GOVERNING SYSTEM OF 210MW KWU

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GOVERNING SYSTEM OF 210MW KWU TURBINE” : 

GOVERNING SYSTEM OF 210MW KWU TURBINE”

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:- Generally for utility steam turbines following two methods are popularly used:-1] Nozzle governing-2] Throttle governing- : 

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:- Generally for utility steam turbines following two methods are popularly used:-1] Nozzle governing-2] Throttle governing-

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. : 

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.

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. : 

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.

Structure of electro-hydraulic control system:- : 

Structure of electro-hydraulic control system:-

Structure of electro-hydraulic controller: : 

Structure of electro-hydraulic 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).

Electro-hydraulic controller block diagram : 

Electro-hydraulic controller block diagram

Slide 8: 

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

BLOCK DIAGRAM OF GOVERNING SYSTEM : 

AOP MOP AOP Discharge header Filtered Control Oil Remote Trip Solenoid Valves Main Trip Valves Hyd. Trip Device TEST V/V STOP V/V SERVO MOTOR STOP & CONTROL VALVE CONTROL VALVE SERVO MOTOR Hyd Converter Electro-Hyd Converter Starting Device Secondary Oil Trip Oil Aux Start-up Oil Start-up Oil Aux Trip Oil Filtered Controlled Oil Filter BLOCK DIAGRAM OF GOVERNING SYSTEM

STARTING DEVICE : 

TO TEST V/V OF STOP V/V TO MTV & HTD V/V CONTROL OIL FROM AOP/MOP 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

RESETTING OF MTV : 

REMOTE TRIP SOLENOID OPERATED VALVES MAIN TRIP VALVE 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 Filter DRAIN AOP Disharge header AOP/ MOP RESETTING OF MTV

TRIPPING THROUGH RTSV : 

REMOTE TRIP SOLENOID OPERATED VALVES MAIN TRIP VALVE 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 Filter DRAIN TRIPPING THROUGH RTSV

TRIPPING THROUGH HYD TRIPDEVICE : 

AUX TRIP OIL TO THE HYDRAULIC TRIPING DEVICES AUX START-UP OIL TO RESET MTV HYDRAULIC TRIP DEVICE REMOTE TRIP SOLENOID OPERATED VALVES MAIN TRIP VALVE 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 Filter DRAIN AUX START-UP OIL TO RESET HYD TRIP DEVICES TRIPPING THROUGH HYD TRIPDEVICE

RESETTING OF RTSV, HYD. TRIP DEVICES & MTV THROUGH : 

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 Filter DRAIN RESETTING OF RTSV, HYD. TRIP DEVICES & MTV THROUGH

STOP V/V OPERATION : 

RESETTING OF RTSV(DE-ENERGIZING) & HYD. TRIP DEVICES & MTV THROUGH STARTING DEVICE AT “0” POSITION Filter DRAIN 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 AUX START-UP OIL TO MTV MTV S/D RTSV’S TEST VALVE STOP V/V OPERATION

RESETTING/OPENING/TRIPPING OF STOP VALVE : 

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

TURBINE OVERSPEED TRIP DEVICE : 

TURBINE OVERSPEED TRIP DEVICE FLY BOTL Aux Trip Oil AUX START-UP OIL TO RESET AUX TRIP OIL Drain TURBINE OVERSPEED TRIP DEVICE

THRUST BEARING TRIP DEVICE : 

TURBINE SHAFT AUX START-UP OIL TO RESET AUX TRIP OIL Drain TRIPPING OF Thrust Bearing TRIP DEVICE RESETTING OF Thrust Bearing TRIP DEVICE TEST OIL THRUST BEARING TRIP DEVICE

Low Vacuum 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

HG/EHG : 

HP Sec. Oil IP Sec. Oil Follow - up valves Hydraulic Converter Aux 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. Oil HG & EHG HG/EHG

THANK YOU : 

THANK YOU

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