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TA

KWU GOVERNING SYSTEMBASICS OF GOVERNING SYSTEM DRAWINGS ARE NOT AS PER ACTUAL THIS PRESENTATION HAS BEEN PREPARED JUST FOR UNDERSTANDING THE SYSTEM

A

HP TURBINE MS

IP TURBINE

LP TURBINE

TG SET

CRH NRV

HPSV HPCV

IPSV IPCV

GENERATOR

HPCV CRH NRV HPSV

IPCV IPSV

MS

HRH

CondenserBOILER

GENERAL SCHEMESteam from boiler

Opening SV Opening CV Turbine Rolling Synchronization De-acceleration Acceleration Tripping

Turbine/Unit LockOut TrippingSteam to turbine

100MW 80MW 120MW 120MW 80MW 3000rpm 3000RPM 2900 rpm 3000rpm 3100rpm

80MW 100MW 120MW

Turbine

Generating StationGenerator Speed

Load Consumer

3150

3100

3000

2900

2850

1500

180

Different oils, their colour codes, sources and purpose in KWU Governing SystemS.No 1. Name of Oil Source & pressure MOP/AOP ( 7-8.5 Kg/cm2) Purpose

LEGENDSColour Code

Control Oil

To establish Trip Oil, Aux Trip Oil, Trip Oil, Start-up Oil, Aux Start-up Oil, Aux Secondary Oil, Secondary Oil, Primary Oil, Etc To reset , Open & Trip stop valve To trip Hydraulic Trip Device To assist Resetting & Opening Stop Valves To Reset Main Trip Valve & Hydraulic Trip Device Input Signal to Hydraulic Converter

2. 3. 4.

Trip Oil Aux Trip Oil Start-up Oil

Main Trip Valve (4.8-6 Kg/cm2) Main Trip Valve (4.8-6 Kg/cm2) Starting Device ( 5.5 Kg/cm2) Starting Device ( 5.5 Kg/cm2)

5.

Aux Start-up Oil6. Speeder Gear ( 2.3-4.8 Kg/cm2)

Aux Secondary Oil7.

Secondary Oil (HP/IP) Primary Oil

Hyd/Electro-Hyd Converter ( 0-6 Kg/cm2)

To govern HP/IP Control Valve opening

8. 9. 10.

Primary Oil Pump ( 0-2.3 Kg/cm2) Over Speed Test Device ( 2.0 Kg/cm2)

Feedback speed signal for HG To test Over Speed Test Device

Test OilDrains

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 CONVERTER. OUTPUT OF HYDRAULIC/ELECTRO-HYDRAULIC

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 STARTUP OIL.

BLOCK DIAGRAM OF GOVERNING SYSTEMFiltered Control OilAOP Filter Trip Oil

TEST V/V

STOP V/V SERVO MOTOR

Remote Trip Solenoid Valves

Main Trip ValvesSTOP & CONTROL VALVE CONTROL VALVE SERVO MOTOR Secondary Oil Aux Trip Oil

MOP AOP Discharge header

Aux Start-up Oil

Electro-Hyd Converter

Hyd Converter

Start-up Oil

Starting Device

Filtered Controlled Oil

Hyd. Trip Device

RAISING STARTING DEVICE POSITION TO DE-PRESSURISE BRINGING& AUX STATR-UP OIL TO OPEN STOP VALVES AND START-UP THE STARTING DEVICE TO 0 POSITION TO BUILD START-UP & AUX STATR-UP OIL TO RESET STOP& MAIN TRIP PRODUCING AUX SECONDARY OIL VALVES AND HYD. TRIP DEVICEHand Wheel Motor

STARTING DEVICETO MTV & HTD V/VCONTROL OIL FROM AOP/MOP

Drain

Aux Start-up Oil (0 Kg/cm2) (5.5 Kg/cm2)

TO TEST V/V OF STOP V/VDrain

Start-up Oil (5.5 Kg/cm2) (0 Kg/cm2)

75 50Starting Device In %

100

25 0

STARTING DEVICE

Position at MCR

RESETTING OF MTV FOR TRIPPING OF TRIP/AUX ESTABLISHINGMTV FOR KILLING TRIP OIL TRIP OIL

MAIN TRIP VALVE

DRAIN

TRIP OIL TO RESET/OPEN STOP VALVE & FOLLOW-UP VALVES ETC TO PRODUCE SECONDARY OIL (4.8-6.0 Kg/cm2) SECONDARY OIL (0 Kg/cm2)

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

AUX TRIP OIL TO HYDRAULIC TRIP DEVICES (4.8-6.0 Kg/cm2) TRIP DEVICES (0 Kg/cm2)

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

RESETTING OF MTVA O P D i s h a r g e h e a d e r AUX TRIP OIL TO HYDRAULIC TRIPING DEVICES AOP/ MOP

REMOTE TRIP SOLENOID OPERATED VALVESTRIP OIL TO HOLD STOP V/VS & AND TO PRODUCE SECONDARY OIL

CONTROL OIL FROM AOP/MOPFilter

DRAIN

AUX START-UP OIL TO RESET MTV & HTD

TRIPPING OF MTV THROUGH RTSV (ELECTRICAL)

TRIPPING THROUGH RTSV

REMOTE TRIP SOLENOID OPERATED VALVESTRIP OIL TO HOLD STOP V/VS & AND TO PRODUCE SECONDARY OIL

CONTROL OIL FROM AOP/MOPFilter

DRAIN

AUX START-UP OIL TO RESET MTV

AUX TRIP OIL TO HYDRAULIC TRIPING DEVICES

TRIPPING OF MTV THROUGH HYDRAULIC TRIP DEVICE (MECHANICAL)

