ATRS

*PMI Revision 00 *AUTOMATIC TURBINE RUN UP SYSTEM(ATRS)

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Presentation outlineOverview of Plant ControlsFunctions of ATRSStructure of ATRS Program Structure of ATRS and Turbine protection

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**MAN-MACHINE-INTERFACEOPERATORINSTRUMENTATION & CONTROLPLANT

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**POWER PLANT CONTROLUNIT CONTROLBOILERTURBINEGENERATOR

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** MEASUREMENT CLOSE-LOOPCONTROL OPEN-LOOPCONTROL PROTECTION MONITORINGINSTRUMENTATIONANDCONTROL

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*PMI Revision 00 *ADVANTAGES OF AUTOMATIONOPERATING PERSONNEL FREED FROM ROUTINE TASKS.INCORRECT INTERVENTIONS IN THE PROCESS AVOIDED.STRESS ON EQUIPMENT REDUCED.PLANT OPERATIONS GEARED FOR MAXIMUM EFFICIENCY.INCIPIENT FAULTS RECOGNISED QUICKLY.ON FAULT OCCURRENCE, IMMEDIATE AND LOGICAL INTERVENTION POSSIBLE.

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**A. CONTROL SYSTEM: ANALOG (CLOSE LOOP) - ELECTROHYDRAULIC CONTROLLER (EHC) - TURBINE STRESS EVALUATOR (TSE) - LOW PRESSURE BYPASS CONTROLLER (LPBPC) - GLAND STEAM PRESSURE CONTROLLER (GSPC)

BINARY (OPEN LOOP) - AUTOMATIC TURBINE RUN UP SYSTEM (ATRS) - AUTOMATIC TURBINE TESTER (ATT)

B. MONITORING & MEASUREMENT SYSTEM - TURBINE SUPERVISORY INSTRUMENTATION (TSI) - MEASURMENT OF PARAMETERS LIKE, TEMP.,PRESS.,LEVEL etc.

C. PROTECTION SYSTEMTURBINE C&I PACKAGE CONSISTS OF THE FOLLOWING SYSTEMS:

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*PMI Revision 00 *HIERARCHY OF CONTROLUNIT CONTROLGROUP CONTROL(WHEN, HOW MANY,WHICH)SUB-GROUP CONTRL-1SUB-GROUP CONTRL-2CONTROL INTERFACESWITCH GEAR (MCC)

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*PMI Revision 00 *CONCEPT OF C&I IN THERMAL POWER STATIONUNIT CONTROLCLOSED LOOPCONTROLFUNCTIONAL GROUPCONTROLPROT-IVELOGICSDATA PROCESS-ING, ALARMANNUNCIATION SIGNAL CONDITIONINGALALOG, BINARYCONTROL INTERFACEMOTOR CONTROL CENTRESWITCH GEARM

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DRIVESSIGNAL TRANSMITTERANALOG AND BINARY SIGNALSCRT /MMI DISPLAY UNIT IN OWS LOGSCONTROL ROOMAUTOMATIONEQUIPMENTPLANT INTERFACEEQUIPMENTPLANT (FIELD)OPERATOR

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEMTASKS PERFORMED:SWIFT,ACCURATE AND OPTIMUM STARTUP ( INCLUDING SYNCHRONISATION AND LOADING) OF TURBINEMAINTAINING OIL SUPPLYBUILDING UP AND MAINTENANCE OF VACUUM

FEATURES :BASED ON FUNCTIONAL GROUP CONTROL PHILOSOPHYEACH FUNCTIONAL GROUP ORGANISED AND ARRANGED IN SUB-GROUP CONTROL, SUB-LOOP CONTROL, AND CONTROL INTERFACEOPERATING MODES AVAILABLE: - MANUAL MODE ( OPERATOR GUIDE) - AUTOMATIC MODE - STEP BY STEP MODE

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*PMI Revision 00 *ATRS STRUCTURE OIL SYSTEM, VACUUM SYSTEM, TURBINE etc. GCSGCSGCSLCSLCSLCCISGCCI

