Fast and Perfect Damping Circuit for Ferroresonance Phenomena in Coupling Capacitor Voltage Transformers

Abstract

This article investigates the effect of a few types of ferroresonance suppression circuits on suppression of the phenomenon of ferroresonance in coupling capacitor voltage transformers. A novel technique is proposed for damping of dangerous overvoltages due to ferroresonance. In this technique, by using power electronic devices, a damping resistance is switched to the secondary side of the system transformer during dangerous oscillations. This technique leads to important cost and damping-time reductions when compared with conventional alternatives. Additional devices, such as surge arresters, may be added to improve the performance of the ferroresonance suppression circuit. The technique proposed in this article is a “novel but classic” technique. The prediction of ferroresonance is achieved by detailed modeling using a digital computer transient analysis program such as the EMTP/ATP.