Governing System of 210mw Kwu
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Transcript of Governing System of 210mw Kwu
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GOVERNING SYSTEM OF 210MW GOVERNING SYSTEM OF 210MW KWU TURBINE”KWU TURBINE”
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Introduction:-Introduction:- To govern means to control and regulate certain parameters to achieve expected functional requirements. Governing system can, therefore be preliminary defined as the system designed to achieve functional requirement of turbo-generator operation by controlling and regulating steam turbine input parameters viz. turbine inlet pressure of steam, mass flow rate of steam etc.
Methods of governing:-Methods of governing:- Generally for utility steam turbines following two methods are popularly used:-1] Nozzle governing-
2] Throttle governing-
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Functions of governing system:-Functions of governing system:-
1] To modulate the control valves to adjust the steam flow as per the load, keeping speed constant.
2] Control of turbine speed at no load to permit the unit to be synchronized to the grid.
3] Control of the turbine load when running in parallel with other generating sets. 4] Protective gears to ensure safe operation of the turbine under all conditions.
5] Must have facility to test the protective devices.
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Governing system of 210MW KWU unit:-Governing system of 210MW KWU unit:-
The turbine of 210MW KWU unit is equipped with electro-hydraulic governing system to facilitate the operation of the turbo –set in inter- connected grid system. The electrical measuring and processing of signal offer the advantage such as flexibility, dynamic stability and simple relationship of complicated functional relationship.
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Structure of electro-hydraulic control Structure of electro-hydraulic control system:-system:-
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Structure of electro-hydraulic Structure of electro-hydraulic
controller:controller: • The structure of electro- hydraulic controller is comprises of
following sub-control loops:• 1] Speed control loop.• 2] Load control loop• 3] Pressure control loop.• 4] Selection circuit (control mode selection).• 5] Admission control loop (position controller).
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Electro-hydraulic controller block Electro-hydraulic controller block diagramdiagram
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S.No Name of Oil Source & pressure Purpose Colour Code1. Control Oil MOP/AOP ( 7-8.5 Kg/cm2) To establish Trip Oil, Aux
Trip Oil, Trip Oil, Start-up Oil, Aux Start-up Oil, Aux Secondary Oil, Secondary
Oil, Primary Oil, Etc2.
Trip OilMain Trip Valve (4.8-6
Kg/cm2)To reset , Open & Trip
stop valve
3. Aux Trip Oil
Main Trip Valve (4.8-6 Kg/cm2)
To trip Hydraulic Trip Device
4. Start-up Oil
Starting Device ( 5.5 Kg/cm2)
To assist Resetting & Opening Stop Valves
5. Aux Start-up Oil
Starting Device ( 5.5 Kg/cm2)
To Reset Main Trip Valve & Hydraulic Trip Device
6. Aux Secondary Oil
Speeder Gear ( 2.3-4.8 Kg/cm2)
Input Signal to Hydraulic Converter
7. Secondary Oil (HP/IP)
Hyd/Electro-Hyd Converter ( 0-6 Kg/cm2)
To govern HP/IP Control Valve opening
8.Primary Oil
Primary Oil Pump ( 0-2.3 Kg/cm2)
Feedback speed signal for HG
9.Test Oil
Over Speed Test Device ( 2.0 Kg/cm2)
To test Over Speed Test Device
10. Drains
Different oils, their colour codes, sources and purpose in KWU Governing System
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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 GOVERNING SYSTEMBLOCK DIAGRAM OF GOVERNING SYSTEM
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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 DEVICE
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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 MTV
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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 RTSV
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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 TRIPDEVICE
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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
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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
OIL
T
O M
TV
MTV
S/D
RTSV’S
TEST VALVE
STOP V/V OPERATION
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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
OF STOP VALVE
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TURBINE OVERSPEED TRIP DEVICE
FLY BOTL
Aux Trip Oil
AUX START-UP OIL TO RESET
AUX TRIP OIL
Drain
TURBINE OVERSPEED TRIP DEVICE
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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
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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
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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
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THANK YOU