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*PMI Revision 00 *GROUP CONTROL: Decides WHEN, HOW MANY & WHICH SGC shall be operating and stopped.SUB GROUP CONTROL: Contains the sequential logics for switching drives ON and OFF. Perform sequence in STEPS, issue commands and get Checkbacks.SUB LOOP CONTROL: can be switched ON & OFF manually. Receive commands from GC, SGC and also ManualCONTROL INTERFACE: Standard Interface between the command transmitters and receivers in the plant, undertakes all necessary signal processing and monitoring.SYSTEM OPERATION MODES:AUTOMATIC,SEMI AUTOMATIC,OPERATOR GUIDE

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*PMI Revision 00 *ADVANTAGES OF ATRSELIMINATES HUMAN ERROR PROVIDES MAXIMUM PROTECTION AGAINST MALFUNCTIONSOPERATORS TASK LESS ARDUOUSENABLES SAFE, SMOOTH, STRESS CONSISTANT AND OPTIMUM WARM-UP, ROLLING AND SYNCHRONISATION OF TURBINE IN LEAST POSSIBLE TIMEINCREASES PLANT AVAILABILITYREDUCES STARTING TIME WITHOUT IMPAIRING LIFEMEETS EMERGENCIES AUTOMATICALLYALL PLANT OPERATING CONDITIONS CATERED TO BY CRITERIA DEPENDANT PROGRAMMINGINCREASED OPERATING FLEXIBILITY, SAFETY AND RELIABILITY

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*PMI Revision 00 *ATRSAUTOMATIC TURBINE RUN UP SYSTEMStart up and Shutdown sequence performed in reliable wayProtect drives and related auxiliariesUniform and sequential information to operator about the processDistinct information about the nature and location of faults

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*PMI Revision 00 *STEP 01STEP 02&START DRIVE ADRIVE A ONMONITOR & BLOCKING TIMEMONITOR & BLOCKING TIMEOPEN DMPR A

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEMSUB GROUP CONTROL ( SGC):SGC executes commands to bring the equipment upto a particular defined status. The commands are executed in a predefined sequence in the form of steps. Desired number of criteria act as preconditions before the SGC can take off or execute its defined sequence. The functional group continues to function automatically all the time demanding enabling criteria based on the process requirements and from other FGs, if required. In case the desired criteria is not available, the system would automatically act in such a manner as to ensure the safety of the main equipment.The sequence is programmed in the processor. The process signals are acquired through the input modules and are available on the bus.

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEMWAITING AND MONITORING TIME FOR STEPS: Waiting Time : It implies that the subsequent step will not be executed unless the specified time elapses. If no waiting time is specified, the next step gets executed as soon as the enabling criteria are fulfilled.Monitoring Time : It is the time required for executing the command of any step as well as the time required for appearance of criteria for the next step. Under healthy conditions it should happen within the specified time, otherwise an alarm is initiated. Whenever there is uncertainty regarding the time required for completing a particular task, such as warming-up, pulling vacuum etc., the monitoring time is blocked.

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*PMI Revision 00 *PROGRAM STEP OF A SUBGROUP CONTROL02FROM STEP 1STEP CRITERIA FOR STEP -2BYPASS CRITERIONPROGRAM LOOPWAIT 50sMO TIME 20s COMMAND12&&1& STEP 2 ( START UP PROGRAM) WITH 2 STEP CRITERIA, 2 COMMAND OUTPUTS AND A MONITORING & WAITING TIME . WITH ADDITIONAL PROGRAM LOOP CONTROL AND A BYPASS CRITERIA FOR STEP 1 WAITING OR MO TIME CAN BE PROGRAMMED FOR 0.1 SEC TO 999 MIN. NOS. 1-49 USED FOR START-UP, 51 TO 99 FOR SHUTDOWN PROGRAM.

EXAMPLE

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEMWAITING AND MONITORING TIME FOR STEPS:

ATRS can be switched on at any stage after completing certain tasks manually, if so desired. In such cases, the SGC program quickly scans through the steps and starts executing from the stage upto which the tasks have been completed manually. This is achieved by incorporating suitable overflow /bypass conditions in the logic.

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEMATRS CONTROLS: 1. ATRS is organised in the following four Sub-Groups :Oil supplyEvacuationTurbineHP CONTROL FLUID 2. SGC issues commands either to the SLC or directly to the drive through the Control Interface.

