How to test a pulse transformer which is used in the VFDs (inverters) ?

[Raza]

don't you think that the pulse transformer is also the part of the trigger generator ?

No it not a part of triggering generator but an interface between thyristor and the Generator, as if the Pulse transformer is not there even then the generator will keep on generating the pulses.

 

[FvM]

The pulse driver in post #20 has the transformer wired for flyback operation, triggering the thyristor on transistor switch-off. That's neither usual nor reasonable, I think.