It's possible to use a voltage transformer as a current transformer, as long as none of the ratings are exceeded. I've converted a couple of voltage transformers into current transformers. On the last one, I cut away the secondary windings, and replaced them with a single turn, which became the primary. The winding that had been the primary, and was now the secondary, had about 2000 turns, so for 12 A input , I got about 6 mA output, to light an LED. As the secondary had been rated to 230 V, and I was running it at around 3 V, the core was far from saturated. The transformer had been rated at about 6 W, so would have taken around 25 mA input current, so 6 mA on that winding wouldn't trouble it.