Shunt resistors for reactors — II

Shunt resistors applied to current limiting reactors used on large electric power systems function to reduce voltages caused by reflections and oscillations, to provide an avenue of escape for bus disturbances, and to reduce the voltages across the reactors. To be suitable for this purpose, a resistor must have an inverse characteristic such that its resistance during short circuits is many times that during transient conditions. The material known to the trade as “thyrite” fulfills these requirements admirably. A method of calculating the effects of such a resistor, with results given in convenient curve form, is presented in this paper.