1. The problem statement, all variables and given/known data I have to calculate first commutation process (t=0) and second commutation process (t1 = 2*τ) Both swithes are closing in the given time moment. 2. Relevant equations Form of second commutation process: 3. The attempt at a solution I have already calculated first commutation process: And also some important figures for second commutation process: But how to get final result of second commutation process? I have to use mesh current method and write 2 equations (loops with current IL1 and IL2 in the picture) and after that I have to calculate complicated system of differential equations or what?