TRIPPING THROUGH HYD TRIPDEVICEREMOTE TRIP SOLENOID OPERATED VALVES

TRIP OIL TO HOLD STOP V/VS & AND TO PRODUCE SECONDARY OIL

CONTROL OIL FROM AOP/MOPFilter

DRAIN

AUX START-UP OIL TO RESET HYD TRIP DEVICES AUX TRIP OIL TO HYDRAULIC TRIPING DEVICES

AUX START-UP OIL TO RESET MTV

HYDRAULIC TRIP DEVICEAUX TRIP OIL TO THE HYDRAULIC TRIPING DEVICES

RESETTING OF RTSV, HYD. TRIP DEVICES & MTV THROUGH

RESETTING OF RTSV, HYD. TRIP DEVICES & MTV THROUGH REMOTE TRIP SOLENOID OPERATED VALVES

TRIP OIL TO HOLD STOP V/VS & AND TO PRODUCE SECONDARY OIL

CONTROL OIL FROM AOP/MOPFilter

DRAIN

AUX START-UP OIL TO RESET MTV

AUX START-UP OIL TO RESET HYDRAULIC TRIP DEVICES

HYDRAULIC TRIP DEVICEAUX TRIP OIL TO THE HYDRAULIC TRIPING DEVICES

STOP V/V OPERATIONSTART-UP OIL TO TEST V/V TRIP OIL TO STOP V/V RTSVSTEST VALVE

MTV

DRAIN

Filter

AUX START-UP OIL TO MTV

S/D

AUX START-UP OIL TO HYD TRIP DEVICE HYD TRIP DEVICE AUX TRIP OIL TO HYD TRIP DEVICE

STOP VALVE SERVOMOTOR

OPENING OF STOP VALVES BY RAISING RESETTING OF RTSV(DE-ENERGIZING) & STARTING DEVICE HYD. TRIP DEVICES & MTV THROUGH DRAIN STARTING DEVICE AT 0 POSITION

STOP VALVE

STOP VALVE SERVO-MOTOR

RESETTING/OPENING/TRIPPING OF STOP VALVE

TRIP OIL ABOVE PISTON CYLINDER SPRING

Drain

PISTON SPRING DISC PISTON DISC

TRIP OIL BELOW PISTON DISC

TRIPPING RESETTING OPENING

TURBINE OVERSPEED TRIP DEVICEAUX START-UP OIL TO RESET AUX TRIP OIL

FLY BOTL Drain

Aux Trip Oil

TURBINE OVERSPEED TRIP DEVICE

THRUST BEARING TRIP DEVICEAUX START-UP OIL TO RESET TURBINE SHAFT AUX TRIP OIL

TEST OIL

RESETTING OF Thrust Bearing TRIPPING OF Thrust Bearing TRIP DEVICE

Drain

Resetting Of Low Vacuum Trip Device Tripping Of Low Vacuum Trip DeviceVacuum Atmosphere

Low Vacuum Trip Device

Drain Control Oil Aux Trip Oil Drain

LOW VACUUM TRIP DEVICE

Aux Follow-up Piston

HYDRAULIC GOVERNORAux Secondary Oil To Hyd. Governor

Starting Device

Speeder Gear

7550Trip Oil From MTV

100

25 0

Speeder Gear In %

Aux Follow-up Valve Control Oil Primary Oil (0-2.3Kg/cm2) Speeder Gear Primary Oil Pump

75 50 25 0

100

Starting Device In %

Starting Device

Link

Starting Device Speeder Gear

Aux Follow-up Piston Aux Secondary Oil To Hyd. Governor

Start-up oil

75

100

50Control oil

25 0

Starting Device In %

Aux Start-up oil

7550Primary Oil LINK Primary Oil Pump Starting Device In %

100

25 0

Trip oil From MTV

HP Sec. Oil

HG & EHGAux Sec Oil from S/G Hydraulic Converter Amplifier PistonControl Oil

Follow - up valves IP Sec. Oil

Trim Device

HP Sec. Oil Electro-Hydraulic Converter0-10V Supply from ATRS Control Oil

Trip Oil From MTV

Follow - up valves IP Sec. Oil

Amplifier PistonTrim Device

Trip Oil From MTV

HG/EHG

INPUT

HYD MINM SELECTIONGOVERNER OUTPUT 0% DRAIN 100% OPEN OR 0% CLOSE

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

ORIFICE

HYDRAULIC MINIMUM SELECTION

ELECTRO-HYD GOVERNOR

HYDRAULIC GOVERNOR

DRAIN-1 OUTPUT

DRAIN-2

CONTROL V/V SERVO-MOTOR What happens when secondary oil pressure Pilot Valve of HPCV What happensdecreases very fastoil pressure rises when secondary ? ? decreases slowly ?Drain

d Spring side

e Valve side

Control Oil

Drain

e Valve side

Drain

Secondary Oil

Test Valve

Stop Valve Servo-Motor

Trip Oil

Solenoids (SVX)

Automatic Turbine TestSuccessfulTest Solenoids

Test Solenoid Start-up Oil

Main Trip Valve

Change-Over Valve

Aux-Start Up Control Oil Starting Device Aux Follow-up Valve Speeder Gear

Aux Second Oil

HTD Reset Solenoids Main Trip Valve

Remote Trip Solenoid Valve

Aux Trip Oil

Primary Oil

THANKS GIVING

THANKS FOR LISTENING TO AND SPARING YOUR VALUABLE TIME FOR THIS END OF SHOW PRESENTATION

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