GOVERNING SYSTEM OF 210MW LMW

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Presentation Description

STEAM TURBINE GOVERNING &PROTECTION SYSTEM GOVERNING SYSTEM HIGH RESPONSE HYDROMECHANICAL GOVERNING SYSTEM STABLE SPEED CONTROL IN ISOLATED OPERATION OF THE SET THE DESIRED DEGREE OF LOAD DISTRIBUTION BETWEEN SETS RUNNING IN PARALLEL 4) TO BRING THE TURBINE SPEED SMOOTHLY FROM BARRING GEAR TO SYNCHRONISING SPEED UNDER THE CONTROL OF OPERATOR ACTION. a) NORMAL GOVERNING MECHANISM b) PROTECTION MECHANISM C) PRE- EMERGENCY DEVICES Irrespective of variation in load, the generators are required to run at constant speed. However when load on generator varies there will be corresponding variation of load on turbine also if the I/P to the turbine remains same, the speed of the turbine tends to increase or decrease depending on whether there is decrease or increase in load. This will cause speed of generator also vary. In order to maintain constant speed, the steam flow through turbine need to be regulated. Such an operation of speed regulation is known as GOVERNING. It is done automatically by means of Governor. All TG sets have got Hydraulic Governor. ELEMENTS OF SPEED GOVERNER PILOT BLOCK LOAD/SPEED CONTROL PILOT VALVE FOLLOW-PILOT VALVE SUMMATION PILOT VALVE SPEED GOVERNER INTERMEDIATE-PILOT VALVE ) CONTROL VALVE SERVOMOTOR 7) DIFFERENTIATOR (ANTICIPATORY GEAR) 8) LOAD LIMITER 9)ELECTROHYDRAULIC TRANSDUCER (EHT) 10) CONTROL VALVE SERVOMOTOR ELEMENTS OF PROTECTION SYSTEM

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Presentation Transcript

WELCOME : 

WELCOME

PRESENTED BY : 

PRESENTED BY ASHOK RASEKAR (DyEE ,CSTPS CHANDRAPUR)

210 MW LMW : 

210 MW LMW STEAM TURBINE GOVERNING AND PROTECIION SYSTEM

STEAM TURBINE GOVERNING &PROTECTION SYSTEM : 

STEAM TURBINE GOVERNING &PROTECTION SYSTEM GOVERNING SYSTEM HIGH RESPONSE HYDROMECHANICAL GOVERNING SYSTEM STABLE SPEED CONTROL IN ISOLATED OPERATION OF THE SET THE DESIRED DEGREE OF LOAD DISTRIBUTION BETWEEN SETS RUNNING IN PARALLEL

Slide 5: 

4) TO BRING THE TURBINE SPEED SMOOTHLY FROM BARRING GEAR TO SYNCHRONISING SPEED UNDER THE CONTROL OF OPERATOR ACTION. a) NORMAL GOVERNING MECHANISM b) PROTECTION MECHANISM C) PRE- EMERGENCY DEVICES

AN ISOLATED TG SET : 

AN ISOLATED TG SET Irrespective of variation in load, the generators are required to run at constant speed. However when load on generator varies there will be corresponding variation of load on turbine also if the I/P to the turbine remains same, the speed of the turbine tends to increase or decrease depending on whether there is decrease or increase in load. This will cause speed of generator also vary. In order to maintain constant speed, the steam flow through turbine need to be regulated. Such an operation of speed regulation is known as GOVERNING. It is done automatically by means of Governor. All TG sets have got Hydraulic Governor. 6

Slide 7: 

7 FLYBALL SPEED GOVERNOR LOAD LIMITOR 0 TO FULL LOAD SPEEDER GEAR FOLLOW PILOT VLV WITH 14 % OVER SPEED PROTECTION EMERGENCY GOVERNOR PILOT VALVE EMERGENCY GOVERNOR WITH MECH STRIKER ISPUG SUMMATION PILOT VALVE DIFFERENTIATOR INTERMEDIATE PILOT VALVE CONTROL VALVE SERVOMOTOR HP & IP CONTROL VALVES THROUGH CVSM LINKAGE LOAD SPEED CTRL PILOT VLV IV STOP VALVE SERVOMOTOR EMERGENCY STOP VALVE SERVOMOTOR MECHANICAL LINK MECHANICAL LINK S/D Switch GOVERNING SYSTEM RUSSIAN TURBINE (210MW) SIGNAL FROM CONTROL SYSTEM

ELEMENTS OF GOVERNING SYSTEM : 

ELEMENTS OF GOVERNING SYSTEM Load/Speed control pilot valve Follow up pilot valve Summation pilot valve SPEED GOVERNER PILOT BLOCK

