Star Delta Transformation

1. The problem statement, all variables and given/known data


2. Relevant equations


3. The attempt at a solution

a) the question is to transform star to delta ?

 

attempt:
90+90j for single delta ?

 

I was not guessing I just used the T to π converter supplied with course and added result to another ZΔ =(45+j45) doubling them given 90+90j

 

angle is changing ? on the other connection V ∠0 ∠-120 ∠-240 thank you for the interest.

 

attempt: ZΔ x ZΔ /ZΔ+ZΔ and then x3 ?

 

I have Y and Δ from the start. I transform Y to Δ and obtain 2 x Δ with ZΔ = 45 + j45 and to get single Δ after your hints I thought I need to combine each 2 impedances in parallel so ZΔ x ZΔ /ZΔ+ZΔ and I need to do that 3x ?

 

An thank you for the prompt reply

 

I will improve I promise.

 

So similar to b) with 2 x Y at 15+j15 and ZYx ZY/ ZY+ZY

 

Sorry. after Δ to Y transformation I have 15+j15 for each impedance 2xY and then combine each impedance ZYx ZY/ ZY+ZY as in a)

 

as per drawing??

 

now I am thinking what happens when I add 0 to it? I wonder if you have any hints...:)