I think Lyledunn is right. I can't imagine there is a full year of knowledge in HV only. 2-3 years in HV will probably earn you a doctoral degree
Just guessing from what little I have seen.
For example, there is a basic course how to run a power grid at the school where I've studied. The book is a 100 or so pages and the course is four weeks. Not real weeks, university weeks
If you want something more specific, you need to look in the grid operators manual. The situation will be similar in the other fields like design of HV lines.