SPEED GOVERNER PILOT BLOCK : 

SPEED GOVERNER PILOT BLOCK

ELEMENTS OF SPEED GOVERNER PILOT BLOCK : 

ELEMENTS OF SPEED GOVERNER PILOT BLOCK LOAD/SPEED CONTROL PILOT VALVE FOLLOW-PILOT VALVE SUMMATION PILOT VALVE

ELEMENTS OF GOVERNING SYSTEM : 

ELEMENTS OF GOVERNING SYSTEM SPEED GOVERNER 4)

INTERMEDIATE-PILOT VALVE : 

INTERMEDIATE-PILOT VALVE 5)

) : 

) 6) CONTROL VALVE SERVOMOTOR 7) DIFFERENTIATOR (ANTICIPATORY GEAR) 8) LOAD LIMITER 9)ELECTROHYDRAULIC TRANSDUCER (EHT) 10) CONTROL VALVE SERVOMOTOR

CONTROL VALVE SERVOMOTOR : 

CONTROL VALVE SERVOMOTOR 6)

DIFFERENTIATOR (ANTICIPATORY GEAR) : 

DIFFERENTIATOR (ANTICIPATORY GEAR) 7)

LOAD LIMITER : 

LOAD LIMITER 8)

ELECTROHYDRAULIC TRANSDUCER (EHT) : 

ELECTROHYDRAULIC TRANSDUCER (EHT) 9)

Slide 21: 

10)

ELEMENTS OF PROTECTION SYSTEM : 

ELEMENTS OF PROTECTION SYSTEM 1) EMERGENCY GOVERNOR LEVERS, INDICATORS AND TESTING COCK 2) TURBINE SHUT DOWN SWITCH 3) EMERGENCY GOVERNOR PILOT VALVES 4) EMERGENCY STOP VALVE SERVOMOTOR 5) INTERCEPTOR VALVE SERVOMOTOR

GOVERNING. ANiD PROTECTION SYSTEM : 

GOVERNING. ANiD PROTECTION SYSTEM The turbine is equipped with a high response hydromechanical system of automatic governing which ensures smooth and stable operation of the turboset under all conditions of operation. The system is capable of sustaining full load dump from the generator without the operation of protection system and thus enables quick reloadIng of the turboset, The turbine is also provided with reliable protection devices which ensure the stoppage of turbIne under emergent conditions of Its operation.

SPEED GOVERNER : 

SPEED GOVERNER SPEED GOVERNOR IS THE MAIN SENSING ELEMENT OF THE GOVERNING SYSTEM. IT SENSES SPEED VARIATION AND TRANSFORMS IT INTO A LINEAR DISPLACEMENT OF SLEEVE. SPEED GOVERNOR IS OF THE CENTRIFUGAL FLYWEIGHT BAND SPRING TYPE IT IS MOUNTED ON THE SHAFT OF MAIN OIL PUMP.

Slide 27: 

The principal sensing organ, is directly coupled to the turbine rotor through a gear coupling and has been so designed to maintain automatically the speed of the turboset within the static speed regulation of 4 ± 1%. The speed governor Is hydraulically coupled to the speed governor pilot block whichis located within the front bearing pedestal. The pilot block is provided with a control gear (Synchronise) which acomplishes the following basic purposes

SPEED GOVERNOR : 

SPEED GOVERNOR ANY DIFFERENCE BETWEEN THE POWER GENERATED BY THE TURBINE AND THE LOAD ON IT,WOULD CAUSE CHANGE IN THE SPEED OF THE SET .THIS CHANGE IS SENSED BY SPEED GOVERNOR. THE GOVERNOR SLEEVE MOVES PROPORTIONAL TO SPEED CHANGE .

Slide 29: 

(a) Charging of the emergency governor pilots and opening of the emergency stop valves, Interceptor valves and control valves. ) Speed changing of the turboset at no load and synchronising the turboset at any frequency. (c) Distribution of load during parallel operation. (d) Increasing of speed for testing the strikers of the emergency governor at no load. The control gear can be operated either manually from the turbine or by remote control from unit control desk.

