Solving Transformer Per Unit Questions

[pingpong1]

1. attached is the question i am trying to solve.

I do not know how to do per unit questions.




2. Part a) of the question ask to convert into per unit and then per phase equivalent circuit. I do not understand how to do it. Please guide.

Also, how to calculate the bus1?



3. I cannot attempt because I do not know how to... what etc the first step etc

 

[earlofwessex]

Hi Pingpong
does the book (or lecturer) provide you with an equivalent circuit model?

if i remember rightly, per unit means all the component values normalised, and per phase means only consider one phase of the power lines. its been a while since i studied that.