Slide 1
ALOK SINGHVII Sem ,EIC
Based on Industrial Training at NTPC,BadarpurPresentation
Distributed Digital Control Monitoring & Information System
Distributed Digital Control Monitoring & Information System
(DDCMIS)Consists of Closed Loop Control System (CLCS), open Loop
Control System (OLCS) Man Machine Interface and Plant Information
System (MMIPIS), Measurement System.Sequence of Events Recording
System (SERS) Slave Clock
BASIC FEATURESCRT's100% Interchangeable CRT'sAny function can be
performed on any CRT Complete control, monitoring, supervisory and
display functions Displays bar graph group displays system alarms
real time trend
Types of Control Schemes Closed Loop Control System (CLCS) Open
Loop Control System (OLCS)
Hardware for CLCS and OLCS are separate and independent of each
other
Computerised Data Acquisition System (DAS)
Main purpose - acquire sensor data and to produce displays and
hard copies .
Combines special hardware and software
Facilitates interfacing between plant and operator
Performs plant performance calculations and process
monitoring.
BLOCK DIAGRAM OF DAS
RecorderPrinter,Display,Meter,Magnetic Tapes,Computer
Objectives of DASMonitor process operation to maintain on line
safe operation. Enhance plant life by helping identifying problem
areas. Increase eficiency of operation. Increase the reliability
and availability of the process. Provide proper historical records
Provide plant performance figuresProvide facility for easy
monitoring and proper tuning of automatic controls.
BLOCK DIAGRAM OF TYPICAL DAS CONTROL ROOM
DAS- AdvantagesData acquired -lower cost & with less complex
instrument
Advantages : Data acquisition , etc. at higher speeds with
greater precision. Data generated is selective and arranged to
facilitate further processing.Reliability of data is improved.
Various Data LoggingTurbine Run on log Boiler start up log
Hourly log Turbine and generator diagnostic log Post trip analysis
log Maintenance log Turbine shut down analysis logPerformance
log
plant
engineeringworkstationoperatorworkstationdata
loggercontrollercontrollercontrollercontroller
field busplant bus
Thank You
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