Slide 30: 

Emergency governor with two centrifugal strikers, which operate at 11-12% above the rated speed, Is Incorporated In the system to protect the turbine against excessive over speeds. As soon as the emergency governor operates, the emergency stop vlaves, control valves of HPT and IPT and also the interceptor valves of IPT get closed. The stop valves and the Interceptor valves can again be opened as soon as the speed falls to 101% of the rated value

Slide 31: 

4) FollowIng additional protections have been incorporated in the turboset ) Initial steam pressure unloading gear (ISPUG) comes into action when the Initial steam pressure drops to 117 ± 2 ata and completely unloads the set at 91 ata. ) Electro hydraulic transducer Is an instiument for converting electrical signal 2 seconds delayed In time from generator circuit breaker tripping, into hydraulic signal in the primary sensitive oil line, resulting in closure of control valves. *9 A back-up protection has been provided to trip the turbine at 14 to 15% overspeed in case emergency governor falts to operate.

FOLLOW -PILOT VALVE : 

FOLLOW -PILOT VALVE FOLLOW PILOT SPOOL FOLLOWS THE MOVEMENT OF GOVERNOR SLEEVE AND ACTUATES THE SUMMATION PILOT VALVE THROUGH LEVER. FOLLW PILOT SPOOL MECHANICALLY CONNECTED TO SUMMATION PILOT SPOOL AND LOAD/SPEED CONTROL VALVE THROUGH LEVER.

LOAD /SPEED CONTROL PILOT VALVE : 

LOAD /SPEED CONTROL PILOT VALVE IT CONVERTS MECHANICAL SIGNAL FROM SPEEDER GEAR INTO HYDRAULIC SIGNALS TO EMERGENCY GOVERNOR PILOT VALVE, EMERGENCY STOP VALVE SERVOMOTOR AND INTERCEPTOR VALVE SERVOMOTER. IT ACTUATE THE SUMMATION PILOT VALVE THROUGH LEVER.

SUMMATION PILOT VALVE : 

SUMMATION PILOT VALVE IT RECEIVES SIGNAL FROM FOLLO PILOT VALVE AND LOAD/ SPEED CONTROL PILOT VALVE THROUGH LEVER AND ACTUATES DIFFERENTIATOR AND INTERMEDIATE PILOT VALVE

INTERMEDIATE PILOT VALVE : 

INTERMEDIATE PILOT VALVE THE INTERMEDIATE PILOT VALVE AMPLIFIES THE HYDRAULIC SIGNALS FROM SUMMATION PILOT VALVE, DIFFERENTIATOR, ELECTRO-HYDRAULIC TRANS DUCER AND EGP VALVE. THE AMPLIFIED HYDRAULIC SIGNALS IS, IN TURN, TRANSMITTED TO CONTROL VALVE SERVOMOTOR.

DIFFERENTIATOR [Anticipatory gear] : 

DIFFERENTIATOR [Anticipatory gear] THE DIFFERENTIATOR ESSENTIALLY CAUSES ANTICIPATORY CLOSURE OF CONTROL VALVES OF HPT AND IPT , IN CASE THE LOAD THROW OFF IS MORE THAN 50% OF THE NOMINAL, THUS PREVENTING UNDUE SPEED RISE.

EMERGENCY GOVERNOR PILOT VALVE : 

EMERGENCY GOVERNOR PILOT VALVE IT IS AN INTERMEDIATE ELEMENT TO CONVERT THE MECHANICAL SIGNAL RECEIVED FROM EMERGENCY GOVERNOR TO A HYDRAULIC SIGNAL. IT RECEIVES HYDRAULIC SIGNALS FROM FOLLOW PILOT VALVE AND TURBINE SHUTDOWN SWITCH ALSO. HYDRAULIC SIGNAL IS TRANSFERRED TO EMERGENCY STOP VALVE SERVOMOTORS, INTERCEPTER VALVES SERVOMOTORS AND CONTROL VALVE SERVOMOTOR TO TRIP THE SET.

ELECTRO-HYDRAULIC TRANSDUCER : 

ELECTRO-HYDRAULIC TRANSDUCER IT CONVERTS ELECTRICAL SIGNAL DERIVED FROM GENRETOR CIRCUIT BREAKER INTO HYDRAULIC SIGNAL IN THE PRIMARY SENSITIVE OIL LINE.

SPEEDER GEAR : 

SPEEDER GEAR IT ESSENTIALLY ACTUATES LOAD/SPEED CONTROL PILOT VALVE. THE SPEEDER GEAR CAN ACTUATES EITHER BY OPERATING THE HAND WHEEL AT THE FRONT PEDASTAL OR BY REMOTE OPERATION FROM UNIT CONTROL PANNEL.

