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  • Users: jan63
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  1. jan63

    Restriction in flow of Penstock

    I have attached layout of Penstock for informationhttps://files.engineering.com/getfile.aspx?folder=df99ea74-ceeb-401d-bd96-fcf06328cbca&file=Penstock_arrangement.rar
  2. jan63

    Restriction in flow of Penstock

    Four turbines and four relief valves.But scheme is that if flow exceeds 60000 cfs,one unit will trip to keep discharge below 60000 cfs.So my question still is the velocity in penstock a factor
  3. jan63

    Restriction in flow of Penstock

    Working in a hydel power station.head is 430 ft.We had an irrigation tunnel.The flow of the tunnel was through outlet gates and with full head and full opening the discharge capability was 90000 cusecs. After some years it was decided to have a power house on the tunnel.so penstock was built and...
  4. jan63

    Auxiliary Consumption and limits

    The topic of recent discussion in our Power system is the auxiliary consumption. In our power stations meters are installed at generator terminals,at source of Auxiliary for power station and at exit points for power evacuation i.e transmission line. Our Audit party says that the difference...
  5. jan63

    Irregular bending of 500KV switchyard tubular bus

    Thank you all for the replies.With all this I will be in a better position to tackle the issue
  6. jan63

    Irregular bending of 500KV switchyard tubular bus

    Agreed but we have to reply or knock him out technically.His plea is "its working"
  7. jan63

    Irregular bending of 500KV switchyard tubular bus

    am working in a power station recently commissioned.It has a 500KV switchyard which is an extension of the existing one.Now attached pictures show quality of installation.We are pressing on the contractor that the irregular bending of the bus bar is not onle aesthetically bad but also the...
  8. jan63

    Bus bar differential protection

    Working in a power station where the switchyard is 500KV.The bus bar is in two section with a tie breaker/bus sectionalizer inbetween. Presently the bus bar has high impedence bus bar differential protection with zone I covering one half of the bus and zone II covering second half. In an...
  9. jan63

    sudden short circuit test

    The sudden short circuit tests are performed to determine transient and sub transient characteristics of a generator. How important is the voltage level.What i want to ask is what difference will it make to perform test at 50% or 80% or 105% of the rated voltage.Higher the voltage higher will be...
  10. jan63

    Fault levels

    Ok thank you all. As fas as bus bar arrangement is concerned we have 220kV and 500kV bus bar interconnected through auto transformers.Breakers are in breaker and a half scheme. We are replacing the 220kV breakers,CT's,Disconnecctors and bus bar but the foundations have been checked and will be...
  11. jan63

    Fault levels

    Ok thanks.That is what I thought
  12. jan63

    Fault levels

    I am working in power station where the switchyard was built in 1977. Due to expanding network the new fault level calculated over the next few years is 63 kA(old 30 kA). We have started replacement of equipment like breakers,disconnect,lightning arrestors etc. The question is do we need to...
  13. jan63

    Effects of overloading on life of generators

    I am working in an hydro-electric power plant where units were installed from 1977 to 1984.At time of installation the manufacturer specifications allowed 15% overloading and accordingly units were overloaded over the past 30 to 35 years. Now we are facing problems in exciters and windings...
  14. jan63

    Stator Winding

    in short term if we apply proper insulation at the effected area will it work
  15. jan63

    Stator Winding

    no such work nearby.And the deposits are not on all bars.It can be seen on some and not all.Also trend is that there are deposits on four then eight are clear.
  16. jan63

    Stator Winding

    I am working in a power station.The generators installed here are of 175MW capacity and installed in 1982.Recently we faced a problem.There is a whitish powdered deposit on the stator bars just at the entrance to the slot.I am attaching pictures.Can any one suggest the reason and what remedy...
  17. jan63

    loading of 500kv transmission line

    We have 500 kv transmission line which have four conductors per phase each can carry 900 amp.But still loading of lines is limited to about 1100 MW due to characteristic impedence of line.What will happen if load on lines is more than 1500 MW
  18. jan63

    tunnel filling

    thank you.I agree with the advice.At 150psi pressure plugging of line will be with risks.
  19. jan63

    tunnel filling

    i am attaching drawing of tunnel.please advice after seeing it.I think air will remain trapped if we block ithttp://files.engineering.com/getfile.aspx?folder=35b019b1-9b43-4ea1-8b9f-8e33ddd3ecd9&file=Tunnel.doc
  20. jan63

    tunnel filling

    We have a 36 feet diameter tunnel supplying water to four turbines.The rated head of the units is 384 feet.Now from where the penstock of the units start the tunnel diameter has been increased.Thus we have four areas where tunnel diameter is more.On top of these four areas are air release lines...

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