TO RESET/OPEN STOP VALVE & FOLLOW-UP VALVES ETC TO PRODUCE

SECONDARY OIL (0 Kg/cm2)

AUX TRIP OIL TO HYDRAULIC TRIP DEVICES (0 Kg/cm2)

MAIN TRIP VALVE

REMOTE TRIP SOLENOID OPERATED VALVES

TRIP OIL TO HOLD STOP V/V’S & AND TO PRODUCE

SECONDARY OIL

AUX TRIP OIL TO HYDRAULIC TRIPING DEVICES

CONTROL OIL FROM AOP/MOP

AUX START-UP OIL TO RESET

MTV & HTD

FilterDRAIN

AOP Disharge

header

AOP/ MOP

RESETTING OF MTVRESETTING OF MTV

REMOTE TRIP SOLENOID OPERATED VALVES

TRIP OIL TO HOLD STOP V/V’S & AND TO PRODUCE

SECONDARY OIL

AUX TRIP OIL TO HYDRAULIC TRIPING DEVICES

TRIPPING OF MTV THROUGH RTSV (ELECTRICAL)

CONTROL OIL FROM AOP/MOP

AUX START-UP OIL TO RESET

MTV

FilterDRAIN

TRIPPING THROUGH TRIPPING THROUGH RTSVRTSV

AUX TRIP OIL TO THE HYDRAULIC TRIPING

DEVICES

AUX START-UP OIL TO RESET

MTV

HYDRAULIC TRIP DEVICE

REMOTE TRIP SOLENOID OPERATED VALVES

TRIP OIL TO HOLD STOP V/V’S & AND TO PRODUCE

SECONDARY OIL

AUX TRIP OIL TO HYDRAULIC TRIPING DEVICES

TRIPPING OF MTV THROUGH HYDRAULIC TRIP DEVICE

(MECHANICAL)

