Why don't you go to your professor and tell him you have no idea how to proceed with a final year project in power transmission, etc.

We don't know you, he does, hopefully. At least he is in the same country, which you did not bother to identify.

Maybe he will pity you and help.

pls help to find a topic to design a project

This is becoming a very popular question.

Final year finally, well you have come a long way (hopefully) from your original question back in 2007 when you asked "why is the frequency of direct current zero?"

So, what are your interests (choosing a project on a topic you are interested in is generally a good idea)? It's a big field (I know I work in it), what would you like to do?

Also see the numerous previous threads on the subject on CR4.

try this website www.mylab.tk , u can search for engineering projects on the internet