Usually in our country mostly the power plants are being operated or being run via steam turbines i.e too much costly. Only two of our major turbines are being run over hydal or water turbine that's the cheapest and easiest source of generating power but due to the lack of management we are bound to run our power plants over steam mostly.
Even though there is lack in those steam dependent power plants, including the improper usage of waste coal, that can further be used to fabricate cement and less attention towards the structure of power plant.
In Pakistan mostly the alternator used to generate the power is, usually a Japanese fabricated alternator with a capacity around 30,000 KVA . When the pressurized steam is being hit the propellers of a turbine, it takes enough time for that turbine to achieve its rated speed, further when this rated speed is achieved, the coupled alternator also moves along with the turbine to generate the rated power i.e 250 MVA .
We can say that this alternator's output voltages are around 15.8 KV ,which are stepped up via main transformer with a rating of 250 MVA too , this 15.7 KV is stepped up to 220 KV and then being sent to the yard towards the national grid all over the country.
Another part of this 15.8 KV is stepped down via auxiliary transformer with a rating of 25 MVA, this 15.8 KV is stepped down to 6.6 KV for the purpose of operating C.W pumps (Condensate water pumps). Further this 6.6 KV is stepped down to 0.4 KV for the purpose of operating lights and other small rated pumps and etc for the power plant.
The power being transferred to our homes is the one coming via national grid i.e 220 KV, which is stepped down in grid station and then again stepped down via PMT's (pole mounted transformers) in our streets and then supplied to our homes.
Even though there is lack in those steam dependent power plants, including the improper usage of waste coal, that can further be used to fabricate cement and less attention towards the structure of power plant.
In Pakistan mostly the alternator used to generate the power is, usually a Japanese fabricated alternator with a capacity around 30,000 KVA . When the pressurized steam is being hit the propellers of a turbine, it takes enough time for that turbine to achieve its rated speed, further when this rated speed is achieved, the coupled alternator also moves along with the turbine to generate the rated power i.e 250 MVA .
We can say that this alternator's output voltages are around 15.8 KV ,which are stepped up via main transformer with a rating of 250 MVA too , this 15.7 KV is stepped up to 220 KV and then being sent to the yard towards the national grid all over the country.
Another part of this 15.8 KV is stepped down via auxiliary transformer with a rating of 25 MVA, this 15.8 KV is stepped down to 6.6 KV for the purpose of operating C.W pumps (Condensate water pumps). Further this 6.6 KV is stepped down to 0.4 KV for the purpose of operating lights and other small rated pumps and etc for the power plant.
The power being transferred to our homes is the one coming via national grid i.e 220 KV, which is stepped down in grid station and then again stepped down via PMT's (pole mounted transformers) in our streets and then supplied to our homes.
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