Slide 41: 

Load/Speed control pilot valve

Slide 42: 

LOAD/SPEED CONTROL PILOT VALVE EGPV ESV/IV SOP EGPV CHARGING OIL OIL TO ESV/IV 20 Kg/cm2 control oil 20 Kg/cm2 Protection oil close open TO FOLLOW UP V/V, SUMMATION V/V Speeder gear 2.5 mm Sp/gr upto 6.7mm Load/Speed control pilot valve

Slide 43: 

LOAD/SPEED CONTROL PILOT VALVE ESV/IV SOP EGPV CHARGING OIL OIL TO ESV/IV 20 Kg/cm2 control oil 20 Kg/cm2 Protection oil close open TO FOLLOW UP V/V, SUMMATION V/V Speeder gear 2.5 mm Sp/gr upto 6.7mm Load/Speed control pilot valve DRAIN

Slide 44: 

LOAD/SPEED CONTROL PILOT VALVE ESV/IV SOP EGPV CHARGING OIL OIL TO ESV/IV 20 Kg/cm2 control oil 20 Kg/cm2 Protection oil close open TO FOLLOW UP V/V, SUMMATION V/V Speeder gear 2.5 mm Sp/gr upto 6.7mm Load/Speed control pilot valve DRAIN

Slide 45: 

FOLLOW UP PILOT VALVE

Slide 46: 

MOP SOP FROM INTERMEDIATE VALVE FROM DIFFERENTIATOR 8.8 kg/cm2 7.7 kg/cm2 SUMMATION PILOT VALVE

Slide 47: 

FROM INTERMEDIATE VALVE FROM DIFFERENTIATOR LOAD/SPEED CONTROL PILOT VALVE FOLLOW UP PILOT VALVE SUMMATION PILOT VALVE

Slide 48: 

INTERMEDIATE PILOT VALVE

Slide 49: 

SEC. SENSING OIL FROM FEEDBACK valve 20 kg/cm2 control oil from SOP/MOP Primary sensing oil to summation pilot valve Oil drain to mop suction line Press. Adjusting throttle v/v Connected to EGPV port INTERMEDIATE PILOT VALVE

Slide 50: 

CVSM

Slide 51: 

CVSM CVSM PILOT VALVE FEEDBACK VALVE

Slide 52: 

To intermediate pilot valve To cvsm piolt

Slide 53: 

MOT MOP CVSM Follow up pilot valve Summation pilot valve Intermediate pilot valve CV-1 Load/Speed control pilot v/v Feedback v/v CVSM Pilot v/v From Diff.8.8 kg/cm2 Sec.sensing oil 10.3 kg/cm2 20 kg/cm2 control oil EGPV charging oil line Oil to ESV/IV 20KG/CM2 20KG/CM2 Prot. oil 20KG/CM2 Drain to mop suction SOP Steam From feedback OPEN OPEN CV-2 HPT CV 1 2 3 4 Speeder gear 20 kg/cm2 Charged upto 6.7 mm Charged upto 5.9 mm Sp. Gear 13 kg/cm2 5 kg/ cm2 7.7kg Drain 20 kg 8.8 kg 7.7 kg 20KG/CM2 EGPV ESV IV E/ TRIP TTS Drain Drawn by -- A.D.RASEKAR Cam DIFF 15.4kg

Slide 55: 

MOT MOP CVSM Follow up pilot valve Summation pilot valve Intermediate pilot valve CV-1 Load/Speed control pilot v/v Feedback v/v CVSM Pilot v/v From Diff.8.8 kg/cm2 Sec.sensing oil 10.3 kg/cm2 20 kg/cm2 control oil EGPV charging oil line Oil to ESV/IV 20KG/CM2 20KG/CM2 Prot. oil 20KG/CM2 Drain to mop suction SOP Steam From feedback OPEN OPEN CV-2 HPT CV 1 2 3 4 Speeder gear 20 kg/cm2 Charged upto 6.7 mm Charged upto 5.9 mm Sp. Gear 13 kg/cm2 5 kg/ cm2 7.7kg Drain 20 kg 8.8 kg 7.7 kg 20KG/CM2 EGPV ESV IV E/ TRIP TTS Drain Drawn by -- A.D.RASEKAR Cam DIFF 15.4kg

Slide 56: 

MOT MOP CVSM Follow up pilot valve Summation pilot valve Intermediate pilot valve CV-1 Load/Speed control pilot v/v Feedback v/v CVSM Pilot v/v From Diff.8.8 kg/cm2 Sec.sensing oil 10.3 kg/cm2 20 kg/cm2 control oil EGPV charging oil line Oil to ESV/IV 20KG/CM2 20KG/CM2 Prot. oil 20KG/CM2 Drain to mop suction SOP Steam From feedback OPEN OPEN CV-2 HPT CV 1 2 3 4 Speeder gear 20 kg/cm2 Charged upto 6.7 mm Charged upto 5.9 mm Sp. Gear 13 kg/cm2 5 kg/ cm2 7.7kg Drain 20 kg 8.8 kg 7.7 kg 20KG/CM2 EGPV ESV IV E/ TRIP TTS Drain Drawn by -- A.D.RASEKAR Cam DIFF 15.4kg

