Hi folks.
Today morning one of mine friends asked the the question he faced in accenture interviews. I felt like like sharing that with you. So here it comes.
Why the operating frequency of India is 50 and of USA it is 60?
So, As India was ruled by British people, We just followed the way they had it. So we are working on 50 Hz. Believe it or not, the reason for USA to have 60 Hz is vendetta. How if you ask them, USA people are like - "If their vehicles go by left side then ours will go by right side.( This is why We people need driving lessons in USA) If their frequency is 50 then our will be 60" That's it!
Japan is a country that works on both 50 and 60.
Now you can ask me why 50 or 60 only, and why not 30 or 40.
The reason my friend is more related to mechanical engineering. Almost all of the electricity comes from coal fired, Gas fired or nuclear plants where we use steam turbines.
So the problem with these mechanical systems is they are not as efficient as our systems.
( no offense to any mechanical engineer reading) So They suggested us that our turbines, they operate optimally on speed range of 3000-3600 rpm. At such a high speed to counter with centrifugal force we need to reduce the diameter and so the no of poles on the rotor.
So if we put no of poles 2 and speed 3000 in the basic SM formula then we get 50 Hz as operating frequency. If we put 2 poles and 3500 then we get 60 Hz. That's why these 2 only.
Hydro generators have adjustable no of poles and speed range so they can cope up with both 50 and 60 systems.
This operating frequency has very huge impact on the design of the power system components. We will discuss it in coming posts.
Thank you for your time and please do comment about your areas of interest.
Today morning one of mine friends asked the the question he faced in accenture interviews. I felt like like sharing that with you. So here it comes.
Why the operating frequency of India is 50 and of USA it is 60?
So, As India was ruled by British people, We just followed the way they had it. So we are working on 50 Hz. Believe it or not, the reason for USA to have 60 Hz is vendetta. How if you ask them, USA people are like - "If their vehicles go by left side then ours will go by right side.( This is why We people need driving lessons in USA) If their frequency is 50 then our will be 60" That's it!
Japan is a country that works on both 50 and 60.
Now you can ask me why 50 or 60 only, and why not 30 or 40.
The reason my friend is more related to mechanical engineering. Almost all of the electricity comes from coal fired, Gas fired or nuclear plants where we use steam turbines.
So the problem with these mechanical systems is they are not as efficient as our systems.
( no offense to any mechanical engineer reading) So They suggested us that our turbines, they operate optimally on speed range of 3000-3600 rpm. At such a high speed to counter with centrifugal force we need to reduce the diameter and so the no of poles on the rotor.
So if we put no of poles 2 and speed 3000 in the basic SM formula then we get 50 Hz as operating frequency. If we put 2 poles and 3500 then we get 60 Hz. That's why these 2 only.
Hydro generators have adjustable no of poles and speed range so they can cope up with both 50 and 60 systems.
This operating frequency has very huge impact on the design of the power system components. We will discuss it in coming posts.
Thank you for your time and please do comment about your areas of interest.
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