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...
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...
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...
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...
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
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...
I have bought a toyota premio car with automatic gears.I want to know if the car can be started when the battery is down.Normal gear cars can be started by pushing and the switch on.What do we do with these cars
I am giving data about the 500 KV transmission lines of our power station.Going by the current carrying capacity we can further load the lines.But is the conductor the only consideration.We are adding 960 MW to our station.Will present lines carry the additional load
Conductor capacity No.of...
A couple of days back one of our generator tripped on generator differential protection and smoke started coming from it.The CO2 did not operat on auto so it was manually released.Also the transformer diiferential protection operated resulting in spray on trf.
Inspection revealed 60 to 70 bars...
I want to draw operating curves for gen which will determine the max out put f the gen keeping in view the temperatures f stator and rotor and also the satbility limit of the gen is not crossed.Can some one give me an easy way as the books description is a lengthy one
I am working in a power station.I have a simple but important question.The generators here are rated at 175MW with normal current of 7.7KA.The manufacture has allowed 15% overloading and mentioned current at that to be 8.86KA with 80 degree rise above ambient.The question is this that if...
