Nonlinear reactors as protective elements for thyristor circuits

Control of rate of change of current and voltage in thyristor power circuits is provided in diverse ways according to the special features of the particular problem and the ingenuity of the designer. It is shown that the use of a nonlinear reactor in series with the thyristor provides advantages in some surge suppression networks, and a design technique is presented for these reactors. Characteristics of a basic damping circuit are presented in the form of non-dimensional design curves, and a relationship is established between the losses of a surge suppression network and the thyristor and capabilities.