Recent content by rangacharya

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    Increasing Power in Synchronous Generator

    Even though the post i very old, I am commenting now. The reply to the question is very well explained even understandable to a lay man. I am following posts of CSA and always notices very good replies to all the queries. In continuation to the above question, I have one more query in...
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    15 MW Generator in Island Mode Trips on Dead Machine Protection

    15 MW STG tripped due to Dead Machine Protection two times while running in island condition. Over current alarm also appeared in Generator Brkr in both the occurrence indicating some problem in the down stream connecting loads. We have checked the SOEs and all other alarms logs but nothing can...
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    Steam Turbine Gear Box

    Dear All, Recently we have carried out 15 MW STG set major overhauling and gear box. In gear box we have not changed any parts, but we only checked the bearing clearances, teet contact and back lash. The high speed (7700 RPM) bearing clearance was found on higher side i.e. 0.53mm, however...
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    Isolated Generator and Droop Governor

    It is a really very elaborative response from CSA and i believe this subject is very close to his heart and same is with me also. Here i want to share my experience, we have 3 generators sets running in parallel without connected to grid. These turbines are operating in droop speed mode...
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    To remove the steam turbine tripping from Trip Oil

    The logic of the process people is correct. however i am not able to understand why only this pressure switch is mal functioning (I hope this tripping also is with 2/3 logic if not better provide for more reliability), as there are various pressure switches installed in trip logic. First we need...
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    Woodward 505 Governor did not switch over during grid failure

    Dear Amit, The normal phenomenon is when you are parallel with grid the unit will be operated in load control mode and whenever grid fails, the tie breaker signal to WWG will open causing unit to get islanded. The islanding means the unit will switch from load control mode to frequency...
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    Load Fluctuation on Steam Turbine Generators

    What happened to the problem? whether it is solved any clue you got. please mention the forum for latest development so that thread gets closed.
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    Load Fluctuation on Steam Turbine Generators

    Looking in to the trends especially of control oil pressure, there should not be so much fluctauations, whether you have accumaltor in the oil circuit with nitrogen filled bladder, if yes kindly check the pre charge pressure of nitrogen. I will post my further observation after studying the...
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    Load Fluctuation on Steam Turbine Generators

    The question put by CSA is very relevant, i.e. the load condition of GTs during load fluctuations in STs, i beleive there will be similar load fluctuations in GTs also as all the M/c are in parallel. I have not worked on GTs, however i have experiance in STs with Woodward Governor control, the...
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    CFBC Boiler Erosion

    We are facing frequent water wall tube failure in CFBC boiler at Kick of zone, i.e. 500 mm above refractory zone in combuster. whether any body have come across this problem, could any body elaborate the mechanism? how the erosion in this area happens? and any successful remedial actions except...
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    Steel chimney corrosion issue

    Dear All, There is a common problem in captive power plants w.r.t. steel chimney corrosion issue especially at the top portion. is there any thread discussed about this problem or can this be a new thread? I welcome various ideas highlighting the causes of the corrosion and remedial actions...
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    Load shedding

    Very Interesting topic is going on. I tried to down load the load shedding scheme through web site as mentioned but i am unable to down load the same can you help. Rangacharya
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    TG LOAD HUNTING AND REVERSE POWER

    Dear SKG, I have few questions for your problem, 1) I hope the generator you are mentioning is STG set. 2) If it is STG set whether the machine is equipped with Woodward governor 3) If operating with woodward governor what mode operation you are adopting i.e. load mode or speed mode...
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    Coal Measurement in Power Plant

    Can any one tell the standard norm followed in declaring coal consumption in AFBC and CFBC boiler where there is no measuring system like weigh feeder in boilers are present.
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    Steam turbine governor control swing

    Dear Pichet, In my earlier reply sticky operation of governor valve was also one of the reason for hunting, i think by operating the valve in shut down you have smoothed its operation and this could have solved your problem. Any way this forum is helping many people to understand various...
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