Flyback pulse from forward transformer.

[miso156]

When inductor is disconnected from supply a huge negavive pulse is developed across with very sharp rising edge.

But does the same happen when disconnecting transformer?

I tried this, the voltage pulse is developed but rising edge is more flat. Is it ok or i am doing something wrong?

 

[D.A.(Tony)Stewart]

what is L*dI/dt? from load change? Can you measure ac current & phase? Impedance matters!