steam turbine governor
Post on 28-Apr-2015
733 Views
Preview:
DESCRIPTION
TRANSCRIPT
KWU GOVERNING KWU GOVERNING SYSTEMSYSTEM
TTA A
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 Code1.1. Control OilControl Oil MOP/AOP ( 7-8.5 Kg/cmMOP/AOP ( 7-8.5 Kg/cm22)) To establish Trip Oil, Aux Trip Oil, To establish Trip Oil, Aux Trip Oil,
Trip Oil, Start-up Oil, Aux Start-Trip Oil, Start-up Oil, Aux Start-up Oil, Aux Secondary Oil, up Oil, Aux Secondary Oil,
Secondary Oil, Primary Oil, EtcSecondary Oil, Primary Oil, Etc2.2.
Trip OilTrip OilMain 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 To assist Resetting & Opening Stop ValvesStop Valves
5.5. Aux Start-up Aux Start-up OilOil
Starting Device ( 5.5 Kg/cmStarting Device ( 5.5 Kg/cm22)) To Reset Main Trip Valve & To Reset Main Trip Valve & Hydraulic Trip DeviceHydraulic Trip Device
6.6. Aux Secondary Aux Secondary OilOil
Speeder Gear ( 2.3-4.8 Kg/cmSpeeder Gear ( 2.3-4.8 Kg/cm22)) Input Signal to Hydraulic Input Signal to Hydraulic ConverterConverter
7.7. Secondary Oil Secondary Oil (HP/IP)(HP/IP)
Hyd/Electro-Hyd Converter ( 0-6 Hyd/Electro-Hyd Converter ( 0-6 Kg/cmKg/cm22))
To govern HP/IP Control Valve To govern HP/IP Control Valve openingopening
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 OilOver Speed Test Device ( 2.0 Over Speed Test Device ( 2.0
Kg/cmKg/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 SYSTEMBLOCK 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
top related