Self-induction device for generating harmonics

A self-induction device capable of steep saturation when the instantaneous value of a current flowing therethrough goes beyond a given threshold value, comprising an annular magnetic core including a plurality of toroid coils of magnetic material, each of said toroid coils having the same radial width, two concentric tubes of insulating material, one of said tubes being at the inside and the other of said tubes being at the outside of said core, each second toroid coil having an internal diameter equal to the external diameter of the internal tube, each other second coil having an external diameter equal to the internal diameter of the external tube, insulating radial spacers inserted between said tubes for supporting said toroid coils and for defining a space through which flows a refrigerating fluid, said fluid flowing alternately along the external and internal sides of the toroid coils and through the space provided between the horizontal sides of said toroid coils by said spacers, at least one insulated conductor coil embracing said annular magnetic core, a tank enclosing said magnetic core and said conductor coil, said tank being provided with at least one input conduit for feeding said refrigerating fluid to said space and at least one output conduit for said fluid.