This video clarify the misconception behind the voltage levels in India.

Faculty Name: Thotakura NSC Sekhar

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FAQs

Q). Then why the transformer voltages are rated at 11kV/440V or 33kV/11kV and so on and also on the board of any substation are written as 33kV/11kV Substation etc... Why?

A) if the line is operating at no load then there will not be any voltage drop hence we will get full 110% voltage so the transformers must be rated at full (110%) that is 33kV or 11kV or 440V.


Q). why only 10 % extra supplied by them...?...can it less or more?

A). You are absolutely correct, trans line drop is not just 10% but we cannot exactly say the voltage drop as they changes proportional to the current and current value is not constant. so our scientists took some decent number which is 10%. But recently, we are going for higher voltages through advanced FACTS devices (where voltage drops will be compensated) hence this 10% is not valid for 765kV and further.


Q). What about 400kV, 765kv transmission voltages?

A). trans line drop is not just 10% but we cannot exactly say the voltage drop as they changes proportional to the current and current value is not constant. so our scientists took some decent number which is 10%. But recently, we are going for higher voltages through advanced FACTS devices (where voltage drops will be compensated) hence this 10% is not valid for 765kV and further.


Q). how did u choose 10kv,20kv,30kv etc at the receiving end?

A). these voltages (10kV, 20kV, 30kV......) are chosen based on the transmission distance.


Q). Why not 44kV and 55kV voltage levels??

A). Yes we can make 44, 55, 77.... like that. But there is no point in having all levels of voltages for every transmission distance.
Earlier days 11, 22, 33, 66, 132, etc.. are considered based on the transmission distances and these levels are found satisfactory for different transmission distances.
We can’t keep on designing each voltage level (cost considerations)


Q). Why we r not generating and transmitting power in at the 1kv, 2kv

A). Earlier we don't have the concept of distributed generation system, so power stations are far away from the living places, hence to transmit power for such a long distance small voltages will not be efficient. We should go for as high voltages as possible but we can even generate direct 220kV also from generator (due to the insulation and other limitations of generator) hence we generate from 10kV to 25kV. But , now a days we do have a generating station with 1kV or 2kV in that range (distributed generation, wind, solar and etc)


Q). Reference for this answer

A). We referred many resources to get this, Main reference is “Electrical Power Systems” by S.L. Uppal #PiSquareAcademy #ThotakuraNSCSekhar

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