3. Each of these SGCs has its subordinate SLCs and CI modules. These SGCs in conjunction with the turbine governing system , TSE and the auto-synchroniser accomplish the function of start-up of the TG set.

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEMSUB-LOOP CONTROL (SLC) :A SLC, when switched on, actuates the equipment and brings it to the desired status as demanded by the process and there is no sequence logic involved in it.

SLC is like a watch-dog performing an assigned duty.

All mechanical equipment which need to be switched on/off based on process consideration are hooked-up in various SLCs. Standby equipment is also interlocked in SLCs.

SLC can be switched on either manually or through SGC and issues commands to the drive control level.

SLC logic is also realised in the processor module.

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEMCONTROL INTERFACE (CI) :Each remote controlled drive has a dedicated CI module which acts as a standard interface between the transmitters and receivers in the plant and undertakes all necessary signal processing and monitoring.The CI module receives manual commands from the process keyboard/inserts, active protection signals and enabling signals from the protective logic, as well as automatic control commands from the SGC/SLC.It interlocks the input commands according to their priority and validity and then passes actuation signals to the interposing relays in the switch-gear.The status checkbacks received from the switchgear or actuators are monitored, processed and transmitted to VDU/desk tiles, the protective logic and the SGC.

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEMCONTROL INTERFACE (CI) : (Continue--)These modules have the firmware which defines the standard function of the module and its signalisation mode as well as the programmable logic for the drive protection and the permissive interlocks. The drive level automation tasks related to the respective drive is realised through the programmable logic.

The module has hardwired inputs and outputs for connection of feedback signals and commands to the switchgear together with local bus interface for signal exchange via the system bus.

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEMATRS STRUCTURAL SYSTEM:

ATRS IS ORGANISED IN THREE SGCs :

1. SGC-TURBINE : SGC Turbine acts directly on the following systems : Sub-loop Control (SLC) Drains. Warm up Controller. Starting Device of turbine governing system. Speed & Load Setpoint devices of turbine governing system. Auto-synchroniser.

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEMATRS STRUCTURAL SYSTEM:

2. SGC-OIL SUPPLY :

SGC oil supply directly acts on the following system :

Sub-loop control (SLC) turning gear.SLC auxiliary oil pump 1.SLC auxiliary oil pump 2.SLC emergency oil pump.SLC jacking oil pump.

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEMATRS STRUCTURAL SYSTEM:

3. SGC-CONDENSATE & EVACUATION :

SGC- Condensate & Evacuation directly acts on the following systems :

Sub-loop Control (SLC) condensate extraction pumps.Starting ejector, if provided.Main ejectors / vacuum pumps (as applicable).Vacuum breaker.

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEMATRS STRUCTURAL SYSTEM:

3. SGC-HPCF :

SGC- HPCF acts on the foll :

Sub-loop Control (SLC) HPCFSLC HPCF pumpsHPCF pumpsHPCF re-circulation pumpsLPCF temp control valve

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*PMI Revision 00 *AUTOMATIC TURBINE RUN-UP SYSTEM3. SGC-HPCF :Both CF PUMPS GET SWITCHED ONTHRU SLC. IN CASE RUNNING PUMP DOES NOT DEVELOP THE REQUIRED PRESS, THE STANDBY PUMP GETS SWITCHED ONAFTER GETTING THE REQUIRED CF PRESS SLC HEATING IS PUT ON & CF CIRCULATION PUMP WHICH FEEDS THE REGENERATION CKT IS ALSO PUT ON. TEMP CONTOL VLV IS PUT IN AUTO MODE TO REGULATE THE TEMP.CF TEMP IN THE TANK IS MAINTAINED BETWEEN 55 TO 57 C BY SWITCHING ON/OFF THE CF HEATER THRU THE SLC. IN CASE CF TEMP IN HTR EXCEEDS > 65 C THE HEATER IS SWITCHED OFFIN SHUTDOWN PROG ALL THE PUMPS ARE SWITCHED OFF AND SLC IS PUT OFF. SLC HEATING IS KEPT ON TO MAINTAIN THE TEMP REQUIRED FOR THE NEXT STARTUP.