Slide 57: 

MOT MOP CVSM Follow up pilot valve Summation pilot valve Intermediate pilot valve CV-1 Load/Speed control pilot v/v Feedback v/v CVSM Pilot v/v From Diff.8.8 kg/cm2 Sec.sensing oil 10.3 kg/cm2 20 kg/cm2 control oil EGPV charging oil line Oil to ESV/IV 20KG/CM2 20KG/CM2 Prot. oil 20KG/CM2 Drain to mop suction SOP Steam From feedback OPEN OPEN CV-2 HPT CV 1 2 3 4 Speeder gear 20 kg/cm2 Charged upto 6.7 mm Charged upto 5.9 mm Sp. Gear 13 kg/cm2 5 kg/ cm2 7.7kg Drain 20 kg 8.8 kg 7.7 kg 20KG/CM2 EGPV ESV IV E/ TRIP Drain Drawn by -- A.D.RASEKAR Cam DIFF 15.4kg TTS

Slide 58: 

MOT MOP CVSM Follow up pilot valve Summation pilot valve Intermediate pilot valve CV-1 Load/Speed control pilot v/v Feedback v/v CVSM Pilot v/v From Diff.8.8 kg/cm2 Sec.sensing oil 10.3 kg/cm2 20 kg/cm2 control oil EGPV charging oil line Oil to ESV/IV 20KG/CM2 20KG/CM2 Prot. oil 20KG/CM2 Drain to mop suction SOP Steam From feedback OPEN OPEN CV-2 HPT CV 1 2 3 4 Speeder gear 20 kg/cm2 Charged upto 6.7 mm Charged upto 5.9 mm Sp. Gear 13 kg/cm2 5 kg/ cm2 7.7kg Drain 20 kg 8.8 kg 7.7 kg 20KG/CM2 EGPV ESV IV E/ TRIP Drain Drawn by -- A.D.RASEKAR Cam DIFF 15.4kg TTS STOP

Slide 59: 

MAIN STEAM AFTER ESV CVSM PISTON CAM SHAFT FULCRUM CAM 0 MM 300 MM 100 MM

PROTECTION SYSTEM : 

PROTECTION SYSTEM PROTECTION SYSTEM FUNCTION SIMILAR TO GOVERNING SYSTEM BY A COMBINATION OF MECHANICAL AND HYDRULIC SIGNALS ON VARIOUSELEMENTS DESCRIBED BELOW: 1)EMERGENCY GOVERNOR 2)EMERGENCY GOVERNOR LEVERS 3)EMERGENCY GOVERNOR INDICATORS

CONT. : 

CONT. EMERGENCY GOVERNOR TESTING COCK 5)EMERGENCY GOVERNOR PILOT VALVE 6)EMERGENCY STOP VALVE SERVOMOTOR 7) INTERCEPTER VALVE SERVOMOTOR 8)TURBINE SHUTDOWN SWITCH

PROTECTION SYSTEM : 

PROTECTION SYSTEM PROTECTION SYSTEM OPERATES AND TRIPS THE SET (COMPLETE CLOSURE OF EMERGENCY STOP VALVES, INTERCEPTER VALVES AND CONTROL VALVES) SPEED RISE UPTO 111 TO 112% SPEED RISE UPTO 114 TO 115% VACUUM BELOW 540 mm Hg

Cont. : 

Cont. 4) LUB OIL PRESSURE BELOW 0.3 atg. 5)MAIN STEAM TEMP.VERY LOW (450 degree) 6)HP HEATERS LEVEL VERY VERY HIGH 7)DRUM LEVEL VERY VERY HIGH 8)AXIAL SHIGT HIGH 9) GEN. TRIP TO TURBINE TRIP

THANK YOU : 

THANK YOU

Slide 89: 

FROM INTERMEDIATE VALVE FROM DIFFERENTIATOR

Slide 95: 

LOAD/SPEED CONTROL PILOT VALVE ESV/IV SOP EGPV CHARGING OIL OIL TO ESV/IV 20 Kg/cm2 control oil 20 Kg/cm2 Protection oil close open TO FOLLOW UP V/V, SUMMATION V/V Speeder gear 2.5 mm Sp/gr upto 6.7mm Load/Speed control pilot valve DRAIN

Slide 99: 

MOT MOP SOP CVSM Follow up pilot valve Summation pilot valve Intermediate pilot valve CV-1

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