TURBINE GATE VALVE GEARING(TURNING GEAR)

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HYDRAULIC TURNING GEAR

HYDRAULIC TURNING GEAR IS LOCATED IN THE BEARING PEDESTAL BETWEEN IP AND LP

TURBINE.TG SHAFT SYSTEM ROTATED BY A DOUBLE ROW BLADE WHEEL, WHICH IS DRIVEN BY

OIL SUPPLIED BY AOP.OIL FROM AOP FLOWS THROUGH A GATE VALVE GEARING AND A NOZZLE

BOX.

LOGICS: PERMISSIVES: (FOR OPENING GVG)

1. DIFFERENTIAL PRESSURE BETWEEN GENERATOR SEAL OIL AND HYDROGEN SHOULD BE > 0.9

KSC (SENSED BY PS MKW 01 CP 003)

2. GENERATOR SEAL OIL PRESSURE-TURBINE SIDE- SHOULD BE > 3.8 KSC (SENSED BY PS-MKW

01 CP 001)

3. GENERATOR SEAL OIL PRESSURE-EXCITATION SIDE- SHOULD BE > 3.8 KSC (SENSED BY PS-

MKW 01 CP 002)

4. TURBINE SPEED SHOULD BE > 15 RPM (SENSED BY MYA 01 FS 001)

5. LUB OIL PRESSURE BEFORE THRUST BEARING IS > 1.2 KSC

GATE VALVE GEARING WILL OPEN ON AUTO WHEN TG SPEED < 200 RPM AND CLOSES ON AUTO

WHEN TG SPEED > 250RPM

GATE VALVE GEARING WILL CLOSE ON PROTECTION WHEN THE LUB OIL PRESSURE BEFORE

THRUST BEARING IS < 1.2 KSC

SLC OF GATE VALVE GEARING WILL GET SWITCHED OFF AND GETS PROTECTION CLOSED WHENFIRE PROTECTION-II IS OPERATED

ALARMS:

SLC TURNING GEAR NOT ON WILL APPEAR WHEN SLC GATE VALVE GEARING IS OFF AND HP

CASING TOP 50% METAL TEMPERATURE IS > 120 DEG

GATE VALVE GEARING NOT CLOSED WILL APPEAR WHEN THE TG SPEED > 540RPM AND GVG IS

NOT CLOSED

JOP LOGICS:

AUTO STARTING OF JOP:

WHEN SLC OF JOP: 1 IS ON AND THE TURBINE SPEED < 510 RPM, JOP: 1 WILL COME INTO

SERVICE

WHEN LUB OIL PRESSURE AFTER THRUST BEARING IS < 1.2 KSC


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WHEN SLC OF JOP: 2 IS ON, JOP: 2 WILL COME INTO SERVICE AND ALSO JOP: 1 & ITS SLC IS

SWITCHED OFF IF,

A. TG SPEED IS < 510 RPM AND JOP HEADER PRESSURE IS LESS THAN 100 KSC (SENSED BY PS-

MAV 35 CP 001) (OR)

B. TG SPEED IS < 510 RPM AND JOP:1 TRIPS ELECTRICAL INTERLOCK (OR)

C. FIRE PROTECTION II IS OPERATED

AUTO STOPPING OF JOP:

JOP: 1 SWITCHED OFF IF, TG SPEED > 540 RPM (OR)

JOP: 2 STARTS ON LOGIC (OR) FIRE PROTECTION II IS OPERATED

JOP: 2 WILL NOT GET STOPPED AUTOMATICALLY.

FIRE PROTECTION:

FIRE PROTECTION II IS OPERATED,

JOP 2 WILL COME INTO SERVICE ON PROTECTION,

JOP 1 IS STOPPED AND

SLCS OF BOTH JOPS ARE SWITCHED OFF

ALARMS:

SLC JACKING SYSTEM NOT ON ALARM APPEARS WHEN SLC OF JOP:1 IS OFF (OR) SLC OF JOP:2

IS OFF AND WHEN THE TG SPEED > 15 RPM

JACKING OIL PRESSURE LOW ALARM APPEARS WHEN JACKING OIL HEADER PRESSURE DROPS

< 100 KSC (SENSED BY MAV 35 CP 011)

TECHNICAL DATA

JACKING OIL PUMP: TYPE: SDF 40-R54/CAPACITY: 1.26DM3/SEC /DISCHARGE PRESS: 120 BAR

JOP MOTOR: 415V/ 30 KW / 57 A / SIEMENS MANUFACTURED.


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PURPOSE OF

MAIN OIL PUMP & AOP : SUPPLY OF LUBRICATION TO ALL BEARINGS, GOVERNING

RACK,

BARRING GEAR, LP B/P RACK AND VACUUM BREAKER VALVE

DC EOP : SUPPLY OF LUBRICATION TO ALL BEARINGS

JOP : JACKING OIL FOR ALL BEARINGS


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CONTROL OIL: OIL AFTER SHUT-OFF VALVE USED FOR GOVERNING RACK, LP B/VACUUM BREAKERVALVE, TO GENERATE PRIMARY OIL AND TO ACTUATE ALL TURB

CONTROL VALVES

TRIP OIL: DEVELOPS FROM CONTROL OIL AFTER RESETTING TURBINE.

USED FOR OPENING AND CLOSING OF ALL TURBINE STOPVALVES, AND TO GENERATE SECONDARY OILS. TURBINE

TRIPPED ALARM IS TAKEN FROM THE TRIP OIL PRESSURE

SWITCH

AUX-TRIP OIL: WHENEVER HYDRAULIC PROTECTION DEVICES LIKE OVER SPEEDCONDENSER VACUUM

AND AXIAL SHIFT DEVICES ACTS, THIS AUX TRIP OIL GETS KILLE

TRIP OILTO DRAIN AT MAIN TRIP VALVE AND TURBINE TO TRIP.

START-UP OIL: GENERATES FROM CONTROL OIL WHEN STARTING DEVICE IS BRMINIMUM POSITION

AUX START UP GENERATES FROM CONTROL OIL ALONG WITH START-UP OIL. TH

START UP OILGENERATES TRIP OIL AND AUX TRIP OIL. THIS OIL RESETS ALL H

PROTECTIONDEVICES.

DRAIN OIL: RETURN OIL FROM ALL BEARINGS, DEVICES AND GOVERNING RA

TEST OIL: GENERATED MANUALLY FOR ACTUATING THE OVER SPEED TEST

AUX SECONDA IS THE OUTPUT OF BOTH STARTING DEVICE AND

SPEEDER GEAR. THIS OIL IS THE INPUT SIGNAL FOR MHG

SECONDARY OI IS THE OUTPUT OF MHG/EHC (SOURCE: TRIP OIL) HP SEC. OILIS THE SIGNAL OIL FOR OPEN/CLOSE OF HPCV. IP SEC. OIL IS

THE SIGNAL OIL FOR OPEN/CLOSE OF IPCV

PRIMARY OIL: DEVELOPS FROM MAIN OIL PUMP SHAFT. THIS OIL PRESSURE ISUSED AS SPEEDFEEDBACK IN SPEEDER GEAR, IN HYDRAULIC CONDENSER

PROTECTION FOR

CUTTING IN/OUT THE PROTECTION DEVICE.


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TURBINE GATE VALVE GEARING(TURNING GEAR)