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*PMI Revision 00 *TURBINE START-UP / SHUT-DOWN CONTROL, OVERVIEWSUB-GROUP ( TURBINE START-UP / SHUT-DOWN)SUBLOOP DRAIN VALVESUBLOOPLP-WATERINJECTIONMECHANICALHYDRAULICCONTROL(MHC)ELECTRO-HYDRAULICCONTROL(EHC)SEALSTEAMCONTROL(SSC)TURBINE TRIPSYSTEM(TTS)TURBINE STRESSEVALUATORLP WATERINJECTIONAUTOMATICSYNCHRONIZERDRAIN VALVESGENERATORMAIN CKT.BREAKERTHYRISTORVOLTAGEREGULATOR(TVR)CRITERIACRITERIA

AUTO-ON/OFFAUTO ON/OFFAUTO ON/OFFMANUAL ON/OFFMANUAL ON/OFFMANUAL OPEN/CLOSE

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*PMI Revision 00 *SGC-DISPLAY4 6 8 7 51321. PUSHBUTTON SHUTDOWN2.PUSHBUTTON STARTUP OR OPERATION3.PUSHBUTTON AUTOMATIC ON/OFF4.LAMP SHUTDOWN PROGRAM5.LAMP STARTUP OR OPERATION PROGRAM6.LAMP AUTOMATIC OFF7.LAMP AUTOMATIC ON8.LAMP FAULT

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*PMI Revision 00 *SLC-DISPLAY 2 3 4

1. PUSHBUTTON MANUAL ON/OFF2.LAMP SLC OFF3.LAMP FAULT4.LAMP SLC ON

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*PMI Revision 00 *DRIVE INTERFACE-DISPLAY 3 4 5

1. PUSHBUTTON OFF (CLOSE)2. PUSHBUTTON ON (OPEN)3. LAMP OFF (CLOSE)4. LAMP FAULT5. LAMP ON (OPEN)

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*PMI Revision 00 *EXPLANATION OF KWU IDENTIFICATION SYSTEM (KKS)0123ANAAANNAANNNAANNA1MAJ15AP001XB01ORDINAL SECTIONGENERAL EXAMPLESIGNAL IDENTIFICATIONCONSECUTIVE NO. OF EQUIPMENTTYPE OF EQUIPMENTNO. OF SUBGROUPPLANT GROUP (FUNCTIONAL GROUP)NO. OF UNIT

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PROTECTION SYSTEMFOR STEAM TURBINE

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*PMI Revision 00 *TURBINE PROTECTION SYSTEMTASK PERFORMED :

PROTECTS TURBOSET FROM INADMISSIBLE OPERATING CONDITIONS

PREVENTS DAMAGE IN CASE OF PLANT FAILURE

FAILURE OCCURRENCE REDUCED TO MINIMUM

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*PMI Revision 00 *TURBINE PROTECTION SYSTEMADVANTAGES :

DETECTION OF UNIT IRREGULARITIES

PREVENTION OF UNIT OVERSTRESSING DUE TO TRIPS

RELIEF OF OPERATING PERSONNEL FROM QUICK AND CORRECT DECISION TAKING

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*PMI Revision 00 *TURBINE PROTECTION SYSTEMHYDRAULICTRIP SYSTEMELECTRICALTRIP SYSTEMEXTENDEDTURBINE PROT.PROT. CRITERIAFROM OTHER AREA

- OVER SPEED TRIP DEVICE 1/2- VACUUM TRIP DEVICE- HAND TRIP LEVER(LOCAL) 1/2

- MANUAL REMOTE TRIP ( UCB)- LOW VACUUM TRIP- LOW LUBE OIL - FIRE PROT. TRIP-BRG METAL TEMP-AXIAL SHIFT-HP/IP TOP/BOTDIFF TEMP HI

- LP EXH. STM. TEMP. > MAX

-GENERATOR PROTECTION

- MASTER FUEL TRIP RELAY ENERGISED

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*PMI Revision 00 *TURBINE PROTECTION SYSTEMGENERAL :

The electrical trip system comprises of two identical and independent relay based trip channels viz. electrical trip channels 1 & 2.Both channels are connected to different (two) trip solenoid valves.All command signals for turbine trip are hooked up with both the channels.Actuation of any of the channels energises the respective trip solenoid which in turn trips the turbine. Each channel is realized in a local bus. Both the local buses are completely independent of each other and input modules, processor module and output modules reside on each.

