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AUTOMATIC TURBINE TESTER

BY

ASHUTOSH DWIVEDI

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SALIENT FEATURES OF ATT

INDIVIDUAL TESTING OF EACH PROTECTIVEDEVICE AND STOP AND CONTROL V/V.

PROTECTION OF TURBINE DURING ATT ISPROVIDED BY SPECIAL TEST PROTECTIVE

DEVICES. AUTOMATIC FUNCTONAL PRETESTING OF

SUBSTITUTE DEVICES THAT PROTECTTURBINE DURING TESTING.

MONITORING OF ALL PROGRAM STEPS FOREXECUTION WITHIN A PREDEFINED TIME.

INTERUPTION IF RUNNING TIME EXCEEDEDOR ACTUAL TRIP INITIATED.

AUTO RESET OF TEST PROGRAM AFTER A

FAULT.

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AUTOMATIC TURBINE TESTER

HEALTHINESS OF FOLLOWING COMPONENTS ARE

CHECKED ONLINE (WITHOUT TRIPPING OF TURBINE)

PROTECTION DEVICES

- FUNCTIONING OF REMOTE TRIP SOLENOID- FUNCTIONING OF OVERSPEED TRIP FLYBOLTS

- FUNCTIONING OF HYDRUALIC LOW VACUUM TRIP

TURBINE STOP & CONTROL VALVE

- OPERATION OF ALL HP / IP STOP VALVES

- FREE MOVEMENT OF ALL HP / IP CONTROL VALVES

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TESTING OF PROTECTION DEVICES

RTS 1 /2

O/S TRIP

LOW VACCUM

SEQUENCE OF OPERATION

SELECT SUB GROUP

SELECT SAFTY DEVICE

TEST PROG ON

PRETEST STARTS

PRETEST COMPLETE

MAIN TEST ON

MAIN TEST COMPLETE

RESETTING PROG ON

RESETTING COMPLETE

TEST COMPLETE

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C/O VALVE

& TEST SOL

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PRETEST

TEST SOLENOIDS ENERGISE( OPEN)

PRESSURE BEFORE CHANGEOVER V/V > 5 Ksc

TEST SOLs DE ENERGISE (CLOSE)

PR BEFORE CHANGEOVER V/V & BETWEEN TESTSOLs < 2 Ksc

TEST SOLs ENERGISE

PR BEFORE CHANGEOVER V/V > 5 Ksc

OPERATING SOL OF CHANGEOVER V/V ENERGISE CHANGEOVER V/V MOVES TO TEST POSITION

ALTERNATE SUPPLY OF TRIP OIL ESTABLISHED

FROM CONTROL FLUID

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RESET SOL

O/S TRIP DEVICE

O/S TRIP

TESTER

RTS

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MAIN TEST

REMOTE TRIP SOLENOID 1 /2

RTS 1 OR 2 ENERGISE

AUX TRIP OIL DRAINS MAIN TRIP V/V TO TRIP POSITION

TRIP OIL BEFORE CHANGEOVER V/V DRAINS

TEST COMPLETE

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MAIN TEST

OVERSPEED TRIP DEVICE O/S TEST MOTOR ON

TEST OIL PRESSURE BUILDS UP

O/S BOLTS 1 & 2 OPERATE

AUX TRIP OIL DRAINS

MAIN TRIP V/V TO TRIP POSITION

TRIP OIL BEFORE CHANGEOVER V/V DRAINS

TEST COMPLETE

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LOW

VACUUM

TRIP

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MAIN TEST

LOW VACCUM TRIP DEVICE LOW V/C TEST SOL ENERGISE

V/C ABOVE DIAPHRAGM FALLS

MAIN PILOT MOVES DOWN

SECOND PILOT MOVES DOWN

AUX TRIP OIL DRAINS

MAIN TRIP V/V TO TRIP POSITION

TRIP OIL BEFORE CHANGEOVER V/V DRAINS

TEST COMPLETE

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RESETTING PROGRAMME RTS/ LOW VAC SOL DEENERGISE/OVERSPEED MOTOR REVERSES

TO OPERATING POSITION

RESET SOLs ENERGISE

AUX STARTUP OIL BUILDS UP (FROM CONTROL FLUID)

MAIN TRIP V/V & O/S TRIP DEVICE RESET

AUX TRIP OIL & TRIP OIL BUILD UP

RESET SOLs DEENERGISE AUX START UP COLLAPSE

OPERATING SOL OF CHANGEOVER V/V DEENERGISE

CHANGEOVER V/V MOVES TO OPERATING POSITION

TRIP OIL CIRCUIT ESTABLISHES THROUGH MAIN TRIP V/V

TEST SOLs DEENERGISE

RESETTING COMPLETE

TEST COMPLETE

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TESTING

OF

STOP AND CONTROL VALVE

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CHANGE

OVER V/V

AND TEST

& RESETSOL

ATT

MOT

OR

TT T T /

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ATT OF STOP AND CONTROL V/VSEQUENCE OF OPERATION

ATT MOTOR OF CONTROL V/V STARTS

CONTROL V/V SLOWLY CLOSES FULLY

ATT MOTOR STOP WITH SLIGHT OVERTRAVEL TEST SOL OF STOP V/V ENERGISE

SLIDE V/V OF TEST V/V MOVES TO UPPER POSITION

TRIP OIL BELOW PISTON CONNECTED TO DRAIN

STOP V/V CLOSE

RESET SOL ENERGISE

TRIP OIL IS ADMITTED ABOVE PISTON

SPRING IS TIGHTEND

TEST SOL DE-ENERGISE

RESET SOL DE-ENERGISE

STOP V/V OPENS SLOWLY TO 100%

ATT MOTOR OF CONTROL V/V ROTATES IN REVERSE DIRECTION

CONTROL V/V OPENS SLOWLY TO NORMAL POSITION

ATT MOTOR STOPS AFTER SLIGHT OVER TRAVEL

TEST COMPLETE

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