Recent content by jan63

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

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

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...

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...

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

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

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...

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...

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...

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...

Ok thanks.That is what I thought

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...

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...

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

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.