CONTROL OIL FROM AOP/MOP

FilterDRAIN

AUX START-UP OIL TO RESET HYD TRIP DEVICES

TRIPPING THROUGH HYD TRIPPING THROUGH HYD TRIPDEVICETRIPDEVICE

AUX TRIP OIL TO THE HYDRAULIC TRIPING

DEVICES

AUX START-UP OIL TO RESET

MTV

HYDRAULIC TRIP DEVICE

REMOTE TRIP SOLENOID OPERATED VALVES

TRIP OIL TO HOLD STOP V/V’S & AND TO PRODUCE

SECONDARY OIL

AUX START-UP OIL TO RESET HYDRAULIC

TRIP DEVICES

RESETTING OF RTSV, HYD. TRIP DEVICES & MTV THROUGH

CONTROL OIL FROM AOP/MOP

FilterDRAIN

RESETTING OF RTSV, HYD. TRIP DEVICES & MTV THROUGH

RESETTING OF RTSV(DE-ENERGIZING) & HYD. TRIP DEVICES & MTV THROUGH

STARTING DEVICE AT “0” POSITION

FilterDRAIN

STOP VALVE

OPENING OF STOP VALVES BY RAISING STARTING DEVICE

START-UP OIL TO TEST V/V

TRIP OIL TO STOP V/V

STOP VALVE SERVO-MOTOR

HYD TRIP DEVICE

DRAIN

AUX TRIP OIL TO HYD TRIP DEVICE

AUX TRIP OIL TO HYD TRIP DEVICE

AUX START-UP OIL TO HYD TRIP DEVICE

AU

X S

TA

RT

-UP

O

IL T

O M

TV

MTV

S/D

RTSV’S

TEST VALVE

STOP V/V OPERATIONSTOP V/V OPERATION

STOP VALVE SERVO-MOTOR

SPRING

CYLINDER

SPRING DISC

PISTON

PISTON DISC

TRIP OIL ABOVE PISTON

TRIP OIL BELOW PISTON DISC

RESETTING OPENING

TRIPPING

Drain

RESETTING/OPENING/TRIPPING RESETTING/OPENING/TRIPPING OF STOP VALVEOF STOP VALVE

TURBINE OVERSPEED TRIP DEVICE

FLY BOTL

Aux Trip Oil

AUX START-UP OIL TO RESET

AUX TRIP OIL

Drain

TURBINE OVERSPEED TRIP DEVICE

TURBINE SHAFT

AUX START-UP OIL TO RESET

AUX TRIP OIL

DrainTRIPPING OF Thrust Bearing TRIP DEVICE

RESETTING OF Thrust Bearing TRIP DEVICETEST OIL

THRUST BEARING TRIP DEVICE

Drain

Control Oil

Atmosphere

Vacuum

Aux Trip Oil

Drain

LOW VACUUM TRIP DEVICE

Resetting Of Low Vacuum Trip Device

Tripping Of Low Vacuum Trip Device

Low Vacuum Trip Device

75 100

25

50

0

Starting Device

In %

75 100

25

50

0

Speeder Gear

In %

Starting Device Speeder GearPrimary Oil

Pump

Primary Oil (0-2.3Kg/cm2)

Trip Oil From MTV

Aux Follow-up Valve

Link

Control Oil

Aux Secondary Oil To Hyd. Governor

Speeder Gear

Aux Follow-up Piston

Starting Device

HYDRAULIC GOVERNOR

Primary Oil

Trip oil From MTV

Aux Secondary Oil To Hyd. Governor

Speeder Gear

Aux Follow-up Piston

Primary Oil Pump

Starting Device

Start-up oil

Aux Start-up oil

Control oil

75 100

25

50

0

Starting Device

In %

75 100

25

50

0

Starting Device

In %LINK

HP Sec. Oil

IP Sec. Oil

Follow - up valves

Hydraulic ConverterAux Sec Oil

from S/G

Trip Oil From MTV

Trip Oil From MTV

Electro-Hydraulic Converter Follow - up valves

Amplifier Piston

Amplifier Piston

0-10V Supply from ATRS

Control Oil

Control Oil

Trim Device

Trim Device

HP Sec. Oil

IP Sec. OilHG & EHG

HG/EHG

INPUT

DRAIN-1 DRAIN-2OUTPUT

HYDRAULIC MINIMUM SELECTION

ORIFICE

GOVERNER OUTPUT “0%” DRAIN 100% OPEN OR 0% CLOSE

GOVERNER OUTPUT “100%” DRAIN 0%

OPEN OR 100% CLOSE

HYDRAULIC GOVERNOR

ELECTRO-HYD GOVERNOR

HYD MINM SELECTION

Secondary Oil

Drain

Drain

Drain ‘d’ Spring side

‘e’ Valve side

‘e’ Valve side

Control Oil

Pilot Valve of HPCVWhat happens when

secondary oil pressure rises ?

What happens when secondary oil pressure

decreases slowly ?

What happens when secondary oil pressure decreases very fast ?

CONTROL V/V SERVO-MOTOR

Test Solenoids

Solenoids (SVX)

Change-Over

ValveMain Trip

Valve

Main Trip Valve

Remote Trip Solenoid Valve

Successful

Starting Device

Speeder Gear

Test Valve Stop Valve Servo-Motor

Test Solenoid

Reset Solenoids

Aux Follow-up Valve

Aux Second Aux Second OilOil

Primary Oil

Aux-Start Up

Control Oil

Start-up Oil

Aux Trip Oil

HTD

Trip Oil

Automatic Turbine Test

THANKS FOR LI STENI NG TO AND THANKS FOR LI STENI NG TO AND SPARI NG YOUR VALUABLE TI ME SPARI NG YOUR VALUABLE TI ME

FOR THI S PRESENTATI ONFOR THI S PRESENTATI ON

THANKS GIVINGTHANKS GIVING

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