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*PMI Revision 00 *TURBINE PROTECTION SYSTEMGENERAL :Trip signals from the sensors / field instruments are conditioned and distributed to both the channels (local buses) via hardwired modules.

Realisation of 2 out of 3 trip logic is carried out in the local bus. On detection of a fault in any one of the input signals to a channel, the configuration for that channel changes from 2 out of 3 to 1 out of 2 and is annunciated. Further failure in a channel changes the configuration to 1 out of 1.

Trip signal from each of the local buses acts on 3 relays in 2 out of 3 combination.

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*PMI Revision 00 *TURBINE PROTECTION SYSTEMCYCLIC TEST :Both the channels are tested periodically, even while the turbine is running.

Cyclic testing is done automatically at preset intervals and can be blocked from the protection cabinet, if desired.

This testing can also be initiated manually from the cabinet.

Only one channel can be tested at a time. Online testing is done by simulating the trip signals and it determines faults in the input modules, processor modules, output modules or the trip relays.

These faults can be acknowledged from the cabinet. Next cycle test can only be carried out after acknowledging the fault.

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*PMI Revision 00 *TURBINE PROTECTION SYSTEM

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*PMI Revision 00 *TURBINE PROTECTION SYSTEMTRIPPING CRITERIA :

1. CONDENSER VACUUM VERY LOW : This is a back up protection to the hydraulic low vacuum trip device. The protection acts if absolute pressure in the condenser rises above 0.3 Kg/cm2 (abs).

2. LUBE OIL PRESSURE LOW : The protection acts if the lube oil pressure before thrust bearing decreases to 1.2Kg/cm2 . The trip signal is initiated by three pressure transmitters in 2-out-of-3- logic.

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*PMI Revision 00 *TURBINE PROTECTION SYSTEMTRIPPING CRITERIA :

3. FIRE PROTECTION : The protection acts in the event of any of the following conditions :i) Fire protection switch, either in unit control room or in machine hall, operated.ii) Level in main oil tank falls to a very low value, indicating substantial leakage of oil from the system. The command signal under condition (ii) is initiated from three level transmitters in 2-out-of-3 logic cofiguration.

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*PMI Revision 00 *TURBINE PROTECTION SYSTEMTRIPPING CRITERIA :

4. HP EXHAUST STEAM TEMPERATURE HIGH :

The HP exhaust steam temperature protection circuit causes the exhaust sections of the turbine, the blading and the extraction points against overheating. Under extreme operating conditions the HP turbine can be run at low flow rate and simultaneous relatively high back pressure. This prevents the steam from expanding, which causes the exhaust steam temperature to rise ( > 5000C). The temperature is measured by means of three thermocouples and protection criteria is derived in 2 out of 3 logic.

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*PMI Revision 00 *TURBINE PROTECTION SYSTEMTRIPPING CRITERIA :

5. TURBINE TRIP SWITCH OPERATED :

The protection acts when the turbine trip switch in unit control room is operated manually.

6. TRIP COMMAND INITIATED FROM ATRS :

The protection acts when the trip command signal is initiated from the Automatic Turbine Run-up System .

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*PMI Revision 00 *TURBINE PROTECTION SYSTEMTRIPPING CRITERIA :

7. GEN. PROTECTION OR MFT- RELAY ENERGISED :In the event of generator faults under Class-B trip both the turbine trip channels are actuated to trip the turbine. In such a case the generator protection acts through Reverse Power Relays. In the event of generator faults under Class-A trip or in the event of boiler "Master fuel trip relay" energised, command signal for turbine trip shall act simultaneously and independent of other equipment trip out sequence.

8. OPERATION OF REVERSE POWER RELAY :The command signal is initiated with a time delay of 10 seconds after any of the two reverse power relays have operated.

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*PMI Revision 00 *THANK YOU

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