why need 3 element system in power plant?
if it is not there then what l happen?

Answer Posted / ajeet pal singh

As steam flow and feed water flow effects the level of
boiler drum these two are taken as two elements in three
element control system to achieve smooth control on drum
level ideally these two are capable to maintain the drum
level but the third element as drum level actual itself is
taken to compensate various leakages etc. As we know the
controller doesn't respond unless it senses some error
between PV and SV and if drum level actual is taken alone to
control the drum level, controller will respond only if
level goes up or down to its set point and this will
maintain always a pulsating drum level instead of a straight
line. Steam flow and feed water flow consideration gives a
feed forward effect to controller hence a smooth control on
drum level can be achieved

Is This Answer Correct ?    1 Yes 0 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

what is easiest way to read STL language in PLC?

2753


please send me the inteview questions in IOCL

1851


I need to know steps to Calibration Valve Guard......

1076


Which is your favourite subject & explain any one topic of it.

9133


when the instrument tapping on pipe line is located below and transmitter is located above the tapping point for liquid service transmitter, what should we do, is there any additional drain valve is required??

1813






Hook up resistance decade box to temp.transmitter.

1800


what happen if i increase height of displacer type LT.accuracy or sensitivity are affected.why?

2163


what is the difference between active & reactive power?

1741


what is basic difference between motion balance and force balance in pneumatic instrument?

9059


How INtools is useful for routine Instrument maintenance?

1666


what is the input to be given in digital flow meter during the the calibration time?

1841


Somebody tell me in what way i need to prepare for csio pgrpe(adv instrum eng)interview?what all the quest can i expect?

2232


Pl send the model question paper of mahagenco account officer post

2359


Why even multiple power supplu r used in instrumentation system?

4309


May I have a brief note above the voltage barriers? Whats is the purpose? Please mail me if you've operational details, mail id: rajkumar.diice@gmail.com

1727