General Purpose Steam Turbine Control Application (STCA-GP)

for mechanical drives

Main components• IndustrialPLC• Operatordisplay• PCbasedconfigurationtool• SerialinterfacingtoPCS

Steam Turbine Control Application• Selectionoftwoorthreespeed probes• Automaticfallbackresponseto speedprobefailure

Predictive control response• Configurablesetpointand processvariable• Predictiveresponsetoavoid overspeeduponsuddendriven loadchanges

Open loop response• Increaseavailabilityand operabilityofthedrivenunit whichmayotherwisetripon overspeedduetosuddenload change• Actuatorcontrolresponse dampeninguponcompressor surgedetection

Actuator output• Linearizationofactuatoroutput• Valveactualpositiondeviation alarming(ifpositionfeedbackis available)

Sequencing• Fullautomaticcold,warmand hotstartofturbine• Automaticstartuptimingbased onrunningandshutdowntiming• Automaticwarmuptimingbased oncasingorflangetemperatures• Criticalspeedzoneramping andavoidance• Loadingandunloadingofa compressorinconjunctionwith itscompanionperformanceand antisurgecontrollers

Kabelweg37•1014BA•Amsterdam•TheNetherlandsT+31(0)206376801•F+31(0)206362780•www.control-care.com•info@control-care.com

Control solutions to the Oil & Gas, Chemical and Petrochemical industries world wideThe turbine governor control or Steam Turbine Control Application (STCA-GP) developed by Control-Care enables fully automated speed control during normal operation as well as start-up/shutdown speed control including critical speed avoidance. It provides a versatile and economical way to regulate your steam turbine’s speed, protects the turbine against overspeed damage and automatically sequences startups and shutdowns. The STCA is fully configurable to API611 general purpose steam turbines and is typically integrated into the train control system. This integration results in improved train control system availability and reliability as well as in reduced system cost.

TheentireControl-Careturbineandcompressorcontrolschemecanincludecompressorantisurge(ACA)andperformance(PCA)control,compressorauxiliariessequencing,parametricdiagnosticsandESDsysteminterfacing.

Set point mode selection• Internalsetpoint• Localsetpoint• Remotesetpoint• Cascadesetpoint• Analog,pushbuttons,seriallink

Limiting control• Maintainturbinespeedwithin allowableoperationalrange• Maintainpredefinedprocess variableswithinlimits

Cascade control• Controlofanalternateprocess variableusinganindependent setoftuningparameters

Overspeed prevention• Keepsteamturbinespeedator belowmaximumoperatingspeed usingpredictivecontrolresponseor openloopresponse

Overspeed and acceleration protection• Turbinetripwhentherotorspeedor accelerationexceedsallowablelimit

Calculated variables • Currentspeedindicationbasedon numberofinstalledprobesand functioningprobes

Graphical interfaces• Controlapplicationfaceplate• Controlapplicationconfigurator

User friendly application configurator• Upperscreenprovidesforloop configurationsettings• Lowerscreenshowsdedicated loop’scontributiontooverall output

Control valve testing module• Straightforwardcontrolvalve stroking• Straightforwardcontrolvalve strokeverificationtests• Passwordprotecteduser levelacces

Overspeed testing module• Simpleandautomated procedureforoverspeed validationandtesting,with manualoverridecapability• Passwordprotecteduser levelaccess

Kabelweg37•1014BA•Amsterdam•TheNetherlandsT+31(0)206376801•F+31(0)206362780•www.control-care.com•info@control-care.com

Control solutions to the Oil & Gas, Chemical and Petrochemical industries world wide

Turbine performance deviation alarming• Expectedandactual performancearecompared andalarmedincasediverging

Application control functions are selectable • Customizeeachapplication individuallybyenablingordisabling sitespecificfunctionality (configurationinsteadof programming)

Alarms and events • Timestampedalarmandevent reportingforsignalingand troubleshootingpurposes

Critical event stored on control system platform • Standardtrendingofcritical parameters,[x]minutes*prior and[y]minutes*aftertheevent

Sequence of event history on control system hardware, time stamped • Standard[x]points*history instandalonemode

*)Quantityisconfigurable

General Purpose Steam Turbine Control Application (STCA-GP)

for mechanical drives