Handling transformers with high voltage values can cause high risks for "non-professionals". The European legislation, in fact, has limited the risks, reducing the value of the power supply voltage for the equipment that is handled daily by people who can be defined as "non-experts". How does all this translate for the transformer?
Previously we talked about the isolation transformer and its use; now, if we add a few small tricks to this transformer, we can get an isolation and safety transformer. Let’s see.
As anticipated, starting from the isolation transformer, we can obtain safety by acting on the transformation ratio; since there is a transformation ratio between the two windings, technically called “turns ratio”, by varying which we can modify the value of the output voltage until obtaining no-load voltage values ≤ 50 V a.c. (as required by the reference standard). This simple trick allows us to guarantee the safety of our transformer
And to think that the first transformer was invented by chance when, in 1831 Michael Faraday, an English physicist and chemist, was carrying out some experiments on the magnetic field and on the possibility that electric current passed through it: for his experiments, in fact, he wound separately two conducting wires on an iron ring, so that there were no points of contact between the two windings, and he connected the ends of one winding to a pile. In addition to making his greatest discovery, namely electromagnetic induction, he had unwittingly assembled a transformer which, alas, was not used for its current purpose until the patent obtained in 1882 by Lucien Gaulard and John Gibbs.